Senior Fullstack Software Engineer

Role Overview Sigma Computing is growing its engineering team in New York City. The Senior Fullstack Software Engineer will help shape how users explore and interact with data. This role focuses on building technology that makes data more accessible and intuitive for a broad audience. What You Will Do Work on complex problems to create interactive experience…

Join a Transformative Team at PalantirAt Palantir, we create cutting-edge software that empowers organizations to harness the power of data for impactful decision-making. Our innovative platforms help partners in various fields, from pharmaceuticals to public safety, make informed choices that lead to lifesaving outcomes and efficient operations.About the OpportunityIf you are driven by the pursuit of engineering excellence and have a passion for boosting the productivity of your fellow developers, this role is for you!As a Software Engineer specializing in Frontend Developer Productivity, you will collaborate within our Frontend Infrastructure team to identify, design, and implement strategies that enhance engineering velocity and elevate the quality of our software.Our team oversees the entire frontend development ecosystem, ensuring seamless integration from the developer experience in the IDE to the end-user experience in the browser. We are tasked with:• Developing and optimizing the build and CI systems for a large-scale frontend monorepo comprising millions of lines of code and supporting hundreds of active developers.• Creating essential infrastructure for frontend development, including feature flags, internationalization support, and commit previews.• Building a GraphQL API for efficient declarative data loading that integrates multiple underlying services.• Contributing to Blueprint, our open-source UI framework, utilized by Palantir applications and developers globally.• Developing various tools and VSCode extensions that enhance the developer experience across the organization.With an ambitious roadmap ahead, this role offers you the chance to significantly impact application development at Palantir.

At StubHub, we are on a transformative journey to elevate the live event experience globally. Whether it's a person's first ticket purchase or their hundredth, our mission is to provide enjoyment and satisfaction from the moment they start their search until they enter the venue. We also cater to our sellers, from fans listing a single ticket to promoters of major tours, ensuring StubHub is the safest and most convenient platform for millions of users worldwide.Join us as a Software Engineer II, where you will be instrumental in designing and developing cutting-edge technologies and intricate features. In this role, you will face significant challenges and contribute to innovative solutions that drive our success. We seek individuals with a proactive attitude and a passion for problem-solving. Your career here will involve diverse projects aligned with business needs, and we value versatility, a growth mindset, and enthusiasm for tackling new challenges. Location: Hybrid (3 days in office/2 days remote) – New York, NY About the Team: The Consumer Experience (CX) team is dedicated to enhancing the product experience for fans discovering, buying, and selling tickets through our web and mobile platforms. We are committed to fulfilling StubHub’s mission to be the leading global destination for live events by crafting engaging experiences for millions of fans daily. Our focus is on understanding user needs and delivering both short-term and long-term feature innovations that are effective and enjoyable. With operations in over 60 regions and 30 languages, we prioritize a personalized experience for every user. Our cross-functional team collaborates on product, design, engineering, and data, fostering a culture of innovation through diversity of thought and transparency.

About N1:N1 is an innovative blockchain network that is hyper-performant and horizontally scalable. Our mission is to facilitate trustless computing at the scale of the internet, revolutionizing the way digital interactions occur.Our talented team comprises individuals with diverse backgrounds from prestigious institutions such as Harvard, Carnegie Mellon University, DFINITY, VMWare, and Galaxy Digital. We are proud to be supported by leading investment firms like Founders Fund, Kraken Ventures, SALT, and Amber Group.Position Overview:We are excited to invite a Full-Stack Software Engineer Intern to join our dynamic engineering team. This full-time role will involve the development of robust front-end, server-side, and database applications, with a primary focus on blockchain technology. Ideal candidates should be detail-oriented, innovative, and possess a strong product mindset. You will take ownership of enhancing our web platforms and internal tools, ensuring they are user-friendly, secure, and high-performing.

About Sei LabsAt Sei Labs, we are pioneers in developing open-source technology for the high-performance Sei Blockchain, the first EVM Layer 1 blockchain designed for parallelization and industry-scale performance. Our unique optimizations enable Web3 applications to achieve Web2 levels of scalability and efficiency, fostering the widespread adoption of digital assets.Our talented teams are composed of industry veterans from leading companies like Google, Goldman Sachs, Robinhood, Nvidia, and Databricks, all dedicated to onboarding the next billion users into a thriving ecosystem of applications.Having raised over $30 million from prestigious investors such as Jump Crypto, Multicoin Capital, Coinbase Ventures, Distributed Global, Hudson River Trading, and Flow Traders, we are positioned for significant growth.Discover more about us on our website and explore our documentation.About the RoleSei Labs is on the lookout for a Fullstack Software Engineer to help redefine the future of Web3 by enabling innovative, impactful applications across the Sei Blockchain. In this role, you will collaborate with a team at the leading edge of blockchain technology, working closely with our ecosystem partners to develop state-of-the-art decentralized applications (dApps) that span various Web3 domains—from decentralized exchanges (DEXs) and gaming to decentralized physical infrastructure networks (DePin), artificial intelligence, and more. If you thrive in a fast-paced, community-oriented environment and are passionate about continuous learning and rapid development, this is an exceptional opportunity to expand the frontiers of decentralized technology.

Join Flex, a rapidly growing FinTech company headquartered in New York City, as we revolutionize the rent payment process. It's 2026, and we believe that paying rent should be affordable, flexible, and hassle-free. Our mission is to empower renters with the ability to pay their rent on a schedule that aligns with their financial needs. After establishing a strong foundation of investor support and a dedicated user base, we are seeking passionate individuals to join our team and help us drive our mission forward.As a Senior Fullstack Software Engineer, you will play a crucial role in propelling our company’s growth. Your expertise will be vital in developing and scaling our platform and application experiences, ultimately facilitating our ambitious goal of achieving 10x growth.

At StubHub, we are committed to revolutionizing the live event experience on a global scale. Whether it's a fan's first concert or their hundredth game, our goal is to provide an exceptional journey from ticket search to entry. This extends to our sellers as well; from individual fans to large promoters, we aim to make StubHub the premier platform for ticket transactions worldwide.We are in search of experienced Senior Software Engineers to create innovative technologies and intricate features that enhance how millions of users discover, engage with, and attend live events globally. As a Senior Software Engineer, you will play a key role in shaping our commercial and product strategies. Your focus will be balanced between understanding user needs and making astute commercial decisions. Our Senior Software Engineers are vital to our success, demonstrating initiative and enthusiasm in addressing challenges. At StubHub, we pride ourselves on being an exceptional and inclusive workplace. You will also act as a mentor and advocate for your team members, showcasing leadership qualities.Location: Hybrid (3 days in office/2 days remote) – Aliso Viejo, CA or New York, NY or Seattle, WAAbout the Team:The Supply team's mission is to streamline the experience for our large-ticket sellers by simplifying the onboarding and inventory management process throughout the entire event lifecycle. We empower sellers to minimize operational burdens and maximize revenue through intelligent automation and efficient workflows that operate at marketplace speed. Our infrastructure consists of enterprise-grade, high-throughput systems that support core seller operations and manage extensive, dynamic datasets. Our work encompasses multiple layers of the technology stack, from robust back-end services to high-performance, user-focused interfaces, ensuring that sellers have a reliable platform they can trust to manage their business.

Join WRITER: The Future of AI-Powered WorkAt WRITER, we're revolutionizing the workplace with our cutting-edge AI solutions. Our mission is to augment human capabilities through superintelligence, enabling seamless collaboration between IT and business teams to drive transformative outcomes. Our comprehensive platform empowers renowned organizations such as Mars, Marriott, Uber, and Vanguard to create and deploy AI agents powered by WRITER's enterprise-grade LLMs. With a valuation of $1.9B and support from top-tier investors like Premji Invest, Radical Ventures, and ICONIQ Growth, WRITER is solidifying its status as a frontrunner in the enterprise generative AI landscape.Founded in 2020, we have established offices in San Francisco, New York City, Austin, Chicago, and London. Our dynamic team is fueled by a passion for innovation, and we are eager to welcome talented builders and thinkers to help shape the future of work with AI. Position OverviewWe are looking for a talented fullstack Software Engineer to join our engineering team, focusing on the development of sophisticated AI-driven agent systems. These systems will autonomously execute workflows and manage complex tasks, significantly enhancing productivity across enterprise applications. As a key contributor, you will design, develop, and scale next-generation AI agents that integrate seamlessly with enterprise data and services to address real-world challenges. Collaboration with cross-functional teams will be essential in transforming intricate agent concepts into fully operational systems.‍ Key ResponsibilitiesArchitect, implement, and sustain scalable, secure agent-driven services and systems leveraging modern AI frameworks.Build and enhance robust infrastructure and high-throughput APIs, concentrating on critical agent capabilities such as memory management, communication protocols, skills, intelligent decision-making, security, and workflow oversight.Integrate agent functionalities with backend services, data repositories, vector databases, search/retrieval systems, and third-party APIs.Work closely with product managers, AI researchers, data engineers, and UX teams to convert high-level agent use cases into resilient, production-ready software.Ensure the reliability, monitoring, and observability of all agent components, including metrics, logging, CI/CD processes, and fault tolerance.Participate in architectural design discussions and conduct thorough code reviews to maintain high-quality standards.

About SomethingsAt Somethings, we are pioneering a revolutionary social wellness platform specifically designed for teens. Our mission is to create a supportive environment where young individuals can build meaningful relationships with mentors who truly understand them, are dedicated to their growth, and provide the guidance necessary for them to flourish.In the U.S., 25 million teens face mental health challenges, and each of the countless teens who engage with Somethings requires assistance. Our goal is to ensure that these individuals do not merely use the platform, but instead connect with compassionate humans who are devoted to their well-being and help them thrive.With backing from General Catalyst and esteemed healthcare and consumer investors, we are experiencing rapid growth — achieving a remarkable 1100% increase in 2025 and aiming for a fivefold growth in 2026.If you aspire to contribute to a transformative company within the mental health sector, we welcome you to join us.Role OverviewWe are seeking a Senior Fullstack Software Engineer specializing in React to join our dynamic, high-impact engineering team. You will play a pivotal role in constructing the foundational web experiences that empower our mentors and operational teams.This position offers high levels of agency, craftsmanship, and impact:You will directly influence the platform experiences that assist teens in connecting and genuinely improving their lives.What You'll DoIn this role, you will take complete ownership of essential projects that align with our strategic objectives for 2026:1. Transform our Mentor Operations Platform into a world-class experienceDeliver web experiences that are fast, reliable, and deeply human-centric.Evolve the mentor web experience from basic functionality to a cohesive, elegant, and leading-edge platform.Create user interfaces that are as intuitive and refined as the best consumer applications.Prioritize performance, accessibility, and interaction quality.2. Develop tools that safely scale our mentor operationsDesign features for mentors that enhance consistency, speed, and connection.Implement safety measures that proactively identify risks and minimize human error.Refine mentor workflows to empower users rather than overwhelm them.3. Take charge of full-stack product developmentBuild comprehensive features across React, backend services, and APIs.Engage in close collaboration with design, product, growth, and clinical operations teams.

Role Overview Sigma Computing builds a high-performance platform designed to make data accessible to a broad range of users. The engineering team is growing in New York City, NY, and is looking for a Senior Frontend Software Engineer to help shape the future of the product. This role works with a skilled group of engineers focused on delivering technology that simplifies complex data for businesses. What You Will Do Design and implement advanced, responsive user interfaces using modern front-end technologies. Take ownership of major product features, guiding them from initial concept through launch. Work closely with product managers, UX designers, and backend engineers to build features that improve usability for non-technical users. Apply front-end development expertise to create innovative data visualizations for both structured and unstructured data. Develop techniques that improve application performance and interactivity. Use frameworks and tools such as React, GraphQL, TypeScript, and Node.js in daily work.

Join AtrixAt Atrix, we empower medical affairs teams within pharmaceutical companies to navigate the overwhelming sea of unstructured data—from field notes taken by medical science liaisons to insights gleaned from conferences and post-market studies. Our mission is to ensure that valuable insights reach clinicians promptly and effectively, improving patient outcomes.We have built a robust platform that transforms disorganized data into actionable insights, collaborating with leading pharma companies and outperforming larger competitors by prioritizing customer needs and delivering innovative solutions.About UsWe are a dynamic, senior team with backgrounds from industry giants like Google, a16z, Plaid, and Kickstarter. As a seed-stage startup based in New York City, we are dedicated to building and scaling impactful products.Your RoleAs our fourth engineer and first dedicated frontend hire, you'll have a unique opportunity to shape the frontend landscape as we expand. You will develop responsive, server-rendered features using React and Next.js, enhance performance, and collaborate on Python services that power our applications.Your ResponsibilitiesLead the development of our Next.js application (SSR + SSG), with a focus on complex data tables and visual analytics handling large datasets.Make key decisions regarding frontend architecture and establish long-term technical strategies.Develop product analytics strategies and implement the necessary tools.Contribute to backend development using FastAPI as needed.Your Qualifications5+ years of experience with JavaScript/TypeScript, and at least 3 years of production experience with React.Proficiency with Redux Toolkit or a similar state management library.Experience with SCSS or CSS-in-JS, along with a solid understanding of accessibility standards (WCAG).At least 2 years of experience with Python in various contexts (scripts, CLI, data pipelines, etc.).Minimum of 2 years of backend development experience in any language.Preferred QualificationsFamiliarity with React Query or TanStack Query.Experience with virtualized grids or tables.

Why Join Harvey?At Harvey, we're revolutionizing the landscape of legal and professional services through comprehensive, end-to-end solutions. By harnessing cutting-edge AI technology, a robust enterprise platform, and unparalleled industry expertise, we're transforming the dynamics of essential knowledge work for years to come.This is a unique opportunity to contribute to a generational company at a significant turning point. With over 1000 clients across 58+ countries and robust backing from top-tier investors, we're experiencing rapid growth and establishing a new category in real-time. The challenges are ambitious, the standards are high, and the potential for personal, professional, and financial advancement is extraordinary.Our team consists of driven, intelligent, and deeply dedicated individuals. We thrive in a fast-paced environment, take genuine ownership of our projects, and prioritize collaboration with our clients — from leadership to engineering. If you excel in uncertain situations, strive for excellence, and are eager to shape the future of work alongside others who are equally passionate, we encourage you to join us in building something remarkable.At Harvey, we are writing the future of professional services today — and we’re just getting started.Position OverviewAs a Senior Frontend Software Engineer at Harvey, you will spearhead engineering initiatives that shape the user experience across our various products: Assistant, Vault, Workflows, and our integrations with Microsoft Word and Outlook. You will also guide frontend engineering for new products under development. Our team is comprised of highly skilled, motivated, and thoughtful engineers. Every aspect of our work — from design to architecture to code and communication — is held to the highest standards. If this resonates with you, this position could be the perfect fit.This role is based in New York, NY, and follows a hybrid in-person work model. We also provide relocation assistance for new hires.

About Us At Propel, we are dedicated to creating technology that enhances the social safety net. Our dynamic team of around 100 passionate individuals, known as Propellers, envisions a future where every American has access to the tools and resources required for success. The Role Are you a Fullstack Engineer eager to make a significant impact in a mission-driven environment? Do you excel in high-autonomy startup settings? If so, we want you on our engineering team at Propel. In this role, you will have the chance to switch between individual contributor and engineering management responsibilities! This position will allow you to work on various products and technology stacks, including engaging with government programs, identifying savings opportunities, facilitating user enrollment in healthcare plans, developing internal tools, and architectural design. We seek a passionate, user-focused Fullstack Engineer excited about tackling meaningful and complex technical challenges that positively influence our users’ lives. Your Impact: Strategically Lead Technical and Product Initiatives: You will play a vital role in identifying the best technical and product opportunities—whether building a new service from the ground up or advocating for significant improvements to a legacy system. Your voice will be instrumental in shaping the company’s technical and product direction, and you will take a hands-on approach to help realize these initiatives. Leading a team will also be part of your responsibilities. Set Engineering Standards: You will serve as a role model for your peers and establish best practices for technical decisions, code quality, documentation, and ensuring high-quality product delivery within timelines. Address Complex Challenges: When high-complexity tasks arise, you will be the go-to person for solutions. You will enjoy autonomy while receiving ample support to tackle these rewarding challenges!

About GeminiFounded in 2014 by Cameron and Tyler Winklevoss, Gemini is a pioneering global platform in cryptocurrency and Web3, dedicated to delivering a suite of user-friendly, secure, and dependable crypto solutions for both individuals and institutions in over 70 countries. Our mission is to usher in a new era of financial, creative, and personal freedom by granting trusted access to the decentralized future. We envision a world where cryptocurrencies redefine the global financial landscape, enhancing choice, independence, and opportunity for all. By bridging traditional finance with the burgeoning cryptoeconomy, we aim to create a more open, equitable, and secure financial system. As a publicly traded company, Gemini is uniquely positioned to amplify this vision with expanded scale and influence.The Trading Systems DepartmentThe Role: Staff Software Engineer (Frontend)As a Staff Frontend Engineer at Gemini, you will collaborate with a dynamic cross-functional team of web, mobile, and backend engineers to tackle complex challenges that will shape the future of the digital asset ecosystem. Your contributions will directly enhance our customer experience, setting us apart as a leader in the industry and helping to build an unparalleled crypto exchange. If you are passionate about solving technical challenges that impact our customers and clients, we invite you to connect with us.This position requires in-person attendance at our New York City office twice a week.

About N1:N1 is an innovative leader in blockchain technology, providing a hyper-efficient and horizontally scalable network that facilitates trustless computing on an internet-wide scale.Our diverse team hails from esteemed institutions such as Harvard, Carnegie Mellon University, DFINITY, VMWare, and Galaxy Digital, and is supported by elite venture capital firms including Founders Fund, Kraken Ventures, SALT, and Amber Group.Position Overview:We are in search of a talented frontend engineer who has a keen eye for design and a passion for creating exceptional, high-performance user experiences across our digital platforms. As a crucial member of our agile team, you will contribute to the development of blockchain products, directly influencing user interaction with our cutting-edge technology. This opportunity is perfect for individuals who are resourceful, deeply invested in product development, and possess strong design instincts.

Noise Labs develops a real-time marketplace where attention becomes a measurable and tradable asset. The platform serves individuals and organizations seeking clearer ways to quantify and exchange attention, aiming to redefine how relevance is tracked as digital trends evolve. The team operates from a SoHo office in New York City and numbers just 10 people. While based in NYC, the group welcomes remote collaboration for the right candidate. Role overview This Senior Frontend Software Engineer position calls for someone who writes clean, effective code and cares about design quality. The work centers on translating user needs into products that stand out for both usability and visual appeal. What you will do Build and refine frontend features for a platform focused on measuring and trading attention Work closely with a small team to deliver products that align with user needs Balance technical implementation with design considerations Requirements Strong frontend development skills Sensitivity to design and user experience Ability to collaborate in a small, agile team Comfort working from New York City or remotely

Vendelux empowers organizations to uncover the most impactful events. Event marketers play a crucial role in the success of businesses, generating leads and building exceptional brands throughout the year. At Vendelux, we strive to amplify the effectiveness of every event that a company sponsors or attends.As a Series A SaaS innovator, we serve as the definitive system of record for event marketing. Our cutting-edge software platform delivers proprietary insights, aiding high-growth companies in identifying the events, conferences, and trade shows that yield the highest return on investment. Our AI-driven platform is often described as a dream for event marketers.Founded in 2021, Vendelux recently secured a $14 million Series A funding round led by FirstMark, whose portfolio includes industry giants such as Shopify, Pinterest, Discord, Airbnb, Draft Kings, Carta, and Justworks. Our leadership team boasts alumni from prestigious firms like Bain, ZoomInfo, Shutterstock, Compass, ModernLoop, Forter, Zulily, and NewtonX.Data-driven marketers have numerous tools to optimize their digital advertising investment and confirm ad visibility. We create similar tools tailored for data-driven event marketers, who have traditionally faced limitations, such as merely scanning conference badges at booths.As we expand, we are in search of Staff Software Engineers to deliver critical features and implement key infrastructure enhancements. In this role, you will play a pivotal part in shaping the technical vision for our products and systems.This is a full-time position based in New York City. Our preference is for engineers to adopt a hybrid work model, with an expectation of four days in the office. You will report directly to our Head of Engineering.

About UsAt 3Y Health, we are revolutionizing the healthcare industry with our AI-driven software designed to alleviate the overwhelming administrative challenges that consume a staggering 40% of healthcare revenue. Our comprehensive platform empowers clinician entrepreneurs, enabling them to establish, manage, and expand their private practices effectively. By integrating cutting-edge AI and automation into independent practices, we help healthcare providers reclaim their time, foster flourishing businesses, and improve health outcomes within their communities. Backed by over $200 million in funding from prestigious investors such as Founders Fund, General Catalyst, Softbank, and 8VC, 3Y Health is positioned to make a significant impact in healthcare.About the RoleWe are on the lookout for a talented Fullstack Engineer who can help us design and develop intuitive, high-performance user interfaces that resonate with our providers. The perfect candidate is not only skilled in modern web development technologies (React, TypeScript, Node) but also possesses a strong aesthetic sense and an appreciation for quality user interactions. You prioritize clean, modular coding practices and thrive in collaborative environments, working closely with design and product teams to create elegant user experiences. Ideal candidates may have experience as a founding engineer or founder, demonstrating a proactive mindset, a focus on product excellence, and a commitment to continuous improvement.In this role, you will drive architectural decisions, work cross-functionally with engineering, design, and product teams, and take charge of delivering scalable systems while enhancing the user experience of our practice management platform.

P-1473 At Databricks, we are dedicated to empowering data teams to tackle the world's most challenging issues — whether that's bringing the next mode of transportation to life or accelerating groundbreaking medical advancements. Our mission is fulfilled through the creation and operation of the world's premier Data Intelligence Platform, enabling our clients to harness deep data insights to enhance their operations. Born from an engineering background and fueled by customer-centricity, we eagerly embrace every opportunity to confront technical challenges — from designing next-generation UI/UX for data interaction to scaling our services and infrastructure across millions of virtual machines. And this is just the beginning. As one of the pioneering fullstack engineers at our NYC Engineering office, you’ll join a dynamic team committed to innovating and building new products from the ground up. Our aim is to leverage the capabilities of Databricks in data and AI to deliver vertical AI applications tailored for both technical and business users. This role embodies a true 0-to-1 environment, blending the excitement of a startup with the resources of a tech powerhouse like Databricks. Your primary challenge will involve utilizing the latest UX/UI technologies to craft intuitive yet robust interfaces for complex data and workflows. Your team is adopting a UI-first and GenAI-first strategy in product development. You may work on challenges such as: Designing interfaces for GenAI agents capable of generating intricate workflows while ensuring human oversight through transparency and inspectability. Creating sophisticated visualizations, including data pipelines, data mappings, customer journey flows, identity graphs, and more. Establishing mechanisms that promote product-led growth through effortless onboarding and sharing functionalities. Fostering an interactive environment for collaborative data projects at scale with a seamless transition to production.

About UsAt Perchwell, we are revolutionizing the real estate industry with our innovative platform designed for agents to search more effectively, collaborate seamlessly, and expedite transactions. We are crafting the future of residential real estate’s vital listings infrastructure, merging market research with client collaboration. Our cutting-edge architecture allows for continuous enhancements that outpace traditional systems, featuring AI-driven functionalities and mobile-first designs that align with how agents work. As technology and consumer expectations evolve, Perchwell is dedicated to empowering real estate professionals through the most intelligent, data-centric, and interconnected platform available.Supported by prominent venture capital firms like Lux Capital and Founders Fund, along with strategic alliances with leading Multiple Listing Services (MLSs), Perchwell is pioneering a new era in the listings technology market. This unique blend of institutional investment and industry expertise equips us with the resources and validation necessary to transform the multi-trillion dollar residential real estate sector.Position OverviewWe are seeking a talented Senior Software Engineer specializing in Frontend development—a professional who is passionate about creating beautiful interfaces, designing robust architectures, and managing complex client-side states. This is a rare opportunity to take the lead in shaping our frontend codebase. Your extensive frontend engineering experience will be instrumental in building scalable, modular systems that excel in performance, testing, and maintainability. You will be responsible for our frontend infrastructure, encompassing development patterns, tooling, and build efficiency, enabling our team to work faster and with greater confidence.As the expert in frontend engineering best practices, you will closely collaborate with design and backend teams to establish API standards. This role is perfect for someone who has navigated through intricate frontend ecosystems and is eager to leverage those insights within a dynamic and ambitious team. If you are enthusiastic about frontend design, code architecture, and optimization, you will flourish here.Your Responsibilities:Lead the design and development of our next-gen frontend architectureCreate high-quality user interfaces that are fast, visually appealing, and accessibleDevelop complex yet comprehensible state management systemsEstablish and uphold frontend coding standards to ensure code quality and maintainability