Senior Full-Stack AI Software Engineer (Remote, Contract)

Mercor; San Francisco (CA); Remote; USD 124,000 - 152,000; Full time

Job summary

Mercor, headquartered in San Francisco, seeks a Senior Software Engineer, Full Stack (Python, Java, Rust, C#, C, TS) for a 40‑hour weekly remote contract. You will build and ship full‑stack applications, integrate model APIs, and document failures while collaborating with the team.

Requires 6+ years of production software experience and deep stack ownership across backend, frontend, data modeling, and cloud deployment. Strong written communication is essential.

Qualifications

• 6+ years of professional software development experience.
• Production experience in at least one of Python, Java, Rust, C#, or C .
• Ownership across the stack: backend APIs, frontend framework, data modeling, and cloud deployment.
• Able to onboard onto unfamiliar codebases and deliver functioning code quickly.
• Excellent written communication skills.

Responsibilities

• Build and ship full‑stack applications, services, and internal tools in Python, Java, Rust, C#, C , or TypeScript to exercise frontier model capabilities.
• Integrate pre-release model APIs into working software, including tool interfaces, evaluation harnesses, and telemetry.
• Diagnose and document model and integration failure modes, translating engineering observations into clear written feedback for the research team.
• Prototype quickly against shifting requirements, delivering working increments with limited up-front specification.
• Collaborate with the engineering manager and other engineers to maintain consistency in code quality, architecture, and technical documentation.

Skills

Backend development

Frontend integration

API design

Cloud deployment

Strong written communication

Code ownership

Job description

Mercor, headquartered in San Francisco, seeks a Senior Software Engineer, Full Stack (Python, Java, Rust, C#, C, TS) for a 40‑hour weekly remote contract. You will build and ship full‑stack applications, integrate model APIs, and document failures while collaborating with the team.

Requires 6+ years of production software experience and deep stack ownership across backend, frontend, data modeling, and cloud deployment. Strong written communication is essential.