Staff Engineer, API Core Platform

<p><strong>Staff Engineer — API Core Platform</strong></p> <p><span style="font-size: 12pt;"><strong>About the role</strong></span></p> <p>Together AI is seeking an experienced Backend Engineer to found Together’s API Platform team within the Production Foundations organization. In this role, you will define, build, and scale the core systems and architecture that power Together’s mission-critical cloud control-plane APIs — including public customer APIs used directly by customers and through SDKs and CLIs, as well as the client APIs powering Together’s Cloud UI. This team is distinct from Together’s dedicated Inference API team, but partners closely with it to deliver a cohesive customer platform experience.</p> <p>In the near term, you will improve and standardize the backend API layer within our primary Next.js monolith, raising the bar on reliability, performance, and consistency. In parallel, you will design and lead the evolution toward scalable, purpose-built next-gen API platform solutions optimized for different Public API and Client API use cases and traffic patterns — defining the long-term architecture and driving its incremental rollout.</p> <p>This is a deeply hands-on role for an engineer who thrives on writing critical-path code and building platforms that unify engineering efforts across teams. You will work across backend systems, infrastructure layers, identity and access flows, and developer tooling to establish a cohesive API strategy that supports Together’s rapidly growing AI Cloud.</p> <h2><span style="font-size: 12pt;"><strong>Responsibilities</strong></span></h2> <ul> <li>Design and drive the evolution of Together’s API platform, defining how APIs are built, versioned, secured, tested, and operated across the company</li> <li>Own and improve the backend API layer within our primary Next.js monolith, raising the bar on consistency, reliability, and performance</li> <li>Architect and lead the transition toward scalable, purpose-built API plat