Senior Product Engineer, Fullstack

Together AI; San Francisco (CA); On-site; USD 160,000 - 230,000; Full time

Benefits offered by this job

Equity

Health insurance

Competitive salary

Job summary

Together AI is hiring a senior full-stack engineer to ship improvements across Playground, Model Garden, Fine-Tuning, File Management, Batch Processing, and Model Evals. You will own projects end-to-end—from data model and API design to UI—collaborating with engineers to deliver clean interfaces and measurable value.

We seek a pragmatic engineer with 4–7 years of production experience, strong React skills, and fluency across the stack.

Qualifications

• 4–7 years of experience building and shipping real product to real users.
• Strong React expertise in a large-scale production environment.
• Full-stack fluency from data model to API design to UI state management.
• Pragmatic engineering—focus on user value over speed alone.
• Curiosity about AI and LLMs; interest in models and products.
• Agentic workflows with good judgment on when to leverage AI.

Responsibilities

• Ship improvements and new capabilities across core product surfaces (Playground, Model Garden, Fine-Tuning, File Management, Batch Processing, Model Evals).
• Own projects end-to-end from data model and API integration to UI.
• Collaborate to build clean, typed, reusable interfaces in the web app.
• Instrument and measure outcomes; add product analytics and monitor system health.

Skills

React expertise

Full-stack fluency

Data model to API/UI

AI/LLM curiosity

Agentic workflows

Cross-functional teamwork

Next.js

Tailwind

shadcn/ui

Amplitude

Grafana

CI/CD workflows

Go

Python

Tools

Amplitude

Grafana

CI/CD tools

Job description

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 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 is a research-driven artificial intelligence company. We believe open and transparent AI systems will drive innovation and create the best outcomes for society, and together we are on a mission to significantly lower the cost of modern AI systems by co-designing software, hardware, algorithms, and models. We have contributed to leading open-source research, models, and datasets to advance the frontier of AI, and our team has been behind technological advancement such as FlashAttention, Hyena, FlexGen, and RedPajama. We invite you to join a passionate group of researchers in our journey in building the next generation AI infrastructure.

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.

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.