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Senior Java Developer
Sigma Software · Warsaw, Masovian Voivodeship, Poland
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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