MastercardSenior Software Engineer
Mastercard is hiring a Senior Software Engineer in Lisbon, Portugal. Level rates it ; you can apply on Mastercard.
Level's read on this job
- Level rates this software engineer role Little AI ●○○○: aI is not part of the work.
- Tools and skills the posting cites include Java, Spring and Angular.
- Level classifies it as a senior role.
- Level lists 967 other open roles at Mastercard.
AI in this role
Design and develop secure distributed systems and blockchain-based products using Java and Spring.
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 EngineerSenior Software Engineer, Blockchain TeamLocation: 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
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.
How we rate this
Senior Software Engineer at Mastercard rates 0 out of 100 for how much of the daily work is AI. That makes it Little AI (AI Level 1 of 4). The level is about AI in the job, not seniority.
Little AI. AI is not part of the work.
- ●●●● Builds AI80 to 100
- ●●●○ Works on AI60 to 79
- ●●○○ Uses AI40 to 59
- ●○○○ Little AI0 to 39
Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.
Prepare for this job
Built from this posting and from similar jobs on Level.
Skills and AI tools this role asks for
Also common in software engineer jobs at this level
Pay
- Typical software engineer job
- $167k
This posting doesn't list pay. Use the typical software engineer figure when pay comes up. See software engineer jobs
Questions you could be asked
- Tell me about a project where software engineering was part of your work. What did you do?
- Tell me about a project where blockchain was part of your work. What did you do?
- Tell me about a project where distributed systems was part of your work. What did you do?
- Tell me about a project where microservices was part of your work. What did you do?
- Walk me through how you've used Java in your day-to-day work.
Adapt your resume
- List these exact terms on your resume: Software Engineering, Blockchain, Distributed Systems, Microservices, and Java. An applicant tracking system matches the wording, not the idea.
- Attach one line of real, concrete experience to at least one of them. A tool named with nothing behind it rarely survives a human read.
Get your CV reviewed before you apply
Send your CV and the role you want next. Your review arrives by email within 3 days.
Get new software engineer jobs by email
One email a week, each job rated for how much AI is in the work. No recruiter spam, unsubscribe in one click.
Free.
Similar roles
Software Engineering roles that involve little AI, at other companies.
What kind of AI work fits you?
Answer 12 practical questions in about three minutes. Get a simple profile, the work it points to, and live roles to explore next.
Find my next step