Senior Product Engineer, Fullstack

About the Role Together AI's product is what developers touch every day — Playground, Model Garden, Fine-Tuning, File Management, Batch Processing, Model Evals. These surfaces are how users experience the platform, and they need to be fast, intuitive, and something developers genuinely love using. That's what this role is about. We're growing the Product Engineering team and looking for a fullstack engineer who's motivated by shipping things users genuinely value — not features that just look good in a slide deck. You'll plug directly into new and existing workstreams and start shipping quickly, working across our core product surfaces to improve existing capabilities and build new ones. This is a high-ownership role on a small, fast-moving team, where one strong engineer moves the needle visibly. You'll see your work in production, instrument and measure it, and use that to shape what comes next. 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 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 • 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 • Experience with a backend language like Go or Python About Together AI Together AI, the AI Native Cloud, is purpose-built for AI engineers. AI application developers get high-performance inference that scales reliably, fine-tuning and reinforcement learning for creating frontier-level specialized models, and pre-training at massive scale for fully custom intelligence, all around a marketplace of leading open models that teams can run, adapt, and own. Trusted by Cursor, Decagon, ElevenLabs, Salesforce, and Zoom, Together serves 400+ trillion tokens a month. Compensation We offer competitive compensation, startup equity, health insurance and other competitive benefits. The US base salary range for this full-time position is: $160,000 - 230,000 + equity + benefits. Our salary ranges are determined by location, level and role. Individual compensation will be determined by experience, skills, and job-related knowledge. Application Policy Please read each role carefully and apply to the position best suited to you. Candidates are limited to 6 applications within a 90-day period, and applications beyond that limit will be automatically rejected. You may apply to additional roles 90 days after your last application. Equal Opportunity Together AI is an Equal Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more. Please see our privacy policy at https://www.together.ai/privacy.