Job ID REF48743P Date posted 08/12/2025 Location France Category IT Design & DevelopmentSenior Frontend DeveloperCompany DescriptionAre 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 DescriptionRoleAs 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/TypeScriptCollaborate with product teamsOwn user-facing experiences from idea to releaseEvaluate technical feasibilityAlign with backend teamsQuality, reviews & mentorship - 30%Conduct in-depth code reviewsEnsure architectural consistencyUphold best practices in performance, accessibility, and typingPair programming and guiding mid/junior engineersOnboarding new developersWrite or maintain internal documentation and ADRsTech strategy & cross functional collaboration - 10%Design scalable UI architectureEnforce frontend patternsLead structural refactorsImprove build tools, linting, and CI pipelinesContribute to roadmap decisionsContribute to component documentation / mockups (Figma, Storybook)QualificationsHard SkillsMust HaveFluent in English and FrenchStrong front-end development expertiseTesting proficiencyArchitecture principlesComponent libraries & design systemsTooling & DX expertiseNice to haveUX sensibilityDDD / Hexagonal ArchitectureObservabilitySoft SkillsStrong communication skillsLeadership SkillsMentoring and knowledge sharingProblem-solving mindsetStakeholder managementMeticulous attention to detailProduct-oriented thinkingAdditional InformationWhy Join Flexcity?Impact Be part of our key Technology team, with a direct impact in the decarbonisation of our industryPurpose Contribute concretely to a greener future, both in France, and globallyScale-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 companyGroup Benefit from a close relationship with the Veolia group, a global leader in the ecological and energy transformationInnovation Engage with cutting-edge energy technology and marketsSupported 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 environmentCommunity 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 VeoliaTraining Develop your hard and soft skills with dedicated training made available, as well as strong learning curve within your positionHybrid Experience international collaboration and flexible work schedules, including 2 work-from- home daysAbout Flexcityis 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.Save for Later Job ID REF48743P Date posted 12/08/2025 Localisation Colombelles, France Job IT Design & Development Contract type StandardShareVEOLIA CaresThe new global benefits program that ensures the health and well-being of our employees.Veolia, a learning companyExpand your professional skills with Veolia, a learning company.Recruitment processNo previously viewed jobsSign up for our job alertsStay informed by subscribing, receive the latest job offers by email.Email Address Interested InSearch for a category and select one from the list of suggestions. Search for a location and select one from the list of suggestions. Finally, click “Add” to create your job alert.Job categoryLocationContract type Add
IT Design & Development, Colombelles, Normandy, France
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