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Software Engineer II - Java

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Mastercard

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Location:
Poland , Warsaw

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Contract Type:
Not provided

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Salary:

Not provided

Job Description:

The Java Engineer is a hands on executor responsible for building, testing, and operating backend services under the guidance of Senior Engineers. This role focuses on implementing Spring Boot services, CRUD workflows, and API driven features that support Commerce Media’s platform capabilities. Java Engineers at Mastercard operate with an AI first development mindset, using AI coding and reasoning tools as part of their day to day workflow to accelerate delivery, improve code quality, and deepen technical understanding—while learning when to rely on human judgment and established architectural guidance.

Job Responsibility:

  • Implement backend services using Java and Spring Boot following established designs, patterns, and architectural direction
  • Build and extend CRUD functionality backed by relational or NoSQL data stores
  • Develop and consume RESTful APIs as part of API driven workflows
  • Apply AI coding tools (e.g., GitHub Copilot, ChatGPT, Claude, similar assistants) to: Accelerate feature implementation and refactoring, Generate and improve unit and integration tests, Assist with debugging, error analysis, and code comprehension, Improve documentation and inline code clarity
  • Write unit and integration tests to validate correctness and prevent regressions
  • Partner with Senior Engineers to break down work, validate approaches, and execute features effectively
  • Participate in code reviews, incorporating feedback from both peers and AI assisted suggestions under senior guidance
  • Assist with debugging, defect resolution, and production support as needed
  • Follow established standards for security, observability, maintainability, and responsible AI usage

Requirements:

  • 3–5 years of professional experience building backend applications in Java
  • Working knowledge of Spring Boot and RESTful service development
  • Experience implementing CRUD based applications with database persistence
  • Familiarity with API driven system design and service to service communication
  • Demonstrated use of AI coding assistants for development, testing, and learning
  • Basic understanding of database modeling and query usage
  • Exposure to containerized development environments (Docker)
  • Interest in learning observability, performance tuning, and production ownership

Additional Information:

Job Posted:
April 16, 2026

Employment Type:
Fulltime
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