Senior Java Developer with Apache Kafka (f/m/x)

🏢 Summary: Senior Java Developer role leading the delivery of resilient, highly available, event-driven microservices for a high-stakes financial environment. The position owns complex backend features end to end, from data models and APIs through deployment, monitoring, testing, and CI/CD quality practices. 🗂️ Requirements: 7+ years of commercial backend development, Proven experience building complex, distributed, scalable systems, Java 21+, Spring Boot, PostgreSQL, Kafka, OpenAPI, Vault, Kubernetes, Docker, Terraform, GitLab CI or Jenkins, Maven, Microservices architecture, Event-driven design, RESTful APIs, SCRUM, Strong collaboration skills, Fluent English 📃 Skills: Java, SpringBoot, PostgreSQL, Kafka, OpenAPI, Vault, Kubernetes, Docker, Terraform, GitLab, Jenkins, Maven, Microservices, REST, SCRUM 🏢 Description: Senior Java Developer We are looking for a Senior Java Developer (7+ years of experience) to lead the development of resilient, highly available systems and event-driven microservices in a high-stakes financial environment. Requirements: Experience: 7+ years of commercial backend development with a proven track record of building complex, distributed, and scalable systems. Tech Stack: Backend: Java 21+, Spring Boot, PostgreSQL, Kafka, OpenAPI, Vault DevOps & Cloud: Kubernetes , Docker, Terraform, GitLab CI/Jenkins, Maven Core Skills: Microservices architecture, event-driven design, RESTful APIs, SCRUM, strong collaboration skills, and fluent English. Nice to Have: Financial services/FinTech background, experience in distributed global teams, and exposure to AI/LLM integrations. Responsibilities: Architecture & Infrastructure: Lead the development of scalable, event-driven microservices engineered for high throughput and maximum uptime. Data & Security: Design robust data models while ensuring strict data consistency and security in a financial ecosystem. End-to-End Feature Ownership: Own complex backend features across their full lifecycle—from schema and API definition to deployment and production monitoring. Cross-Functional Collaboration: Partner with global stakeholders and frontend engineers to translate complex financial workflows into high-performance technical specs. Engineering Excellence: Elevate code quality through code reviews, modern CI/CD automation, and comprehensive testing (Unit, Integration, and Contract testing).

🏢 Summary: Senior Java Developer role focused on building and modernizing secure, scalable backend platforms and microservices for investment management products. The position offers hands-on architectural ownership, production support responsibilities, and collaboration across Agile engineering and business teams in a hybrid Krakow model. 🗂️ Requirements: 6+ years of commercial Java enterprise application development, Java 17+ proficiency, Advanced Spring and Spring Boot experience, REST API and backend service development experience, Microservices architecture knowledge, Object-oriented design, clean code, and design patterns, SQL query analysis and optimization, Docker and Kubernetes production experience, Kafka or event-streaming platform familiarity, CI/CD and DevOps practices experience, Secure coding and application security knowledge, Security scanning or vulnerability detection tools experience, Logging, monitoring, metrics, and distributed tracing familiarity, Business-critical production support and troubleshooting experience, Cross-functional collaboration with architects, QA, DevOps, and business teams, Very good English communication skills 📃 Skills: Java, Spring, SpringBoot, REST, SQL, Docker, Kubernetes, Kafka, CI/CD, DevOps, Microservices, Agile 🏢 Description: We are hiring on behalf of our client – a global financial services organization recognized for its premium service, deep domain expertise, and strong technology-driven approach. The company partners with clients, helping them solve complex challenges across investor services and capital markets. Their culture is built on collaboration, knowledge sharing, and empowering individuals to contribute beyond their immediate role. As a Senior Java Developer , you will design and develop core backend platforms and scalable microservices. You will contribute to new product development and modernization initiatives, influence architectural decisions, and work closely with engineering and business stakeholders throughout the software development lifecycle. This is a senior, hands-on engineering role with strong ownership expectations. You will help shape technical solutions, improve engineering practices, and ensure that business-critical systems remain secure, reliable, maintainable, and ready to scale. Key takeaways: Stack: Java 17+, Spring, Spring Boot, REST APIs, SQL, Docker, Kubernetes, Kafka, CI/CD Salary: 27 000 - 30 000 PLN gross on the Contract of Employment Working model : Hybrid - 3 days/week from the office (2 days per week for parents of children up to 4 years old) Location: ul. Klimeckiego, Krakow Recruitment process : A call with MOTIFE Recruiter (30 min) Technical interview with the Manager (1h) Technical interview with the Team (1h) Responsibilities: Backend Development Design, develop, and maintain enterprise-grade applications using Java 17+, Spring, and Spring Boot. Build scalable microservices and REST APIs supporting investment management products. Apply object-oriented design, clean code principles, and established software design patterns. Develop solutions that meet demanding performance, reliability, security, and maintainability standards. Architecture and Technical Excellence Contribute to architectural decisions and translate business requirements into effective technical solutions. Drive technical improvements across existing platforms and modernization initiatives. Participate in code reviews and promote consistent engineering standards across the team. Ensure solutions follow secure coding principles and software development lifecycle best practices. Cross-Functional Collaboration Partner with architects, QA engineers, DevOps specialists, and business stakeholders throughout the development lifecycle. Work within a cross-functional Agile team delivering web, backend, and mobile platform capabilities. Communicate technical decisions, risks, and dependencies clearly to technical and non-technical stakeholders. Support knowledge sharing and mentor other engineers where required. Delivery and Production Ownership Troubleshoot and resolve complex technical and production issues. Improve logging, monitoring, metrics, and distributed tracing across services. Enhance CI/CD pipelines to streamline software delivery and deployment. Drive continuous improvements in development processes, engineering tooling, and operational reliability. Requirements: Technical Expertise At least 6 years of hands-on commercial experience developing enterprise applications in Java. Strong practical knowledge of Java 17 or newer. Advanced experience with Spring, Spring Boot, REST APIs, and backend service development. Strong understanding of microservices architecture, object-oriented design, clean code, and software design patterns. Solid SQL skills, including practical experience with query analysis and optimization. Production experience with Docker and Kubernetes. Familiarity with messaging or event-streaming platforms such as Kafka. Experience working with CI/CD pipelines and modern DevOps practices. Security and Production Engineering Understanding of secure coding principles and common application security risks. Experience using security scanning or vulnerability detection tools. Familiarity with application logging, metrics, monitoring, and distributed tracing. Experience troubleshooting and supporting business-critical production systems. Collaboration and Mindset Proven ability to take ownership of technical solutions from design through production support. Strong problem-solving skills and the ability to resolve complex engineering challenges. Ability to collaborate effectively with architects, QA, DevOps, and business teams. Very good English communication skills. What we offer: Private medical care Life insurance Professional training and certification support Social fund benefits platform Stable employment with a long-term contract Apply now Join a senior engineering team building secure and scalable platforms for the investment management industry. Please apply via our careers page and submit your CV in English.

🏢 Summary: Long-term B2B Senior Java Developer contract for building secure, high-performance backend data-processing solutions in a microservices architecture. The role involves Java and Kafka development, CI/CD delivery, database integration, testing, monitoring, and security implementation in a hybrid work model. 🗂️ Requirements: 10+ years of Java development experience, Strong Kafka expertise, Experience with Confluent Kafka, Experience with KStreams, Experience with MongoDB Atlas, Experience with PostgreSQL 📃 Skills: Java, Kafka, Confluent, KStreams, MongoDB, PostgreSQL, Microservices, CICD 🏢 Description: Contract : B2B, long term Rate : 180-200 PLN/h Mode : Hybrid, 2-3 days per week at the office Location : Warsaw Summary: The Senior Java Developer is primarily responsible for designing and developing backend applications while ensuring adherence to high standards of security, performance, and quality. This role focuses on leveraging extensive experience in Java and Kafka to build robust data processing solutions within a microservices architecture. Main Responsibilities: Building, testing, and deploying software using CI/CD pipelines. Creating microservices for data processing, database interactions, and data exposure. Implementing relevant architectural patterns for data handling and web services. Ensuring accurate logging and alert configurations for operational efficiency. Conducting comprehensive testing of software for various performance criteria. Integrating security features, including authentication and authorization controls. Participating in a developer guild to share best practices and technical knowledge. Key Requirements: 10+ years of relevant experience in Java development. Strong expertise in Kafka, particularly with Confluent Kafka and KStreams. Experience with MongoDB Atlas and PostgreSQL as database technologies. Nice to Have: Familiarity with authentication protocols such as OIDC, OAuth2, and SAML. Experience with containerization technologies like Docker. Knowledge of Kubernetes for container orchestration. Experience with the ELK stack for logging, monitoring, and alerting.

🏢 Summary: Senior Java Developer role supporting secure, scalable banking and payments systems in Warsaw, with a hybrid schedule of one remote day per week. The position covers solution design, development, testing, and delivery of event-driven microservices within distributed systems. 🗂️ Requirements: 4+ years of Java development experience in financial or similarly complex domains, Java, Spring, Hibernate, DB2, Spring Boot, and RESTful API expertise, Apache Kafka experience, including producers, consumers, Kafka Streams, and Kafka Connect, MongoDB and Spring Data MongoDB knowledge, Docker, Maven, Git, and CI/CD pipeline familiarity, Understanding of event-driven microservices and distributed systems, Communicative English, Existing legal right to work in the European Union 📃 Skills: Java, Spring, Hibernate, DB2, Kafka, MongoDB, Docker, Maven, Git, GitLab, CI/CD, REST 🏢 Description: Unleash innovative financial solutions — shape the future of fintech with Java excellence! Warsaw-based opportunity with hybrid work model (1 remote day per week). As a Senior Java Developer , you will be working for our client, a leader in financial technology solutions. You will contribute to critical projects in the banking and payments industry, shaping the evolution of secure, scalable financial systems and ensuring seamless integration of cutting-edge technologies. This role offers an excellent platform for career growth amidst a dynamic, global team. Your main responsibilities: Participate in requirements gathering sessions with business users to understand project needs. Lead analysis, solution design, and planning activities within the engineering team. Implement and rigorously test software changes; participate in code reviews and assist in UAT and releases. Innovate by improving existing stacks and developing new functionalities in a fast-paced environment. Contribute to the development of event-driven and microservices architectures within distributed systems. Collaborate effectively with international teams and stakeholders. Maintain high-quality documentation and ensure adherence to best practices. Engage actively in continuous improvement initiatives and process optimizations. You're ideal for this role if you have: 4+ years of proven experience in Java development within financial or similarly complex domains. Proficiency in Java, Spring, Hibernate, DB2, Spring Boot, and RESTful API design. Experience with Apache Kafka, including producers, consumers, Kafka Streams, and Kafka Connect. Knowledge of MongoDB and Spring Data MongoDB. Familiarity with Docker, Maven, Git, and CI/CD pipelines (preferably GitLab CI). Solid understanding of event-driven/microservices architectures and distributed systems. Strong analytical, communication, and teamwork skills. Ability to work in a fast-paced, collaborative environment with a strong work ethic. It is a strong plus if you have: Experience with IBM MQ / JMS and infrastructure as code. Knowledge of financial messaging standards such as ISO 20022, SWIFT, CBPR+, FIN. Python scripting and experience in financial services, payments, or banking technology. Language Required for the role: Communicative English proficiency. 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: Hybrid Senior Java Backend Developer role in Krakow focused on building secure, scalable distributed microservices for modern banking messaging platforms. The role covers application design and development, quality standards, testing, automation, and technical mentoring within an Agile product team. 🗂️ Requirements: 5+ years of senior experience with Java, Spring Boot, and Kubernetes, Hands-on AWS cloud experience, CI/CD experience with GitHub, Jira, Jenkins, Maven, and Groovy, API design expertise: Swagger, OpenAPI 3.0, REST, JSON, microservices, OAuth 2.0 authentication and authorization experience, Kong API Gateway experience, TDD and Agile/Scrum development experience, Ability to translate business requirements into technical solutions, Communicative English proficiency, Legal right to work in Europe 📃 Skills: Java, Spring, Kubernetes, AWS, GitHub, Jira, Jenkins, Maven, Groovy, Swagger, OpenAPI, REST, JSON, Microservices, OAuth, Kong, TDD, Scrum 🏢 Description: Kick-start innovation in banking technology — develop scalable, secure, and high-performing microservices! Krakow-based opportunity with hybrid work model (up to 3 remote days per week). As a Senior Java Backend Developer – Cloud and Microservices Expertise, you will be working for a leading financial institution dedicated to delivering state-of-the-art messaging solutions to enhance customer engagement. Your expertise will drive the design and development of distributed systems, supporting the modernization and standardization of critical messaging platforms. Join the team and contribute to shaping the future of banking communication technology. Main responsibilities: - Apply technical expertise to develop high-quality applications and systems in line with requirements and standards. - Collaborate within a multi-disciplinary, Agile product team to design and build distributed microservices using modern technology stacks. - Define and maintain technical quality standards across platforms. - Build strong decision-making and problem-solving skills within your area of expertise. - Produce efficient, maintainable code that aligns with business needs and technical dependencies. - Conduct thorough unit testing to ensure software performance and reliability. - Challenge code and design quality to uphold industry standards and project excellence. - Contribute to automation test coverage and quality assurance processes. - Maintain effective communication with team members and stakeholders. - Promote innovative technologies and mentor engineering colleagues. You’re ideal for this role if you have: - Minimum of 5 years’ senior experience in Java, Spring Boot, and Kubernetes. - Practical experience working with Cloud platforms, especially AWS. - Strong knowledge of CI/CD tools such as GitHub, Jira, Jenkins, Maven, and Groovy. - Expertise in API design standards: Swagger, OpenAPI 3.0, REST, JSON, and Microservices architecture. - Knowledge of authentication and authorization via OAuth 2.0, with experience using Kong API Gateway. - Familiarity with Agile testing methodologies, particularly TDD, and extensive Agile/Scrum development experience. - Ability to work closely with business stakeholders to translate functional requirements into robust technical solutions. - Strong problem-solving capability with a focus on innovative, scalable solutions. It is a strong plus if you have: - Experience with additional cloud services or certifications. - Knowledge of DevOps practices beyond the core technologies listed. Language required for the role: - English – Communicative proficiency essential for effective collaboration and stakeholder engagement. Eligibility for the role: - Only candidates with an existing legal right to work in Europe will be considered for this role.

🏢 Summary: Long-term, fully remote B2B opportunity for a Senior Java Developer based in the EU. The role focuses on building and deploying high-quality, event-driven backend microservices using Java and Confluent Kafka, with responsibility for testing, security, observability, and scalable data processing. 🗂️ Requirements: 10+ years of relevant experience, Java backend development expertise, Confluent Kafka expertise, Kafka Streams expertise, MongoDB Atlas knowledge, PostgreSQL knowledge, Kafka certification 📃 Skills: Java, Kafka, Confluent, KStreams, MongoDB, PostgreSQL, CICD, Microservices, OIDC, OAuth2, SAML, Docker, Kubernetes, ELK 🏢 Description: Project Details - B2B - Long term - Full Remote (EU) Summary The Senior Java Developer role focuses on enhancing software development processes and developing and deploying high-quality backend applications using advanced technologies, particularly Kafka. Responsibilities - Build, test, and deploy software using standard CI/CD pipelines. - Develop microservices for data processing, database interaction, and application data exposure. - Apply architectural patterns suitable for event-based data streaming and web services. - Ensure logs are created, easy to understand, and integrated with the logging platform; set up necessary alerts. - Test software for functionality, quality, fault tolerance, performance, and scalability. - Integrate security features, including federated authentication and role-based access control. - Participate in a backend developer guild to exchange knowledge and best practices across teams. Key Requirements - 10+ years of relevant experience. - Expertise in Kafka, specifically Confluent Kafka (KStreams, etc.). - Strong knowledge of Java for backend applications. - Familiarity with MongoDB Atlas and PostgreSQL. - Kafka certification. Nice to Have - Experience with OIDC, OAuth2, and SAML for authentication. - Knowledge of Docker for containerization. - Familiarity with Kubernetes for container orchestration. - Experience with the ELK stack for logging, monitoring, and alerting.

🏢 Summary: Senior Java Engineer role building cloud-native backend services for life sciences organizations analysing potential adverse drug effects. The position combines hands-on Java development, technical ownership, distributed-system design, AWS operations, and collaboration with international cross-functional teams. 🗂️ Requirements: 4–7 years of Java backend development experience, Strong Spring and Spring Boot knowledge, Production AWS experience, Microservices architecture knowledge, SQL and relational database experience, Tomcat or similar application server familiarity, Independent technical decision-making and system design contribution, Good communication skills 📃 Skills: Java, Spring, SpringBoot, AWS, Microservices, SQL, Tomcat, Databases 🏢 Description: We are looking for a Senior Java Engineer to join our team building a cloud-native platform used by global Life Sciences organisations. You will work on backend services supporting pharmaceutical companies in analysing potential adverse drug effects. This role offers a mix of technical ownership, system design, and hands-on development in a highly collaborative, international environment. Your responsibilities: - Design, develop, and maintain backend services built with Java, Spring, Spring Boot, and AWS. - Contribute to architectural decisions and system-level discussions. - Ensure stability, scalability, and performance of distributed services. - Write clean, maintainable code and participate in code reviews. - Collaborate with cross-functional teams to translate requirements into technical solutions. - Support deployment automation and production operations. - Troubleshoot complex technical issues and propose improvements. Our requirements: - Minimum 4–7 years of experience in backend development with Java. - Strong knowledge of Spring and Spring Boot. - Experience with AWS in production environments. - Solid understanding of microservices architecture. - Hands-on experience with SQL and relational databases. - Familiarity with Tomcat or similar application servers. - Ability to work independently, make informed technical decisions, and contribute to system design. - Good communication skills. Nice to Have: - Familiarity with Kafka or other event-driven systems. - Ability to assist occasionally with small tasks in React. - Experience working on projects in healthcare or Life Sciences. What we offer: - Fully remote work with flexible arrangements tailored to your needs. - Benefits like a multisport pass and private healthcare to support your well-being. - Training budget and support for certifications. - Opportunities to work on international projects that expand your expertise. - Clear career growth paths with fast-track promotion opportunities.

🏢 Summary: Hybrid Senior Java Developer role focused on building scalable RESTful microservices and basic Angular front-end features for secure, high-performance web applications. The position uses Java 17, Spring, Angular, Oracle, and Jenkins within Agile and DevOps delivery workflows. 🗂️ Requirements: 6–8 years of Java development experience, Java 11+ / JDK 8+ experience, Angular 8+ experience, TypeScript and modern front-end development experience, Spring Framework experience: Boot, Batch, Security, 2–3 years of RESTful microservices experience, Hibernate and JUnit knowledge, SQL, PL/SQL, and Oracle database experience, Fluent English, Existing legal right to work in the European Union 📃 Skills: Java, JDK, Angular, TypeScript, JavaScript, HTML, CSS, Spring, SpringBoot, SpringBatch, SpringSecurity, REST, Microservices, JSON, XML, Hibernate, JUnit, SQL, PLSQL, Oracle, Jenkins, CI/CD, DevOps, Agile 🏢 Description: Work in a Warsaw/Kraków-based hybrid model, with up to 4 remote days per week. As a Senior Java Developer (basic Angular), you will support modern web applications and back-end services in a technology-focused environment. You will design, develop, and evolve microservices and front-end components that power reliable, secure, and high-performance solutions, using Java (currently Java 17), Angular, and RESTful architectures. - Develop and maintain back-end services using Java 11+ / Java 17 and Spring Framework, including Spring Boot, Batch, and Security. - Build and improve RESTful microservices and support microservices architecture from API design through implementation. - Implement front-end features with Angular 8+ (preferably Angular 14) using TypeScript, JavaScript, HTML, and CSS. - Work with JSON and XML data formats and contracts to ensure seamless system integration. - Create and maintain persistence layers using Hibernate and develop reliable unit tests with JUnit. - Develop and optimize database interactions using SQL and PL/SQL with Oracle databases. - Collaborate within Agile teams to deliver features efficiently and iteratively. - Apply DevOps principles in daily development workflows, including CI/CD pipelines with Jenkins. - 6–8 years of experience as a Java Developer. - Basic experience with Angular 8+; Angular 14 preferred, plus practical TypeScript and modern web front-end development. - Strong background in Java 11+; the project currently runs on Java 17, and JDK 8+. - Experience with Spring Framework, including Spring Boot, Batch, and Security. - Proven RESTful microservices experience of at least 2–3 years. - Working knowledge of Hibernate and JUnit. - Experience with SQL, PL/SQL, and Oracle databases. - Fluent English communication skills and a collaborative mindset with strong soft skills. - Existing legal right to work in the European Union. - Banking or financial industry experience and domain knowledge.

🏢 Summary: Long-term opportunity to develop and modernize a large-scale Big Data integration platform for the logistics sector. The role focuses on scalable Java backend services, Kafka-based event streaming, microservices, and enterprise integrations, with remote-work availability and benefits. 🗂️ Requirements: 10+ years of software development experience, Java 17+ and Spring Boot expertise, Strong Kafka and Confluent Kafka experience, Kafka Confluent Developer certification, Kafka Streams experience, Microservices and event-driven architecture experience, REST API, integration and messaging systems experience, Relational database experience, Kubernetes and basic DevOps knowledge, Fluent English 📃 Skills: Java, SpringBoot, Kafka, Confluent, KafkaStreams, REST, Microservices, PostgreSQL, MSSQL, Oracle, Kubernetes, DevOps, Git 🏢 Description: Compensation: 160–220 PLN/h net + VAT Join an international organization delivering a large-scale Big Data integration platform connecting systems across multiple countries within the logistics industry. This strategic migration and modernization initiative focuses on building scalable, event-driven solutions that support critical business operations. Quick Facts • Long-term cooperation on a strategic international program • Possibility of fully remote work • LuxMed and Multisport • Work with Java, Kafka, Kafka Streams, Kubernetes, and cloud-native architectures • Real impact on the development of a global integration platform Description As a Senior Java Developer, you will design and develop backend services and integrations for a complex enterprise ecosystem. You will modernize legacy applications, drive technical decisions, and build robust event-streaming solutions used across international markets. Responsibilities • Design, develop, and maintain scalable backend services and integrations • Build event-driven solutions connecting multiple enterprise systems • Work on large-scale Big Data and data-platform initiatives • Modernize legacy applications and migrate them to modern architectures • Define technical solutions and contribute to architectural decisions • Collaborate with product, business, and engineering teams • Mentor less experienced developers and promote best practices • Support production environments and ensure solution reliability Requirements • 10+ years of experience in software development • Strong expertise in Java 17+ and Spring Boot • Very strong Kafka knowledge • Confluent Kafka experience • Kafka Confluent Developer certification • Hands-on experience with Kafka Streams • Experience building microservices and event-driven architectures • Strong understanding of integrations, REST APIs, and messaging systems • Experience with relational databases: PostgreSQL, MS SQL, or Oracle • Kubernetes and basic DevOps knowledge • Fluent English Technology Stack • Java 17+ • Spring Boot • Kafka • Kafka Streams • REST API • Microservices • Kubernetes • PostgreSQL / MS SQL / Oracle • Git