Open Source Developer

About the Role

Mail Tactic is building first-class SDKs for the languages developers actually use — Python, Java, PHP, TypeScript, and JavaScript. As an Open Source Developer on the Developer Experience team, you will own those libraries end-to-end: from API design and implementation to documentation, community engagement, and release automation.

This is a part-time, fully remote role. You will work autonomously on a small, focused team that cares deeply about the quality of what developers integrate into their applications.

What You’ll Do

• Build and maintain official Mail Tactic SDKs across Python, Java, PHP, TypeScript, and JavaScript
• Design clean, idiomatic interfaces that feel native to each language and its ecosystem
• Write comprehensive documentation, guides, and real-world integration examples
• Triage issues and pull requests in public repositories; engage with external contributors
• Develop and maintain CI/CD pipelines for automated testing, versioning, and package publishing
• Collaborate with the API team to surface integration pain points and shape the developer experience
• Contribute to open standards and participate in the wider developer community on behalf of Mail Tactic

What We’re Looking For

• 3+ years of software engineering experience with at least two of: Python, Java, PHP, TypeScript, JavaScript
• Experience publishing and maintaining open-source libraries or packages
• Strong written communication skills — your code and your prose will both be read by thousands of developers
• Comfortable working async and independently, with minimal hand-holding
• A genuine interest in helping other developers succeed

Nice to Have

• Experience with email protocols or transactional email systems (SMTP, webhooks, deliverability)
• Familiarity with package ecosystems: PyPI, Maven Central, Packagist, npm
• Prior experience writing technical documentation or developer tutorials
• Contributions to notable open-source projects

What We Offer

• Fully remote, async-first — work from anywhere
• Flexible part-time hours, no core hours required
• Annual learning budget
• Direct impact: your SDKs will be used in production by developers worldwide