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Jérôme C.JC

Jérôme C.

Senior Android Developer

€500/day
81 projects
Paris, FR
15+ years

Average response time: 1 hour

About Jérôme

Ingénieur Android senior avec plus de 15 ans d’expérience, j’interviens en freelance sur la conception, le développement et l’optimisation d’applications mobiles complexes.
J’accompagne mes clients sur l’ensemble du cycle produit : architecture, développement, performance, UX et publication.

Je maîtrise l’écosystème Android moderne : Kotlin, Jetpack Compose, Coroutines, Flow, Hilt, Room, Protobuf, Firebase, Clean Architecture et MVVM.
Mon approche repose sur un code clair, testable et durable, toujours orienté produit et utilisateur.

J’ai contribué à des projets d’envergure pour TAG Heuer (Wear OS, UI offload, capteurs sportifs) et conçu des applications grand public totalisant plusieurs centaines de milliers de téléchargements.
Formateur reconnu, j’ai également transmis mes connaissances Android et Kotlin à des équipes techniques et à des organismes de formation.

Mon objectif : livrer des applications élégantes, robustes et durables, alliant performance et qualité d’expérience.
  • French

    Native or bilingual

  • English

    Fluent

  • Spanish

    Native or bilingual

  • Catalan

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Trainline
    Senior Android Software Engineer
    TRANSPORTATION
    January 2026 - Today (6 months)
    Barcelona, Spain
    Developed and maintained the Trainline Android app, used by millions of travelers across Europe to search, book, and manage train and coach tickets. Built and shipped features across the booking funnel (search, payment, ticket delivery) in Kotlin, within a large-scale modular codebase. Contributed to the migration to Jetpack Compose and the modernization of the architecture (MVVM, Coroutines/Flow, DI). Collaborated in cross-functional agile squads with product, design, and backend teams, with a strong focus on quality (unit/UI testing, code reviews) and performance at scale.
    Architecture MVVM Kotlin
  • TAG Heuer
    Senior Android Software Engineer
    August 2021 - November 2025 (4 years and 3 months)
    Paris, France
    Contributed to TAG Heuer’s Wear OS and mobile companion apps, with full ownership
    on several strategic features. Collaborated closely with product, design, QA, and
    hardware teams to deliver robust, user-focused experiences on constrained devices.
  • Gaming Campus
    Android software engineer
    March 2019 - December 2019 (9 months)
    Development of the Gaming Guru application, a platform for private lessons and video training to learn to play video games thanks to the advice of professional players. The application allows you to view your courses and validate your skills.

Reviews

4,9

Out of 49 ratings

J

Jérôme

JD CONSEILS

Reviewed on 17/11/2020

Parfait !!! Comme toujours

Jérôme has chosen to hide 5 reviews

5 written reviews are private.

Recommendations

FU
RD
FU
+6
Former user and 8 other people have recommended Jérôme

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Education

  • Tech2
    EPITECH
    2011
  • Master of Science
    SUPINFO
    2014

Certifications

Skill set

Categories