Contract: B2BLocation: Remote within PolandProject: Development and maintenance of backend services and internal systems for banking products and processes for the leading bankStart: ASAPKey TechnologiesBackend: Java (Core Java)Spring (Spring Boot, Spring MVC, Spring Data, Spring Security), HibernateAPIs: REST API design & integrationDatabases: MS SQL, OracleGood knowledge of message queues: Kafka, Pub/SubTools: Maven, Git, JUnit, MockitoProject OverviewJoin our Rite NRG team as a Java Tech Lead and work on a long-term project for a bank.You’ll lead a backend team responsible for building integrations with an external instant payments platform for the Western European market, delivering a card-issuing solution that enables co-badge cards (combining an international card scheme with a local scheme), and integrating local mobile wallet / account-to-account payment services into the bank’s digital channels.Your work will directly impact how customers in this market pay, transfer money in real time, and use their cards in both domestic and international ecosystems. You’ll be the key technical decision-maker for cards & payments in this area, working closely with the bank’s architecture, product, and operations teams.ResponsibilitiesOwn the technical vision and architecture for card issuing and payments integrations in the project.Lead a team of Java Developers (code reviews, mentoring, pair programming, tech guidance).Design, develop, and maintain backend services in Java/Spring for card issuing, authorization flows, limits, fees, tokenization support, and transaction processing.Design and integrate RESTful APIs with external payment providers, local schemes, and internal banking systems.Build and evolve microservices-based solutions, ensuring high availability, resilience, and observability.Work with relational databases (MS SQL, Oracle): design schemas for cards & payments domain, optimize queries and performance.Utilize message queues (such as Kafka or Pub/Sub) to establish reliable, event-driven integrations with external payment and wallet services.Collaborate closely with solution architects, security, and operations on non-functional requirements (performance, security, observability, compliance).Ensure code quality and testing standards (unit, integration, contract tests) and drive best practices within the team.Support production rollouts, incident analysis, and continuous improvement of the platform.Communicate with business and technical stakeholders, helping translate business needs into sustainable technical designsRequirements8+ years of experience in Java development (Java-based web/backend applications).Strong, hands-on experience with the Spring ecosystem (Spring Boot, Spring MVC, Spring Data; Spring Security a strong plus).Solid commercial experience with Hibernate.Very good understanding of REST APIs, web services, and microservices architecture.Strong knowledge of SQL and relational databases (MS SQL Server, Oracle, or similar).Good knowledge of message queues (Kafka, Pub/Sub or similar).Practical knowledge of Maven in commercial projects.Hands-on experience with Git and modern branching/review workflows.Experience with card schemes and payment schemes.Ability to own technical decisions and explain trade-offs to both engineers and business stakeholders.Experience in mentoring and raising the technical bar in a team.Fluency in Polish and good command of English (for documentation and communication). Nice to haveExperience with instant payments or high-throughput, low-latency systems in finance.Exposure to BPM/workflow engines (e.g., Flowable, Camunda, Activiti).Experience working in distributed, multinational teams. Why join us?Rite NRG is a vibrant outsourcing technology company driven by the Right People. We are dedicated to empowering businesses through innovative software solutions. We focus on building strong partnerships and providing top-notch software solutions that drive real business growth. Our business model revolves around collaboration and delivering impactful results for our clients.Join us, and be part of a team where great minds, Right Energy, and strong partnerships come together to shape the future of technology!Stable, long-term, full-time collaboration.Remote work within Poland and flexible working hours.High engineering culture with a focus on growth and learning.Multinational teams.Benefits: Private medical care, Multisport card, and workation (work for a week from Barcelona or elsewhere).