Staff Backend Engineer, Recommender Systems

About TrafileaTrafilea is an innovative Consumer Tech Platform dedicated to fostering transformative brand growth. We are developing an advanced AI Growth Engine that will propel the next generation of consumer brands.With over $1 billion in cumulative revenue, more than 12 million satisfied customers, and a talented workforce of over 500 professionals acros…

Canonical, a trailblazer in open-source software solutions, is looking for a Senior Software Engineer to join our Launchpad team. In this pivotal role, you will drive the evolution of our platform, which is essential for managing open-source projects. Your deep knowledge of Linux, web services, and scalable systems will allow you to refine a mature, Python-based architecture that supports major initiatives like Ubuntu. Collaborating with a global team, you will work on enhancing developer workflows and maintaining critical services, ensuring that Launchpad remains a dynamic environment for open-source contributions. This is an exciting opportunity to make a significant impact in the world of software development.

Join Raya as a Senior Backend Engineer, where your passion for backend engineering will be recognized and valued! We are looking for an experienced professional excited to work within a Node.js environment. The ideal candidate will possess over 6 years of progressive experience, showcasing both results and leadership capabilities in their previous roles. This is a pivotal moment for our backend team as we navigate through a phase of significant growth.At Raya, we believe in fostering a culture of learning and collaboration, empowering our team members to lead solutions to challenging problems and evolve into their best selves. You will play a crucial role in supporting our backend initiatives in messaging, connectivity, and location-based mapping projects. A successful candidate will demonstrate diligence in designing scalable software architecture and embrace Raya’s vision of enhancing lives through meaningful, in-person connections.We offer a robust benefits package that includes comprehensive medical and dental coverage, a daily food delivery allowance of $50, equity-based compensation, a vibrant company culture, ample learning opportunities, unlimited vacation, 12 weeks of paid parental leave, and an annual $1,000 travel stipend for personal growth and exploration, reflecting our core values of human connection, empathy, and curiosity.

At Acorns, we are dedicated to supporting the financial well-being of aspiring individuals through innovative micro-investing solutions. Our core values shape our approach to achieving this mission. We lead with heart, making bold decisions, building trust, embracing growth, and finding ways to overcome challenges. We invite you to join us in our commitment to enhancing financial wellness for families everywhere. As a Senior Backend Software Engineer at Acorns, you will play a pivotal role in developing and scaling our essential investment products. This position goes beyond mere execution; you will ensure the technical integrity and evolution of our systems, impacting millions of customers as they build their wealth over time. You will face complex technical challenges, mentor junior engineers, and maintain robust backend infrastructure as we broaden our financial wellness offerings. Our remote-first culture provides you with the flexibility to work from anywhere, with optional access to our office in Irvine, CA.

Why Clipboard Exists:At Clipboard, our mission is to empower individuals to ascend the socioeconomic ladder by transforming their extra time and ambition into meaningful career growth and financial opportunities. Our innovative app-based marketplace connects professionals with workplaces, enabling on-demand shift bookings that benefit both parties.About Clipboard:Clipboard is a rapidly expanding Series C company recognized as a leader in the Long Term Care sector, with plans to diversify into additional areas such as Dental Offices and Schools. As a YC Top Company, our global team of over 700 professionals operates remotely, having achieved profitability since 2022. We facilitate millions of shifts annually across the U.S., serving tens of thousands of professionals. Join us in our mission to further expand our impact. Learn more about our vision on our website here.Your Mission: Innovate, Execute, and Deliver ImpactAs a Backend Software Engineer at Clipboard, you will go beyond writing code—you will design solutions that redefine the connection between healthcare professionals and facilities. Collaborating with product managers, designers, and fellow engineers, you will develop impactful features that address real-world challenges. This is a dynamic and ongoing recruitment effort, as we consistently seek talented software engineers to join our growing team.What You’ll Do: Own the Code, Shape the FutureDeliver High-Quality, Scalable CodeCraft performant backend services utilizing Node/NestJS alongside responsive frontend features using React and TypeScript.Utilize MongoDB, Postgres, and Redis to maintain data integrity and optimize performance at scale.Develop Reusable Components and UtilitiesContribute clean, modular code for our web and mobile applications (Ionic/React, Dart/Flutter).Collaborate with the Developer Experience (DevX) team to enhance tools and libraries that increase productivity and streamline workflows.

About Us: At RelayProtocol, we are a pioneering Series A startup in the crypto space, dedicated to crafting innovative developer tools that facilitate token trading. Our vision is to empower developers in creating next-generation crypto applications by simplifying token integration and enhancing crypto commerce. We proudly support a myriad of crypto enterprises, including industry leaders like Magic Eden and Coinbase, across diverse sectors such as gaming, social interaction, and payments. Our team comprises deeply technical experts proficient in blockchain indexing, protocol design, and cross-chain interoperability. We are on the lookout for a driven Senior Backend Engineer to join our close-knit yet expanding team.Role Overview: We invite a highly skilled and seasoned Senior Backend Engineer with a robust foundation in crypto and/or financial technologies to elevate our team. In this pivotal role, you will be responsible for the design, development, and maintenance of the backend infrastructure for our cross-chain relayer product, ensuring its reliability and performance.Key Responsibilities:Backend Development: Architect, implement, and sustain highly scalable and resilient backend systems tailored for our cross-chain relayer. Optimize performance and responsiveness for large-scale data processing.Crypto Integrations: Engineer and uphold seamless integrations with various blockchain networks and crypto protocols, enhancing our platform's interoperability.

About the RoleWe are seeking an experienced and motivated Senior Backend Engineer (generalist) with a robust background in Java and preferably Kotlin to join our dynamic team. In this remote position, you will play a pivotal role in developing our product from the ground up. Your responsibilities will include integrating with enterprise systems, scraping and analyzing large datasets, and creating systems that empower users to utilize LLMs for generating scalable sales insights—extracting critical information from millions of public documents.You could be the ideal candidate if you: Are an accomplished developer with experience in Enterprise B2B SaaS or Big Data processing within the JVM ecosystem, with Kotlin as a plus.Have a history of impactful engineering experience in a startup or smaller organization.Are enthusiastic about engaging in all aspects of backend development and have experience collaborating within small teams in fast-paced startup environments.Possess familiarity with the following technologies: Kotlin (Backend)Google Cloud Platform (GCP)Google Cloud SQL for PostgreSQLFirebasePythonHave experience with any of the following (not mandatory):Natural Language GenerationEnterprise API integrationsPrompt EngineeringLarge Scale Web Scraping & ParsingAre proficient in both written and spoken English.Our Work CultureCustomer-Centric Approach - We pride ourselves on putting customers at the heart of everything we do.Rapid Execution - We operate with a sense of urgency and decisiveness, always striving to gain momentum.Joy in the Journey - We intentionally create an environment that is both energizing and enjoyable, fostering camaraderie and resilience within our teams.Hands-On Engagement - We believe that the best ideas emerge from close engagement with our work, embracing challenges and complexities.

Please note: This position is FULLY remote, but applicants must reside within the European region to effectively collaborate with our team, peers, and internal stakeholders. We welcome applications from anywhere in Europe, but please ensure you are physically located within this region.Hostaway is a leading SaaS scale-up revolutionizing the vacation rental industry. We provide innovative solutions and maintain strategic partnerships with industry giants like Airbnb, VRBO, and Booking.com, allowing us to effectively compete and thrive. Our customer-centric values drive consistent results that foster growth, learning, and innovation for our team and clients.As a profitable, high-growth company, we are proud to be the first unicorn in the short-term rental Property Management System sector . Join us during this exciting phase of our journey! Discover more about our recent achievements and valuation here.About the Role:Hostaway is on the lookout for a dynamic and driven Staff Backend Engineer to join our Core team. This team is crucial for integrating with our primary partners (Online Travel Agencies). These integrations are vital to our customers’ daily operations, enabling seamless connectivity between their properties and major booking platforms. If you have experience working with similar tools that manage large volumes of data and interact with complex APIs, you will be an excellent addition to our team! As a Staff Engineer, you will lead the technical evolution of your domain, ensuring a comprehensive understanding of architectural challenges and strategies for resolution over time.Collaboration with the domain’s Product Manager is essential. While the PM focuses on the what, you will be their counterpart responsible for determining the how. Your ability to delve deep into the technical aspects will be invaluable.

Join Our Mission-Driven TeamAt Great Minds, we are a dynamic and rapidly growing organization established by educators in 2007. As a for-profit Public Benefit Corporation, we are committed to ensuring that every student has access to meaningful and challenging educational content. We also believe that teachers deserve effective and intuitive tools designed for the realities of modern classrooms.Our team develops high-quality, research-based curricula in math, science, and English Language Arts (ELA) that are crafted in collaboration with educators. Our materials are tailored to meet real classroom needs and are focused on achieving sustainable student outcomes.Our Innovative ProductsOur renowned products—Eureka Math, Wit & Wisdom, PhD Science, Geodes, and the recently introduced Arts & Letters ELA—are trusted by thousands of schools and districts across the nation.Eureka Math is the leading math curriculum in the U.S., balancing conceptual understanding, procedural fluency, and real-world application.Wit & Wisdom® and Arts & Letters ELA™ anchor our reading strategies with content-rich, grade-specific instruction that integrates literature, history, and the arts, all grounded in reading science. Geodes® enhances our reading suite with decodable texts that connect phonics and meaningful content to promote early literacy.PhD Science is a hands-on K-5 science program that ignites curiosity and fosters a lasting understanding of scientific concepts.Our programs reflect a shared commitment to high expectations, joyful rigor, and deep respect for both educators and students.Our Vision for the FutureGreat Minds is entering an exciting new phase of growth and product maturity. We are dedicated to creating more interconnected, customer-focused experiences throughout the entire educator journey—from curriculum development to professional learning and comprehensive support.Our long-term goal is to become a true partner in educational impact, not just by delivering curriculum, but by supporting educators in achieving significant outcomes at scale.Job PurposeA Senior Staff Engineer will lead...

Whippy is at the forefront of revolutionizing business communication through AI technology. Our innovative AI Agents are transforming the way companies interact with their customers, providing solutions across customer support, marketing, and sales. By leveraging Whippy’s Voice AI and Chat AI, businesses can automate manual workflows, effectively manage inquiries, nurture leads, screen applicants, and streamline high-value engagements at scale. Our all-in-one platform replaces outdated tools with a powerful solution that enhances productivity and efficiency.About the RoleJoin Whippy as a Backend Engineer and play a crucial role in our product development.You will:Design and implement highly scalable APIs for quick deployment of new products and services.Draft Engineering Requirement Documents to guide projects from concept to execution, ensuring thorough evaluation.Develop test suites to uphold product performance and reliability, integrating analytics to track the success of launched features.Our backend engineers have successfully built:A robust Public API and webhook interface handling millions of messages.An advanced query language built on top of Postgres and OpenSearch.A production-ready URL shortening service with custom domain capabilities.About YouYou possess a strong understanding of web API architecture and a commitment to producing high-quality, well-documented APIs.You are eager to engage in the entire project lifecycle, from initial research and planning through to implementation and performance monitoring.Your excellent written and verbal communication skills enable you to convey ideas, designs, and potential solutions effectively, primarily in an asynchronous environment.What We OfferWe offer a competitive compensation package ranging from $60K to $80K annually, commensurate with experience.You will have the opportunity to take significant responsibility and ownership of a groundbreaking product.Collaborate closely with experienced entrepreneurs who have successfully built companies valued over $100M.Important InformationAs a startup, our team dynamics are unique compared to larger organizations. We are a globally distributed team, and this structure fosters a distinct collaborative culture.

About RemoteAt Remote, we are addressing one of the most significant challenges modern organizations face—navigating global employment with compliance and ease. Our platform empowers businesses of all sizes to recruit, compensate, and manage international teams seamlessly. Emphasizing our core values and forward-thinking culture, our team is dedicated to tackling ambitious challenges asynchronously across the globe. Our diverse workforce spans six continents (Antarctica is the last frontier!), and every role is fully remote.Innovation is at the heart of our operations, driving us to integrate Automation and AI capabilities into every position.We invite every member of the Remote team to contribute their unique talents, experiences, and cultural insights to help us create a world-class HR platform. If you are energetic, inquisitive, driven, and ambitious, join us in shaping the future of work! Apply today!The PositionYou will collaborate with a team of engineers across Frontend, Backend, SRE, and QA. Our structure includes cross-functional development teams dedicated to specific verticals.This role is available across various teams, and we will determine the specific team during the interview process based on business needs and your preferences.Regardless of the team assignment, you will focus on developing tools, APIs, and integrations for our product offerings.Our backend technology stack includes Elixir and Phoenix, paired with a Postgres database. For the frontend, we utilize React and Next.js. We rely on GitLab for version control, issue tracking, and CI/CD solutions. Our applications are hosted on AWS, and we practice continuous integration for multiple daily deployments.What This Role Offers YouEngaging and impactful challenges—your solutions will enable individuals and businesses to operate globally.A chance to make a significant impact—being in the early stages of our company means your contributions will resonate as we grow.

About RemoteRemote is tackling one of the most pressing challenges for modern organizations – navigating global employment compliance effortlessly. We empower businesses of all sizes to hire, compensate, and manage global teams seamlessly. Guided by our core values and a forward-thinking work culture, our team is dedicated to solving ambitious problems asynchronously from around the globe. You can find Remoters working from six continents (Antarctica is the final frontier!), and all of our job openings are fully remote.Innovation is at the heart of our values, and we have integrated Automation and AI capabilities into the requirements for every role.We invite every member of the Remote team to contribute their unique talents, experiences, and cultures to help us create a best-in-class HR platform. If you are dynamic, inquisitive, driven, and ambitious, we encourage you to join us and shape the future of work! Apply today!The RoleYou will be part of a diverse team of engineers specializing in Frontend, Backend, SRE, and QA, organized into cross-functional development teams focused on specific verticals.This position is available for multiple teams, and we will determine the exact team you will join during the interview process based on business requirements and your preferences.Regardless of the specific team, you will be responsible for developing tools, APIs, and integrations for one of our products.Our backend technology stack includes Elixir and Phoenix, supported by a Postgres database. We utilize React and Next.js for our frontend development. GitLab serves as our version control and CI/CD tool, while our applications are hosted on AWS. We rely on continuous integration for our deployments, allowing multiple deployments each day. You can explore our Engineering Rulebook for further insights.What You Can Expect from This RoleEngaging and meaningful challenges that empower individuals and businesses to operate globally.An opportunity to significantly influence our business as we are still early in our journey, meaning your contributions will have a lasting impact as the company grows.A great deal of flexibility in your work environment.

Join Checkly as a Senior Backend Engineer and become an integral part of our innovative team. We are looking for an individual who is passionate about crafting scalable and efficient backend systems. This role offers the flexibility of remote work, allowing you to collaborate with talented professionals across different time zones (UTC-3 to UTC+3).As a Senior Backend Engineer, you will design, implement, and maintain robust backend services that power our platforms. You will work closely with other engineers, product managers, and designers to deliver high-quality software solutions.

Remote builds a platform that helps organizations manage global employment, making it easier for businesses to recruit, pay, and oversee international teams. The company’s fully remote structure brings together team members from six continents, each contributing unique perspectives to the ongoing development of Remote’s HR platform. Automation and AI are woven into daily work, supporting efficient and compliant operations. Role overview The Senior Backend Engineer joins a cross-functional group that includes Frontend, Backend, SRE, and QA specialists. Teams are organized by product vertical, and the specific assignment will be determined during the interview process based on both business needs and personal interests. The main focus of this role is building tools, APIs, and integrations for one of Remote’s core products. Key technologies Elixir and Phoenix for backend development Postgres as the primary database React and Next.js on the frontend GitLab for version control and CI/CD AWS for hosting Continuous integration enables frequent deployments throughout the day. For more detail on engineering practices, see the Engineering Rulebook. What this job can offer Challenging projects that support global collaboration between businesses and individuals Opportunities to make a direct impact as the company grows A supportive and flexible environment that values both personal and professional growth Location This is a fully remote position open to candidates anywhere in the world.

About RemoteAt Remote, we are addressing one of the most pressing challenges faced by modern organizations: managing global employment in a compliant and effortless manner. Our platform empowers businesses of all sizes to hire, pay, and oversee international teams seamlessly. Driven by our core values and a forward-thinking culture, our dedicated team tackles ambitious challenges from all corners of the globe, with team members across six continents (Antarctica is the last frontier!). As a fully remote company, we embrace flexibility and innovation, integrating Automation and AI capabilities into every position.We invite every member of our team to contribute their unique talents, experiences, and cultures to help us build a world-class HR platform. If you are enthusiastic, inquisitive, driven, and ambitious, we want you to join us in shaping the future of work!The PositionAs a Senior Backend Engineer, you will collaborate with a diverse team of engineers specializing in Frontend, Backend, SRE, and QA. Our teams are organized into cross-functional units dedicated to specific verticals, allowing for impactful contributions across the organization.This role is open across several teams, and we will identify the best fit for you during the interview process based on business needs and your personal preferences.You will be instrumental in developing tools, APIs, and integrations for one of our innovative products.Our tech stack includes Elixir and Phoenix for the backend, with a Postgres database. We utilize React and Next.js on the frontend, while GitLab serves as our version control system, issue tracker, and CI/CD solution. Our applications are hosted on AWS, and we leverage continuous integration for deployments, enabling multiple daily updates.What We OfferEngaging and meaningful challenges that empower individuals and businesses to thrive globally.A chance to make a significant impact within a growing company where your contributions will resonate for years to come.

Join Kaizen Gaming as a Senior Backend Engineer and be part of a dynamic Agile team dedicated to crafting innovative solutions for millions of users worldwide. Collaborate with cross-functional teams to drive impactful projects, from user-facing applications to robust backend services, ensuring high performance and reliability. Your expertise will guide the development of scalable systems, turning complex requirements into elegant technological solutions.

Join Our Engineering TeamAt Cacheflow, we are seeking a talented and driven Senior Backend Engineer to help us build scalable and innovative solutions in the fintech space. As part of our founding team, you will have the unique opportunity to collaborate closely with our CEO and CTO, giving you significant influence over the technology, architecture, and culture of our company.Our Technology StackWe utilize cutting-edge technologies including AWS, Java, React, TypeScript, NodeJS, and Kafka to develop our solutions.

Twindo is pioneering the transformation of the remodeling, architecture, and interior design sectors through innovative AI and computer vision technologies. Our LiDAR-enabled iPhone and iPad scans generate accurate 3D representations of homes in mere minutes, delivering interactive models with precise measurements. Our proprietary technology converts these scans into detailed, editable as-built files in industry-standard formats. Our groundbreaking technology was showcased during Apple's keynote event when the LiDAR sensor was launched, and we are currently modeling millions of square feet every month.As a globally distributed, virtual-first organization, our team spans across various regions, with significant representation in the US and Europe.We are in search of a Senior Backend Engineer to contribute to the development and maintenance of our internal platform and tools, promoting business scalability and engineering efficiency. Reporting to the Platform Team Lead, this position involves a dynamic blend of foundational backend development and DevOps responsibilities, making it perfect for individuals who thrive on diverse projects. Collaboration with our iOS, Computer Vision, Visualization & Tooling, Web, Infrastructure, and Data engineering teams, as well as other departments, will be crucial.

About RemoteAt Remote, we are addressing a pivotal challenge faced by modern organizations: the complexities of global employment compliance. Our innovative solutions empower businesses of all sizes to effectively recruit, pay, and manage teams across borders. With a dynamic work culture rooted in core values, our team is committed to tackling ambitious challenges asynchronously from various locations around the globe. Join our diverse workforce that spans six continents (Antarctica is the only one missing!), with all positions being fully remote.Innovation is a cornerstone of our ethos, driving us to integrate Automation and AI into the fabric of every role.We invite every member of the Remote team to contribute their unique talents and cultural perspectives to help us build a world-class HR platform. If you are an enthusiastic, inquisitive, and driven individual, we encourage you to apply and shape the future of work with us!The PositionAs a Senior Backend Engineer, you will collaborate with a talented team of engineers spanning Frontend, Backend, SRE, and QA domains. Our engineers work in cross-functional teams focused on specific verticals.This role is open across multiple teams, and we will identify the best fit for you during the interview process based on business needs and your preferences.You will be instrumental in developing tools, APIs, and integrations for one of our exciting products.Our backend technology stack includes Elixir and Phoenix, with a PostgreSQL database. The front-end is powered by React and Next.js. We utilize GitLab for version control, issue tracking, and CI/CD processes. Our applications are hosted on AWS, and we leverage continuous integration for deployments, enabling multiple deployments each day.What You Can Expect from This RoleEngage in complex and meaningful challenges that empower individuals and businesses to operate globally.Make a significant impact on our business; being early in our journey means your contributions will greatly influence our growth.