Senior Java Developer

🏢 Summary: Senior Java Developer role on a strategic international Big Data integration platform in logistics. The position focuses on modernizing legacy systems and building scalable, event-driven backend services with Java, Spring Boot, and Kafka in a hybrid work model. 🗂️ Requirements: 10+ years of software development experience, Java 17+ expertise, Spring Boot expertise, Strong Kafka knowledge, Kafka Streams experience, Microservices experience, Event-driven architecture experience, Integration, REST API, and messaging systems knowledge, Relational database experience, Kubernetes and basic DevOps knowledge, Fluent English 📃 Skills: Java, Spring, Kafka, Microservices, Kubernetes, PostgreSQL, MSSQL, Oracle, Git 🏢 Description: Senior Java Developer (Kafka) 💰 150-200 PLN/h net + VAT 📝 B2B/UoP 📍 Warsaw | Hybrid model: 1 day per week from the office Join an international organization delivering a large-scale Big Data integration platform connecting systems across multiple countries within the logistics industry. This is a strategic migration and modernization initiative focused on building scalable, event-driven solutions that support critical business operations. Your role As a Senior Java Developer, you will be responsible for designing and developing backend services and integrations for a complex enterprise ecosystem. You will help modernize legacy applications, drive technical decisions, and build robust event-streaming solutions used across international markets. Must-have skills 10+ years of experience in software development Strong expertise in Java 17+ and Spring Boot Very strong Kafka knowledge (must-have) 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, Oracle) Kubernetes and basic DevOps knowledge Fluent English Nice to have: Confluent Kafka experience Confluent Kafka Developer certification What you'll do 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 What we offer Long-term cooperation on a strategic international program Competitive rate up to 200 PLN/h B2B or employment contract Hybrid work model (1 office day per week) LuxMed and Multisport Opportunity to work with modern technologies including Java, Kafka, Kafka Streams, Kubernetes, and cloud-native architectures Real impact on the development of a global integration platform Technology stack: Java 17+, Spring Boot, Kafka, Kafka Streams, REST API, Microservices, Kubernetes, PostgreSQL/MS SQL/Oracle, Git. Co zyskasz dzięki aplikacji na ofertę Antal? Gdy Twoja aplikacja zostanie rozpatrzona pozytywnie (zostaniesz zaproszony/a do procesu), otrzymasz wsparcie Konsultanta/Konsultantki, który/a utrzyma z Tobą stały kontakt (mailowo lub telefonicznie), pomoże Ci przygotować się do rozmowy rekrutacyjnej z przyszłym pracodawcą oraz zatroszczy się o jakość procesu rekrutacyjnego, w którym aktualnie bierzesz udział. Kim jesteśmy? Jesteśmy liderem rekrutacji specjalistów i menedżerów oraz doradztwa w obszarze HR. Marka obecna jest w 35 krajach, w Polsce działa od 1996 roku. Przez ten czas zbudowaliśmy wiele karier kandydatów, dzięki elastycznemu i kompleksowemu podejściu do wszystkich rekrutacji. Antal tworzy ponad 130 profesjonalnych konsultantów ds. rekrutacji, którzy są oni nie tylko skutecznymi rekruterami, ale także wykwalifikowanymi doradcami, specjalizującymi się zarówno w zakresie wybranego sektora, jak i stanowiska. Sprawdź inne aktualne oferty pracy na: https://antal.pl/dla-kandydata Zaobserwuj nasz profil na LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 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: Senior Java Developer (Kafka160) 💰 160-220 PLN/h net + VAT 📝 B2B/UoP 📍 Warsaw | Hybrid / Remotely Join an international organization delivering a large-scale Big Data integration platform connecting systems across multiple countries within the logistics industry. This is a strategic migration and modernization initiative focused on building scalable, event-driven solutions that support critical business operations. Your role As a Senior Java Developer, you will be responsible for designing and developing backend services and integrations for a complex enterprise ecosystem. You will help modernize legacy applications, drive technical decisions, and build robust event-streaming solutions used across international markets. Must-have skills 10+ years of experience in software development Strong expertise in Java 17+ and Spring Boot Very strong Kafka knowledge (must-have) Confluent Kafka experience Kafka Confluent Developer certification (must-have) 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, Oracle) Kubernetes and basic DevOps knowledge Fluent English What you'll do 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 What we offer Long-term cooperation on a strategic international program Possibility of fully remote work LuxMed and Multisport Opportunity to work with modern technologies including Java, Kafka, Kafka Streams, Kubernetes, and cloud-native architectures Real impact on the development of a global integration platform Technology stack: Java 17+, Spring Boot, Kafka, Kafka Streams, REST API, Microservices, Kubernetes, PostgreSQL/MS SQL/Oracle, Git. Co zyskasz dzięki aplikacji na ofertę Antal? Gdy Twoja aplikacja zostanie rozpatrzona pozytywnie (zostaniesz zaproszony/a do procesu), otrzymasz wsparcie Konsultanta/Konsultantki, który/a utrzyma z Tobą stały kontakt (mailowo lub telefonicznie), pomoże Ci przygotować się do rozmowy rekrutacyjnej z przyszłym pracodawcą oraz zatroszczy się o jakość procesu rekrutacyjnego, w którym aktualnie bierzesz udział. Kim jesteśmy? Jesteśmy liderem rekrutacji specjalistów i menedżerów oraz doradztwa w obszarze HR. Marka obecna jest w 35 krajach, w Polsce działa od 1996 roku. Przez ten czas zbudowaliśmy wiele karier kandydatów, dzięki elastycznemu i kompleksowemu podejściu do wszystkich rekrutacji. Antal tworzy ponad 130 profesjonalnych konsultantów ds. rekrutacji, którzy są oni nie tylko skutecznymi rekruterami, ale także wykwalifikowanymi doradcami, specjalizującymi się zarówno w zakresie wybranego sektora, jak i stanowiska

🏢 Summary: Senior Java Developer contract for a logistics project, focused on building secure, high-performance backend data-processing services in a microservices architecture. The role uses Java, Confluent Kafka/KStreams, MongoDB Atlas and PostgreSQL, with hybrid work from the Warsaw office 2–3 days per week. 🗂️ Requirements: 10+ years of Java development experience, Strong Confluent Kafka expertise, Strong KStreams expertise, MongoDB Atlas experience, PostgreSQL experience, English proficiency, Polish proficiency 📃 Skills: Java, Kafka, Confluent, KStreams, MongoDB, PostgreSQL, CI/CD, Microservices 🏢 Description: 🌍Work model: 2-3 days a week from the Warsaw office. 💰Rate: B2B - up to 190 zl/h. ⏰Start: ASAP/ 1 month. ⏳Project length: > 12 months + extensions. 📕Project language: English + Polish. 💼 Industry: Logistics. ⚙️Recruitment process: 2 interviews with the client. 🔍Workload: fulltime. 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.