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

unicrew; Town of Poland (NY); Hybrid; USD 110,000 - 160,000; Full time

Benefits offered by this job

Paid vacation and sick leaves

Flexible working hours

Remote work option

Medical insurance

Certifications reimbursement

Team events

English lessons

Job summary

unicrew is hiring a senior Java developer to migrate legacy backend services to Spring Boot REST, validate functionality, fix defects, and implement remaining features in the new stack.

The role emphasizes strong Java/Spring/Hibernate skills, Oracle relational modeling, CI/CD experience, and Docker usage, with English proficiency and CET hours overlap. Remote work options are available.

Qualifications

• 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 to read, understand, and migrate code.
• Experience working with CI/CD pipelines (Jenkins, GitLab).
• Docker usage in development or deployment contexts.
• Upper-Intermediate English (written and spoken).
• Ability to overlap with CET business hours.

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 and internal library.

Skills

Java development

Spring Boot

Spring

Hibernate

Oracle

Relational data modeling

JSF/PrimeFaces/CXF legacy stacks

CI/CD (Jenkins, GitLab)

Docker usage

English (Upper-Intermediate)

CET hours overlap

Tools

Jenkins

GitLab

Job description

• 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

• General Interview
• Hiring Manager Interview
• Internal Tech Interview (Tech Session & Live Coding)
• Job Offer Presenting & Reference Check

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