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Full Stack Open Source Software Developer Jobs (NOW HIRING)

Sawmills.AI Inc.

Full Stack Engineer

San Francisco, CA · On-site

As a Full Stack Engineer at Sawmills.ai, you will be instrumental in building our Telemetry Data ... Advocate for and implement best practices in open-source software development, contributing to the ...

OpenAI

Full Stack Software Engineer, Codex

Seattle, WA · On-site

$255K - $405K/yr

The team is also responsible for developer-facing Codex experiences including the Codex IDE ... The team also works closely with the open-source software community, building tools that help ...

Anagh Technologies, Inc.

Full Stack Developer

Full-Stack (30% front end, 70% backend) * Confident in your abilities and delivery * Javascript ... Demonstrate being an avid supporter of the Open Source software community * Excellent time ...

SpruceID

Full-Stack Software Engineer - Remote

$120K - $200K/yr

Strong appreciation for open-source software , standards-based design , and community-driven ... Hands-on experience with cloud infrastructure (AWS, GCP, or Azure) and DevOps practices.

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How much do full stack open source software developer jobs pay per hour?

As of Sep 13, 2026, the average hourly pay for full stack open source software developer in the United States is $59.26, according to ZipRecruiter salary data. Most workers in this role earn between $49.28 and $68.27 per hour, depending on experience, location, and employer.

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Infographic showing various Full Stack Open Source Software Developer job openings in the United States as of August 2026, with employment types broken down into 1% As Needed, 78% Full Time, 18% Part Time, and 3% Contract. Highlights an 93% Physical, 2% Hybrid, and 5% Remote job distribution, with an average salary of $123,262 per year, or $59.3 per hour.

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

Rockville, MD • On-site

Neevsys LLC
IT Services • 1 - 10 employees
Learn more about Neevsys LLCexternal

$53.50 - $69/hr

Other

Posted 26 days ago

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.
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