Mirrai Careers

Software Engineer, Applied AI

Mercor

New York City Full-time$130k–$500k / year Posted 3d ago
Above market. This role pays above the $223k median for similar USD roles (653 comparable postings in our corpus).
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ABOUT MERCOR 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. We work in-person five days a week in our San Francisco, NYC, or London offices. ABOUT THE ROLE As a Software Engineer on Applied AI, you’ll build, deploy, and operate systems that sit directly between frontier AI research and data delivery. This is a high-ownership, deeply technical role. You’ll work through ill-defined problems, prototype quickly with researchers and customers, and take systems from early experiments to reliable, scalable production. You’ll 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 Mercor’s internal teams to ship high-impact applied AI solutions. WHAT YOU’LL DO * 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 WHAT MAKES THIS ROLE DIFFERENT * Direct frontier exposure. You’ll 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. DAY-TO-DAY * 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 WHAT WE’RE LOOKING FOR * 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 YOU’RE LIKELY SOMEONE WHO * 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 WHY ENGINEERS JOIN * 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. 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

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