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Senior Java Developer

Sigma Software · Warsaw, Masovian Voivodeship, Poland

Software DevelopmentSenior LevelQuick applyfull-time6 days ago

About The Role

  • Design, develop, and maintain backend services for the payments platform using Java and Spring Boot
  • Ensure high availability, scalability, and performance of transaction processing systems
  • Collaborate with cross-functional teams to define technical requirements and deliver solutions end-to-end
  • Implement integrations with payment service providers and internal systems
  • Participate in architectural discussions and contribute to system evolution in a microservices environment
  • Monitor, troubleshoot, and optimize services in production
  • Ensure compliance with security, regulatory, and operational standards
  • Drive continuous improvement in code quality, testing, and deployment practices
  • 5+ years of commercial experience with Java and Spring Boot
  • Strong experience with MySQL and Kafka
  • Proven track record working with microservices architecture in high-traffic, high-load systems
  • Experience developing high-performance backend solutions for transaction-heavy platforms
  • Ownership mindset with ability to deliver services end-to-end
  • Excellent communication skills in English (C1 level), both written and verbal
  • Experience with Kotlin

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