Open Source Developer

Pydantic Services Inc.; United Kingdom; Remote; GBP 50,000 - 90,000

Job description

As an Open Source Developer, you'll have the opportunity to work on both Pydantic and PydanticAI, helping shape the future of these projects. You'll be deeply involved in the development, maintenance, and community aspects of our open source initiatives, working directly with the core team to improve and expand our ecosystem. You'll help build the tools that are redefining how developers harness Generative AI, creating impact that scales across millions of projects worldwide.

What you will do

• Contribute to the core development of Pydantic and PydanticAI
• Review and manage pull requests from the community
• Write and maintain documentation and examples
• Engage with the community through GitHub discussions, issues, and other channels
• Participate in the design and implementation of new features

Who You Are

We expect a candidate for this position to have:

• Strong Python development experience with a deep understanding of type hints and modern Python features
• Experience contributing to open source projects
• Excellent communication skills and experience working with developer communities
• Strong understanding of software testing and documentation practices
• Experience with Git and GitHub workflows
• Familiarity with CI/CD practices and tools
• A genuine interest in how modern applications are evolving to leverage Generative AI

Nice to haves but not required:

• Knowledge of Rust or interest in learning it
• Experience with technical writing or developer advocacy
• Experience maintaining open source projects
• Background in building developer tools
• Experience with performance optimization

Some non-technical requirements:

• Live and work in a timezone between PT (UTC-8) and CET (UTC+1)
• Able to travel to EU, UK and US up to 3 times a year to join our off-sites

Our current stack includes:

• Python (primary language)
• Rust (for performance-critical components)
• TypeScript (for the Logfire frontend)
• GitHub for version control and community management
• Various testing frameworks and tools
• Documentation tools and static site generators
• CI/CD pipelines for automated testing and deployment

About Us

Pydantic is the data validation library that powers modern Python development - 300 million downloads per month, used by virtually every tech company you've heard of. Why? Because we obsess over developer experience and write code we'd actually want to use ourselves.

We're applying that same engineering mindset to Logfire, our observability platform built for today's development reality: AI workloads, multi-language environments, and cloud infrastructure that's designed to be straightforward to set up and maintain.

We build with technologies developers actually want to work with:

• OpenTelemetry for standardized instrumentation
• SQL for intuitive querying (no proprietary query language to learn)
• Rust, Python, and TypeScript for performance and productivity
• Postgres, DataFusion, and object storage for scalable backends

Unlike other companies that pay lip service to open source, we commit over 20% of our engineering team to maintaining and expanding our open source ecosystem. This includes the core Pydantic library and PydanticAI - our rapidly growing framework that's becoming the standard for AI application development. We're signatories of the open source pledge and build on open standards because we believe in interoperability, not lock-in. Use our OpenTelemetry-based SDK with any compatible backend - we're confident you'll choose us on merit.

We're backed by Sequoia Capital and run a fully remote team across multiple time zones (with regular in-person offsites - next one's this May).

Join our team of exceptional engineers who value substance over hype, practical approaches over perfectionism, and meaningful progress over busyness. We've built a culture that balances technical ambition with sustainable practices—minimal meetings and respect for your expertise and time. We're creating tools that genuinely improve developers' lives, and we're looking for thoughtful contributors who share our commitment to quality and our passion for elegant solutions.

• Compensation: Competitive salary and stock options
• Truly Remote: Work from anywhere within our timezone range - no office requirements ever
• Global & Diverse: Join a multi-cultural team of 8+ nationalities
• Impact: Direct influence on tools used by millions of developers worldwide
• Focus on Growth: Regular opportunities for learning and professional development
• Team Gatherings: Connect with the team at our regular international off-sites
• Healthcare: Comprehensive health coverage for you and your dependents
• Flexible Hours: Work when you're most productive
• Equipment: Budget for your home office setup
• ️Work-Life Balance: flexible working hours and 33 days PTO no matter where you live (including public holidays, which you can choose to take or not)

No recruiters or agencies please. Unsolicited recruiters will be marked as spam.