Senior Java Developer

HAYS POLAND Sp. z o.o.

Data publikacji: 29.04.2026 Oferta wygasa: 29.07.2026

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Senior Java Developer

lokalizacja: mazowieckie

numer referencyjny: 1199419/praktykipl

The client is an American multinational company in the fintech industry

Key details:
Location: 4 days/week from the Warsaw office
Rate: 130–180 PLN/hour net + VAT
Job type: B2B contract
Duration: 12 months + extensions
Recruitment process: 2 stages
English and Polish: B2/B2+
Luxmed, MultiSport, equipment provided by the client

Job Responsibilities
- Design and implementation of IT solutions based on the presented analytical and technical documentation;
- Reviewing analytical documentation;
- Creating technical documentation;
- Technical upgrade for existing system;
- Working with legacy code
- Conducting regular scans in the application and removing vulnerabilities


Job Requirements
- Fully available in the Polish time zone;
- Ability to work from the office in Warsaw (weekly: 4 days at office + 1 day WFH );
- Very good knowledge of Java 8+ and object-oriented programming issues;
- Experience in independent design, implementation, documentation and testing of application components;
- Very good and practical knowledge of Spring, Spring Boot, Hibernate/JPA and JEE frameworks;
- Practical knowledge with message queue systems, particularly RabbitMQ;
- Practical knowledge of tools supporting the software development process: Maven, Git, Gitlab, Gitlab CI/CD, Jenkins, Nexus, Jira;
- Knowledge of relational databases, in particular Oracle;
- Practical knowledge of RESTful API design;
- Experience in system integration;
- Experience with distributed systems;
- Experience with application servers, JBoss/WildFly;
- Knowledge of scannnfg tools (Fortify, Sonatype..)
- Description of the area of involvement

TMS (Terminal Management System) is used to manage a very large number of payment terminals (300k+), it gives users a uniform way to manage different terminals from different hardware vendors. TMS has a complex architecture, consisting of two components TMS (1 WildFly instance) providing GUI and implementing some business functions and RTMS (3 Spring-boot instances) implementing most of the business functionalities. A gradual migration from TMS to RTMS is being carried out. The system intensively uses Spring, Hibernate and RabbitMQ. The system has distributed transactions (different two-phase-commit, saga approaches) and distributed cache (Hazelcast). TMS is integrated with many internal and external systems (via REST, SOAP, RMI, direct database connections and database links). The GUI is written in GWT and GWTExt.

Hays Poland sp. z o.o. is an employment agency registered in a registry kept by Marshal of the Mazowieckie Voivodeship under the number 361

hays.pl

Hays Poland sp. z o.o. jest agencją zatrudnienia nr 361

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