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Senior Software Engineer Full Stack Engineer (TypeScript) Together.ai is looking for a Senior Software Engineer to take a leading role in the authentication, authorization, and collaboration systems that every Together product depends on. As part of the Product Foundations engineering group, the Identity & Collaboration team owns authentication flows (including SSO and OAuth), organizations, projects, API keys, and the role-based access controls that enable secure collaboration at scale. Every customer interaction with Together relies on the systems we build. Whether it's a researcher accessing their models, an enterprise team collaborating on a shared project, or a developer making an API call, we make authentication seamless and invisible for simple cases while providing robust, enterprise-grade capabilities for complex organizational structures. Our work directly enables Together's growth from individual users to large enterprise teams, and we're actively building the next generation of collaboration features that will unlock new ways for customers to work together securely and efficiently across all Together products. About the Role Location: Hybrid in Amsterdam, NL, Remote in the UK and Germany. Must have the ability to work in these locations without visa support. Full-time: This means 40 flexible hours, Monday through Friday. You'll work with a good deal of autonomy, owning meaningful pieces of our identity and access platform end-to-end, spotting problems worth solving, and contributing to the team's technical direction. You'll also help raise the bar around you through code and design review and by supporting more junior engineers. Responsibilities  Design and own authentication and authorisation systems end-to-end: SSO, OAuth/OIDC, SAML, organizations, projects, API keys, and role-based / attribute-based access control Make and document the technical decisions that shape how identity works across every Together product Build across the stack — Elixir/Phoenix services on the backend and TypeScript/Next.js on the frontend — and the APIs other teams build on Contribute directly to our Next.js product surface and the API layers behind it Run the Elixir/Erlang VM (BEAM) in production Identify and address technical debt and security risk in our area with sound judgment Treat code and design review as a core part of your contribution, and mentor more junior engineers Represent the team in cross-functional discussions on identity and security Maintain our systems to a high standard of code quality, documentation, automated testing, and continuous delivery Work with relational (PostgreSQL) and non-relational (MongoDB) data Requirements Around  4–5 years  of professional experience building production software (a mid-to-senior role rather than a staff-level one) Experience with authentication and authorization in production — OIDC, SAML, OAuth, JWT, RBAC, ABAC, and SSO — with a real understanding of the security tradeoffs involved Must have TypeScript (backend and/or frontend, and ideally Next.js and or JS React) Strong technical judgment, with a track record of maintainable, well-crafted solutions Comfortable breaking ambiguous problems into executable work and using prototypes and demos to de-risk Treats code and design review as a core part of their contribution, and helps develop the engineers around them A clear communicator who influences peers through strong technical output Willing to become proficient in Elixir and Phoenix if not already About Together AI Together AI is a research-driven artificial intelligence company. We believe open and transparent AI systems will drive innovation and create the best outcomes for society, and together we are on a mission to significantly lower the cost of modern AI systems by co-designing software, hardware, algorithms, and models. We have contributed to leading open-source research, mode