Senior Product Engineer, Fullstack

Together AI•San Francisco, CA

4d•$160,000 - $230,000

About The Position

Together AI's product includes surfaces like Playground, Model Garden, Fine-Tuning, File Management, Batch Processing, and Model Evals, which are crucial for user experience on the platform. The role focuses on making these surfaces fast, intuitive, and enjoyable for developers. This is a fullstack engineering position within a growing Product Engineering team, emphasizing shipping valuable features. The engineer will work across core product surfaces to enhance existing capabilities and develop new ones. It's a high-ownership role on a small, fast-moving team where individual contributions have a visible impact. The role involves seeing work through to production, instrumenting and measuring its performance, and using data to inform future development.

Requirements

4–7 years of experience building and shipping real product to real users
Strong JavaScript/TypeScript fundamentals; TypeScript experience highly valued
Strong React expertise in a large-scale, production environment
Full-stack fluency: you connect the dots from data model to API design to state management to the UI, and know how to make the right call at each layer in service of clean, maintainable code and an intuitive user experience
A pragmatic approach to engineering — you know when to move fast and when to slow down, and you make that call based on user value
Curiosity about AI and LLMs — you want to understand the models and products you're building on top of, not just the code around them
Adept at building and improving agentic workflows, with good judgment for when to lean on AI and when not to
Cross-functional "we ship it" mentality — no narrow ownership, no finger-pointing
Experience with a backend language like Go or Python

Nice To Haves

Next.js, Tailwind, and shadcn/ui experience is a plus
Familiarity with product analytics (e.g., Amplitude) and systems monitoring (e.g., Grafana) is a plus
Experience with CI/CD workflows is a plus

Responsibilities

Ship improvements and new capabilities across Together AI's core product surfaces — Playground, Model Garden, Fine-Tuning, File Management, Batch Processing, and Model Evals
Own projects and features end-to-end, from data model and API integration through the user interface
Collaborate closely with other engineers to build clean, typed, reusable interfaces in our web application
Instrument and measure what you ship — add product analytics, monitor system health, and prove users are getting value with data
Work across design, product, and engineering to ship things that unlock user value
Raise the bar on frontend and fullstack quality across the team through code review and collaborative architecture decisions