Full-Stack Developer React / Kotlin
About the job
- Solid backend development experience with Java or Kotlin, with very strong Kotlin proficiency and mastery of or marked interest in React.
- Knowledge of Kotlin backend frameworks such as Spring Boot, Ktor, or similar.
- Knowledge of React and TypeScript or JavaScript.
- Proficiency in end-to-end, integration, and unit testing strategies.
- Design and develop complete features with significant functional and technical impact.
- Develop robust and scalable APIs in Kotlin.
- Integrate and enhance modern user interfaces in React.
- Understand business objectives and help translate them into concrete technical features.
- Evaluate and anticipate the impact of changes on external customers and internal business teams.
- Establish end-to-end, integration, and unit testing strategies to ensure platform stability and resilience.
- Participate in integrating and deploying services in an AWS cloud environment.
- Deliver production-ready product features across Kotlin backend and React frontend.
- Produce documented, tested, and maintainable APIs.
- Prepare test strategies, test cases, and integration/end-to-end test reports.
- Knowledge of the AWS ecosystem and CI/CD practices.
About the company
NEXTON plans and builds digital projects for large French companies and online businesses, combining digital strategy with software development and marketing. Its teams cover product management, user-experience design, agile delivery and data work, and build websites, mobile applications and customer communications. Clients pay for specialist consultants assigned to their teams or for projects delivered by NEXTON's own agency. The agency combines designers, developers and marketing specialists to handle projects from planning and interface design through development and delivery. Founded in Paris in 2011, NEXTON is headquartered there at 5-7 rue Saint-Fiacre and operates across France.
Company Size
N/A
Company Stage
N/A
Total Funding
N/A
Headquarters
Paris, France
Founded
2011
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Simplify's Take
What believers are saying
- NEXTON recruits entirely on permanent employment contracts, providing a salaried path into client assignments.
- NEXTON consultants joined client Veolia at Google's enterprise-AI event in March 2026, studying tools alongside customer teams.
- NEXTON's client portfolio spans rail, telecom and insurance through SNCF, Orange and AXA.
What critics are saying
- NEXTON's Montpellier Java role pairs new banking features with incident analysis and corrective maintenance, per October 2026 posting.
- French demand exposure: Numeum reported 1.8% contraction for 2025 IT services in December 2025; NEXTON's six offices are French.
- NEXTON's Paris customer marketing lead handles mobile campaigns and supervises an apprentice, per its October 2026 posting.
What makes NEXTON unique
- NEXTON runs an in-house digital factory in rural Saint-Augustin, extending project delivery beyond metropolitan offices.
- Figma lists NEXTON as a service partner for design-system implementation, migration and team training.
- NEXTON's seven employee-run communities connect mentoring, software, design, AI/data, sustainability, agile product work and sport.
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Benefits
- Commuter Benefits
- Professional Development Budget