Senior Software Engineer - Platform (Remote US)

About Legion

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.

Job Summary

This role requires US Citizenship or a Green Card due to US Government contract requirements. The position also requires experience with the Rust programming language.

Responsibilities

• Design and develop foundational components and frameworks that serve as the building blocks for our Agentic AI platform.
• Collaborate with cross-functional teams to understand their needs and requirements, and create platform solutions that empower developers to build innovative applications on top of it.
• Cultivate a growth mindset, constantly studying and staying current with design patterns, techniques, and technologies that attract developers to platforms and frameworks.
• Work closely with machine learning engineers to build the infrastructure that supports ML workflows, ensuring seamless and efficient execution within enterprises.
• Provide production support and troubleshooting expertise to ensure the platform's smooth operation and address any performance or scalability challenges.

Required Skills And Qualifications

• US Citizenship or Green Card due to US Government contract requirements
• Bachelor's degree in Computer Science, Software Engineering, or a related field or equivalent experience
• 5–8+ years of software and platform engineering experience, with a strong track record of designing and operating large-scale distributed systems
• Experience building platform infrastructure and backend systems that serve multiple products and engineering teams
• Experience in Rust, with expertise in designing and developing high-performance systems
• Demonstrated expertise in database architecture and scalable data systems, including distributed databases, storage and indexing systems, data modeling and schema design, high-throughput and low-latency data access patterns
• Experience designing systems that support AI and machine learning workloads
• Familiarity with workflow engines, execution runtimes, and AI orchestration frameworks
• Growth mindset and low ego—eager to pick up new tools and technologies, learn from others, and be open to changing course when it’s right
• Drive to foster a culture of collaboration, psychological safety, and technical excellence
• Strong advocate for inclusion in technical discussions at all levels

Preferred Qualifications

• Start-up experience or comfort in 0→1 product environments
• Familiarity with Kubernetes
• Understanding of DevOps practices and CI/CD pipelines for platform deployment

Pay

$170,000 - $230,000 USD