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IT Part time Remote · DACH region · Liechtenstein · Hybrid Reporting to: CTO

Senior Java Backend Developer

Our team is expanding, and we are looking for a highly experienced Senior Java Backend Developer to join our team and help us with the designing, developing and maintaining high- performance backend services, APIs, and database systems that power mission-critical applications.

We’re a FinTech company reinventing high-risk-market payments with an integrated digital identity layer. Our team is expanding, and we are looking for a highly experienced Senior Java Backend Developer to join our team and help us with the designing, developing and maintaining high-performance backend services, APIs, and database systems that power mission-critical applications. This role requires deep expertise in Java, modern backend architecture, scalable APIs, and relational databases.

Key Responsibilities:

  • Design, develop, and maintain robust, scalable backend services using Java
  • Build and enhance RESTful APIs consumed by internal and external applications
  • Lead database design, optimization, and query performance tuning (PostgreSQL, MySQL, or similar)
  • Write clean, testable, and maintainable code; participate in code reviews
  • Troubleshoot, debug, and resolve production issues with a strong focus on reliability and performance
  • Contribute to CI/CD processes and help improve software development workflows
  • Collaborate with cross-functional teams including Frontend, DevOps, and Product to deliver high-quality features
  • Mentor junior developers and contribute to architectural decisions and best practices

Key Requirements:

  • 5+ years of professional experience in backend development using Java
  • Strong understanding of core Java and JVM internals
  • Hands-on experience with RESTful API design and development
  • Proven experience with relational databases (e.g., PostgreSQL, MySQL) and SQL performance tuning
  • Solid understanding of software engineering principles and best practices
  • Excellent problem-solving skills and ability to work independently and in a remote setting
  • Strong communication skills in English

What would differentiate you:

  • Experience with Spring Boot or similar frameworks
  • Knowledge of message queues (Kafka, RabbitMQ)
  • Familiarity with cloud-native architectures and containerization (e.g., Docker, Kubernetes)
  • Familiarity with microservices architecture
  • Experience with automated testing and test frameworks

What we offer:

  • Competitive base salary
  • 100% remote working model & flexible hours
  • Hardware of your choice, and a culture of async documentation
  • Possibility to participate in a critical part of our business and make a real impact

If the above sounds a lot like you, please send your CV to job@tantumpay.com.

Only shortlisted candidates will be contacted.