Full-Stack Java Developer — open source & AI-assisted delivery

Neevsys LLC; Rockville (MD); On-site; USD 130,000 - 210,000; Full time

Job summary

Neevsys LLC is seeking two Senior full-stack Java engineers to design, build, and maintain modern API-driven applications on a cloud-based platform. You will integrate LLMs, RAG, and vector stores, contributing to AI-powered business applications and leveraging agentic coding tools to accelerate delivery.

The role emphasizes open-source contributions, strong API and SQL skills, and the ability to learn a new platform quickly within a secure government cloud environment in Rockville, MD.

Qualifications

• Demonstrable open-source contributions to public repositories with merged PRs.
• Hands-on experience using AI/LLM development harnesses or agentic coding tools.
• API and service integration; solid SQL and data-handling skills.
• Ability to learn an unfamiliar platform / middleware stack quickly.
• US work authorization; clearance eligibility per contract environment.

Responsibilities

• Design, build, and maintain full-stack Java applications on a cloud-based middleware platform.
• Integrate large language models, RAG, and vector data stores into features.
• Use AI development harnesses to prototype and ship solutions faster.
• Contribute high-quality, well-tested code and participate in code reviews.
• Work in a secure government cloud environment and adapt to evolving requirements.

Skills

Open-source contributions

AI/LLM tooling

API integration

SQL data handling

Learning unfamiliar platforms

Tools

Docker

Kubernetes

Job description

Over 10 years we helping companies reach their financial and branding goals. Onum is a values-driven SEO agency dedicated.

Job Description

Neevsys is currently seeking two Senior full-stack Java engineers who build modern, API-driven applications, contribute to open-source software, and use AI development harnesses to accelerate delivery — proficiencies that map directly to building AI business applications on our platform.

Responsibilities

• Design, build, and maintain full-stack Java applications (backend services and web front-ends) on a cloud-based middleware platform.
• Integrate large language models, retrieval-augmented generation (RAG), and vector data stores into application features.
• Use AI development harnesses and agentic coding tools to prototype and ship solutions faster.
• Contribute high-quality, well-tested code; participate in code review and uphold engineering standards.
• Work within a secure, government cloud environment and iterate as platform requirements evolve.

Required skills

• Demonstrable open-source contributions — public repositories and merged pull requests to established projects.
• Hands-on experience using AI / LLM development harnesses or agentic coding tools to build software.
• API and service integration; solid SQL and data-handling skills.
• Ability to learn an unfamiliar platform / middleware stack quickly.
• US work authorization; clearance eligibility per contract environment.

Preferred

• GenAI application experience: embeddings, RAG, and vector databases (pgvector, ChromaDB, Pinecone, or similar).
• Cloud (AWS or Azure) and containerization (Docker / Kubernetes).
• Prior federal or regulated-environment delivery.