Senior Java Backend Engineer

Expleo is a global engineering, technology, and consulting service provider that partners with leading organizations to guide them through their business transformation, helping them achieve operational excellence and future-proof their businesses.

Expleo benefits from more than 50 years of experience developing complex products in automotive and aerospace, optimizing manufacturing processes, and ensuring the quality of information systems. Leveraging its deep sector knowledge and wide-ranging expertise in fields including AI engineering, digitalization, automation, cybersecurity and data science, the group’s mission is to fast-track innovation through each step of the value chain.

With a worldwide presence in 30 countries, our global footprint includes excellence centers around the world, including Romania since 1994.

We are looking for a Senior Java Backend Engineer to join international teams building and evolving digital payments platforms and transactional services. You will contribute to backend systems that support payment processing, merchant services, transaction flows, and other business-critical financial services environments where scalability, resilience, security, and performance are essential

You will join international engineering teams contributing to digital payments and transaction platforms in a business environment where security, scalability, resilience, performance, and service continuity are essential.

• Design, develop, and maintain backend services in Java.
• Build and enhance REST APIs and microservices used in transaction-oriented systems.
• Contribute to scalable and resilient architectures for high-volume applications.
• Work on integrations with internal platforms, external partners, and financial service ecosystems.
• Ensure code quality through testing, peer reviews, static analysis, and CI/CD practices.
• Improve production readiness, observability, and operational stability.
• Collaborate with cross-functional teams in an Agile / Scrum environment.
• Apply secure engineering practices in business-critical and regulated systems.

• More than 5 years of experience in backend software engineering.
• Strong hands-on experience with Java.
• Solid experience with Spring / Spring Boot, JEE, and REST services.
• Good knowledge of microservices architecture.
• Experience with JPA / Hibernate.
• Good understanding of Oracle or PostgreSQL.
• Experience with Git, CI/CD, and code quality tools such as SonarQube.
• Familiarity with Docker.
• Exposure to runtime environments such as JBoss, Tomcat, or similar.
• Good understanding of secure development principles.
• Previous experience in payments, banking, fintech, or other transaction-heavy regulated environments.
• Strong English communication skills.

• Exposure to Quarkus.
• Experience with GCP.
• Familiarity with OAuth2, OWASP, PKCS11, OpenSSL, or JSSE.
• Knowledge of payment ecosystems such as acquiring, issuing, merchant services, digital banking, or transaction processing platforms.

We are particularly interested in candidates who bring experience from payments, banking, fintech, merchant services, card-related systems, or other regulated transaction-heavy environments.

• Benefit Platform 
• Holiday Voucher 
• Private medical insurance  
• Performance bonus 
• Easter and Christmas bonus 
• Employee referral bonus 
• Bookster subscription  
• 7card
• Work from home options depending on project 
  

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