Senior Java Developer - Backend Engineering Team

🏢 Summary: Senior Tech Lead Java consulting role focused on designing and leading scalable backend development for gaming and digital platform services in a hybrid Lisbon setup with occasional travel to the UK. The position combines hands-on Java engineering, architecture ownership, team leadership, and collaboration across distributed international teams. 🗂️ Requirements: 8+ years of Backend Java development experience, Strong expertise in Java, Strong expertise in Spring, Strong expertise in Spring Boot, Strong expertise in Hibernate, Strong expertise in JPA, Experience with REST APIs, Experience with Oracle databases, Experience with MySQL databases, Experience designing scalable backend systems, Experience with CI/CD tools, Experience with Git, Previous technical leadership or senior developer experience, Knowledge of software architecture and design patterns, Fluent English, Ability to work in hybrid model in Lisbon, Availability for periodic travel to the UK 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, SQL, Oracle, MySQL, Git, Jenkins, Azure, AWS, Scala, Docker, Kubernetes, Scrum 🏢 Description: Model: Hybrid - 2 times a week at Lisbon’s office | Availability for monthly travel to Watford Duration: 12+ months Languages: English (mandatory) Engagement: Full-time consulting Seniority: Tech Lead / Senior Java Engineer Industry: Gaming / Lottery / Digital Platforms About the Role We are seeking an experienced Tech Lead – Java to join our engineering team. This role requires a strong technical leader capable of driving architectural decisions, mentoring developers, ensuring code quality, and contributing hands-on to backend development using modern Java frameworks. The Tech Lead will collaborate with Product Owners, Architects, Senior Developers, and QA teams to design, build, and maintain highly scalable and reliable backend services. Main Responsibilities Technical Leadership - Lead and mentor a team of Java developers across multiple workstreams. - Provide technical guidance, code review, and best-practice enforcement (coding standards, testing, architecture). - Coordinate with solution architects to ensure alignment on system design. - Drive technical decision-making and ensure platform scalability and maintainability. Software Design & Development - Lead the design of backend components in Java, Spring, Spring Boot, Hibernate/JPA. - Develop new modules, APIs, and integrations in a large-scale distributed environment. - Ensure the implementation of robust and efficient solutions aligned with business needs. - Maintain and improve existing features, ensuring optimal performance. Architecture & Integration - Translate functional requirements into technical specifications. - Oversee integration with Oracle and MySQL databases. - Design RESTful services following best security and performance practices. - Ensure compatibility with frontend, middleware, and third-party services. Quality & Delivery - Ensure high quality through automated tests, CI/CD, and code reviews. - Collaborate with QA to guarantee full traceability of requirements → features → test cases. - Use Azure DevOps for backlog management, pipelines, and documentation. Cross-Team Collaboration - Act as the bridge between engineering, product, QA, and business teams. - Contribute to sprint planning, backlog refinement, and architectural discussions. - Coordinate with internal engineering teams distributed globally. Key Requirements Core Technical Skills - 8+ years of professional experience in Backend Java Development. - Strong expertise in Java (8+). - Strong expertise in Spring & Spring Boot. - Strong expertise in Hibernate / JPA. - Experience with REST APIs. - Experience with SQL databases (Oracle, MySQL). - Solid experience designing scalable backend systems. - Familiarity with CI/CD tools and version control (Git, Jenkins, etc.). - Experience with cloud environments (Azure or AWS) is a plus. Technical Leadership - Previous experience leading small teams or acting as senior reference developer. - Strong knowledge of software architecture, patterns, and best practices. - Ability to guide developers through complex debugging and architectural challenges. Soft Skills - Strong communication skills and ability to work with cross-functional teams. - Ownership mindset with a proactive approach. - Fluent in English (mandatory). - Ability to collaborate in an international environment. Nice to Have - Knowledge of Scala or other JVM languages. - Experience with containerization (Docker, Kubernetes). - Familiarity with gaming or high-transaction environments. - Exposure to Agile methodologies (Scrum). Other Details This is a hybrid role based in Lisbon with a requirement for remote collaboration and availability for periodic travel to the UK.

🏢 Summary: Senior Java Developer role focused on designing, building, and maintaining scalable, secure, high-performance backend systems using modern Java and cloud-native technologies. The position involves working in Agile teams, leading technical discussions, mentoring developers, and driving DevOps automation. Hybrid work model with regular presence in the Warsaw office. 🗂️ Requirements: 8+ years of backend development experience, Proficiency in Java 17+, Experience with Spring Boot and Spring Security, Strong knowledge of Hibernate and JPA, Experience with Maven, Strong SQL skills with PostgreSQL, Experience in cloud-native application development, Hands-on experience with Git and GitHub pipelines, Experience with CI/CD tools, Experience with Kubernetes and Helm, Ability to write Bash/Shell scripts, Experience with JUnit, AssertJ, and Hamcrest, Degree in Computer Science or equivalent experience 📃 Skills: Java, Spring, SpringSecurity, Hibernate, JPA, Maven, PostgreSQL, SQL, Kubernetes, Helm, Docker, Bash, Git, GitHub, CICD, JUnit, AssertJ, Hamcrest 🏢 Description: Role Overview As a Senior Java Developer, you will design, build, and maintain scalable, secure, and high-performance backend systems. Working closely with cross-functional teams, you’ll drive innovation – including the use of GenAI tools like GitHub Copilot -and mentor other developers. Work mode: hybrid 2-3 days / 5 days at the Warsaw office. Key Responsibilities Backend & DB: Develop robust, multi-tenant applications using Java 17+, Spring Boot, and PostgreSQL. DevOps & Automation: Manage deployments using Docker, Kubernetes, and Helm; automate tasks via Bash/Shell scripting. Leadership & Agile: Lead design discussions, mentor peers, and actively participate in Scrum events within a distributed team. Requirements Technical Skills: Java Stack: Java 17+, Spring (Boot, Security), Hibernate/JPA, Maven. Data & Cloud: SQL (PostgreSQL), cloud-native application development. DevOps & CI/CD: Git/GitHub (pipelines), CI/CD tools, Kubernetes, Helm, Bash. Testing: JUnit, AssertJ, Hamcrest. Skills & Experience: 8+ years of professional backend experience (preferably in enterprise environments). Degree in Computer Science (or equivalent experience). Fluent English ( B2/C1 ) and strong collaboration skills in Agile teams. Nice-to-Have Kafka & Event-driven / Microservices architecture. Python, C, or Go (Golang) scripting. Monitoring tools (Kibana, Grafana, Prometheus). Security best practices (OWASP Top 10) & Jira. Client A global leader with a sharp focus on lottery solutions. A confident step forward building on a long history of delivering safe and secure technology, demonstrating strong commitment to customers as a dedicated lottery service provider. Leveraging collective insight, experience, and expertise to create reliable and engaging solutions that help lottery clients achieve objectives, meet player needs, and deliver meaningful benefits to communities.

🏢 Summary: Full-time Senior Java Developer role focused on designing and maintaining high-performance, secure backend systems in a cloud-native environment. The position involves leading technical design, developing scalable applications with Java 17+ and Spring Boot, and supporting CI/CD and Kubernetes-based deployments. Work is remote or hybrid (Warsaw) within Agile, distributed teams. 🗂️ Requirements: Mastery of Java 17+, Proficiency in Spring, Spring Boot, Spring Security, Experience in cloud-native application development, Experience with Maven, Experience with SQL databases, Proficiency in Git and GitHub including pipeline development, Knowledge of JUnit, AssertJ, Hamcrest, Experience with CI/CD tools and processes, Experience with Kubernetes and Helm, Bash/Shell scripting skills, Experience in enterprise environments, Experience working in Agile (Scrum/Kanban) teams 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, Maven, SQL, Git, GitHub, JUnit, AssertJ, Hamcrest, CICD, Kubernetes, Helm, Bash, Shell, Docker 🏢 Description: Type of work : Full-time; Remote/Hybrid (Warsaw) As a Senior Java Developer, you will lead the design, development, and maintenance of high-performance backend systems. You’ll collaborate with product managers, architects, and developers to ensure our solutions are scalable, secure, and future-ready. We encourage the use of Generative AI tools like GitHub Copilot to boost innovation and productivity. Requirements Java, Postgresql, Liquibase, Spring boot, Angular. Responsibilities Develop robust, configurable applications using Java 17+ and Spring Boot to effectively meet the diverse requirements of multiple customers. Ensure the efficiency of PostgreSQL databases for scalable solutions. Ensure security, scalability, and performance in all backend solutions. Employ Bash/Shell scripting for automation and comprehensive system integration tasks. Contribute to application deployment using Docker and Kubernetes , while utilizing Helm for package management. Communicate effectively in English (B2/C1 level) within distributed teams. Participate actively in scrum events. Collaborate with other engineering teams. Lead design discussions and mentor other developers. Client A global leader with a sharp focus on lottery solutions. A confident step forward building on a long history of delivering safe and secure technology, demonstrating strong commitment to customers as a dedicated lottery service provider. Leveraging collective insight, experience, and expertise to create reliable and engaging solutions that help lottery clients achieve objectives, meet player needs, and deliver meaningful benefits to communities.

🏢 Summary: Mid-level Java Developer role in a multinational fintech project, contributing to the creation of a center of excellence in a hybrid work model in Lisbon. The position focuses on backend development using Java and Spring within microservices-based architectures, with CI/CD and database integration. Candidates should have solid experience in Java backend technologies and work effectively in an Agile environment. 🗂️ Requirements: Higher education degree, Minimum 3 years of Java backend development experience, Strong knowledge of Java 8 or higher, Experience with Spring and Spring Boot, Experience with RDBMS (Oracle or PostgreSQL), Experience with SQL, Experience with JPA and Hibernate, Knowledge of microservices-based architecture, Experience with CI/CD pipelines, English proficiency at B2+ level 📃 Skills: Java, Spring, SpringBoot, SQL, Oracle, PostgreSQL, JPA, Hibernate, Microservices, CI/CD, Angular, AWS, Scrum, Agile 🏢 Description: We are looking for a Java Developer Mid for an opportunity to join and be part of the creation of a center of excellence for a leading multinational fintech company . The project’s work model has been updated to 2 days per week in the office in Lisbon and 3 days working from home . Required qualifications: The candidate must have at least one higher education degree. Experience with Java Backend development with strong theoretical knowledge ( Java >= 8 ) ( 3+ years for Mid profiles ). Experience with Spring/Spring Boot. Experience in RDBMS (Oracle, PostgreSQL, SQL). Experience in JPA and Hibernate. Knowledge in Application architecture (MicroServices based architecture, hexagonal…). Experience with CI/CD. English proficiency should be at least B2+ level. Ideally, the candidate should also have: Experience with Java Frontend (Angular or any other UI framework). Experience with AWS or other cloud platform. Problem-solving skills and logical reasoning. Passion for learning and growing as a developer. Experience working in an Agile environment and Scrum methodologies. Other details: The position is hybrid, requiring 2 days per week in the office in Lisbon and 3 days working from home , facilitating a balanced workflow.

🏢 Summary: Mid-level Java Backend Developer role focused on building and contributing to a microservices-based architecture within a fintech center of excellence. The position involves developing and maintaining backend services using Java and Spring technologies in a hybrid work model. 🗂️ Requirements: Higher education degree, 3+ years of Java backend development experience (Java 8 or higher), Experience with Spring and Spring Boot, Experience with RDBMS (Oracle, PostgreSQL, SQL), Experience with JPA and Hibernate, Knowledge of microservices-based and hexagonal architecture, Experience with CI/CD pipelines, English proficiency B2+ or higher 📃 Skills: Java, Spring, SpringBoot, Oracle, PostgreSQL, SQL, JPA, Hibernate, Microservices, Hexagonal, CICD, Angular, AWS, Scrum 🏢 Description: We are looking for a Java Developer Mid for an opportunity to join and be part of the creation of a center of excellence for a leading multinational fintech company . The project’s work model has been updated to 2 days per week in the office in Lisbon and 3 days working from home . Required qualifications: The candidate must have at least one higher education degree. Experience with Java Backend development with strong theoretical knowledge ( Java >= 8 ) ( 3+ years for Mid profiles ). Experience with Spring/Spring Boot. Experience in RDBMS (Oracle, PostgreSQL, SQL). Experience in JPA and Hibernate. Knowledge in Application architecture (MicroServices based architecture, hexagonal…). Experience with CI/CD. English proficiency should be at least B2+ level. Ideally, the candidate should also have: Experience with Java Frontend (Angular or any other UI framework). Experience with AWS or other cloud platform. Problem-solving skills and logical reasoning. Passion for learning and growing as a developer. Experience working in an Agile environment and Scrum methodologies. Other details: The position is hybrid, requiring 2 days per week in the office in Lisbon and 3 days working from home , facilitating a balanced workflow.

🏢 Summary: Senior Java Developer role focused on building scalable REST APIs and advanced backend systems using modern Java and Spring technologies. The position involves designing, developing, and testing secure enterprise solutions in a hybrid work model. It offers the opportunity to contribute to large-scale digital transformation initiatives. 🗂️ Requirements: 5+ years of professional experience in Java development, Strong expertise in Java 17+, Strong expertise in Spring Boot 3/4+, Experience with Git, Kubernetes, Jenkins, Flyway, RabbitMQ, and PostgreSQL, Experience in building and securing REST APIs, Ability to perform unit and integration testing, Ability to analyze requirements and translate them into technical solutions, Fluent English (written and spoken), Legal right to work in the European Union, Availability to work in a hybrid model (up to 2 remote days per week) 📃 Skills: Java, Spring, SpringBoot, Git, Kubernetes, Jenkins, Flyway, RabbitMQ, PostgreSQL, REST, UnitTesting, IntegrationTesting, Architecture, Security, English 🏢 Description: Unleash innovation with scalable enterprise solutions — shape the future of digital transformation! Warsaw-based opportunity with hybrid work model (up to 2 remote days per week). As a Senior Java Developer , you will be working for our client, a leading player in the technology industry committed to delivering cutting-edge software solutions. You will contribute to building robust, scalable REST APIs and advanced backend systems, empowering organizations to transform their digital landscapes and drive business success. This is your chance to grow your career at the forefront of technological innovation. Your main responsibilities: Analyze requirements and convert them into comprehensive technical tasks, supporting the development process. Propose and challenge technical solutions to ensure optimal implementation. Develop functionalities in Java 17+ using Spring Boot 3/4+ in line with architectural and security standards. Conduct thorough unit and integration testing to ensure code quality. Create and update technical and architectural documentation for ongoing project clarity. Share knowledge with team members to foster continuous learning and improvement. Stay updated on technological advancements and suggest innovative enhancements. You're ideal for this role if you have: 5+ years of professional experience in Java development or relevant fields. Strong expertise in Java 17+ and Spring Boot (version 3 or 4+). Experience with Git, Kubernetes, Jenkins, Flyway, RabbitMQ, and PostgreSQL. Proven ability to analyze complex requirements and translate them into technical solutions. Solid understanding of REST API development, architecture, security, and best practices. Excellent communication skills in fluent English. Ability to work in a hybrid model, with up to 2 remote days per week. It is a strong plus if you have: Knowledge of containerization and orchestration tools or certifications. Experience working within Agile teams or with CI/CD pipelines. Language Required for the role: Fluent English, written and spoken. Eligibility to work in Europe: 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 building and maintaining Java backend applications within a newly established center of excellence in a multinational environment. The position combines hands-on backend development with mentoring responsibilities, active participation in architecture discussions, and CI/CD practices. It offers a collaborative, non-hierarchical setup with a hybrid work model. 🗂️ Requirements: Higher education degree, 5+ years of experience in Java Backend development, Strong proficiency in Spring and Spring Boot, Experience with relational databases (Oracle, PostgreSQL, SQL), Experience with JPA and Hibernate, Knowledge of microservices-based and hexagonal architecture, Experience with CI/CD tools and practices, English proficiency at B2 level 📃 Skills: Java, Spring, SpringBoot, Oracle, PostgreSQL, SQL, JPA, Hibernate, Microservices, HexagonalArchitecture, CICD, Angular, AWS, Scrum, Agile 🏢 Description: Summary: The role of a Senior Java Developer involves contributing to the establishment of a center of excellence within a leading multinational company. The primary goal is to leverage strong Java development skills in a collaborative, innovative environment while mentoring junior developers. Responsibilities: * Join the establishment of a center of excellence. * Develop and maintain Java backend applications. * Mentor and coach junior team members (Senior role). * Facilitate onboarding and serve as a role model (Lead role). * Collaborate in a horizontal organization with no management hierarchy. * Engage in CI/CD practices and application architecture discussions. Must Haves: * Higher education degree. * Strong experience with Java Backend development (5+ years). * Proficiency in Spring/Spring Boot framework. * Experience with Relational Database Management Systems (Oracle, PostgreSQL, SQL). * Familiarity with JPA and Hibernate. * Knowledge of Application architecture (Microservices based, hexagonal…). * Proficiency in CI/CD tools. * English proficiency at B2 level. Nice to Haves: * Experience with Java Frontend frameworks (Angular or similar). * Familiarity with AWS or other cloud platforms. * Problem-solving skills and logical reasoning. * Passion for continuous learning and growth. * Experience in Agile environments and Scrum methodologies. Other Details: * Work Model: 4 days in-office initially, transitioning to 3 days in-office and 2 days remote. * Work Schedule: 43 hours/week in winter and 39 hours/week in summer with additional compensation days.

🏢 Summary: Senior Java Developer role focused on building and maintaining Java backend applications within a center of excellence, contributing to architecture decisions and CI/CD processes. The position involves working in a collaborative, non-hierarchical environment and mentoring junior developers. It requires strong backend expertise and active participation in modern microservices-based architectures. 🗂️ Requirements: Higher education degree, 5+ years of Java backend development experience, Strong knowledge of Spring and Spring Boot, Experience with relational databases (Oracle, PostgreSQL), Proficiency in SQL, Experience with JPA and Hibernate, Knowledge of microservices-based architecture, Experience with CI/CD tools and processes, English proficiency at B2 level 📃 Skills: Java, Spring, SpringBoot, SQL, Oracle, PostgreSQL, JPA, Hibernate, Microservices, CI/CD, Angular, AWS 🏢 Description: Summary: The role of a Senior Java Developer involves contributing to the establishment of a center of excellence within a leading multinational company. The primary goal is to leverage strong Java development skills in a collaborative, innovative environment while mentoring junior developers. Responsibilities: * Join the establishment of a center of excellence. * Develop and maintain Java backend applications. * Mentor and coach junior team members (Senior role). * Facilitate onboarding and serve as a role model (Lead role). * Collaborate in a horizontal organization with no management hierarchy. * Engage in CI/CD practices and application architecture discussions. Must Haves: * Higher education degree. * Strong experience with Java Backend development (5+ years). * Proficiency in Spring/Spring Boot framework. * Experience with Relational Database Management Systems (Oracle, PostgreSQL, SQL). * Familiarity with JPA and Hibernate. * Knowledge of Application architecture (Microservices based, hexagonal…). * Proficiency in CI/CD tools. * English proficiency at B2 level. Nice to Haves: * Experience with Java Frontend frameworks (Angular or similar). * Familiarity with AWS or other cloud platforms. * Problem-solving skills and logical reasoning. * Passion for continuous learning and growth. * Experience in Agile environments and Scrum methodologies. Other Details: * Work Model: 4 days in-office initially, transitioning to 3 days in-office and 2 days remote. * Work Schedule: 43 hours/week in winter and 39 hours/week in summer with additional compensation days.

🏢 Summary: Senior Backend Java Developer role focused on designing and building scalable, high-performance backend systems using Java and Spring Boot in a cloud-native environment. The position involves developing enterprise-grade solutions, ensuring performance and security, and supporting containerized deployments. The role requires strong experience with modern backend technologies and infrastructure tools. 🗂️ Requirements: 8+ years of backend development experience, Strong experience with Java 17+, Strong experience with Spring and Spring Boot, Experience with Spring Security, Experience with SQL databases, Experience with Maven, Experience with Git and CI/CD pipelines, Experience with testing frameworks (JUnit, AssertJ, Hamcrest), Experience with Kubernetes and Helm, Experience with Bash or Shell scripting, Experience with cloud-native applications, Experience in enterprise environments 📃 Skills: Java, Spring, SpringBoot, SpringSecurity, SQL, Maven, Git, CICD, JUnit, AssertJ, Hamcrest, Kubernetes, Helm, Bash, Shell, Docker, PostgreSQL 🏢 Description: Senior Backend Java Developer Location: Warsaw, Poland (hybrid – 2 days/week in the office) About the Role We’re looking for a Senior Backend Java Developer to design and build scalable, high-performance backend systems for international products. You’ll work in a collaborative environment, contribute to architectural decisions, and mentor other engineers. Responsibilities Design, develop, and maintain backend systems using Java 17+ and Spring Boot Ensure scalability, performance, and security of solutions Work with SQL databases (e.g. PostgreSQL) Support deployments using Docker, Kubernetes, and Helm Use Bash/Shell for automation and integration tasks Lead technical discussions and mentor team members Collaborate in Agile (Scrum) teams and communicate in English Requirements Strong experience with Java 17+, Spring / Spring Boot / Spring Security Experience with cloud-native applications Maven, SQL, Git (GitHub, CI/CD) Testing frameworks (JUnit, AssertJ, Hamcrest) Kubernetes, Helm Bash/Shell scripting English B2/C1 Experience in enterprise environments 8+ years of backend development experience Nice to Have PostgreSQL, Hibernate/JPA Kafka, event-driven architecture Microservices architecture Python Knowledge of C or Go CI/CD tools, JIRA Monitoring tools (Grafana, Prometheus, Kibana) Security best practices (OWASP) Qualifications Degree in Computer Science or related field

🏢 Summary: The offer is for a Java Developer responsible for designing and building scalable backend systems and microservices for international clients. The role involves developing Java-based applications, ensuring high code quality, and contributing to technical improvements within a hybrid work model. 🗂️ Requirements: Minimum 5 years of experience with Java, Hands-on experience with Spring Framework, Experience with Hibernate, Understanding of microservice architecture 📃 Skills: Java, Spring, Hibernate, Microservices 🏢 Description: Join Sii and play a key role in delivering solutions for international clients. As a Java Developer, you will design and build scalable backend systems, develop microservices, and ensure high-quality code. You will collaborate with cross-functional teams and support strategic technology initiatives across the organization. We are looking for candidates who are open to working in a hybrid model (2 days at the office). Your tasks Design, develop, and maintain Java-based backend applications Build and evolve microservice architectures Collaborate with product owners, architects, and QA teams Ensure code quality through reviews, testing, and best practices Actively contribute to technical improvements and innovations Requirements At least 5 years of experience with Java Hands-on knowledge of Spring Framework Experience with Hibernate Understanding of microservice architecture Proactive mindset, good communication, and teamwork skills A very good level of English is required Nice-to-have requirements Experience with cloud platforms What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!