Software Engineer, Applied AI

Mercors mission is to organize human intelligence to power the AI economy. Were 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. Mercors APEX benchmark family measures AIs 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. 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.

As a Software Engineer on Applied AI youll build deploy and operate systems that sit directly between frontier AI research and data delivery.

This is a high-ownership deeply technical role. Youll work through ill-defined problems prototype quickly with researchers and customers and take systems from early experiments to reliable scalable production. Youll own projects end-to-end: spanning requirements gathering creating data creation pipelines and improving model-adjacent infrastructure while partnering closely with frontier AI labs and Mercors internal teams to ship high-impact applied AI solutions.

• Partner closely with frontier AI labs to understand their data post-training and evaluation needs

• Build and operate scalable data pipelines for post-training workflows and model evaluations

• Design and build scalable systems for synthetic data generation and data quality and work directly with customers to understand requirements and develop technical solutions

• Prototype new data types benchmarks and evaluation frameworks

• Lead technical discussions with customers

• Direct frontier exposure. Youll work closely with researchers at leading AI labs building infrastructure that directly accelerates cutting-edge research.

• Coding customer work. This role blends deep technical execution with customer interaction. Engineers who enjoy both building and communicating tend to thrive.

• Fast-moving high-ownership environment

• Technically demanding collaborative work

• Building the plane while flying it

• In-person culture at our new New York office at One World Trade Center

• Aligned with frontier research timelines

• Strong backend engineering fundamentals in a modern language (Python Go Rust etc.)

• Experience with model training and inference

• Strong grounding in statistical analysis and experimental design for measuring model performance and improvements

• Familiarity with evaluation methods for large language models

• Comfort working through ambiguity and shipping iteratively

• Enjoys ownership and customer-facing problem solving

• Thinks entrepreneurially and moves quickly

• Balances speed with engineering rigor

• Communicates clearly with technical and non-technical users

• Direct exposure to frontier AI research

• Real ownership and visible impact

• Technical depth paired with human interaction

• Fast feedback loops and high leverage

• There are very few roles that combine this level of technical rigor customer proximity and research exposure.

• 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