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Senior Open Source Developer Jobs (NOW HIRING)

Braintrust

Open Source Engineer - Python

New York, NY · On-site +1

Care deeply about developer experience, from clean APIs and clear docs to thoughtful error handling ... You've contributed to popular open source projects, led SDK adoption at your organization, are ...

Neura Market

As a Senior Developer Advocate for Omnigent, you'll be a vital bridge between our engineering teams and the open source community forming around Omnigent, our meta-harness for AI agents. Omnigent ...

Onehouse

Senior Software Engineer, Open Source (US)

$125K - $165K/yr

They are seeking a Senior Software Engineer for their Open Source team to help shape the vision for Apache Hudi and enhance collaboration between the open-source project and Onehouse's managed ...

Braintrust

Open Source Engineer - Go

New York, NY · On-site +1

Care deeply about developer experience, from clean APIs and clear docs to thoughtful error handling ... You've contributed to popular open source projects, led SDK adoption at your organization, are ...

Ecompex

Open Source Analyst

Annapolis Junction, MD · On-site

Open Source Analyst ID: 1565 Location: Annapolis Junction, MD Department: Client Services More ... Written and verbal communication skills, to include presentation development for senior ranking ...

Akuity

Community Manager - Open Source

This is a senior individual contributor role with real autonomy and high visibility - both inside ... Work closely with engineering to surface community feedback, flag recurring pain points, and close ...

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Senior Open Source Developer information

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How much do senior open source developer jobs pay per year?

As of Sep 13, 2026, the average yearly pay for senior open source developer in the United States is $80,287.00, according to ZipRecruiter salary data. Most workers in this role earn between $41,500.00 and $103,000.00 per year, depending on experience, location, and employer.

What is the difference between Senior Open Source Developer vs Open Source Software Engineer?

AspectSenior Open Source DeveloperOpen Source Software Engineer
CredentialsExperience in open source projects, coding skills, possibly certifications in relevant technologiesSimilar credentials, often with additional focus on software engineering principles and certifications
Work EnvironmentCollaborates in open source communities, contributes to projects, often remoteWorks within organizations on open source projects or internal tools, may be part of a team
Industry UsageCommon in tech, software, and open source communitiesUsed in tech companies, startups, and organizations leveraging open source solutions

While both roles involve working with open source projects, a Senior Open Source Developer typically focuses on contributing code and leading community efforts, whereas an Open Source Software Engineer may work within a company to develop, maintain, and integrate open source solutions into products.

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Senior Open Source Developer jobs near you
Infographic showing various Senior Open Source Developer job openings in the United States as of September 2026, with employment types broken down into 1% Internship, 1% As Needed, 77% Full Time, 18% Part Time, and 3% Contract. Highlights an 90% Physical, 2% Hybrid, and 8% Remote job distribution, with an average salary of $80,287 per year, or $38.6 per hour.

Open Source Engineer - Python

New York, NY • On-site, Remote

Braintrust
See more jobs at Braintrustexternal

Full-time

Medical, Dental, Vision

Re-posted 19 days ago

Key responsibilities

  • Build and maintain open-source SDKs for AI observability and evaluation platforms.

  • Collaborate with cross-functional teams to ensure SDKs are easy to use, performant, and integrate with major AI providers and frameworks.

  • Engage with the community by supporting users, understanding their issues, and contributing to the SDKs' development and documentation.

Job description

About the company
Braintrust is the agent observability platform. By actively applying intelligence to agent traces and automatically surfacing the most critical patterns, Braintrust gives teams the visibility to understand how agents behave in production and the tools to improve them.
Teams at Notion, Stripe, Box, OpenAI, and Cloudflare use Braintrust to trace their agents, find the issues in their observability data, and run evals that tell them how to improve.
About the Role
We're hiring engineers to build the open-source libraries that customers use to observe, understand, and optimize how AI operates inside their production applications. These SDKs are a critical part of Braintrust's platform. They power evaluation and observability pipelines across a wide range of environments, frameworks, and AI providers.
This role is ideal for engineers who are passionate about developer experience, API craftsmanship, and building fast, reliable, and idiomatic libraries. You'll own the full SDK lifecycle: design, implementation, release, documentation, and community support. Your work will be embedded in thousands of applications and help define how AI is adopted and operationalized across industries.
What You'll Do
  • Build elegant, idiomatic, and resilient SDKs that power Braintrust's LLM evaluation and AI observability platform.
  • Ensure our libraries are easy to use, efficient to run, and a delight to work with, prioritizing developer experience and performance.
  • Integrate with major AI providers, frameworks, and platforms our customers rely on, such as OpenAI, Anthropic, and Gemini.
  • Build tools and automation to improve testing, profiling and simplify release workflows.
  • Collaborate closely with backend, platform, and product teams to ensure a cohesive and polished developer experience.
  • Be a great community ambassador: talk with our users, understand their issues, help them get their fixes merged and have deep empathy for our users.
You Might Be a Fit If You:
  • Are customer-obsessed and passionate about solving real-world problems for developers.
  • Have deep expertise in Python and understand what it takes to build fast, idiomatic, and reliable libraries in that ecosystem.
  • Are proficient with the tooling needed to build robust SDKs, such as testing frameworks, profilers, CI/CD pipelines, and packaging systems.
  • Care deeply about developer experience, from clean APIs and clear docs to thoughtful error handling and backward compatibility.
  • Know how to wrap, patch, or extend existing frameworks and SDKs to inject observability and control without breaking developer workflows.
  • Have experience maintaining or contributing to production-grade open-source libraries, ideally used across multiple environments.
  • Bonus: You've contributed to popular open source projects, led SDK adoption at your organization, are familiar with tracing and observability tools like OpenTelemetry, or worked on tools in the LLM/AI ecosystem.
Benefits include
  • Medical, dental, and vision insurance
  • Daily lunch, snacks, and beverages
  • Flexible time off
  • Competitive salary and equity
  • Wifi & cellphone stipend
Equal opportunity
Braintrust is an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status.

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