Full Stack Engineer

LightFeather is seeking a Senior Full Stack Engineer to support a federal government client’s modernization of critical mission systems. The role focuses on understanding legacy workflows and delivering scalable full stack applications for a modern platform architecture.

Responsibilities:

• Design, develop, and maintain full stack applications supporting modernization of systems
• Analyze legacy systems and workflows to identify core functionality vs. unnecessary process overhead
• Translate operational requirements into scalable, modern application designs
• Develop backend services, APIs, and integration layers connecting legacy environments to modern platforms
• Build and enhance user-facing components using modern front-end technologies
• Support the full SDLC: analysis, design, development, testing, deployment, and maintenance
• Troubleshoot issues across application, integration, and data layers
• Collaborate with stakeholders to clarify requirements and improve system behavior
• Participate in code reviews and uphold engineering best practices

Requirements:

• U.S. Citizenship is required with the ability to obtain and maintain a Public Trust clearance
• Bachelor's degree in Computer Science or related field (or equivalent experience)
• 7+ years of hands-on full stack software development experience
• Experience working in complex or enterprise system environments
• Strong experience with Java and frameworks such as Spring Boot
• Experience designing and implementing RESTful APIs
• Experience with front-end technologies including JavaScript, React, HTML, and CSS
• Experience working with relational databases and data access patterns
• Ability to troubleshoot across multiple layers of an application stack
• Experience working in Agile or iterative delivery environments
• Ability to analyze and simplify complex systems and workflows
• Strong systems thinking and problem-framing capability
• Comfort working in ambiguous, poorly documented environments
• Ability to distinguish between essential functionality and legacy process bloat
• Strong ownership mindset and accountability for outcomes
• Effective communication with both technical and non-technical stakeholders
• High learning agility and willingness to adopt new platforms and tools
• Experience with legacy system modernization or transformation efforts
• Experience supporting federal or mission-driven environments
• Exposure to enterprise data platforms or large-scale system integrations
• Experience working in environments where requirements must be derived from real-world usage rather than formal documentation