Senior Full-Stack Software Engineer

Location: Remote (France/EU time zone)

Type: Full-time (CDI or equivalent)

Industry: Eco SaaS / Life Cycle Assessment / Cosmetics Sustainability

English required; French preferred

About Fairglow

Fairglow is building the next generation of ecodesign software for the cosmetics industry. Our SaaS platform helps brands measure and reduce the environmental impact of their products from raw ingredients to packaging using the power of Life Cycle Assessment (LCA) .

We combine data science, sustainability expertise, and intuitive UX to bring LCA out of the consulting world and into the hands of decision-makers.

About the Role

We’re looking for a Senior Full-Stack Software Engineer to help shape the core architecture and roadmap of our product. You’ll work across the stack building robust features, managing scalable systems, and helping bring scientific data to life through powerful interfaces.

This is a key role on a small, high-trust team. You’ll be involved in everything from architecture and implementation to troubleshooting and client feedback loops. We’re looking for someone who’s experienced, pragmatic, and excited to build meaningful tools that support sustainability.

What You’ll Do

• Develop and maintain features across the stack (TypeScript, React, Python, FastAPI, databases)
• Help define and evolve our product architecture, data pipelines, and deployment processes
• Set and uphold quality standards across codebases, testing, and documentation
• Effectively manage offshore development resources and integrate their contributions
• Leverage AI-assisted tools to accelerate development and improve productivity
• Collaborate closely with product, science, and sales teams to deliver features that users love
• Participate in client-facing projects, with occasional debugging and problem-solving support

First 30 Days

• Onboard to the product, tech stack, and core LCA workflows
• Ship improvements and fixes while learning project architecture
• Join client conversations to understand real-world usage and edge cases

First 90 Days

• Lead architectural improvements to support scale and flexibility
• Establish dev workflows that support efficient use of offshore and AI resources
• Contribute significantly to a key product milestone or launch
• Collaborate cross-functionally to scope and design impactful new features

Why Join Us?

At Fairglow, you’ll work on real problems that matter helping top cosmetic brands reduce their environmental footprint. You’ll join a small, high-impact team with the autonomy to make decisions, build fast, and leave your mark on a meaningful product.