Staff Engineer, API Core Platform

<p><strong>Staff Engineer — Product Engineering Core Platform</strong></p> <p><span style="font-size: 12pt;"><strong>About the role</strong></span></p> <p><span style="font-size: 12pt;">Together AI is seeking an experienced Staff Engineer to own and evolve the core product runtime that powers our Cloud application surfaces. This role sits at the intersection of infrastructure and application architecture and is responsible for ensuring our systems are stable, scalable, and cleanly structured as we grow.</span></p> <p><span style="font-size: 12pt;">You will lead the technical evolution of our production runtime and application architecture, strengthening the foundation that product engineers build on every day. In the near term, this includes improving the performance, reliability, and structure of our existing Next.js-based application and helping drive the separation of responsibilities across the stack. Over time, you will shape the long-term architecture of the product platform so teams can ship quickly and confidently at production scale.</span></p> <p><span style="font-size: 12pt;">This is a deeply hands-on Staff role for an engineer who has operated real production systems, improved them under pressure, and led structural change. You will be the technical owner of how the product runs in production — ensuring it remains fast, resilient, and easy to evolve as the company scales.</span></p> <p><span style="font-size: 12pt;">You will help shape the foundation that a rapidly growing product engineering organization builds on — transforming today’s systems into a platform that supports speed, reliability, and scale for years to come.</span></p> <h2><span style="font-size: 12pt;"><strong>Responsibilities</strong></span></h2> <ul> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Own the evolution of the product runtime and application architecture, ensuring systems are resilient, scalable, and production-ready</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Drive structural improvements within the existing web application, improving system boundaries, performance, and long-term maintainability</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Lead initiatives that strengthen production stability, performance, and reliability across the application layer</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Define and evolve runtime architecture patterns for server-side behavior, request handling, and scaling</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Improve deployment safety, release confidence, and environment consistency across product engineering</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Establish strong observability practices across the application stack, including logging, metrics, tracing, and debuggability</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Identify and address structural bottlenecks that slow development or introduce operational risk</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Partner with the API Platform team to help extract and separate API responsibilities from the application layer</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Collaborate with the UI Platform team on runtime performance, framework behavior, and production characteristics of the web stack</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Drive performance optimization efforts across the application tier, including latency reduction, scaling behavior, and resource efficiency</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Improve CI/CD architecture and operational maturity to support fast, safe iteration</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Mentor engineers and influence architectural direction across teams</span></li> </ul> <h2><span style="font-s ... (truncated, view full listing at source)