About Legion

Let’s be real, AI isn’t magic; Legion was built to move beyond AI hype—delivering secure, reliable systems that work alongside the people tackling the world’s most critical challenges.

Born from a Department of Defense partnership and trusted by leaders across government and enterprise, Legion embeds intelligence inside complex systems, unlocking data, accelerating human workflows, and strengthening mission-critical systems. We don’t replace workflows—we optimize them, ensuring quality, efficiency, and reliability inside the platforms our partners already use.

With world-class collaborators like Palantir, Nvidia, HPE, and Oracle, we’re building intelligent infrastructure that enhances human capability and drives impact at the edge and across a range of enterprises.

We’re looking for bold thinkers and doers to join us in shaping the future of AI that’s secure, grounded, and built to work.

Staff Applied Machine Learning Engineer (Remote USA)

***This role requires expert level in development and deployment of machine learning models***

***US Citizenship or Greencard (Permanent US Residency) is required due to US Government contract requirements***

***You must be domiciled in the U.S. (must live permanently and maintain home address in the US)***

***As a step in the application process you will be required to provide legally authorized Identification to show verification of eligibility through third party provider CLEAR ID***

Senior Software Engineer, Machine Learning

As a Senior Software Engineer, Machine Learning, you will design, build, and evolve the core AI capabilities that power intelligent experiences across our enterprise AI platform. You will integrate modern foundation models into production systems, develop reusable AI capabilities, and continuously improve their quality, reliability, and performance. Working closely with cross-functional teams, you will transform advances in AI into secure, scalable, and production-ready capabilities that accelerate innovation across the platform.

Responsibilities

• Design, build, and maintain the core AI capabilities that power intelligent experiences across the platform.
• Develop reusable capabilities for model integration, reasoning, multimodal understanding, structured generation, evaluation, and other foundational AI functionality.
• Optimize the AI systems that power these capabilities through experimentation, quantitative evaluation, context engineering, and iterative refinement.
• Apply your production software engineering experience to build backend services, APIs, and distributed AI systems.
• Partner closely with cross-functional partners to deploy scalable AI services that enable product teams to rapidly build AI-powered experiences.