Java Developer

Andersen Software, Inc.; Warszawa; Hybrid; PLN 180,000 - 240,000; Full time

Job summary

A leading software development company is looking for a Java Developer to join a large FinTech initiative focused on building secure credit card management systems. The ideal candidate must have over 4 years of experience in Java development, particularly with Java 17 or 21, and a solid background in Fintech. This role offers remote, hybrid, or on-site work options along with opportunities for professional growth and bonuses based on expertise.

Benefits

Private health insurance

Compensation for sports activities

Access to corporate training

Referral program

Qualifications

• 4+ years of experience as a Java Developer, especially with Java 17 or 21.
• 2+ years in Fintech, Banking, or Credit card processing.
• Hands-on with Spring Cloud Gateway, Spring Data JPA, and Spring Security.
• Experience tuning database performance and schema optimization.

Responsibilities

• Design and develop Java-based applications in a FinTech context.
• Build scalable microservices and manage RESTful APIs.
• Participate in CI/CD pipeline development and maintenance.

Skills

Java Developer experience

Spring Boot

RESTful APIs

CI/CD tools

Level of English – Upper-Intermediate

Tools

PostgreSQL

MongoDB

Docker

Kubernetes

Apache Kafka

Job description

Andersen is hiring a Java Developer for a large FinTech initiative, building a secure and scalable credit card management platform integrated into a major bank’s digital ecosystem.

Our customer is a major global company providing technology solutions for financial institutions and enterprises. It delivers secure, scalable systems and supports digital transformation across multiple regions. The organization focuses on innovation and efficient service delivery, offering a stable environment and a strong engineering culture.

The project is the development of a new credit card management system for a major bank, seamlessly integrated into the existing digital ecosystem. It is a large-scale initiative focused on building a secure, high-performance, and scalable platform to ensure efficient credit card lifecycle management and support the expansion of lending services.

Responsibilities

• Designing, developing, and optimizing Java-based applications using Java 17 or 21, leveraging modern language features and performance best practices.
• Building scalable and maintainable microservices using Spring Boot 3.x and relevant Spring Framework modules.
• Developing and exposing RESTful APIs with Spring Web and implementing gRPC integrations for efficient inter-service communication.
• Implementing API gateway patterns, routing, filters, and authentication/authorization hand-off using Spring Cloud Gateway.
• Working with Spring Data JPA (Hibernate), JDBC, QueryDSL, and jOOQ for robust and efficient data access and manipulation.
• Participating in CI/CD pipeline development and maintenance using GitLab/GitHub, Docker, Kubernetes, Helm, SonarQube, and automated static/dynamic application security testing (SAST/DAST).

Requirements

• Experience as a Java Developer (17 or 21) for 4+ years.
• Experience in Fintech, Banking, or Credit card processing for 2+ years, including understanding of bank core systems and transaction flows.
• Hands-on experience with Spring Boot 3.x and Spring Framework modules: Spring Cloud Gateway, Spring Data JPA (Hibernate), JDBC, QueryDSL/jOOQ, Spring Security (OIDC/JWT, RBAC).
• Experience with relational databases (PostgreSQL/Oracle) and NoSQL (MongoDB, Redis).
• Experience with Apache Kafka.
• Experience with testing and QA tooling: JUnit 5, Testcontainers, Pact (contract tests), WireMock/MockServer, as well as load testing (k6/Gatling).
• Experience with query performance tuning and database schema optimization.
• Solid understanding of REST and gRPC communication patterns.
• Level of English – from Upper-Intermediate and above.

Desired skills

• Understanding of ISO-8583 fundamentals (authorization, reversal, advice flows) or similar transaction-processing APIs.
• Knowledge of PCI-DSS practices: tokenization, PAN masking, HSM integration, audit trails.
• Experience with Resilience4j (timeouts, retries, circuit breakers, bulkheads).
• Experience with Prometheus, Grafana, ELK/OpenSearch.
• Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc..
• The opportunity to change the project and/or develop expertise in an interesting business domain.
• Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant.
• Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee.
• The opportunity to earn up to an additional 1,000 USD per month, depending on the level of expertise, which will be included in the annual bonus, by participating in the company's activities.
• Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated.
• Referral program.
• Private health insurance and compensation for sports activities.

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