Full Stack Developer

Why Karsun?

Join Karsun Solutions to grow your career with the company transforming possible for the US Government.

At Karsun, collaboration drives our community. We're committed to building an environment where team members from diverse backgrounds can innovate, learn and grow with us. Here at Karsun, the only limit to your potential is the limit of your curiosity.

Join Team Karsun, and Find Your Next!

Summary:

We're building ReDuX-an AI-native platform that transforms legacy systems using agentic automation, domain knowledge, and cutting-edge LLMs. It's used to rewrite millions of lines of COBOL and Natural/Adabas into modern, cloud-native apps-powered by the latest in AI and cloud innovation.

As part of our core product team, you won't just integrate with AI-you'll build with it. You'll work directly on LLM workflows, integrating advanced prompt engineering, embeddings, and even LLM fine-tuning using techniques to make agents more accurate, adaptive, and human-aligned.

• Ship full-stack features across our React frontend, backend APIs (Node.js/Python), and AI orchestration layer
• Build developer tools, IDE extensions, and sidecar services that let humans and AI agents collaborate
• Implement prompt chaining, embedding search, and LLM integration through Amazon Bedrock (Titan, Claude)
• Train and fine-tune LLMs using user feedback, RLHF, and next-gen methods like GRPO to continually improve our AI agents
• Contribute to scalable architecture on AWS EKS, Postgres, S3, OpenSearch, Neo4j, and more

• Learn fast, build fast, and want your work to matter
• Know React, TypeScript, Python or Node.js-and want to expand into AI tooling
• Experience with LLMs, prompt engineering for coding
• Are excited about working directly with LLMs, agentic design patterns, and real customer scenarios
• Have a hacker's mindset and a product builder's instinct
• Are curious about legacy modernization and how AI changes the game

• Work on real problems-government-scale legacy systems, not sample apps
• Build and ship fast, with the latest AI tools and full ownership of features
• Learn from a senior team and help shape a product that's scaling fast
• Be at the frontier of AI-assisted software development

Things to Know:

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, local, or international law.

Third Party Resumes: Karsun does not accept unsolicited resumes through or from search firms or staffing agencies. All unsolicited resumes will be considered the property of Karsun and Karsun will not be obligated to pay a placement fee.

Clearance Information

This position requires the eligibility to obtain a security clearance. The Defense Industrial Security Clearance Office (DISCO), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here: https://www.state.gov/m/ds/clearances/c10978.htm