Senior Java Developer - (TMS - Terminal Management System)

🏢 Summary: 1-year project for a Senior Java Developer to design, implement, upgrade, and maintain a complex Terminal Management System handling 300k+ payment terminals. The role involves working with legacy code, distributed systems, system integrations, and ensuring application security through regular vulnerability scans. The system is based on Java and Spring ecosystem with intensive use of messaging and transactional mechanisms. 🗂️ Requirements: Very good knowledge of Java 8+, Strong understanding of object-oriented programming, Experience in designing and implementing application components, Practical knowledge of Spring and Spring Boot, Practical knowledge of SQL and relational databases, Experience with Hibernate and JPA, Knowledge of JEE frameworks, Experience with RabbitMQ or other message queues, Knowledge of Maven and Git, Experience with Gitlab and CI/CD pipelines, Experience with Jenkins and Nexus, Knowledge of Oracle database, Experience in RESTful API design, Experience in system integration, Experience with distributed systems, Experience with JBoss or WildFly, Knowledge of security scanning tools (Fortify, Sonatype) 📃 Skills: Java, Spring, SpringBoot, SQL, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, Gitlab, CICD, Jenkins, Nexus, Jira, Oracle, REST, JBoss, WildFly, Fortify, Sonatype, Hazelcast, GWT, GWTExt, SOAP, RMI 🏢 Description: Senior Java Developer (TMS) •         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 remotely); • 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 p ractical knowledge of Spring, Spring Boot, SQL, Scrum, 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 scanning tools (Fortify, Sonatype..) • Knowledge of English / B2; Nice to have: ·         Angular ·         Linux server ·         Docker 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. 1 year project with possibility for hiring after this time.

🏢 Summary: Role combining business analysis and senior Java development for a large-scale Terminal Management System, focused on designing, upgrading, integrating, and maintaining distributed enterprise applications. The project involves legacy system modernization, reverse engineering, automated testing, and work with complex integrations and distributed transactions. Hybrid work model in Warsaw with a 1-year contract and potential long-term hiring. 🗂️ Requirements: Work from Warsaw office 4 days per week, Java 8+, Object-oriented programming, Spring, Spring Boot, SQL, Scrum, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, GitLab, CI/CD, Jenkins, Nexus, Jira, Oracle, REST, System integration, Distributed systems, JBoss, WildFly, Fortify, Sonatype, English B2, Experience in design and implementation of application components, Experience with documentation and testing 📃 Skills: Java, Spring, SpringBoot, SQL, Scrum, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, GitLab, Jenkins, Nexus, Jira, Oracle, REST, JBoss, WildFly, Fortify, Sonatype, Hazelcast, SOAP, RMI, GWT, GWTExt, Angular, Linux, Docker 🏢 Description: Analyst (70%) Senior Java Developer (30%) – Terminal Management System Description • Design and implementation of IT solutions based on presented analytical and technical documentation; • Reviewing analytical documentation; • Creating technical documentation; • Technical upgrade for existing system; • Working with legacy code; • Reverse engineering based on: - existing source code - existing functional and technical documentation - collected and documented business processes - user interface to the system and accessing databases • Defining and building test cases for automatic tests. Job Requirements • Ability to work from the office in Warsaw (weekly: 4 days at office + 1 day remotely); • Very good knowledge of Java 8+ (17 - 21) 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, SQL, Scrum, 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 scanning tools (Fortify, Sonatype); • Knowledge of English / B2. Nice to have • Angular • Linux server • Docker Description of the area of involvement TMS (Terminal Management System) is used to manage a very large number of payment terminals (300k+), giving users a uniform way to manage different terminals from different hardware vendors. TMS has a complex architecture consisting of: • TMS (1 WildFly instance) providing GUI and implementing selected business functions; • RTMS (3 Spring Boot instances) implementing most business functionalities. A gradual migration from TMS to RTMS is being carried out. The system intensively uses Spring, Hibernate and RabbitMQ. The system includes distributed transactions (two-phase commit and 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. TMS is subjected to regular application scans and vulnerabilities removal. 1 year project with possibility for hiring after this time.

🏢 Summary: The role combines Senior Java Development (70%) with system analysis (30%) for a complex Terminal Management System managing 300k+ payment terminals. It involves designing, upgrading and integrating distributed system components, working with legacy code, and supporting migration to Spring Boot-based architecture. The project includes system integration, reverse engineering, automated testing and vulnerability remediation in a large-scale enterprise environment. 🗂️ Requirements: Very good knowledge of Java 8+ (17–21), Strong object-oriented programming knowledge, Experience in independent design, implementation, documentation and testing of application components, Very good practical knowledge of Spring and Spring Boot, Very good practical knowledge of Hibernate/JPA and JEE, Strong SQL knowledge, Knowledge of relational databases, especially Oracle, Experience with message queue systems (RabbitMQ), Practical knowledge of RESTful API design, Experience with distributed systems, Experience with system integration, Experience with application servers (JBoss/WildFly), Knowledge of Maven, Git, GitLab, GitLab CI/CD, Jenkins, Nexus, Jira, Knowledge of Scrum methodology, Knowledge of scanning tools (Fortify, Sonatype), Ability to work from Warsaw office 4 days per week 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, SQL, Oracle, RabbitMQ, REST, Maven, Git, GitLab, Jenkins, Nexus, Jira, JBoss, WildFly, Hazelcast, SOAP, RMI, GWT, GWTExt, Fortify, Sonatype, Scrum 🏢 Description: Analyst (70%) Senior Java Developer (30%) Terminal Management System •         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 • Reverse engineering based on: o existing source code o existing functional and technical documentation o collected and documented business processes, o user interface to the system and accessing databases • Defining and building test cases for automatic tests Job Requirements • Ability to work from the office in Warsaw (weekly: 4 days at office + 1 day remotely); • Very good knowledge of Java 8+ (17 - 21) and object-oriented programming issues; • Experience in independent design, implementation, documentation and testing of application components; • Very good and p ractical knowledge of Spring, Spring Boot, SQL, Scrum, 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 scanning tools (Fortify, Sonatype..) • Knowledge of English / B2; Nice to have : ·         Angular ·         Linux server ·         Docker 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. TMS is subjected to regular application scans and vulnerabilities removal 1 year project with possibility for hiring after this time.

🏢 Summary: B2B Senior Java Developer role focused on designing, implementing, and modernizing a large-scale Terminal Management System managing 300,000+ payment terminals within a distributed architecture. The position involves working with Spring-based microservices, WildFly applications, messaging systems, and complex integrations while supporting migration from a legacy system. The role includes system upgrades, legacy code refactoring, security remediation, and development in a hybrid work model in Warsaw. 🗂️ Requirements: Full availability in Polish time zone, Onsite work in Warsaw 4 days per week, Very good knowledge of Java 8+, Strong object-oriented programming skills, Experience in independent design and implementation of application components, Strong experience with Spring and Spring Boot, Strong experience with Hibernate/JPA and JEE, Practical experience with RabbitMQ or other message queues, Experience with Maven, Git, GitLab, Jenkins, Nexus, Knowledge of CI/CD pipelines, Good knowledge of Oracle or other relational databases, Experience in RESTful API design, Experience with distributed systems and system integration, Experience with JBoss or WildFly application servers, Knowledge of security scanning tools, English level B2 or higher 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, GitLab, Jenkins, Nexus, Jira, Oracle, SQL, REST, SOAP, RMI, WildFly, JBoss, Hazelcast, GWT, GWTExt, Fortify, Sonatype 🏢 Description: Senior Java Developer (TMS) Location: Warsaw, Poland Work model: Hybrid (4 days onsite / 1 day remote per week) Time zone: Polish time zone Contract type: B2B About the Project The Terminal Management System (TMS) is a large-scale platform used to manage over 300,000 payment terminals, providing a unified way to operate devices from multiple hardware vendors. The system has a complex, distributed architecture consisting of: TMS – a WildFly-based application providing GUI and selected business functionalities RTMS – three Spring Boot–based services implementing most of the business logic A gradual migration from TMS to RTMS is currently in progress. The platform makes extensive use of Spring, Hibernate, RabbitMQ, distributed transactions (2PC, Saga patterns), and distributed cache (Hazelcast). It is integrated with multiple internal and external systems via REST, SOAP, RMI, and direct database connections. The GUI layer is implemented using GWT and GWTExt. Responsibilities Design and implement IT solutions based on analytical and technical documentation Review analytical documentation and propose technical improvements Create and maintain technical documentation Perform technical upgrades of existing systems Work with and refactor legacy code Conduct regular application security scans and remove identified vulnerabilities Requirements Full availability in the Polish time zone Ability to work from the Warsaw office (4 days onsite + 1 day WFH weekly) Very good knowledge of Java 8+ and object-oriented programming Experience in independent design, implementation, documentation, and testing of application components Strong hands-on experience with Spring, Spring Boot, Hibernate/JPA, and JEE Practical experience with message queue systems, especially RabbitMQ Hands-on knowledge of development and CI/CD tools: Maven, Git, GitLab, GitLab CI/CD, Jenkins, Nexus, Jira Good knowledge of relational databases, particularly Oracle Practical experience in RESTful API design Experience with system integration and distributed systems Experience with application servers such as JBoss / WildFly Knowledge of security scanning tools (e.g. Fortify, Sonatype) English proficiency at B2 level or higher Benefits B2B contract Access to training and e‑learning platforms Sports card (e.g. Multisport) Private healthcare Opportunity to work on a large-scale, mission‑critical system Hybrid work model and a modern office in Warsaw

🏢 Summary: B2B contract for a Senior Java Developer to design, implement, and modernize a large-scale Terminal Management System handling 300k+ payment terminals. The role focuses on developing and migrating distributed systems components using Spring Boot and WildFly, integrating multiple internal and external services, and improving security through vulnerability scanning and upgrades. 🗂️ Requirements: Very good knowledge of Java 8+, Strong object-oriented programming skills, Experience in designing, implementing, documenting and testing application components, Very good practical knowledge of Spring and Spring Boot, Very good practical knowledge of Hibernate/JPA and JEE, Experience with message queue systems, especially RabbitMQ, Knowledge of Maven, Git, GitLab, GitLab CI/CD, Jenkins, Nexus, Jira, Knowledge of relational databases, particularly Oracle, Practical knowledge of RESTful API design, Experience in system integration, Experience with distributed systems, Experience with JBoss/WildFly application servers, Knowledge of security scanning tools (e.g., Fortify, Sonatype), Availability to work 4 days per week from Warsaw office, Full availability in Polish time zone 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, GitLab, Jenkins, Nexus, Jira, Oracle, REST, JBoss, WildFly, Fortify, Sonatype, Hazelcast, GWT, GWTExt, SOAP, RMI 🏢 Description: 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 p ractical 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

🏢 Summary: Senior Java Developer role focused on designing, implementing, and maintaining scalable and secure solutions within a complex payment terminal ecosystem. The position involves working with distributed systems, message queues, and legacy code while enhancing system performance and reliability. The role requires strong backend expertise and collaboration on integration and automated testing initiatives. 🗂️ Requirements: Minimum 4 years of Java development experience, Strong object-oriented programming skills, Proficiency in Java 8+, Experience with Spring and Spring Boot, Experience with Hibernate or JPA, Experience with JEE, Practical experience with RabbitMQ or other message queues, Experience with Maven, Git, Gitlab, Jenkins, Nexus, Jira, Strong knowledge of Oracle or other relational databases, Experience in RESTful API design and system integration, Experience with distributed systems, Experience with JBoss or WildFly, Experience with Hazelcast or cache technologies, Ability to create and maintain automated tests, Good command of English (B2 level), Legal right to work in the European Union 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, Gitlab, Jenkins, Nexus, Jira, Oracle, SQL, REST, JBoss, WildFly, Hazelcast 🏢 Description: Warsaw-based opportunity with hybrid work model (4 days from the office / week) As a Senior Java Developer , you will be working for our client, a leader in managing a complex payment terminal ecosystem that connects thousands of devices across multiple vendors. You will play a pivotal role in designing and implementing cutting-edge IT solutions to enhance the system’s performance, security, and scalability, driving the future of financial transactions. Your main responsibilities: Design and implement IT solutions based on analytical and technical documentation Review analytical documentation and create comprehensive technical documentation Conduct technical upgrades and work with legacy code to maintain system integrity Perform reverse engineering using existing source code and documented business processes Define and build test cases for automated testing frameworks Collaborate on system integration tasks involving distributed systems and message queues Support ongoing system improvements and security assessments, including vulnerability scans You're ideal for this role if you have: At least 4 years of experience in Java development, with strong object-oriented programming skills In-depth knowledge of Java 8+ and frameworks such as Spring, Spring Boot, Hibernate/JPA, and JEE Practical experience with message queue systems, especially RabbitMQ Familiarity with tools like Maven, Git, Gitlab, Jenkins, Nexus, and Jira supporting software development Solid understanding of relational databases, particularly Oracle Hands-on experience with RESTful API design and system integration Experience working with distributed systems, application servers (JBoss/WildFly), and cache technologies (Hazelcast) Knowledge of security scanning tools like Fortify or Sonatype is a plus Good command of English (B2 level) and excellent communication skills It is a strong plus if you have: Additional certifications in Java or cloud technologies Experience with microservices architecture and containerization (e.g., Docker, Kubernetes) Language Required for the role: Good command of English (Communicative level) Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. We offer you: ITDS Business Consultants is involved in various, innovative, and professional IT projects for international companies in the financial industry in Europe. We offer an environment for professional, ambitious, and driven people. The offer includes: Stable and long-term cooperation with very good conditions Enhance your skills and develop your expertise in the financial industry Work on the most strategic projects available in the market Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years Participation in Social Events, training, and work in an international environment Access to an attractive Medical Package Access to Multisport Program #GETREADY Internal job ID #9111 You can report violations in accordance with ITDS’s Whistleblower Procedure available here . #MAKEYourCareerBETTER

🏢 Summary: Senior Java Developer role focused on designing and modernizing distributed microservices systems for large-scale payment terminal management. The position involves building secure, scalable solutions using Java and related enterprise technologies, supporting system integration and legacy modernization. Hybrid work model in Warsaw with strong emphasis on system performance, security, and reliability. 🗂️ Requirements: 4+ years of Java development experience, Strong knowledge of Java 8+ and OOP, Experience with Spring and Spring Boot, Experience with Hibernate/JPA and JEE, Experience with RabbitMQ or message queues, Experience with RESTful APIs, Experience with relational databases (Oracle), Experience with distributed systems and system integration, Knowledge of JBoss or WildFly, Experience with Maven, Git, Gitlab, Jenkins, Nexus, Jira, Ability to create and review technical documentation, English level B2, Ability to work from Warsaw office 4 days per week, Legal right to work in the EU 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, RabbitMQ, REST, Oracle, Maven, Git, Gitlab, Jenkins, Nexus, Jira, JBoss, WildFly, CICD, DistributedSystems 🏢 Description: Unleash innovation in distributed systems — shape the future of microservices! Warsaw-based opportunity with hybrid work model. As a Senior Java Developer , you will be working for our client, an industry leader in terminal management systems, dedicated to creating robust solutions for managing millions of payment terminals worldwide. You will contribute to the design and implementation of cutting-edge IT solutions that enhance system performance, security, and scalability, driving digital transformation in the payments industry. Your main responsibilities: Design and implement IT solutions based on analytical and technical documentation Review and validate analytical documentation to ensure system integrity Create detailed technical documentation for development and maintenance Perform technical upgrades and work with legacy codebases Conduct regular vulnerability scans to ensure system security Collaborate on distributed systems development utilizing Spring, Hibernate, and RabbitMQ Support system integration with internal and external APIs and services Optimize and maintain application servers such as JBoss/WildFly Contribute to the migration and modernization of existing systems You're ideal for this role if you have: 4+ years of experience in Java development, with senior-level expertise Strong knowledge of Java 8+ and object-oriented programming principles Proven experience with Spring, Spring Boot, Hibernate/JPA, and JEE frameworks Practical knowledge of message queue systems, particularly RabbitMQ Familiarity with tools supporting development processes: Maven, Git, Gitlab, CI/CD pipelines, Jenkins, Nexus, Jira Working experience with relational databases, especially Oracle Practical knowledge of RESTful API design Experience with distributed systems and system integration Knowledge of application servers, including JBoss/WildFly Ability to review analytical documentation and create technical specifications Excellent command of Polish and English (B2 level) Ability to work from the Warsaw office 4 days per week + 1 day remote It is a strong plus if you have: Experience with scanning tools such as Fortify or Sonatype Eligibility to work on this role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Java Developer role focused on designing and modernizing distributed microservices systems for large-scale payment terminal management. The position involves building and optimizing secure, scalable solutions using Java and related enterprise technologies in a hybrid Warsaw-based model. 🗂️ Requirements: 4+ years of Java development experience, Strong knowledge of Java 8+ and OOP, Experience with Spring and Spring Boot, Experience with Hibernate/JPA and JEE, Practical experience with RabbitMQ, Experience with Maven and Git, Experience with CI/CD and Jenkins, Experience with relational databases (Oracle), Experience designing RESTful APIs, Experience with distributed systems, Knowledge of JBoss or WildFly, Ability to work from Warsaw office 4 days per week, Fluent Polish and English (B2), Legal right to work in the EU 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, Gitlab, CI/CD, Jenkins, Nexus, Jira, Oracle, REST, JBoss, WildFly 🏢 Description: Unleash innovation in distributed systems — shape the future of microservices! Warsaw-based opportunity with hybrid work model. As a Senior Java Developer , you will be working for our client, an industry leader in terminal management systems, dedicated to creating robust solutions for managing millions of payment terminals worldwide. You will contribute to the design and implementation of cutting-edge IT solutions that enhance system performance, security, and scalability, driving digital transformation in the payments industry. Your main responsibilities: Design and implement IT solutions based on analytical and technical documentation Review and validate analytical documentation to ensure system integrity Create detailed technical documentation for development and maintenance Perform technical upgrades and work with legacy codebases Conduct regular vulnerability scans to ensure system security Collaborate on distributed systems development utilizing Spring, Hibernate, and RabbitMQ Support system integration with internal and external APIs and services Optimize and maintain application servers such as JBoss/WildFly Contribute to the migration and modernization of existing systems You're ideal for this role if you have: 4+ years of experience in Java development, with senior-level expertise Strong knowledge of Java 8+ and object-oriented programming principles Proven experience with Spring, Spring Boot, Hibernate/JPA, and JEE frameworks Practical knowledge of message queue systems, particularly RabbitMQ Familiarity with tools supporting development processes: Maven, Git, Gitlab, CI/CD pipelines, Jenkins, Nexus, Jira Working experience with relational databases, especially Oracle Practical knowledge of RESTful API design Experience with distributed systems and system integration Knowledge of application servers, including JBoss/WildFly Ability to review analytical documentation and create technical specifications Excellent command of Polish and English (B2 level) Ability to work from the Warsaw office 4 days per week + 1 day remote It is a strong plus if you have: Experience with scanning tools such as Fortify or Sonatype Eligibility to work on this role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Java Developer role focused on designing and enhancing a large-scale payment terminal management system in a hybrid Warsaw-based setup. The position involves building, integrating, and upgrading distributed solutions to improve performance, security, and scalability. You will work with legacy systems, automated testing, and message-driven architectures in a complex financial environment. 🗂️ Requirements: Minimum 4 years of Java development experience, Strong object-oriented programming skills, Proficiency in Java 8+, Experience with Spring and Spring Boot, Experience with Hibernate/JPA and JEE, Hands-on experience with RabbitMQ or other message queues, Experience with Maven and Git, Familiarity with Gitlab, Jenkins, Nexus, Jira, Strong knowledge of Oracle or other relational databases, Experience designing and integrating REST APIs, Experience with distributed systems, Experience with JBoss or WildFly, Experience with Hazelcast or other caching technologies, Good command of English (B2 level) 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, Gitlab, Jenkins, Nexus, Jira, Oracle, REST, JBoss, WildFly, Hazelcast, Docker, Kubernetes, Fortify, Sonatype, Microservices 🏢 Description: Ignite innovation in enterprise systems — architect the future of payment terminal management! Warszawa-based opportunity with hybrid work model. As a Senior Java Developer – Backend and System Integration , you will be working for our client, a leader in terminal management systems, focused on managing extensive payment terminals across diverse hardware vendors. You will help design and implement scalable IT solutions that enhance system integration and optimize business processes, contributing to cutting-edge financial technology. Your main responsibilities: Design and implement IT solutions based on analytical and technical documentation. Review and create technical documentation for system components. Perform system upgrades and work with legacy code, including reverse engineering. Define and build test cases for automated testing frameworks. Collaborate on system integration projects using REST, SOAP, RMI, and database links. Contribute to migration efforts from TMS to RTMS components. Work with distributed systems, message queues (RabbitMQ), and application servers (WildFly/JBoss). Support vulnerability assessments and ensure system security compliance. You're ideal for this role if you have: At least 4 years of experience in Java development and system integration. Very good knowledge of Java 8+ and object-oriented programming. Practical experience with Spring, Spring Boot, Hibernate/JPA, and JEE frameworks. Hands-on experience with RabbitMQ and relational databases, especially Oracle. Proficiency in RESTful API design and distributed systems. Familiarity with application servers (WildFly/JBoss) and version control (Git, Maven, Jenkins, GitLab CI/CD). It is a strong plus if you have: Experience with scanning tools like Fortify or Sonatype. Knowledge of Hazelcast for distributed caching. Language Required for the role: Fluent Polish and English, at least B2 level. Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: The offer is for a Java Developer responsible for designing, implementing, and upgrading IT systems based on analytical and technical documentation in a hybrid work model. The role involves working with legacy code, performing reverse engineering, integrating distributed systems, and building automated tests. It requires strong experience with Java enterprise technologies and system integration in complex environments. 🗂️ Requirements: Very good knowledge of Java 8+, Strong object-oriented programming skills, Experience in independent design and implementation of application components, Experience in documenting and testing application components, Practical knowledge of Spring and Spring Boot, Practical knowledge of Hibernate and JPA, Knowledge of JEE, Experience with message queue systems, especially RabbitMQ, Experience with Maven, Git, GitLab, Jenkins, Nexus, Jira, Knowledge of relational databases, especially Oracle, Practical knowledge of RESTful API design, Experience in system integration, Experience with distributed systems, Experience with JBoss or WildFly, Knowledge of Fortify and Sonatype, English proficiency at B2 level 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, JEE, RabbitMQ, Maven, Git, GitLab, Jenkins, Nexus, Jira, Oracle, REST, JBoss, WildFly, Fortify, Sonatype 🏢 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 Nice to have: Experience with Linux environments Knowledge of code scanning tools (Fortify, Sonatype) Experience with AI-supported development tools (Codex) Offer Multisport card Private healthcare Access to an e-learning platform Group life insurance