Senior Java Developer (Full-Stack / Backend) Hot Hybrid · Poland · Ukraine → at unicrew – New York | Jobyssey

Migrate backend services from legacy Spring/CXF/JSF to Spring Boot REST
Validate and test existing functionality in the new implementation
Fix defects introduced during migration
Implement remaining features in the new stack
Contribute to performance optimization efforts
Support Keycloak integration for identity and access management
(For fullstack candidates) Develop and maintain Angular frontend components, including work on the internal component library

Responsibilities

Migrate backend services from legacy Spring/CXF/JSF to Spring Boot REST
Validate and test existing functionality in the new implementation
Fix defects introduced during migration
Implement remaining features in the new stack
Contribute to performance optimization efforts
Support Keycloak integration for identity and access management
(For fullstack candidates) Develop and maintain Angular frontend components, including work on the internal component library

Requirements

5+ years of professional Java development experience
Strong Spring Boot, Spring, and Hibernate knowledge
Hands-on experience with Oracle and relational data modeling
Familiarity with legacy Java stacks (JSF, PrimeFaces, CXF) — enough to read, understand, and migrate existing code
Experience working with CI/CD pipelines (Jenkins, GitLab)
Docker usage in a development or deployment context
Upper-Intermediate English (written and spoken)
Ability to overlap with CET business hours

Nice to Have

Angular and TypeScript experience (fullstack profile preferred)
Keycloak or other IAM/SSO integration experience
German language skills — B2 level or higher
Redmine or similar issue tracker experience
Background in enterprise/domain-heavy applications (insurance, finance, claims, etc.)

Hiring Stages

What We Offer

Paid vacation and sick leaves in line with local standards
Flexible working hours
Possibility to work remotely
Regular team buildings and company-wide trips
Corporate lessons of English
Medical insurance
Support in preparation, as well as full reimbursement of professional certifications
Corporate psychotherapist services
Possibility to become a mentor in our corporate university
Highly transparent processes towards compensation reviews and promotions
Exposure to a rapidly growing, dynamic, and uniquely global industry
Becoming part of the team that has been multiple times recognized among Top Software Development Companies according to Clutch

Senior Java Developer (Full-Stack / Backend) Hot Hybrid · Poland · Ukraine →

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