Full-Stack Software Engineer for AI Model Development

Contribute to a GenAI engineering team that builds production software on top of frontier large language models. You will develop full-stack applications, integrate pre-release model APIs, and stress-test model-driven systems before they ship, working directly with the engineering manager to deliver working code quickly.

• Build and ship full-stack applications, services, and internal tools using Python, Java, Rust, C#, C++, or TypeScript that exercise model capabilities end to end.
• Integrate pre-release model APIs and build the surrounding scaffolding, including tool interfaces, evaluation harnesses, and telemetry.
• Diagnose, document, and communicate model and integration failure modes discovered while building, providing clear written feedback for the research team.
• Prototype rapidly against shifting requirements, delivering working increments with limited up-front specification.
• Collaborate with the engineering manager and other engineers to maintain code quality, consistent architecture, and technical documentation.

• At least 3 years of professional experience building and shipping production software at a recognized, top-tier organization.
• Production experience in at least one of Python, Java, Rust, C#, or C++, plus working proficiency in a second language from that list or TypeScript. This cohort is intentionally staffed across multiple language ecosystems.
• Hands-on experience across the stack: backend services and APIs, a modern front-end framework such as React or equivalent, relational or document databases, and cloud deployment.
• Proven ability to onboard onto an unfamiliar codebase and deliver working code quickly with minimal ramp-up.
• Demonstrable career progression, and strong written communication skills to explain complex technical decisions clearly.
• Ability to engage reliably for at least 40 hours per week during weekdays.

• Location: United States.
• Employment type: hourly, full-time commitment of 40 hours per week, weekdays.
• This is a W-2 employment position with Cincinnatus LLC, serving as the employer of record, with placement on a leading AI lab team as part of their extended workforce.
• Project and team assignments are coordinated to leverage language and technology strengths within the cohort.

• Pay rate: $50.00 to $65.00 per hour.

• Cincinnatus LLC will be the employer of record for this position, providing W-2 employment, payroll, benefits, and compliance while placing employees directly within client teams.
• The employer is an Equal Employment Opportunity employer, and does not discriminate on legally protected characteristics.

Once placed, you will onboard directly with the AI lab engineering manager on fast-moving projects. New engineers are expected to ramp quickly and contribute working code early in the engagement.