Mobile Developer – Java/Kotlin/Swift (M/F)

Caen / Partial remote work possible
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The company

Dejamobile is a Fintech whose mission is to provide simple and secure mobile payment solutions for the benefit of all. Our clients are major payment players;, banks, Fintechs, merchant service providers . We offer our solutions on a global scale; international development is at the heart of our objectives with the ambition to become the leader in digital payment solutions.In October 2021, Dejamobile hjoined the Market Pay Group, a leading pan-European fintech in omnichannel payment services, to boost the development of its products and activity. 

At dejamobile, our teams are continuously revisiting their working practices and tools and decide in an agile and collegial way, to implement them.. We are looking for enthusiastic talents who are keen to participate in the realisation of Dejamobile’s ambitions. As part of a supportive team, you will enjoy a friendly and dynamic working environment, while taking advantage of the sporting and natural environment that Caen-la-Mer offers. 

As with all of the company’s positions, this position is open to people with disabilities. 

This position is to be filled at our Hérouville-Saint-Clair site. 


  • Partial remote work  possible (remote working charter in place within the company) 
  • Integration and training programme adapted to your needs 
  • Remuneration consisting of a fixed salary and a variable salary (range between 40 and 48K depending on profile) 
  • Mutual insurance 100% covered by the employer (individual and family) 
  • Luncheon vouchers (60% paid by the company) 
  • Holiday vouchers (up to €450 with the company paying between 50% and 75% depending on family composition) 
  • Group sports and wellness activities financed by the company 


As a member of the Mobile team, you will contribute to software product development projects and implementation projects for Dejamobile’s customers. You will be responsible for the design, development, quality and support of your software in an Agile environment, with continuous integration and deployment. 

You will be supported on a daily basis by Ludovic, Tech Lead of the Mobile team. The mobile team currently has a dozen employees who are proud to see their developments deployed on Apps used by millions of users (of which you are certainly one!) The missions of a mobile developer are diverse and challenging. Want to know more? Here’s what we offer: 

Architecture and Specifications: 

You participate in the needs analysis phase. 

You will write the specifications according to the selected methods. 

You will carry out feasibility studies as part of our R&D. 

Development, integration and testing: 

  • You will carry out the development of models, prototypes and commercial products. 
  • You will be responsible for implementation and integration up to production start-up. 
  • Advice, expertise and technical assistance: 
  • You will assist and advise clients. 
  • You provide technical support during the various phases of projects. 
  • You will also provide technical assistance at the client’s premises on an ad hoc basis. 
  • R&D and monitoring: 
  • You will follow the technological trends in dejamobile’s sector of activity and contribute to the R&D programme. 

Technical environment 

  • Whitebox cryptography: C, Java Native Interface, Obfuscation 
  • SDK: Java/Kotlin, Swift, EMV, HCE, eSE, Obfuscation 
  • Application : Kotlin, Jetpack, MVVM, Proguard ( Obfuscation ) 
  • Testing : Espresso, CI/CD 


Engineer by training – or BAC+3/5 with minimum 5 years of experience – in IT, you have developed a strong interest in the technological innovation process and experience in the development of mobile services and applications. 

Knowledge : 

Android development at Dejamobile is done in Java and Kotlin. Skills in Swift applied to iOS are also appreciated. 

You know how to work with software security issues and how to protect mobile applications against malicious attacks. 

Knowledge of standards and technologies in the field of transactions and payment (EMV, VISA, MASTERCARD…) is a plus.  

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