Together AISenior Product Engineer, Fullstack
Together AI is hiring a Senior Product Engineer, Fullstack in San Francisco, United States. It pays $160k-$230k a year and Level rates it ; you can apply on Together AI.
Level's read on this job
- Level rates this role Works on AI ●●●○: the daily work is on AI products, without building the model.
- Tools and skills the posting cites include Cursor, Elevenlabs and Decagon.
- Level classifies it as a senior role.
- Level lists 83 other open roles at Together AI.
AI in this role
Build and ship core fullstack AI product surfaces including playgrounds, fine-tuning, and model evaluations at Together AI.
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.
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.
How we rate this
Senior Product Engineer, Fullstack at Together AI rates 65 out of 100 for how much of the daily work is AI. That makes it Works on AI (AI Level 3 of 4). The level is about AI in the job, not seniority.
Works on AI. The daily work is on AI products, without building the model.
- ●●●● Builds AI80 to 100
- ●●●○ Works on AI60 to 79
- ●●○○ Uses AI40 to 59
- ●○○○ Little AI0 to 39
Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.
Prepare for this job
Built from this posting and from similar jobs on Level.
Skills and AI tools this role asks for
Questions you could be asked
- How do you decide when an AI agent can act on its own versus asking for approval first?
- Walk me through fine-tuning a model: what data did you use, and how did you check the result?
- Tell me about a project where fullstack development was part of your work. What did you do?
- Tell me about a project where frontend was part of your work. What did you do?
- Tell me about a project where api design was part of your work. What did you do?
Adapt your resume
- List these exact terms on your resume: AI agents, Fine-tuning, Fullstack Development, Frontend, and API Design. An applicant tracking system matches the wording, not the idea.
- Attach one line of real, concrete experience to at least one of them. A tool named with nothing behind it rarely survives a human read.
- Show where AI is part of your daily process, not a one-off project. This role expects it to be a running habit.
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