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About LagoAt 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 including Y Combinator and FirstMark, reflecting strong confidence in our vision and growth. Our platform has garnered over 9,000 stars on GitHub, a testament to our active and growing developer community. Companies such as PayPal, CoreWeave, Synthesia and Mistral.ai choose 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.OverviewWe're looking for a Senior Backend Ruby Engineer to contribute to Lago's core product and help scale our open-source billing infrastructure. You'll work across the full backend stack, collaborate closely with Product and Frontend, and help shape how we build and evolve the platform.What You'll Be DoingContribute daily to all parts of our codebase, using our development workflowTackle a wide variety of technical problems throughout the stackHelp grow the back-end teamWork with our Product Team and Front-end Engineers to understand customer needs and challengesCome up with technical solutions to create and improve our best features and architectureWho You AreStrong knowledge of Ruby (at least 6 years hands-on experience)Experience working with large volumes of data and event-driven environmentsA genuine passion for Open-Source: if you've contributed to OSS projects or used OSS tools, let us know!A real appetite for the early stages of co-creating a product and shaping Lago's futureBonus: you've worked on billing or tax projects — whether implementing a billing system, maintaining it, or integrating it with business tools (e.g. a CRM, Finance tools)Who You're NotYou're not looking for a "just ship it" culture without quality standards — we care deeply about both speed and craftsmanshipYou're not someone who works in silos — you actively collaborate with Product, Frontend, and your fellow engineersYou're not intimidated by ambiguity — early-stage problems don't always come with a clear spec, and you're comfortable navigating thatYou're not allergic to context-switching — in a lean team, priorities shift and you adapt without losing momentumRequirements6+ years of hands-on experience in software engineering, with strong Ruby expertiseExperience working with event-driven systems and high-data-volume environmentsFamiliarity with background job frameworks (e.g. Sidekiq) and message queuesComfort with REST APIs, webhooks, and data integrationsStrong written and verbal communication skillsA mindset of ownership, curiosity, and resilienceNice to haveExperience contributing to or supporting open-source projectsFamiliarity with billing systems, fintech, or developer toolsExperience with PostgreSQL, Redis, Kafka, or similar infrastructureExposure to containerised environments (Docker, AWS, CI/CD)Why Join Lago?Work with top-tier talent: Join a team that values excellence, ambition, and accountabilityShape the future of fintech: Be part of a fast-growing company building the best open-source billing platformCompetitive package: Competitive salary and equity for employees based in FranceMake an impact: Your work directly shapes the product used by companies like PayPal, Synthesia, and Mistral.aiReady 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.(Applicants must be based in the location specified for this role. Applications from other locations will not be considered.)
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