Senior Frontend Engineer (FR) at Lago

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.

• Own and scale Lago’s Frontend App to ensure reliability, performance, and feature release.
• Co-design and build features with the Product and Backend Engineering Teams.
• Maintain and enhance our design system to ensure consistency within the app.
• Improve monitoring and observability for frontend related issues and bugs.
• Strong experience in Frontend Development: 5 year+.
• Strong expertise in React.
• Proficiency in GraphQL is a plus.
• Experience managing and scaling Design Systems in production.
• Passion for open-source and infrastructure-as-code principles.
• Ability to work autonomously in a fast-moving startup environment.
• Be proactive and lead your topics to completion. Bonus Points

✅ Experience with open-source projects or developer tools.

🔥 Impactful role: Build the entire Frontend App for a fast-growing open-source company.

💡 Technical challenges: Solve complex features and maintain a scalable design system.

🌍 Remote-friendly: Work from anywhere in France or join us in Paris.

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