Java Engineer & Test Automation

🏢 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: Lead the development of Java-based banking applications and production-grade LLM and agentic AI solutions. The role combines technical leadership, hands-on delivery with Java/Spring Boot and React, cloud-native engineering, and AI architecture in a hybrid Kraków-based project. 🗂️ Requirements: Tech Lead, Lead Engineer, or Senior Software Engineer experience, Hands-on Java, Spring Boot, and React expertise, Kafka, PostgreSQL, and Redis experience, Kubernetes, Terraform, and CI/CD knowledge, AWS, Azure, or GCP experience, Production delivery of LLM-powered applications, Prompt engineering and prompt evaluation experience, Structured outputs, function/tool calling, and agent orchestration experience 📃 Skills: Java, Spring, React, Kafka, PostgreSQL, Redis, Kubernetes, Terraform, CICD, AWS, Azure, GCP, LLM, LangSmith, PromptFlow, Braintrust 🏢 Description: Engineering Tech Lead (Java | AI/LLM) 📍 Kraków, Poland | Hybrid (6 days/month in the office) 🏦 International Banking Project 🤝 Employment via Antal (B2B or Employment Contract / UoP) We are looking for an Engineering Tech Lead to drive the development of modern Java-based applications while leading the adoption of LLM, Prompt Engineering, and Agentic AI solutions. This role is ideal for someone with hands-on experience building and operating production-grade AI systems—not someone who has only used generative AI tools. Your responsibilities Lead technical design and architecture decisions while mentoring the engineering team. Design, develop, and deliver high-quality applications using Java/Spring Boot and React . Build and optimize CI/CD pipelines , Kubernetes-based deployments, and cloud infrastructure. Design, test, and optimize prompts for production LLM use cases. Build and maintain Agentic AI solutions, including tool/function calling, multi-agent workflows, evaluation pipelines, observability, and guardrails. Partner with product and business teams to translate business requirements into scalable technical solutions. What we're looking for Proven experience as a Tech Lead, Lead Engineer, or Senior Software Engineer . Strong hands-on expertise in Java, Spring Boot, and React . Experience with Kafka, PostgreSQL, and Redis . Solid knowledge of Kubernetes, Terraform, and CI/CD practices. Experience working with AWS, Azure, or GCP . Hands-on experience delivering LLM-powered applications into production , including Prompt Engineering, prompt evaluation (e.g. LangSmith, PromptFlow, Braintrust), structured outputs, function/tool calling, and agent orchestration. Nice to have Experience designing autonomous or multi-agent AI systems. Knowledge of LLM observability, evaluation frameworks, and responsible AI practices. Experience working in highly regulated environments such as banking or financial services. What we offer Long-term project for a global banking client. Opportunity to build production-grade AI solutions using the latest LLM technologies. International engineering environment with real influence on technical direction and architecture. Hybrid work model – 6 days per month from our Kraków office . Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams. Discover our latest job openings: https://en.antal.pl/candidates Follow us on LinkedIn: https://www.linkedin.com/company/antalpoland