Full Stack Developer, Virginia

Overview:
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.

Responsibilities:
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

Qualifications and Education:
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

Compensation:
The proposed salary range for this role is $ to $ USD. The salary range provided is a good faith estimate representative of all experience levels. Karsun considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills.