GenAI Full-Stack Engineer for Frontier LLMs

Mercor; San Francisco (CA); On-site; USD 140,000 - 210,000; Full time

Job summary

Mercor seeks experienced Full-Stack Software Engineers to build, integrate, and stress-test production software atop frontier AI models. You’ll work with Python, Java, Rust, C#, C++, and TypeScript across the stack, shipping end-to-end solutions with a focus on reliability and observability.

This is a 40-hour/week W-2 role through Cincinnatus LLC, with placement at a leading AI lab. Candidates should onboard quickly and contribute working code early.

Qualifications

• 3+ years of dedicated professional experience building and shipping production software at a recognized, top-tier organization.
• Proficient in multiple languages (Python, Java, Rust, C#, C++, TypeScript) and able to contribute across the full stack.
• Experience with backend services, APIs, front-end frameworks (React or similar), databases, and cloud deployment.

Responsibilities

• Build and ship full-stack applications, services, and internal tools that exercise frontier model capabilities end to end.
• Integrate pre-release model APIs into working software and related scaffolding including interfaces, evaluation harnesses, and telemetry.
• Diagnose and document model and integration failure modes and provide clear feedback to research teams.
• Prototype quickly against shifting requirements and deliver working increments with limited upfront specification.
• Collaborate with the engineering manager and other engineers to maintain code quality, architecture, and documentation.

Job description

Mercor seeks experienced Full-Stack Software Engineers to build, integrate, and stress-test production software atop frontier AI models. You’ll work with Python, Java, Rust, C#, C++, and TypeScript across the stack, shipping end-to-end solutions with a focus on reliability and observability.

This is a 40-hour/week W-2 role through Cincinnatus LLC, with placement at a leading AI lab. Candidates should onboard quickly and contribute working code early.