Senior Backend Software Engineer | Flagler Health | NYC

About the Role:Parker is dedicated to a bold mission: empowering individuals to achieve financial independence. We believe that by providing independent business owners with essential financial tools, we can help them scale their operations profitably.Our flagship product merges a virtual corporate card with financial software designed for profitability, ena…

At Bubble, our mission is clear: we aim to empower everyone to create software. We believe that anyone with a transformative idea should have the means to bring it to life. Our AI-driven visual development platform allows individuals, from first-time entrepreneurs to established enterprise teams, to transform ideas into fully functional, scalable applications across web, iOS, and Android—all without the need for coding or managing complex workflows.As the sole full-stack, cross-device no-code platform, Bubble has garnered over 5 million users across more than 100 countries, breaking down barriers to entrepreneurship and innovation worldwide.Our Achievements:Our platform is thriving, with entire VC-backed companies being built solely using Bubble. After successfully finding product-market fit and eight years of bootstrapping, we secured a $100 million Series A funding round, establishing ourselves as one of the fastest-growing companies within the New York tech ecosystem. The potential of Bubble is demonstrated by our community—individuals are not just launching products; they are creating viable businesses. For instance, Mailead turned a $10k investment in a Bubble product into a $2M valuation, while Faceless.video achieved over $1M in annual recurring revenue within a year.About the Platform Team:Our Platform team is dedicated to enhancing our scaling, reliability, and enablement capabilities as we aim to double our customer base in the coming years. Our responsibilities encompass both scalable infrastructure and our core backend systems. Success in this role means delivering timely capacity, executing workloads rapidly, and guaranteeing data scalability across diverse applications while managing costs and addressing implementation and infrastructure inefficiencies.About the Role:Join a small, elite team tackling challenges faced by the largest cloud providers. This position is an opportunity to be at the forefront of a platform that is revolutionizing the traditional engineering stack globally. Additionally, you will contribute to fostering an inclusive, effective, and collaborative engineering culture. This role requires after-hours and on-call availability.

About AKASAAt AKASA, we are on a transformative journey to redefine healthcare through the power of artificial intelligence. As a trailblazer in generative AI solutions tailored for the healthcare revenue cycle, we empower health systems to accurately capture and relay the complete patient clinical journey. By enhancing operational efficiency, we enable these systems to prioritize what truly matters: delivering exceptional patient care. With over $205 million raised in funding from esteemed investors like Andreessen Horowitz, BOND, and Costanoa Ventures, our future is bright.Now is the most thrilling time to become part of AKASA. Since launching our innovative AI-native product suite in 2024, revenue bookings have surged over 20 times. We have set records by closing the largest deals in our company’s history three times in a row, driven by the substantial advancements we've made in clinical quality and documentation accuracy—two critical areas for health system leaders.Our implementations have garnered national attention, being recognized as "one of the most comprehensive real-world applications of GenAI in healthcare finance to date" (link). Our clientele represents over $120 billion in net patient revenue and includes pioneering health systems like Cleveland Clinic, Duke, Stanford, and Johns Hopkins.Recently, we have been honored with accolades such as being named the #1 most promising healthcare RCM startup of 2025 by Black Book Market Research and listed among the fastest-growing GenAI startups to watch by AIM Research. Our CEO has been recognized as one of the “Top 50 Healthcare Technology CEOs” by the Healthcare Technology Report, and we have proudly maintained our status as a “Great Place to Work” for five consecutive years.Join us as we build on this momentum to redefine the possibilities within healthcare. We seek exceptional talent to help accelerate this mission.About the RoleAs a Senior Backend Software Engineer, you will develop AI-driven solutions for our Clinical Documentation and Medical Coding suite. Collaborating closely with product, design, and machine learning teams, you will design and implement services, APIs, and tools that enhance our SaaS offerings. You will have the opportunity to work on groundbreaking projects that directly impact healthcare delivery.

About Pangram LabsAt Pangram Labs, we are dedicated to ensuring authenticity through the development of cutting-edge AI detection systems. Our team is at the forefront of research, creating algorithms and products that integrate our advanced technology into everyday life.We seek individuals who are proactive, mission-focused, and passionate about innovation to join our in-person team based in Brooklyn, New York.About the RoleWe are on the lookout for a Senior Software Engineer with a backend emphasis to design, implement, and scale our production systems, which support our core technology for a rapidly expanding user base.In this senior-level position, you will be responsible for the backend infrastructure that drives Pangram's AI detection platform. You will have the autonomy to make architectural decisions, tackle complex scaling challenges, and ensure that our systems remain reliable and efficient as user demand increases. Collaborating closely with our frontend and machine learning teams, you will work primarily with our Django backend and AWS infrastructure.What You'll DoDesign and develop scalable backend services and APIs to deliver AI detection features effectively.Ensure the reliability, performance, and observability of our production systems.Architect and manage data pipelines, caching layers, and service infrastructure using AWS.Collaborate with machine learning engineers to deploy and manage machine learning models in production.Identify and resolve performance bottlenecks as user traffic and system complexity increase.Establish and enhance engineering best practices related to testing, deployment, and incident management.

Noise Labs is building tools that blend diverse online data and market insights to help users navigate uncertain times. Based in SoHo, New York City, the team is small (10 people), collaborative, and values thoughtful design and high-quality engineering. Remote work is possible. What You’ll Do Develop backend systems that power consumer features such as feeds, ranking algorithms, notifications, real-time interactions, and social elements. Build and maintain a codebase that supports both developer and automated agent confidence. Own core product services, data flows, and APIs. Design infrastructure where speed and accuracy matter, especially for settlement, pricing, and real-time financial transactions. Improve the development environment, including CI, testing, and observability. Requirements Skilled in using AI tools to speed up development. Strong judgment for balancing latency and accuracy in financial systems. Deep experience with TypeScript, relational databases, real-time communications, and event-driven data flows in finance. Comfortable working in a strict monorepo setup with clear service boundaries and conventions. Ability to independently debug and improve the development pipeline. Clear communicator for async updates, incident reviews, and team problem-solving. Bonus Points Experience with Effect-TS. Side projects, open source work, or previous startup experience. Compensation and Benefits The minimum full-time salary ranges from $160,000 to $210,000, in compliance with New York City's Pay Transparency Law. Full-time employees at Noise Labs are also eligible for additional compensation, including equity and benefits, based on the specific role.

Join Centari - A Leader in Deal IntelligenceAt Centari, we are revolutionizing high-stakes dealmaking by unlocking the potential of private deal data. As we develop the future's deal intelligence platform for law and finance, we go beyond mere automation, embracing a data-driven approach to empower negotiation teams globally with strategic insights. Our proprietary Deal Reasoning Engine transforms complex documents into invaluable knowledge, ensuring our clients have the upper hand in negotiations.Our dynamic team consists of attorneys, financial experts, and engineers who thrive in a hybrid, cross-cultural environment. We are proud to be supported by leading enterprise AI investors, including GTMfund, former DoorDash board member Jeremy Kranz, Seamless co-founder Andy Appelbaum, Jack Altman, South Park Commons, and Recall Capital.We embrace complexity, as it is the breeding ground for innovation. If you are a builder who excels in ambiguity and embodies radical ownership, we want to connect with you.For further details, visit centari.com or follow us on LinkedIn.Role OverviewWe are seeking a Senior Backend Software Engineer to join our innovative product team. You will play a pivotal role in designing and developing Centari's core AI technology. Collaborating with fellow engineers who share a passion for action, you will write code, influence product direction, engage with clients, and drive projects from concept through to implementation.Our technology stack includes Go and React/TypeScript, utilizing state-of-the-art LLM technologies across our infrastructure, search, and persistence layers. If you have a passion for building impactful LLM applications and enjoy tackling complex challenges, we want to hear from you.

Join Flex, a dynamic and innovative FinTech company based in NYC, as a Senior Backend Software Engineer. In this pivotal role, you will be instrumental in architecting, developing, and scaling backend services and APIs that empower our groundbreaking rent payment platform. Collaborate with cross-functional teams to deliver resilient and efficient systems that enhance the renting experience for users and partners alike. You will oversee every aspect of the service lifecycle, from initial requirements gathering and system architecture to implementation, testing, deployment, and ongoing monitoring. Additionally, you will have the opportunity to mentor junior engineers and promote technical best practices within the team, fostering a culture of excellence and collaboration.

About UsAt Adaptive, we are a pioneering vertical AI company with a passionate team of 40 dedicated professionals, creating an AI-native ERP solution tailored for the real estate and construction industries. Our rapid growth has attracted over 600 clients and significant funding of $26 million from prestigious investors such as Emergence, a16z, and a host of angel investors from renowned firms including Brex, Ramp, Airbase, Square, and Shopify.Why You Should Be Part of UsEmpowering Local CommunitiesJoin us in serving the small businesses that are the backbone of our communities. The local coffee shop, the new residences sprouting up, and the ADUs addressing housing shortages are all projects driven by our clients—individuals who are deeply rooted in their neighborhoods and passionate about their work. These skilled artisans and builders are the creators of spaces that foster connection and memories.Collaborate with a World-Class Team in Vertical AIOur culture is steeped in collaboration, excellence, and shared experience. With a strong foundation in finance, technology, and construction, we are positioned to lead in a booming market. With your talents, we can continue to innovate and expand our impact.Your RoleWe are thrilled to invite a Senior Backend Software Engineer to join our dynamic team at Adaptive! Your expertise will play a crucial role in shaping our engineering initiatives and ensuring the delivery of high-caliber software solutions.Reporting to the VP of Engineering, you will collaborate closely with a dedicated engineering and product team of 15, significantly contributing to the architectural design, development, and optimization of our innovative products.Key ResponsibilitiesLead the execution and successful delivery of backend and infrastructure-focused projects in collaboration with the product and design teams.Ensure that backend systems are secure, scalable, resilient, and optimized for performance as we expand.Align technical solutions with business objectives and product vision.Facilitate technical discussions and decision-making processes to ensure alignment with overall company strategies.Demonstrate best practices by writing high-quality, maintainable, and robust code.

About the Senior Backend Software Engineer Role Sigma Computing builds a high-performance platform designed for modern data needs. The engineering team is growing in New York City, NY, and looking for experienced backend engineers who enjoy solving complex problems and improving how users interact with data. This group values practical solutions that make data more accessible for everyone. What You Will Do Tackle technical challenges that come with delivering an interactive data warehouse for exploration and analysis. Work with languages and tools including Rust, Go, GraphQL, Node, and Kubernetes to build and maintain reliable systems. Develop distributed backend services, algorithms, and APIs to support Sigma's cloud applications. Investigate and resolve product or system issues, using strong analytical and debugging skills. Design and implement new software features that support a rapidly expanding user base. Participate in design and code reviews with peers and stakeholders to maintain high technical standards.

About the RoleWe are seeking a highly skilled Senior or Staff-level Software Engineer to become part of our dynamic Backend Platform team.This team is dedicated to developing and maintaining Hex's foundational compute platform, which is the core engine behind all code execution, SQL querying, and data processing within the Hex application. Our platform supports everything from the essential notebook interface and published applications to the sophisticated data functionalities demanded by our AI agents.Our dual mission is to create a compute platform that is not only incredibly user-friendly and easy to develop on but also exceptionally fast and efficient. Engineers on this team thrive at the rewarding intersection of systems architecture, API design, and advanced performance optimization.What You Will DoAs a member of the Backend Platform team, you will engage in projects that involve high technical complexity across the entire stack, from our backend data systems to the frontend of Hex’s collaborative notebook interface.Here are some of the exciting projects you might work on:Leveraging DuckDB to facilitate seamless data interoperability between Python and SQL written by our users or AI agents.Creating intelligent caching systems to enhance customer data query performance.Implementing a graph-based dependency framework to optimize multi-step execution plans.Instrumenting complex, multi-language systems to identify and resolve performance bottlenecks.Developing visualizations for the product to assist users in understanding the performance characteristics of their code.About You6+ years of engineering experience with complex, data-driven systems or applications.Expertise in Python, SQL, Jupyter kernels, and/or data warehousing systems.Strong familiarity with industry trends in data processing, databases, and efficient data architectures.A passion for delving into intricate codebases and designing elegant abstractions that enhance correctness and developer productivity.A relentless desire to analyze and optimize every millisecond of performance.A strategic mindset that aligns with business and product goals while maintaining a balance between speed and engineering excellence.Experience working in a remote-first environment and possessing strong communication skills in that context.This position is fully remote anywhere within the US Eastern timezone, with the option to work from our NYC office.

Company OverviewTennr is revolutionizing the referral process in healthcare by ensuring that every patient referral is handled swiftly and efficiently. By utilizing our innovative RaeLM™ technology, we extract and manage patient information, enabling healthcare providers to capture more referrals, minimize denials, and significantly reduce delays.Position OverviewWe are on the lookout for a talented Senior Backend Engineer who is enthusiastic about systems architecture, data modeling, and large-scale workflow orchestration. This role involves designing and implementing features across our backend services to deliver exceptional customer value. You'll have the opportunity to design and optimize data schemas, build reliable backend services, and ensure smooth integration with third-party systems.Your expertise will play a vital role in high-volume workflow automation, focusing on developing and optimizing scalable data processing and machine learning infrastructure. This entails creating and maintaining complex workflows that utilize machine learning for automation, as well as leading performance optimization efforts to uphold best practices throughout the stack.Collaboration is essential—you will team up with sales and customer experience teams to integrate customer feedback and work alongside engineering colleagues to deliver robust solutions. We seek an individual who adopts a founder’s mindset, excels in systems-wide thinking, and takes the initiative to drive projects from concept to completion.The ideal candidate will possess profound experience in backend architecture, event-driven systems, and orchestration frameworks, and have a proven track record of building production-ready systems. You will be instrumental in shaping the technical foundation of our platform to ensure reliability, scalability, and adaptability as we grow.

At Highlight, we're creating a revolutionary shared intelligence layer tailored for today’s dynamic workforce. Our platform integrates context across all team members and tools, effectively dismantling information barriers. It adapts to your organization, intelligently routing knowledge and consistently automating workflows.About the PositionWe are in search of a Senior Backend Software Engineer to be responsible for essential backend infrastructure, including systems for team management, permissions, and integration-driven workflows. Your primary focus will be to enhance and scale our systems with a strong emphasis on performance, reliability, and an exceptional user experience.This role is perfect for an individual passionate about the convergence of desktop software, native development, and AI integration, and who thrives in a collaborative, fast-paced environment.Please note: This position requires on-site presence at our New York City office five days a week.Key ResponsibilitiesDevelop backend systems that facilitate product expansion, including multi-tenant architectures, permissions, and internal/admin tools.Design and manage asynchronous processing systems for background tasks and workflow orchestration.Optimize system performance and cost through practical techniques such as caching, batching, and efficient data access patterns.Create secure and extensible integration frameworks, including authentication mechanisms, APIs, and third-party connectors.Enhance backend engineering standards through observability, rigorous testing, incident preparedness, and operational best practices.Collaborate across departments to deliver features from inception to deployment while designing durable, extendable, and easily adjustable backend systems.Candidate ProfileWe are looking for someone eager to shape the AI-driven user experience of the future. We value extreme ownership, accountability, and initiative.This role is ideal for individuals who enjoy building scalable systems and enhancing observability while minimizing costs through practical optimizations such as caching, batching, and queue-based processing. You will work closely with product and machine learning teams to ensure Highlight remains reliable and high-performing as we scale.

CVector is dedicated to revolutionizing economic optimization and AI-driven predictions across energy and manufacturing sectors.Our technology seamlessly integrates critical decision-making factors that impact cost, reliability, and profit margins, providing a unified decision layer that forecasts future scenarios, simulates potential outcomes, and optimizes operational strategies. This allows industrial plants to operate closer to their maximum economic potential daily.This position requires in-office attendance at our New York City headquarters four days a week. CVector serves clients nationwide and operates in challenging industrial environments.Role OverviewAs a Senior Software Engineer specializing in Backend and AI Infrastructure, you will be instrumental in advancing CVector’s backend platform. Your focus will be on developing time-series data systems, AI-enhanced analytics, cloud infrastructure, and data ingestion pipelines that underpin our client-facing applications and internal modeling tools.This role is ideal for engineers who thrive on working closely with data and infrastructure, possess excellent architectural judgment, and are eager to engage with AI systems, databases, and distributed backend services. You will take ownership of complex systems, lead significant technical migrations, and influence the integration of intelligence into industrial energy workflows.You will work in close collaboration with product, modeling, and frontend engineers, significantly impacting the platform's direction, reliability, and scalability for the long term.Key ResponsibilitiesAs a Senior Software Engineer, your contributions will span various interconnected domains:Intelligent SystemsTranslate customer domains and operational workflows into effective prompts and AI system interfaces.Design, implement, and refine evaluations for AI outputs.Incorporate customer feedback and reinforcement signals to enhance system performance.Optimize context selection, retrieval, and trace collection to elevate output quality.Fine-tune smaller models using collected traces to enhance speed while maintaining performance standards.Evaluate and assimilate new AI platforms and models as they emerge.Support the training and deployment of large, time-series-specific models.Backend Platform and Data InfrastructureOversee migrations and enhancements of our time-series data schemas and storage systems.Update and manage PostgreSQL and associated database infrastructure.Develop and sustain data connectors for industrial and external systems.Lead improvements to MQTT-based data ingestion pipelines.Transition PostgREST to a GraphQL-based framework and evolve our API architecture.

Company OverviewAt Tennr, we are revolutionizing the referral process in healthcare. When patients receive a referral from their doctors, the wait can often feel endless—sometimes lasting days, weeks, or even months. This delay is largely due to the overwhelming volume of referrals and the cumbersome manual processes that can hinder timely action. With our innovative technology powered by RaeLM™, Tennr ensures that every referral reaches its destination swiftly and accurately, with all necessary information in hand. We empower providers to capture more referrals, minimize denials, and eliminate waiting times.Role OverviewWe are on the lookout for a dedicated Backend Software Engineer who specializes in systems architecture, data modeling, and large-scale workflow orchestration. In this pivotal role, you will architect and implement features across our backend services and infrastructure, delivering significant value to our customers. Your responsibilities will include designing and optimizing data schemas, developing resilient backend services, and ensuring seamless integration with third-party systems.You will spearhead initiatives focused on high-volume workflow automation, emphasizing the creation and optimization of scalable data processing and machine learning infrastructure. This encompasses the design and maintenance of complex workflows that harness ML for automation, alongside performance optimization efforts to guarantee scalability and reliability throughout the stack.Collaboration is essential in this role. You will work closely with our sales and customer experience teams to incorporate valuable customer feedback, and partner with engineering colleagues to bring robust solutions to life. We are seeking someone who embodies a founder's mindset, excels in systems-wide thinking, and proactively drives projects from inception to completion.The ideal candidate will have substantial experience with backend architecture, event-driven systems, and orchestration frameworks, showcasing a proven history of developing production-ready systems. You will play a crucial role in shaping the technical foundation of our platform, ensuring its reliability, scalability, and adaptability as we continue to grow.

At Mirage, we are pioneering an AI-driven video platform that revolutionizes the production and editing process through natural language. Our innovative models harness contextual intelligence to replicate the creative decisions made by professional editors, thereby significantly enhancing productivity for experienced teams while democratizing video creation for all.Join our interdisciplinary team as we confront some of the most complex technical and creative challenges in generative media. As an early member of our team, your contributions will address foundational issues that remain largely unresolved in the industry, allowing you to make a substantial impact on the future of creative expression.Learn more about usProduct (Captions by Mirage) Research (Seeing Voices, technical-white-paper)Updates (Follow us on X / Twitter)TechCrunch, Forbes AI 50, Fast Company (press releases)Our Esteemed InvestorsWe are privileged to have the support of top-tier investors and visionary entrepreneurs, including Index Ventures, Kleiner Perkins, Sequoia Capital, Andreessen Horowitz, and many others.Please note that all roles require in-person attendance at our NYC headquarters located in Union Square.Role OverviewAs a Backend Software Engineer at Mirage, you will have the opportunity to engage in diverse areas including product development, platform engineering, and machine learning. You will be responsible for building and managing the systems, services, APIs, and machine learning pipelines that drive our product offerings. Collaborating closely with product, design, client, and AI teams, you will take ownership of critical backend systems from conception to completion, transforming ambitious ideas into robust and scalable production solutions.

Join Grow Therapy as a Backend Software Engineer, where you'll play a pivotal role in developing our cutting-edge software solutions. Collaborate with a talented team to enhance our platform's functionality and performance, ensuring a seamless experience for our users.

OverviewJoin our dynamic team as a Senior Backend Engineer where you will architect, develop, and scale essential backend systems that support high-traffic consumer applications and internal platforms. You will take ownership of vital services and APIs, engage with high-throughput distributed architectures, and collaborate closely with product, machine learning, and engineering teams to deliver seamless, low-latency experiences for our users.About PhiaPhia has successfully secured $43M in funding from top-tier investors including Notable Capital, Khosla Ventures, and Kleiner Perkins to develop the AI alignment layer for the commerce sector. In less than a year, Phia’s consumer shopping assistant has amassed over one million users and established partnerships with over 6,200 retail brands, generating billions in annual gross merchandise volume. Each month, Phia contributes millions in sales for its partners and has achieved an impressive 11× revenue growth since its inception.As AI-driven vertical agents revolutionize various industries, Phia is at the forefront of transforming commerce from a fragmented and impersonal experience into a more intelligent, trustworthy, and user-centric journey. This trust serves as our competitive edge, positioning us as the comprehensive shopping destination for the next generation of consumers.Phia fosters a lean, high-ownership culture with a startup mentality. If you are eager to work in a fast-paced environment and tackle complex challenges within consumer AI and commerce, we invite you to join us.

Company OverviewAt tennr, we are revolutionizing the referral process in healthcare. When you visit a doctor and receive a referral to a specialist, the waiting game begins. Unfortunately, patients often face delays that can last days, weeks, or even months due to overwhelmed specialists and the cumbersome manual processes involved. Our cutting-edge platform eliminates these bottlenecks by ensuring that every referral is processed promptly and accurately, allowing healthcare providers to enhance their service delivery. Powered by RaeLM™, our sophisticated technology reads, extracts, and acts on comprehensive patient information, enabling providers to capture more referrals, minimize denials, and streamline service times.Position OverviewWe are on the lookout for a Senior Backend Software Engineer who is passionate about systems architecture, data modeling, and large-scale workflow orchestration. In this dynamic role, you will be responsible for designing and implementing features end-to-end within our backend services and infrastructure, ensuring they provide direct value to our customers. Your expertise will contribute to the optimization of data schemas, the construction of resilient backend services, and the seamless integration of third-party systems.You will spearhead initiatives focused on high-volume workflow automation while emphasizing the development and enhancement of scalable data processing and machine learning infrastructure. This role entails designing and maintaining intricate workflows that harness machine learning to drive automation, alongside leading performance optimization efforts to guarantee reliability, scalability, and adherence to best practices across the technology stack.Collaboration is at the heart of our operations; you will closely partner with sales and customer experience teams to integrate customer feedback, while also working hand-in-hand with engineering colleagues to bring robust solutions to fruition. We seek an individual who embodies a founder’s mindset, excels in systems-wide thinking, and is proactive in driving projects from inception to completion.The ideal candidate will possess a rich background in backend architecture, event-driven systems, and orchestration frameworks, coupled with a demonstrable history of building production-ready systems. You will play a pivotal role in shaping the technical foundation of our platform, ensuring that it remains reliable, scalable, and adaptable as we grow.

At Squarespace, we are transforming the way individuals realize their visions online. Our Research and Development Engineering teams are central to this mission, crafting seamless and powerful experiences that our customers depend on daily. As a Senior Backend Engineer, you will join a collaborative and high-impact team dedicated to developing scalable and reliable systems behind some of the web's most intuitive tools. Whether you bring three years or two decades of experience, if you are driven by a passion for designing elegant solutions, we invite you to connect with us. This is a hybrid position, requiring three days per week in our NYC office, reporting directly to the Engineering Team Manager. We are actively hiring across multiple significant R&D teams. Based on your expertise and interests, you may have the opportunity to join one of the following: Identity and Access Management (IAM) - responsible for developing and maintaining the fundamental systems that ensure secure access across our platform for both customers and internal teams, focusing on core functionalities such as authentication, authorization, and session management. Communications Platform - provides tools and services that facilitate effortless communication between our product teams and customers at scale. Our goal is to create user-friendly and impactful platforms. This role is high-visibility and high-impact as our work is utilized by a majority of product teams. Your Responsibilities Include: Developing scalable backend services using Java and related technologies. Writing clean, efficient code that supports high-traffic, production-ready systems. Contributing to design decisions and taking part in architectural discussions. Collaborating with engineers, designers, and product managers. Creating features from initial concept through to implementation and launch.