Software Engineer Node/React

About the role

You join client teams fully, yet stand beside our engineer community. Daily practice of top methods and constant guidance shape your work. You own complex digital products from first line to live usage.

Key facts

What you'll do

Guiding legacy code toward current standards while enabling stability, maintenance, and future growth through full migration.

Launching a viable product within weeks under intense conditions by mastering design, development, verification, and live deployment.

Creating sophisticated React / Next.js interfaces while respecting distinct brand redesign rules and business targets.

Working with limited direction, engaging directly with product and business teams when internal technical guidance is missing.

Running e commerce transformation for major events, ensuring massive traffic handling before peak public demand.

Rebuilding critical financial tools using modern languages to strengthen startup analysis and investor decision accuracy.

Joining a small, agile group delivering real products, constant learning, and personal coaching from senior staff.

Influencing product direction and platform evolution, taking responsibility for outcomes and shaping long term strategy.

Meeting strict timelines for public launches, coordinating migrations, payments, and traffic management via cloud services.

Establishing reliable systems that scale across multiple markets, tracking success through traffic and stability indicators.

Requirements

You must possess three or more years using Node.js and React.js in production environments.

You approach problems with curiosity, independence, structure, and perspective on your own contributions.

You prefer a setting where technology drives value creation instead of rigid ticket processing.

You enjoy sharing knowledge, learning, improving skills, and helping peers advance their capabilities.

You seek a growing journey from day one, where your actions create meaningful impact.

Skills & tools

Only names that appear in SOURCE. Omit the section if none.

Practical notes

Only real constraints from SOURCE (hours, travel, visa if stated). Omit the section if none. Never write that Theodo accompanies innovative companies in designing, developing, and deploying digital products using technology and Lean approaches. Theodo Extend is a new entity created to address client needs for product management autonomy while integrating high level developers. In 2024, collaboration involved over 100 clients including Carrefour, Dior, and Yves Saint Laurent, with 63 experts mobilized. In 2025, the group generated 100 million euros in revenue. Theodo has grown for 15 years, employing more than 850 engineers focused on technology and continuous improvement.

Examples of missions include the e commerce refactoring for Decathlon ahead of the 2024 Olympics in the UK. The team built a Next.js and ReactJS based solution with Strapi, designed for high traffic absorption. Key deliverables involved CMS migration, payment application development, and intelligent routing via Cloudflare Workers. The project achieved on time deployment across six countries, increased traffic by 10 percent during the Games, and prevented major production incidents.

Another example is the critical application rebuild for IRIS Capital, shifting from Ruby to Python. The work included cleaning a database by a factor of 150, creating a Chrome extension with Vue 3, and establishing a new API to streamline communication with investors. The objective was to make the tool faster, more reliable, and automated, directly impacting investment decisions.

Theodo Extend is a young, agile, and selective entity offering real product work in demanding contexts. You will be part of a recognized engineering community that exchanges ideas, challenges each other, and progresses together. Continuous training is provided through formats such as Brown Bag Lunches, Dojos, individual coaching, and technical communities covering Node.js, ReactJS, DevOps, and AI. You are encouraged to remain immersed in the excellence culture, with at least one day per week in office spaces. You can help shape the offer and influence the direction of the entity.

The interview process spans two weeks and consists of five steps. It begins with a qualification call with Thomas, the recruitment manager. This is followed by a deeper recruiter interview with Thomas, a refactoring interview, a technical interview, and a final interview with Alexandre, the CEO.