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Mastercard Logo Mastercard · IT - Software Development

Lead Software Engineer - Java

Poland, Warsaw · Job Posted April 16, 2026
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Job Description

Mastercard Developers is the single gateway for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. We are looking for versatile and customer obsessed engineers to join our team. You will play a key role in designing and developing next generation digital products and services in Mastercard for a global audience.

Job Responsibility

  • Design and develop technical solutions for global customers (internal and external)
  • Continually ideate, scope, develop, deliver, test and iterate features for the constantly evolving and growing API Platform
  • Contribute to Mastercard Open Source projects that offer API Client signing and encryption libraries
  • Ensure appropriate levels of automation are adopted (build, deploy, configure, validate, monitor)
  • Liaise with other global technology, data, operations teams to execute
  • Act as subject matter expert for API Platform and services to support customer integrations on occasion

Requirements

  • Strong Java or Kotlin skills, including extensive experience building robust, scalable, and maintainable backend systems using SpringBoot
  • Experience in architecting and delivering complex web applications, with multiple examples of systems where you served as the lead engineer, driving both architectural decisions and hands-on implementation
  • You care about the technical architecture and design, ensuring that the solution is flexibly designed, performs efficiently and highly scalable
  • You actively contribute to code and stay hands on, conducting design and code reviews, mentoring engineers, and ensuring engineering excellence across the team
  • Proven experience designing and implementing cloud‑native applications, preferably on Pivotal Cloud Foundry (PCF) or other cloud platforms
  • Experienced working in an Agile environment with a global team that supports frequent production releases
  • Experience in designing and delivering high standard APIs, implementing API security models

Nice to have

Frontend development experience is a bonus

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