# Senior Software Engineer at Mastercard

Mastercard is hiring a Senior Software Engineer in Lisbon, Portugal. Level rates it Little AI ●○○○; you can [apply on Mastercard](https://jobsbylevel.com/go/3dfa1a07-06fe-4bec-937b-37a771158a3c?utm_medium=ai-agent).

AI Level 1, AI centrality 0 out of 100. Lisbon, Portugal (DeHouse).

## Details

- Company: [Mastercard](https://jobsbylevel.com/companies/mastercard)
- AI level: AI Level 1 (score 0 out of 100)
- Location: Lisbon, Portugal (DeHouse)
- Posted: September 11, 2026
- Apply: https://jobsbylevel.com/go/3dfa1a07-06fe-4bec-937b-37a771158a3c?utm_medium=ai-agent
- Free CV review for this job: https://jobsbylevel.com/cv-review?job=senior-software-engineer-at-mastercard-eb0d20

## Prepare for this job

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## 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 Senior Software Engineer Senior Software Engineer, Blockchain Team Location: Lisbon, Portugal Experience: 5+ years Employment Type: Full-time Overview We are seeking a highly skilled Senior Software Engineer to join our Blockchain Team in Lisbon. In this role, you will design, develop, and maintain secure, scalable, and high-performance distributed systems that support blockchain-based products and services. You will collaborate with cross-functional teams to deliver innovative solutions while driving engineering excellence and mentoring other developers. Key Responsibilities • Design, develop, and maintain blockchain platforms and distributed applications. • Build secure and scalable backend services using modern software engineering practices. • Develop integrations with blockchain networks, digital asset platforms, and cryptographic services. • Create and maintain APIs, microservices, and cloud-native applications. • Participate in architecture discussions and influence technical direction. • Ensure high availability, performance, security, and reliability of production systems. • Experience with cryptographic protocols, key management, and secure data handling practices. • Conduct code reviews and mentor junior and mid-level engineers. • Collaborate with Product Managers, Architects, Security Engineers, and Operations teams. • Drive automation, testing, CI/CD, and operational excellence initiatives. • Troubleshoot complex technical issues across distributed environments. Required Qualifications • Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field. • 5+ years of professional software engineering experience. • Strong proficiency in Java and Spring. • Experience developing full-stack applications, including scalable backend services and modern, responsive frontend solutions. • Strong hands-on experience with frontend framework Angular. • Experience building responsive, accessible, and user-friendly web applications. • Strong understanding of REST APIs, GraphQL, and frontend-backend integration patterns. • Experience building scalable microservices and distributed systems. • Strong understanding of cloud platforms such as AWS or Azure. • Solid knowledge of software design patterns, system architecture, and performance optimization. • Experience with CI/CD pipelines, containerization, Docker, and Kubernetes. • Familiarity with modern testing frameworks for both frontend and backend development. • Excellent problem-solving, communication, and collaboration skills. • Ability to lead technical initiatives, mentor engineers, and drive best practices across the software development lifecycle. Preferred Qualifications • Experience with blockchain technologies such as Ethereum, Hyperledger, Bitcoin, Polygon, Solana, or similar platforms. • Understanding of cryptography, PKI, digital signatures, encryption, and secure key management. • Experience developing user interfaces for blockchain or digital asset platforms. • Knowledge of Web3 technologies, wallet integrations, and smart contract interactions. • Experience with event-driven architectures, messaging systems, and real-time applications. • Experience designing and implementing secure authentication and authorization solutions (OAuth2, OIDC, MFA). • Previous experience leading technical projects and mentoring engineers. What Success Looks Like • Delivering reliable and secure blockchain solutions to production. • Improving

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