Senior Java Developer/Analyst

Experis ManpowerGroup Sp. z o.o.; Town of Poland (NY); On-site; USD 47,435 - 79,059; Full time

Job summary

Experis ManpowerGroup Sp. z o.o. is seeking an experienced Java developer for on-site work in Warsaw.

The role focuses on design, implementation, and modernization of a monolithic system toward microservices, with 50% analytical duties and 50% development. Strong Java, Spring Boot, Hibernate/JPA, and REST knowledge are required. Candidates should have 5+ years of experience, familiarity with legacy systems, and willingness to work in a Polish time zone.

Qualifications

• Very good knowledge of Java (8+) and OO programming; Java 17 is a plus.
• At least 5+ years of experience; Regular/Senior level.
• Experience in independent design, implementation, documentation and testing.
• Strong knowledge of Spring/Spring Boot, Hibernate/JPA, JEE, RESTful APIs, Oracle.
• Practical experience with messaging queues, distributed systems, and JBoss/WildFly.
• Experience with Maven, GitLab CI/CD, Jenkins, Nexus, Jira, and Docker.

Responsibilities

• Design and implementation of IT solutions based on analytics and technical docs.
• Review and improve analytical documentation; maintain technical docs.
• Lead migrations toward microservices and modernize legacy Java 8 systems.
• Work with legacy code and a monolithic TMS system; participate in refactoring.
• Define and implement automated test cases; perform regression testing.
• collaborating with security improvements and vulnerability mitigation.
• Work in Scrum; ~50% analytical work and ~50% development; support rollout to new markets.

Skills

Java (8+)

Analytical thinking

Agile/Scrum

Tools

Maven

Git

GitLab

GitLab CI/CD

Jenkins

Nexus

Jira

Docker

JEE

Hibernate/JPA

Spring Boot

RabbitMQ

Job description

• On-site work from Warsaw (5 days per week from the Client's office)
• Full availability in the Polish time zone
• Polish language is required
• English: at least B2

Tasks

• Design and implementation of IT solutions based on analytical and technical documentation
• Review and improvement of analytical documentation
• Creation and maintenance of technical documentation
• Technical upgrades and modernization of an existing system (including migration to Java 17 and newer technologies like Spring Boot)
• Work with legacy code and monolithic architecture (Java 8-based system)
• Reverse engineering based on: existing source code, functional and technical documentation, documented business processes, system UI and database access
• Participation in transformation of a monolithic TMS system (POS terminal management) towards microservices architecture
• Defining, designing and implementing automated test cases (including regression testing)
• Identification of areas for test automation based on code and documentation
• Work with system security improvements and vulnerability mitigation
• Close cooperation with operational and development teams (~50% analytical work / ~50% development)
• Working in Scrum (2-week sprints) in a small development team
• Supporting system evolution and rollout to new markets (e.g. Germany)

Requirements

• Very good knowledge of Java (8+) and object-oriented programming (experience with Java 17 is a plus)
• At least 5+ years of experience (Regular/Senior level)
• Experience in independent design, implementation, documentation and testing of application components
• Strong analytical skills and ability to work with legacy systems
• Very good practical knowledge of: Spring / Spring Boot, Hibernate / JPA, JEE, RESTful API design, Relational databases (especially Oracle)
• Practical experience with: message queues (RabbitMQ), system integration and distributed systems, application servers (JBoss / WildFly), development tools: Maven, Git, GitLab, GitLab CI/CD, Jenkins, Nexus, Jira
• Docker