Staff Engineer, API Core Platform

Together AI•San Francisco, CA

9h•$240,000 - $275,000

About The Position

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. 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. 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. 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.

Requirements

8+ years of experience building and operating large-scale production systems
Strong hands-on experience with Node.js in production environments
Strong proficiency with TypeScript in large, complex codebases
Proven experience evolving real-world systems into stable, scalable platforms
Deep understanding of system design, performance, and reliability at production scale
Experience improving runtime stability, performance, and operational maturity of server-side systems
Experience working across application and infrastructure layers
Demonstrated ability to drive architectural change across teams without formal authority
Strong experience with CI/CD systems, deployment workflows, and production operations
Experience establishing or improving observability (logging, metrics, tracing) in production environments
Bachelor’s or Master’s degree in Computer Science, Computer Engineering, or equivalent practical experience

Nice To Haves

Experience with Next.js and/or React in large-scale production environments
Experience evolving monolithic web applications into modular or service-oriented architectures
Experience operating production workloads in Kubernetes-based environments
Experience optimizing SSR performance and server-side runtime behavior
Experience improving system performance under high request volume and growth
Experience with Golang

Responsibilities

Own the evolution of the product runtime and application architecture, ensuring systems are resilient, scalable, and production-ready
Drive structural improvements within the existing web application, improving system boundaries, performance, and long-term maintainability
Lead initiatives that strengthen production stability, performance, and reliability across the application layer
Define and evolve runtime architecture patterns for server-side behavior, request handling, and scaling
Improve deployment safety, release confidence, and environment consistency across product engineering
Establish strong observability practices across the application stack, including logging, metrics, tracing, and debuggability
Identify and address structural bottlenecks that slow development or introduce operational risk
Partner with the API Platform team to help extract and separate API responsibilities from the application layer
Collaborate with the UI Platform team on runtime performance, framework behavior, and production characteristics of the web stack
Drive performance optimization efforts across the application tier, including latency reduction, scaling behavior, and resource efficiency
Improve CI/CD architecture and operational maturity to support fast, safe iteration
Mentor engineers and influence architectural direction across teams