Open-source billing platform helping SaaS companies build flexible pricing models and scale with confidence.

Lago is revolutionizing SaaS billing with their open-source platform that prioritizes transparency, metering, and developer experience. Having raised over $22M from top investors, they're the leading open-source repository in the billing space with 7,000+ GitHub stars.

As an AI/ML Engineer at Lago, you'll be at the forefront of integrating artificial intelligence into their core billing product. You'll build and deploy ML-powered features, manage data pipelines, and ensure high-quality service delivery to customers. This role combines hands-on ML engineering with production system management.

The ideal candidate brings extensive experience in production ML pipelines and LLM-powered features. You should be proficient in Python, SQL, and modern software engineering practices, comfortable with Docker and AWS, and possess strong communication and problem-solving skills.

What makes this role exciting is the opportunity to:
- Work on a product beloved by engineers and product teams
- Join a lean, ambitious team building foundational infrastructure
- Contribute to an impactful open-source project
- Shape the future of billing technology alongside next-gen companies like Mistral.ai and Together.ai

The team values reliability, proactivity, and continuous learning. They encourage fast experimentation while maintaining high standards. If you're passionate about applying AI to solve complex business problems and want to grow with a high-performing team, this role offers the perfect blend of technical challenge and business impact.

Senior AI/ML Engineer position at Lago, building ML-powered features for their open-source billing platform.

AI/ML Engineer

Open Source Metering and Usage Based Billing

Lago is seeking a Support Engineer to join their Product team. This backend engineering role focuses on production-grade problem solving for real users, acting as the technical first responder for product and infrastructure issues.

The role bridges user success and product reliability, combining engineering, investigation, and maintenance responsibilities. You'll be writing code, reviewing logs, running local instances, reading database states, and helping move the product forward through real-world use.

Lago is the leading open-source billing platform, empowering businesses to build flexible pricing models and scale with confidence. With over $22 million in funding and 7,000+ GitHub stars, they serve next-gen companies like Mistral.ai, Together.ai, Groq, and Laravel.

The team values excellence, ambition, and accountability. They encourage fast experimentation while maintaining high standards for learning and improvement. The environment is perfect for those excited by challenges and eager to grow with a high-performing, supportive team.

Key Responsibilities:
- Debug and resolve complex support cases for production environments
- Reproduce issues locally and implement code fixes
- Contribute to the Lago codebase (Ruby, PostgreSQL, Sidekiq)
- Develop internal tools and improve support workflows
- Enhance system resilience based on user feedback
- Maintain documentation and postmortem processes
- Collaborate with Product and Engineering teams

Benefits include:
- Competitive salary and stock options
- Opportunity to shape the future of fintech
- Work with top-tier talent
- Direct impact on product development
- European time zone flexibility

Support Engineer role at Lago focusing on backend engineering, production support, and technical problem-solving for their open-source billing platform.

Support Engineer (Europe)

Open-source billing platform empowering businesses with flexible pricing models, backed by $22M funding and 7,000+ GitHub stars.

Lago is seeking a Forward Deployed Engineer to join their Product team, focusing on hands-on customer challenge resolution and implementation support. This role bridges customer needs with internal teams, combining technical expertise with customer-facing responsibilities.

The ideal candidate will lead technical implementations for strategic users, from architecture reviews to production deployment. They'll write integration code, contribute to open-source SDKs, and build internal tools while acting as a technical advisor to both internal and external stakeholders.

Key responsibilities include:
- Leading technical implementation efforts for strategic users
- Writing scripts and integration templates
- Contributing to Lago's open-source ecosystem
- Collaborating with user engineering teams
- Identifying and documenting implementation patterns
- Building internal tooling for deployment optimization

Requirements:
- 3+ years of Software Engineering experience
- Strong Ruby on Rails backend skills
- Proficiency with PostgreSQL, Docker, Sidekiq, and Clickhouse
- Experience with RESTful APIs, webhooks, and authentication flows
- Background in production environments and async processing
- Strong debugging and communication abilities
- Willingness to work from Paris office 3+ days weekly

Lago offers a unique opportunity to:
- Work on an engineer-loved product
- Join a lean, ambitious team building critical infrastructure
- Contribute to impactful open-source projects
- Receive competitive compensation and early equity

The company has raised over $22M in funding and serves next-gen companies like Mistral.ai, Together.ai, and Groq. Their platform has garnered 7,000+ GitHub stars, demonstrating strong community support and product validation.

Forward Deployed Engineer position at Lago, working on implementation support and customer technical solutions in Paris.

Forward deployed Engineer - Paris, France

Open-source billing platform empowering businesses to build flexible pricing models and scale with confidence. Raised over $22M in funding and has 7,000+ GitHub stars.

Lago is seeking an Infrastructure Engineer to join their team and help scale their open-source billing platform. This role combines DevOps expertise with platform engineering to ensure reliability and performance.

As an Infrastructure Engineer, you'll be responsible for owning and scaling Lago's infrastructure, ensuring high reliability, performance, and security. You'll work with modern tools like Terraform and Kubernetes to automate infrastructure provisioning, and optimize database performance for PostgreSQL and Clickhouse systems.

Key responsibilities include:
- Designing and implementing infrastructure automation using Terraform and Kubernetes
- Managing and optimizing database performance and availability
- Implementing robust monitoring and observability solutions
- Enhancing security practices across the infrastructure
- Collaborating with engineering teams on DevOps best practices

The ideal candidate brings:
- 5+ years of experience in infrastructure engineering or DevOps
- Strong expertise with Kubernetes, Terraform, and cloud platforms (AWS/GCP)
- Solid experience managing PostgreSQL in production
- Proficiency in Ruby or Go (or willingness to learn)
- Passion for open-source technologies
- Ability to work autonomously in a fast-paced environment

Lago offers an opportunity to:
- Make significant impact at a fast-growing open-source company
- Solve complex technical challenges in billing infrastructure
- Work remotely or from their Paris office
- Join a team of ambitious professionals focused on excellence

The company has raised over $22M in funding and serves next-gen companies like Mistral.ai, Together.ai, and Groq. Their platform has garnered over 7,000 GitHub stars, demonstrating strong community support and technical excellence.

Infrastructure Engineer position at Lago, focusing on scaling and maintaining the infrastructure for their open-source billing platform using Kubernetes, Terraform, and PostgreSQL.

Infrastructure Engineer

Lago is revolutionizing SaaS billing with their open-source platform, making it simpler, more transparent, and adaptable. As a Senior Frontend Engineer, you'll play a crucial role in scaling and maintaining Lago's Frontend App.

Your responsibilities will include ensuring reliability and performance, co-designing features with Product and Backend teams, maintaining the design system, and improving monitoring for frontend issues. This role offers significant impact as you'll be building the entire Frontend App for a fast-growing open-source company.

The ideal candidate brings 5+ years of frontend development experience, strong React expertise, and experience with design systems. Knowledge of GraphQL is a plus. You should be passionate about open-source, comfortable working autonomously, and proactive in driving projects to completion.

Lago has raised over $22M from top investors and serves next-gen companies like Mistral.ai, Together.ai, Groq, and Laravel. Their platform has garnered 7,000+ GitHub stars, demonstrating strong community support. The team values reliability, proactivity, and quick learning - embracing a "fail fast, learn fast" mentality while maintaining high standards.

Working at Lago means joining a high-performing, supportive team solving complex technical challenges. You'll help maintain a scalable design system while contributing to a product that's transforming how SaaS companies handle billing. The role offers flexibility to work remotely from anywhere in France or join the team in Paris.

Senior Frontend Engineer position at Lago, building and scaling the frontend app for an open-source billing platform.

Lago Engineering Jobs

Open-source billing platform helping SaaS companies build flexible pricing models and scale with confidence.