Senior software engineer

Rainbow Standard; Paris; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Competitive salary

Stock options

Office at Climate House, Paris

Startup culture

High responsibility and impact

Work-life balance

Job summary

Rainbow seeks a senior full-stack engineer to join its Product & Tech team in Paris. You will own features from problem to production, build data models, APIs, and AI-assisted workflows, and contribute to a carbon-aware platform.

You will work closely with climate and certification teams, shipping AI-enabled capabilities while maintaining code quality and scalable architecture in a startup environment.

Qualifications

• 7+ years of experience as a full-stack engineer, backend-leaning.
• Graduated from an engineering school with solid fundamentals.
• Comfortable with ownership, ambiguity and startup tradeoffs.
• Builds for customer needs beyond the ticket.
• Daily user of AI coding tools; building AI features is a plus.
• Familiar with TypeScript, Node.js, React; Python is a plus.
• Fluent in English; French is a plus.

Responsibilities

• Design & implement features end to end: data models, APIs, calculation logic.
• Ship the matching front-end where needed.
• Talk to users and turn their needs into product decisions.
• Raise the bar on code quality, architecture and AI-assisted workflows.

Skills

TypeScript

Node.js

React

Python

AI features

APIs

Data modeling

Frontend development

Ownership

English fluency

Education

Engineering degree

Job description

Join the team Senior Software Engineer Join Rainbow as a senior full-stack engineer on our Product & Tech team in Paris. Team Product & tech Job type Full Time Created 12/10/2026 Start date January 2027 Location Paris Application closing 15/11/2026 We’re looking for an experienced software engineer interested in putting their skills to use to fight climate change. You’ll help build and run the platform behind the Rainbow Standard: Arc (digital MRV and certification platform) and the carbon credit registry. You’ll work directly with climate and certification teams, own features from problem to production, and use AI daily to ship faster.

• Design & implement features end to end: data models, APIs, calculation logic
• Ship the matching front-end where needed
• Talk to users and turn their needs into product decisions
• Raise the bar on code quality, architecture and AI-assisted workflows

• You have 7+ years of experience as a full-stack engineer, backend-leaning
• You graduated from an engineering school, and have solid fundamentals
• You are used to ownership, ambiguity and tradeoffs of the startup environment
• You build for the customer need, not just what the ticket says.
• You are a daily user of AI coding tools. Having built AI features is a plus
• You’re familiar with our stack: TypeScript, Node.js, React. Python is a plus
• You’re fluent in English. French is a plus

• 15min introduction call with Kim
• 45min product deep dive with Clem
• 1h30 technical interview with Nathan and an engineer
• 30min cultural fit interview with two members of the team

Environment & Benefits

Competitive salary Based on your geography and experience, with a transparent salary grid. Stock options Attractive stock options package Convenient office location Our Paris office is at the Climate House in the center. Start-up culture High levels of responsibility and impact, and a strong emphasis on experimentation and innovation. Work-life balance We mean it Collaborative team spirit A close-knit, mission-driven team grounded in our Rainbow values .

Benefits For employees in France: 50% coverage for health insurance and transit pass, company participation to lunch expenses ("tickets restaurants") Team retreats Two annual team retreats, often outdoors or visiting project developers we work with

We are committed to fostering a diverse, equitable, and inclusive environment where everyone has the opportunity to thrive.

Inclusion is an ongoing journey that requires dedication, and we aim to create an authentic, welcoming space for all.

We celebrate individuality, embracing people of all nationalities, abilities, family structures, ages, socio-economic statuses, civil statuses, sexual orientations, gender identities, ethnic origins, religions, beliefs, and any other qualities that make their life experiences unique.

We are at the beginning of building our company and our culture, and are extremely interested to talk about these topics if you are interested too!