About this role
Full Time Senior Senior Principal Java Developer in healthcare at Madiff in Warsaw, Poland. Apply directly through the link below.
At a glance
- Work mode
- Office
- Employment
- Full Time
- Location
- Warsaw, Poland
- Experience
- Senior · 5+ years
Core stack
- Financial Reporting
- Design Patterns
- Microservices
- Architecture
- Performance
- Leadership
- Healthcare
- Mentoring
- Security
- CI/CD
- Agile
- SOLID
- Java
- REST
- SQL
Quick answers
What skills are required?
Financial Reporting, Design Patterns, Microservices, Architecture, Performance, Leadership, Healthcare, Mentoring, Security, CI/CD, and more.
Madiff is hiring for this role. Visit career page
Warsaw, Poland
We are looking for a Senior Principal Java Backend Developer to join a mission-critical backend platform operating at enterprise scale. The role is focused on hands-on backend development within a high-volume, production-critical fintech environment, with additional responsibility for mentoring engineers and supporting technical alignment across the team. The work involves building and maintaining core services supporting transaction processing, financial reporting, and merchant-facing functionality under strict security, availability, and performance requirements.
Responsibilities
- Design, develop, and maintain backend services using Java 17+
- Build scalable microservices supporting high transaction volumes and real-time processing
- Integrate backend services with Oracle databases, internal financial systems, and external APIs
- Ensure security, performance, and reliability aligned with fintech standards
- Collaborate closely with product managers, architects, and analysts
- Contribute to architectural decisions and platform modernisation
- Support production deployments, monitoring, and troubleshooting
- Mentor junior engineers and raise engineering standards
- Participate actively in code reviews and quality initiatives
Requirements
- Minimum 5 years of commercial Java backend experience
- Strong expertise with Java 17+
- Hands-on experience with Oracle, SQL, and PL/SQL
- Solid experience with microservices and REST APIs
- Strong understanding of clean architecture and design patterns
- Experience working in Agile delivery teams
- High ownership mindset and strong communication skills Nice to have
- Experience in fintech, payments, or banking environments
- Exposure to CI/CD, DevOps, and containerised environments
- Previous technical leadership or Team Lead experience
Benefits
- Solid, competitive salary
- Work in multinational environment on international projects
- Comprehensive healthcare
- Long-term B2B contract with stable project pipeline
- Hybrid work model