Lead Software Engineer — Connectivity

Location: Warsaw, Poland, Gdansk, Poland

Time Type: Full time

Job Description

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Lead Software Engineer — Connectivity

Overview
This role sits within Mastercard’s Open Finance Europe – Connectivity team, building and operating scalable API connectivity to financial institutions across Europe.

As a Lead Software Engineer, you will own end-to-end delivery of secure, reliable connectivity services. This is a hands-on role focused on solving complex problems, driving technical decisions, and delivering high-quality systems from design through production.
You will partner with Product and business stakeholders to deliver new capabilities, improve platform reliability, and scale integrations across markets.

Core Responsibilities
• Own end-to-end delivery of engineering solutions—from design through development, deployment, and production support
• Solve complex technical problems and drive system design decisions
• Design, build, and operate scalable APIs and backend services
• Review code and uphold high standards of quality, performance, and maintainability
• Apply best practices across SDLC, testing, security, and observability
• Collaborate with Product, Architecture, Security, and SRE teams
• Implement robust testing strategies (unit, integration, end-to-end)
• Drive automation and improvements in developer productivity and operational efficiency
• Mentor engineers and support them in solving technical challenges and growing their skills

Technology Stack
• C#, .NET 10, Web APIs
• Java/Spring Boot (plus)
• Azure (App Services, Blob Storage, KeyVault, CI/CD)
• AWS (Microservices, S3, Redis, CI/CD pipelines)
• PostgreSQL, Flyway
• Generative AI tools (GitHub Copilot, etc.)

All About You
Must Have
• 8–10 years of professional software engineering experience
• Strong hands-on experience building cloud-based, highly available systems
• Deep expertise in backend engineering (API design, reliability, production support)
• Proven ability to solve complex technical problems and influence design decisions
• Experience delivering and operating end-to-end systems in production environments
• Strong collaboration skills with Product and business stakeholders
• Familiarity with banking/payments/open banking (PSD2) environments
• Strong communication and problem-solving skills
Nice to Have
• Experience with Open Banking or bank connectivity at scale
• Experience with AI-assisted engineering tools (Copilot, etc.)
• Track record of improving efficiency through automation
• Familiarity with infrastructure-as-code and platform governance

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

• Abide by Mastercard’s security policies and practices;

• Ensure the confidentiality and integrity of the information being accessed;

• Report any suspected information security violation or breach, and

• Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.