Senior Java Payment Specialist - Montpellier - H/F
Core
Senior Backend Engineer specializing in payment systems and logistics for Free Mobile's 23 million subscribers, focusing on the Banque ONE project and order management.
Role type
Senior IC Java Backend Engineer (Payments & Logistics)
Builds
Robust payment APIs, logistics order management systems, and high-availability transaction platforms for mobile and fixed-line services.
Domain
Telecom / Fintech / Payments
Deliverable
production ML models | product features
Required skills
Java (Senior), Spring Boot, REST/SOAP API design, MySQL, Hibernate/JPA, Distributed systems, Observability, Unit/Integration/E2E testing
Preferred skills
Experience with 3D Secure, SEPA/Iban, PSP integrations, Wero, High-throughput environments
Technologies
Java 25, Spring Boot, MySQL (TiDB), Hibernate, API REST/SOAP, SFTP, Docker, Kubernetes
Responsibilities
Develop payment features and logistics functionalities; Design and implement robust REST/SOAP APIs; Integrate PSP APIs and new payment methods; Optimize performance and ensure 24/7 high availability; Manage production incidents; Write production-quality Java code.
Seniority
Senior, hands-on IC
