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 8,000 stars on GitHub, a testament to our active and growing developer community. Next-gen companies such as Mistral.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.

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, reflecting strong confidence in our vision and growth. Our platform has garnered over 8,000 stars on GitHub, a testament to our active and growing developer community. Next-gen companies such as Mistral.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.

Overview

At Lago, Forward-Deployed Engineers (FDEs) are engineers embedded with customers. They build, integrate, and optimize Lago in production environments: ensuring adoption, scalability, and impact. This role blends engineering depth with delivery ownership and customer collaboration.

You’ll write code, deploy systems, and translate real-world use cases into product-ready insights.

FDEs are not part of the reactive support queue, and they’re not isolated in core product development. They sit at the intersection of engineering and delivery: the engineers who turn product flexibility into customer success.

What you’ll be doing

• Own technical delivery for Tier 1 customers: from architecture design to deployment.
• Build custom integrations, connectors, and workflows using Lago’s Ruby on Rails APIs, React, and TypeScript stack.
• Design data ingestion pipelines and automation scripts (PostgreSQL, Redis, Kafka).
• Configure and optimize billing, metering, and event processing setups tailored to customer environments.
• Collaborate with Support Engineers on reliability handoffs and Core Engineering on product extensions.
• Write reusable code, documentation, and best-practice templates for future implementations.
• Surface recurring patterns or feature gaps to Product and Engineering for roadmap input.
• Mentor customer teams on Lago’s architecture, SDKs, and deployment patterns.

Who you are

• A software engineer who thrives in hands-on, customer-facing environments.
• Experienced in Ruby on Rails, React or both.
• Enjoys designing integrations, data pipelines, and technical architectures.
• Communicates clearly, balancing technical detail with customer empathy.
• Resourceful and comfortable navigating ambiguity.
• Eager to work across code, delivery, and customer experience.

Who you’re not

• You’re not part of reactive support queues: you plan, build, and deliver.
• You’re not detached from customers: you embed and advise.
• You’re not limited to writing specs: you ship and document your work.
• You’re not chasing short-term fixes: you design systems that scale.

Requirements

• 6+ years of experience working closely with APIs and SDKs (in Ruby/React would be a bonus but can be multiple languages)
• Deep understanding of REST APIs, authentication, and integration patterns.
• Strong SQL and data modeling skills (PostgreSQL, Redis, Kafka a plus).
• Experience designing and deploying production-ready integrations.
• Excellent written and verbal communication skills for both technical and non-technical stakeholders.
• Proven ability to manage delivery timelines and coordinate across teams.

Nice to have

• Experience in technical consulting, professional services, or customer engineering.
• Familiarity with Terraform, Docker, or CI/CD environments.
• Background in billing, payments, or developer platforms.
• Prior contribution to open-source or customer-led product delivery.

Growth path

• Technical: Senior → Core Engineering / Product Architecture.
• Cross-functional: Product Manager.
• Leadership: FDE Lead → Head of Professional Services / Customer Engineering.

FDEs form the bridge between engineering and real-world adoption: turning technical capability into customer outcomes.

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