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June 3, 2026

Senior Backend Developer

Senior • Hybrid

Warsaw, Poland

About the Project

Join an international team responsible for the development and modernization of a key corporate banking platform. The project focuses on transforming a legacy monolithic system into a modern architecture based on microservices while building new APIs that support the platform's future growth.

You will work in an Agile/SAFe environment, leveraging modern engineering practices and architectural patterns.

Responsibilities

  • Design and develop REST APIs

  • Build and maintain backend applications using Java and Spring Framework

  • Integrate systems and support system-to-system communication

  • Refactor legacy applications and extract business logic into microservices

  • Contribute to the modernization and migration of existing systems

  • Develop solutions across both monolithic and microservices architectures

  • Work with reactive programming technologies and frameworks

  • Support frontend integration with Angular-based applications

  • Create and maintain unit and BDD tests

  • Participate in code reviews and ensure high code quality standards

  • Collaborate with cross-functional teams and stakeholders

  • Produce and maintain technical and API documentation

Requirements

Must-Have Skills

  • Java

  • Spring Framework / Hibernate

  • SQL

  • REST API development

  • Microservices architecture

  • Cucumber

  • Jasmine

  • Strong English communication skills

Nice to Have

  • Angular

Technology Stack

  • Java

  • Spring Boot

  • Hibernate

  • SQL

  • REST APIs

  • Microservices

  • Angular

  • Cucumber

  • Jasmine

  • Git

  • Domain-Driven Design (DDD)

  • Hexagonal Architecture (Ports & Adapters)

  • WebFlux / Project Reactor

  • SAFe Agile