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About the Role
As a Full Stack Software Engineer on the Agent Platform team, you'll own the React frontend and backend services that orchestrate agents, data, and integrations. You will be responsible for the enablement of internal users and enterprise clients, ensuring the platform is both powerful and polished for demos. This role is for someone who values engineering craft and product impact, shipping scalable, reliable systems and intuitive interfaces.
Responsibilities
- Own the agent platform across the full stack — from the internal- and client-facing React interfaces to the backend APIs and services orchestrating agents, workflows, and integrations.
- Enable hundreds of internal users and dozens of enterprise clients — ship the features, reliability, and polish that make the platform their daily driver and a confident live demo.
- Build the foundational layer other teams depend on to stand up new agent use cases, task formats, and client configurations quickly and without rework.
- Ship high-leverage product features that raise both internal productivity and the customer-facing quality of the platform.
- Translate ambiguous requirements into well-scoped technical solutions through close collaboration with Applied AI researchers, product, design, and operations.
Requirements
- 2+ years of fullstack engineering experience building and shipping production software.
- Deep proficiency in JavaScript/TypeScript (React + Next.js) and a strong grasp of frontend architecture, state management, and design patterns.
- Solid backend experience in Python and/or Node.js — designing and building relational databases, REST APIs, and async task infrastructure.
- Strong design sense and empathy for end-users; you hold a high bar for usability.
- Experience with complex, high-throughput systems — pipelines, large data volumes, or multi-tenant architectures.
- High ownership mindset; able to navigate ambiguity and drive projects from design through delivery.
- Strong communication skills and ability to articulate technical and product tradeoffs clearly.
Skills
- JavaScript/TypeScript
- React
- Next.js
- Frontend architecture
- State management
- Design patterns
- Python
- Node.js
- Relational databases
- REST APIs
- Async task infrastructure
- Agent frameworks
- LLM-powered products
- Human-in-the-loop AI workflows
- Design systems
- Developer-facing APIs
- Internal platform engineering
- AI tools
- Real-time data
- Data visualization
Location
- San Francisco
- NYC
- London
Work Type
- In-person five days a week
Experience Level
- 2+ years of fullstack engineering experience
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
About the Company
- Mercor's mission is to organize human intelligence to power the AI economy.
- We're a leading AI data company, building the layer between human expertise and frontier models.
- Millions of domain experts on the platform are paid over $4 million per day to train frontier AI models.
- Mercor's APEX benchmark family measures AI's real-world impact on professional work.
- Mercor Enterprise brings this same infrastructure to Fortune 500 companies: helping companies capture how their best people actually work, translating that expertise directly back into agents.
- Mercor is creating a new category of work where expertise powers AI advancement.
- Achieving this requires an ambitious, fast-paced and deeply committed team.
- You’ll 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.