Fullstack Product Engineer - Studio Platform

About Mercor

Mercor’s mission is to organize human intelligence for the AI economy. We build the infrastructure that enables frontier AI labs and enterprises to train, evaluate, and improve AI on real-world professional work. More than five million experts have joined our network, and we pay out over $5 million daily for their knowledge and expertise.

We built our training and evaluation infrastructure alongside the world’s leading AI labs. Now, we’re bringing those capabilities to enterprises across industries, enabling them to train, evaluate, and improve AI using their own expertise and standards. Our APEX benchmarks measure how AI performs on economically valuable work, while our enterprise evaluations and post-training capabilities turn those insights into measurable improvements across real-world workflows.

Our work sits at the intersection of frontier AI, human expertise, and real-world application. We’re solving problems few companies have encountered, with the opportunity to influence what the world’s most advanced AI systems become capable of doing. We’re looking for people who bring different perspectives, take ownership, exercise sound judgment, and hold themselves to an exceptionally high standard. You’ll have the opportunity to do consequential work alongside talented colleagues who challenge one another, collaborate openly, and share a commitment to excellence.

Mercor is profitable and recently raised a $750 million Series D at a $20 billion valuation. We work in person five days a week in San Francisco, New York, and London.

About the Role

Frontier models learn to do real work inside RL environments, and those environments get built in Studio. Studio is the product thousands of domain experts use to design, generate and verify RL environments, for the labs behind the models you use every day. We're building the next generation platform for the agentic creation of RL environments, which every leading model is born out of.

As a Fullstack Product Engineer on the Studio Platform team, you'll own the Studio user journeys end-to-end: the React frontend used daily by thousands of expert contributors and internal Strategic Project Leads, and the backend services powering data pipelines and delivery of outputs to customers. You'll also build and maintain the foundational layer that Mercor depends on to rapidly deploy new data types and task formats across the company. Four distinct stakeholders — AI labs, SPLs, expert contributors, and engineers— rely on what you build.

This is a role for someone who cares equally about engineering craft and product impact: shipping scalable, reliable systems and intuitive interfaces that make everyone who touches Studio faster and more effective.

What You'll Do

• Design how experts and agents work together. Agents draft the tasks, environments and graders, and experts steer and correct them. Your job is to make steering fast and reviewing easy.

• Build the environment workbench. Create the agentic framework that experts use to author every environment in Studio.

• Make long agent runs easy to follow. An expert should be able to understand a three-hour run in three minutes.

• Turn new environment types into configuration. When a customer asks for something new, it should ship in a day without an engineer writing code.

• Make quality visible. Build the agentic QC views that show what failed and why, and let people fix it where they find it.
  

What We're Looking For

• 5+ years of fullstack engineering experience building and shipping production software.

• You love to live in the product experience. You notice when a flow is one click too long, and you fix it without waiting for a spec.

• You’re excellent on the frontend. You know React, TypeScript and Next.js in depth. You’ve built interfaces that create enjoyable visual experiences from complex data.

• You go all the way down the stack. You’re comfortable designing the schema, the API and the background job behind the screen you’re building.

• You’ve shipped products before. You have about five years of building production software, ideally where you own a product area end to end.

• You build with AI. Coding agents are part of how you work, and you care about building the best agentic collaboration experience.

• You turn unsolved problems into a plan. You can take a vague problem from a user or partner team, find the first principles issue, and explain the tradeoffs clearly.

Nice-to-Haves

• Experience building tooling for data labeling, annotation, or human-in-the-loop AI workflows.

• Background in design systems, developer-facing APIs, or internal platform engineering.

• Exposure to AI tools, LLM-powered products, or real-time data and visualization.

• Experience at top-tier tech companies or fast-scaling startups.

Why This Role Matters

• Your impact compounds on a massive scale. Experts are paid per task, so a fast experience directly drives the bottom line when the effects are felt across hundreds of thousands of users.

• The feedback loop is tight. Features ship daily, and feedback loops are swift and efficient.

• You see the frontier early. You watch how the newest models fail before the public does.

Benefits

• Bi-annual performance bonus structure

• Generous equity grant vested over 4 years

• Up to $15k Relocation bonus

• $10K housing bonus (if you live within 0.5 miles of our office)

• $1.5K monthly stipend for meals

• Free Equinox membership

• $200 monthly laundry reimbursement

• $200 monthly personal wellness reimbursement

• Health, Dental, Vision insurance

Mercor is an Equal Opportunity Employer and is committed to providing equal opportunity to all employees and applicants. Mercor does not discriminate based on actual or perceived race, color, creed, religion, national origin, ancestry, citizenship status, age, sex or gender (including pregnancy, childbirth, related medical conditions and lactation), gender identity or gender expression, sexual orientation, marital status, military service and veteran status, disability, protected medical condition as defined by California or local law, genetic information, or any other characteristic protected by applicable federal, California, or local laws and ordinances. Further, Mercor prohibits discrimination, harassment, and retaliation based on any combination of protected characteristics. This Policy applies to all areas of employment, including recruitment, hiring, training, promotion, compensation, benefits, discipline, termination, and all other privileges, terms, and conditions of employment. This Policy and the law prohibit employment discrimination against any employee or applicant based on any legally protected status.