About 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 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, 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.
The Role
We’re hiring a Forward Deployed Engineer to join our Sales team.
This role is ideal for engineers who enjoy solving real-world customer challenges hands-on. You’ll work directly with users to support their implementation of Lago, guide them through architectural and product decisions, and build or adapt code that helps them succeed.
You’ll act as a bridge between the user and Lago’s internal teams — writing production-level code, improving onboarding assets, supporting complex integrations, and channeling user feedback directly into our product development cycle.
Responsibilities
Lead technical implementation efforts for strategic users — from initial architecture reviews to production deployment
Write scripts, integration templates, and lightweight services to support custom use cases
Contribute to Lago’s open-source SDKs, example repositories, and public documentation
Collaborate with users’ engineering teams to resolve complex integration challenges
Identify edge cases and implementation patterns, and feed them into product discussions
Build internal tooling and utilities that support faster and more robust deployments
Act as a hands-on technical advisor to both internal and external stakeholders
Requirements
3+ years of experience as a Software Engineer or in a technical role working with external users
Strong backend skills, especially in Ruby on Rails
Comfortable with PostgreSQL, Docker, Sidekiq, Clickhouse and event-based or asynchronous processing
Familiarity with RESTful APIs, webhooks, authentication flows, and OpenAPI specifications
Experience working with background jobs, queuing systems, and production environments
Excellent debugging and communication skills
Bonus: experience in billing infrastructure, SaaS metering, or open-source development
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.