At Lago, we’re on a mission to make billing simpler, more transparent, and more adaptable for SaaS companies.

As the leading open-source billing platform, we empower businesses to build flexible pricing models and scale with confidence. We’ve raised over $22 million in funding from top-tier investors, reflecting strong confidence in our vision and growth.

Our platform has garnered over 7,000 stars on GitHub, a testament to our active and growing developer community. Next-gen companies such as Mistral.ai, Together.ai, Groq, and Laravel chose Lago for their billing.

We’re a team of ambitious, focused individuals who work together to solve hard problems with excellence and accountability. At Lago, we value reliability and proactivity—we trust each other to own tasks, drive them to completion, and adapt quickly. While we encourage you to try fast and “fail fast”, we also expect you to learn fast: make mistakes, but don’t make the same one twice.

If you’re excited by challenges and want to grow alongside a high-performing, supportive team, this is the place for you.

What You’ll Do

• Build AI and ML-powered features related to Lago’s core billing product
• Operate services in production to ensure high value delivered to our customers
• Manage databases and data pipelines so that we have high quality data feeding into our ML and AI services
• Help foster best practices around ML, AI, and data.

What We’re Looking For

• Extensive experience building and deploying to production end-to-end machine learning pipelines
• Experience building LLM-powered features, especially with AI agents
• Proficiency in Python, SQL, and modern software engineering principles
• Comfortable with Docker, AWS, git, AI-powered IDEs
• Soft skills:
  • Great communication skills
  • Problem-solving mentality
  • A sense of ownership
  • Ability to work autonomously

Bonus Points

✅ Demonstrable involvement with open-source projects

✅ Prior experience working for fast-moving start-ups

✅ Prior experience and knowledge in fintech

Why Join Lago?

• Work on a product loved by engineers and product teams
• Join a lean and ambitious team building foundational infrastructure
• Contribute to an open-source project with real-world impact
• Competitive compensation and early equity in a fast-growing company

Ready to Build with Us?

If you’re excited about joining a high-talent team to solve meaningful problems and help businesses thrive, we’d love to hear from you. Apply today and let’s build something remarkable—together.

• Back-end: Ruby, Postgres, AWS
• Front-end: .js, React, GraphQL, Typescript