Senior Back-end Ruby Engineer

Lago is the open-source platform that helps engineers build better monetization systems. We enable software teams to build customizable and scalable usage metering, subscription management, billing, invoicing, and payment systems.
Lago is the leader of our category on Github (5k+ stars), won « Product of the month » on ProductHunt, and is used by leading companies such as Mistral, Together, Swan, Juni, Fintecture, JuliaHub, Regate, Flipside Crypto, Unifonic, Vida.id , Bureau.id, Sortium.
Lago’s founding team previously built and scaled the home-grown monetization system of fintech unicorn Qonto from pre-launch to series D.
We're a lean, ambitious team of 12 today, and we're all about Product, FinTech and Open Source.
Our Product is really tech-driven, as we process and structure a lot of data, and build for developers so we have numerous exciting back-end challenges!

What you'll do

• Contribute daily to all parts of our code base, using our development workflow
• Tackle a wide variety of technical problems throughout the stack
• Help grow the back-end team
• Work with out Product Team, and our Front-end Engineers to understand customer needs and challenges
• And come up with technical solutions to create and improve the best features, and our architecture

The ideal candidate will have

• Strong knowledge of Ruby (at least 6 years hands-on experience)
• Experience working with lots of data and event-driven environments
• A genuine passion for Open-Source: if you’ve contributed to OSS projects or used OSS tools, let us know!
• Bonus: you’ve worked on billing or tax projects: whether it was to implement a billing system, or maintain it, or integrate it with business tools (e.g., a CRM, Finance tools)
• A real appetite for the early stages of co-creating a product and shaping Lago's future

Learn more how we think and work
Open-source does not win by being cheaper Post-mortem of our 1st YC startup: a Reverse ETLHow soon should you have a design system?How we ship fast: our framework
Our Values
Ambition: we aim big, because otherwise, where is the fun?Progress: we care more about the grit, the steep learning curve, the resilience and creativity muscles, than the current status or where you come from.Humble confidence: we know our strengths and always strive for excellence, but we also know there’s so much we don’t know yetPay it forward: we’ve all started somewhere, people gave us a hand when we needed one, we don’t forget this, and reinforce this positive cycleNot taking ourselves too seriously: we are ambitious, restless learners and hustlers, but at the end of the day, our health (physical and mental), and our loved ones are what matter the most.