Senior Frontend Developer

Job description

Company Description

Are you passionate about energy, sustainability, and technology, with a drive to create impactful backend solutions?

Flexcity, a leading European energy tech company within the Veolia Group is looking for a resourceful Senior Frontend Developer to join our French team.

This position offers the opportunity to join the Flexcity R&D team in France , alongside a team of skilled colleagues from different backgrounds, within the company headquarters in Brussels.

 

At Flexcity, Tech is not a support function — it is a key business driver . We operate in a complex, real-time, and highly regulated environment, requiring robust, secure, and adaptable systems to manage the increasing volatility of energy markets.

 

Job Description

Role

As a Senior Frontend Developer you will play a pivotal role in crafting and elevating our user interfaces and web applications. You'll drive feature development while ensuring code excellence through thorough reviews and mentoring junior developers. Working closely with cross-functional teams, you'll contribute to our technical strategy and deliver robust, scalable frontend solutions that empower our platform to manage real-time energy flexibility across Europe.

 

You will be part of our tech team, under the UI Team Manager , and your role is divided in:

 

· 
Feature development & delivery - 60% 

· 
Implement complex UI features in React/TypeScript

· 
Collaborate with product teams

· 
Own user-facing experiences from idea to release

· 
Evaluate technical feasibility

· 
Align with backend teams

· 
Quality, reviews & mentorship - 30% 

· 
Conduct in-depth code reviews

· 
Ensure architectural consistency

· 
Uphold best practices in performance, accessibility, and typing

· 
Pair programming and guiding mid/junior engineers

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Onboarding new developers

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Write or maintain internal documentation and ADRs

· 
Tech strategy & cross functional collaboration - 10% 

· 
Design scalable UI architecture

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Enforce frontend patterns

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Lead structural refactors

· 
Improve build tools, linting, and CI pipelines

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Contribute to roadmap decisions

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Contribute to component documentation / mockups (Figma, Storybook)

Qualifications

Hard Skills

   Must Have 

 

· 
Fluent in English and French 

· 
Strong front-end development expertise

· 
Testing proficiency

· 
Architecture principles

· 
Component libraries & design systems

· 
Tooling & DX expertise

Nice to have

· 
UX sensibility

· 
DDD / Hexagonal Architecture

· 
Observability

Soft Skills

· 
Strong communication skills

· 
Leadership Skills

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Mentoring and knowledge sharing

· 
Problem-solving mindset

· 
Stakeholder management

· 
Meticulous attention to detail

· 
Product-oriented thinking

Additional Information

Why Join Flexcity?

 

Impact             Be part of our key Technology team, with a direct impact in the decarbonisation of our industry

Purpose             Contribute concretely to a greener future, both in France, and globally

Scale-up            Work in an agile environment, getting structured and more efficient, but still with a large                                    freedom and strategic decision making available at all levels of the company

Group                 Benefit from a close relationship with the Veolia group, a global leader in the ecological and                               energy transformation

Innovation          Engage with cutting-edge energy technology and markets

Supported          Get backing from dedicated central support teams in  Product and Portfolio, in order to                             get you the best tools, training and sounding board to work in the best environment

Community       Engage with a team spread across multiple countries, learning and innovating together.                                     Connect with diverse teams across Europe through regular team-building events, both                                       within  Flexcity and Veolia

Training             Develop your hard and soft skills with dedicated training made available, as well as strong                                learning curve within your position 

Hybrid               Experience international collaboration and flexible work schedules, including 2 work-from-                                  home days

 

About Flexcity

Flexcity is a uniquely positioned energy technology company in the Internet of Energy sector. It is a leading demand response aggregator in Europe, rapidly growing and expanding to new regions. Flexcity’s core activity consists of supporting the power grid balance through the operation of its large portfolio of flexible fully-automated assets. 

 

The Flexcity portfolio consists of a wide range of technologies such as batteries, eBoilers, CHPs, generators, wind farms, solar parks and large industrial processes. 

 

As a provider of smart energy management services based on innovative smart grid technology, Flexcity applications focus on demand-side optimization and management (Demand Response, Load Shifting, etc.). Flexcity supports many industrial companies in reducing their overall electricity costs by providing demand-side management services based on innovative optimization and modelling software applications.

 

Flexcity is truly at the cutting edge of energy innovation. As a member of the team, you will contribute to a sustainable low-carbon energy sector.

 

 

As an inclusive company, Veolia is committed to diversity and gives equal consideration to all applications, without discrimination.

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Job Location

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