Senior Frontend Engineer

About Lago

The AI Native Billing Platform

Tech description:

- Back-end: Ruby, Postgres, AWS
- Front-end: .js, React, GraphQL, Typescript

Job description:

# **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** , **CoreWeave** , **Synthesia** and [**Mistral.ai**](http://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.

# **Overview**

We're looking for a Senior Frontend Engineer to own and scale Lago's frontend application. You'll work closely with our Product and Backend Engineering teams to build and ship high-quality features, maintain our design system, and ensure the frontend is reliable, performant, and consistent at scale.

# **What You'll Be Doing**

- Own and scale Lago's frontend app — reliability, performance, and feature delivery

- Co-design and build features with the Product and Backend Engineering teams

- Maintain and enhance our design system to ensure consistency across the app

- Improve monitoring and observability for frontend issues and bugs

- Work autonomously in a fast-moving environment and lead your topics to completion

# **Who You Are**

- 5+ years of experience in frontend development

- Expert-level React skills

- Experience managing and scaling design systems in production

- Comfortable working autonomously in a fast-paced startup environment

- Proactive and ownership-driven — you lead your topics to completion without needing to be chased

- A genuine interest in open-source or developer tools is a strong plus

# **Who You're Not**

- You're not someone who needs a fully scoped spec to start moving — you're comfortable with ambiguity and make progress anyway

- You're not siloed — you collaborate actively with Product, Backend, and Design and communicate clearly across teams

- You're not satisfied with "it works" — you care about performance, observability, and long-term maintainability

- You're not just a feature builder — you take pride in the systems and patterns that make the whole frontend better

# **Requirements**

- 5+ years of professional frontend engineering experience

- Strong expertise in React

- Experience building and maintaining design systems in production environments

- Solid understanding of frontend performance, monitoring, and observability

- Strong written and verbal communication skills

- A mindset of ownership, curiosity, and continuous improvement

**Nice to have**

- Proficiency in GraphQL

- Experience contributing to or supporting open-source projects

- Familiarity with developer tools or infrastructure products

- Exposure to billing, fintech, or data-intensive frontend applications

# **Why Join Lago?**

- **Work with top-tier talent** : Join a team that values excellence, ambition, and accountability

- **Shape the future of fintech** : Be part of a fast-growing company building the best open-source billing platform

- **Remote-friendly** : Work from anywhere in Europe

- **Competitive package** : Competitive salary and stock options

- **Make an impact** : Own the entire frontend of a product used by companies like PayPal, Synthesia, and [Mistral.ai](http://Mistral.ai)

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.

Location type: Remote

Primary Location: Remote Europe

Team: Product Engineering

Work Type: Full Time/Permanent Contract

Salary: 60,000-90,000 EUR

_(Applicants must be based in the location specified for this role. Applications from other locations will not be considered.)_