Own full-stack modernization of complex federal legacy systems using Palantir as the target platform. Responsibilities include analyzing workflows, designing scalable applications, developing Java and Spring Boot backend services and APIs, building React-based user interfaces, integrating legacy environments, troubleshooting across application and data layers, and supporting the full SDLC. The role also requires stakeholder collaboration, code reviews, Agile delivery, and simplifying undocumented or inefficient processes.
LightFeather is seeking a Senior Full Stack Engineer to support a federal government client in modernizing critical mission systems. You will own full stack delivery with a focus on translating complex legacy system behavior into clean, scalable software.
The current environment includes large legacy systems managing operational workflows such as processing, tracking, and encounter management. These systems carry layers of business rules, manual processes, and tightly coupled functionality. The core challenge is understanding how they work in practice, identifying mission-critical functionality, and translating it into a modern platform-based architecture. The client is adopting Palantir as the target modernization platform. This is a Full Time, Remote Position.
- Location: Fully Remote (EST hours)
- Job Type: Full-time
- Salary: $90,000–$115,000 annually, based on experience level.
- Clearance Requirement: U.S. citizenship is required for this position due to federal contract requirements and the need to obtain and maintain a Public Trust.
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.
Required Qualifications and Skills:
- 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.
Preferred:
- 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.
Why Join LightFeather?
At LightFeather, you're not just taking a job — you're joining a purpose-driven team that delivers innovative, mission-critical solutions to make a real difference. You'll work on diverse, meaningful projects that challenge and inspire you, alongside some of the best minds in the industry.
LightFeather is an Equal Opportunity Employer. We consider all qualified applicants for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, disability, veteran status, genetic information, or any other status protected by applicable federal, state, or local law.
Similar Jobs
Information Technology • Productivity • Software • Infrastructure as a Service (IaaS)
Build scalable, data-intensive products from the ground up, focusing on Java/Kotlin backend services, REST or GraphQL APIs, data access, and React/TypeScript interfaces. Responsibilities include architecture, performance optimization, testing, observability, production troubleshooting, technical documentation, and end-to-end feature ownership. Collaborate with data, reporting, design, and product teams while using AI-assisted development tools to accelerate delivery.
Top Skills:
APIsCaching LayersCSSGraphQLGrpcHTMLJavaJavaScriptKotlinObservability ToolsReactRelational DatabasesRestSQLTypescript
Cloud • Information Technology • Productivity • Security • Software • App development • Automation
Lead the technical direction and implementation of large-scale SaaS product features. Build secure, reliable, maintainable, well-tested software; evaluate architectural trade-offs; debug team inefficiencies; and contribute to code reviews, documentation, and complex bug fixes. Collaborate across product, design, and engineering, influence strategy, identify organizational blockers, mentor engineers, and improve engineering practices around testing, performance, security, privacy, and reliability.
Top Skills:
AWSDistributed SystemsJavaKotlinMicroservicesObservability ToolsSaaS
Big Data • Fintech • Mobile • Payments • Financial Services
Leads technical vision and strategy for Affirm’s Marketplace, Search, Ads Platform, and consumer experiences. Designs scalable full-stack platforms, guides architecture and technical excellence, coordinates initiatives across engineering teams, mentors engineers, and drives reliable delivery of customer-focused products across iOS, Android, and Web.
Top Skills:
AndroidiOSJavaScriptKotlinReact Native
What you need to know about the Los Angeles Tech Scene
Los Angeles is a global leader in entertainment, so it’s no surprise that many of the biggest players in streaming, digital media and game development call the city home. But the city boasts plenty of non-entertainment innovation as well, with tech companies spanning verticals like AI, fintech, e-commerce and biotech. With major universities like Caltech, UCLA, USC and the nearby UC Irvine, the city has a steady supply of top-flight tech and engineering talent — not counting the graduates flocking to Los Angeles from across the world to enjoy its beaches, culture and year-round temperate climate.
Key Facts About Los Angeles Tech
- Number of Tech Workers: 375,800; 5.5% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: Snap, Netflix, SpaceX, Disney, Google
- Key Industries: Artificial intelligence, adtech, media, software, game development
- Funding Landscape: $11.6 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Strong Ventures, Fifth Wall, Upfront Ventures, Mucker Capital, Kittyhawk Ventures
- Research Centers and Universities: California Institute of Technology, UCLA, University of Southern California, UC Irvine, Pepperdine, California Institute for Immunology and Immunotherapy, Center for Quantum Science and Engineering
