Senior Software Engineer

MasterCard; Lisboa; Presencial; EUR 90 000 - 130 000; Tempo integral

Resumo da oferta

Mastercard in Lisbon is seeking a Senior Software Engineer for our Blockchain Team. You will design, develop, and maintain secure, scalable distributed systems that power blockchain-based products and services.

You will collaborate with cross-functional teams, mentor junior engineers, and help drive architecture decisions, CI/CD, and performance improvements in a fast-paced, security-focused environment.

Qualificações

• 5+ years of professional software engineering experience.
• Bachelor's or Master's degree in CS or Software Engineering.
• Strong Java and Spring expertise.
• Experience with REST APIs and GraphQL.
• Frontend skills with Angular.
• Cloud experience AWS or Azure.
• CI/CD, Docker, Kubernetes, and microservices.
• Excellent communication and mentoring skills.

Responsabilidades

• Design, develop, and maintain blockchain platforms.
• Build secure backend services and APIs.
• Integrate with blockchain networks and cryptographic services.
• Mentor engineers and drive best practices.
• Collaborate with product, security, and operations.
• Drive CI/CD and automation.
• Ensure system reliability and performance.

Conhecimentos

Java

Spring

REST APIs

GraphQL

Angular

CI/CD

Docker

Kubernetes

AWS

Azure

Distributed Systems

Blockchain

Security

Leadership

Formação académica

Bachelor's degree

Master's degree

Ferramentas

Docker

Kubernetes

AWS

Azure

Descrição da oferta de emprego

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 system scalability, maintainability, and performance.
• Influencing architectural decisions and engineering standards.
• Supporting team growth through technical leadership and mentorship.
• Driving innovation in blockchain, security, and distributed systems technologies.

Key Competencies

• Technical Leadership
• Distributed Systems Design
• Blockchain Architecture
• Secure Software Development
• Cloud-Native Engineering
• Problem Solving
• Collaboration and Communication
• Mentorship and Coaching

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.

Everyone wants easier ways to pay; we invent them. Checkout lines are slow; we speed them along. Merchants want more sales; we give them data and insights. People need financial access; we connect them. Corporate purchasing is complicated; we make it simple. Commuters are busy; we speed them on their way. Governments need greater efficiencies; we help create them. Small businesses are virtual; we give them access to a world of buyers. Retailers want to fight fraud; we provide the tools.