Fullstack Engineer, Assesment

About Mercor

Mercors mission is to organize human intelligence to power the AI economy. We partner with leading AI labs and enterprises to provide the human intelligence essential to AI development. Our vast talent network trains frontier AI models in the same way teachers teach students: by sharing knowledge experience and context that cant be captured in code alone. Today more than 30000 experts in our network collectively earn over $3 million a day.

Mercor is creating a new category of work where expertise powers AI advancement. Achieving this requires an ambitious fast-paced and deeply committed team. Youll work alongside researchers operators and AI companies at the forefront of shaping the systems that are redefining society. Mercor is a profitable Series C company valued at $10 billion. We work in-person five days a week in our San Francisco NYC or London offices.

About the Role

As a Member of Technical Staff on the Talent Experience team youll build the systems that evaluate the skills and expertise of the worlds top talent at scale.

Assessment is at the core of how Mercor works: every expert in our network is vetted matched and continuously evaluated through our assessment platform. Youll own backend-heavy full-stack work across this platformdesigning evaluation pipelines building the services that power AI-assisted interviews and skill verification and shipping the product surfaces that tens of thousands of candidates and experts interact with every day.

Youll work directly with the Assessment product lead on roadmap and execution with significant ownership from day one. This is a high-leverage role: improvements to assessment quality and throughput compound across everything Mercor does.

You Will

• Design build and ship backend services and APIs that power Mercors assessment platform at scale.

• Own features end-to-endfrom product discussions and technical design to implementation testing and release.

• Build evaluation pipelines and data models that combine human judgment with AI-powered scoring.

• Contribute across the stack including the candidate- and expert-facing product surfaces of assessment flows.

• Partner closely with Product AI and Data teams to translate assessment research into production systems.

• Leverage modern AI coding tools to accelerate development while maintaining a high engineering bar.

• Improve the performance reliability and observability of assessment infrastructure.

• Solve real customer problems and continuously improve candidate and expert experience.

What Were Looking For

• 3 years of professional software engineering experience building production systems.

• Strong backend fundamentals: API design data modeling distributed systems and relational databases.

• Comfortable working across the stack including modern frontend frameworks (e.g. React/TypeScript) when the product needs it.

• Experience building or integrating LLM-powered features in production is a strong plus.

• Comfortable building products using modern AI development tools (e.g. Cursor Claude Code GitHub Copilot Codex or similar) to accelerate software development.

• Strong software engineering fundamentals including testing debugging and performance optimization.

• Excellent product intuitionyou enjoy building products that people actually use.

• Comfortable working in fast-moving environments with evolving priorities.

• High ownership curiosity and a bias toward shipping.

Why this role matters

• Impact: Build the evaluation systems that decide how tens of thousands of AI experts are matched to the worlds most important AI work.

• Ownership: Join a small high-velocity engineering team where youll own features end-to-end and shape the assessment roadmap from day one.

• Learning: Work alongside world-class engineers product leaders and AI researchers building products at the frontier of AI.

• Growth: Rapid career progression with opportunities to expand ownership as the assessment platform and engineering organization scale.

Benefits

• Bi-annual performance bonus structure

• Generous equity grant vested over 4 years

• Up to $15k Relocation bonus

• $10K proximity 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

Required Experience:

IC