Software Engineer II Blockchain at Mastercard in 📍United States

Job description

• Mastercard is looking for a talented Software Engineer II - Blockchain to join the Mastercard Blockchain and Digital Assets Engineering team. In this role, you will be part of a highly collaborative Agile team building innovative, scalable products leveraging blockchain technologies and components for global markets.
• You will work alongside experienced engineers to design, develop, test, and support Ethereum/EVM and Web3 solutions, contributing to enterprise-grade applications with a focus on scalability, security, reliability, and performance.
• Our team is built on a foundation of research and development, innovation mentality, thinking through new product lines using Blockchain / Distributed ledger technology, managing new products from inception to market validation and engaging strategically with start-ups to shape the future of commerce within the digital assets space with and for our customers. At Mastercard you will help architect and lead the future of commerce globally.
• This team will have a major focus on adopting Blockchain technology to bring innovative payment solutions to market. Engineers on this team will also have the opportunity to work alongside cutting-edge AI tools and agentic systems as part of our broader innovation agenda.
• This is a hybrid role based in Arlington, VA, requiring three days per week onsite.

Responsibilities

• Develop, test, deploy, and maintain blockchain applications, smart contracts, and Web3 integrations within the Ethereum/EVM ecosystem.
• Collaborate with senior engineers, architects, and product teams to deliver secure, scalable, and reliable solutions.
• Participate in technical design discussions and contribute ideas to address business and technical challenges.
• Translate business requirements into high-quality code aligned with engineering standards and best practices.
• Participate in code reviews, testing activities, and development processes to ensure software quality and maintainability.
• Work closely with product, compliance, security, and engineering teams throughout the software development lifecycle.
• Troubleshoot and resolve issues in development, test, and production environments.
• Contribute to improving engineering processes, automation, tooling, and development practices.
• Develop and support applications running in cloud-native, containerized environments.
• Follow secure coding practices and operational excellence standards throughout development and delivery.

Requirements

• Experience as a Software Engineer, Software Developer, or similar engineering role.
• Experience developing applications using Ethereum/EVM and Web3 technologies such as ethers.js, web3.js, or similar frameworks.
• Working knowledge of Solidity and experience developing or maintaining smart contracts.
• Understanding of blockchain fundamentals, including transactions, wallets, gas concepts, and common security considerations.
• Familiarity with smart contract development frameworks such as Hardhat, Foundry, or similar toolchains.
• Knowledge of software engineering principles, object-oriented programming, and modern development practices.
• Experience with programming languages such as Java, TypeScript, JavaScript, or similar technologies.
• Familiarity with source control systems such as Git and collaborative software development practices.
• Experience building or maintaining automated unit and integration tests.
• Exposure to containerization technologies such as Docker and cloud-native development concepts.
• Familiarity with CI/CD pipelines and automation tools.
• Ability to learn new technologies quickly and contribute effectively in a fast-paced Agile environment.
• Strong problem-solving, communication, and collaboration skills.
• Commitment to code quality, maintainability, security, and continuous improvement.
• Bachelor's degree in Computer Science, Engineering, Information Systems, or equivalent practical experience.
• Experience with enterprise blockchain platforms such as Hyperledger Besu, Quorum, or Canton.
• Familiarity with Layer 2 scaling technologies, including Polygon, Arbitrum, or Optimism.
• Knowledge of smart contract security practices and common vulnerability patterns.
• Familiarity with non-EVM blockchain ecosystems such as Solana.
• Experience with Java and frameworks such as Spring or Spring Boot.
• Familiarity with TypeScript and frontend frameworks such as React or Angular.
• Exposure to AI-powered developer tools, LLM integrations, or agentic development frameworks.
• Experience developing applications in cloud environments such as AWS, Azure, or Google Cloud.

Skills

Required

• Ethereum/EVM
• Web3
• ethers.js
• web3.js
• Solidity
• Smart contracts
• Blockchain fundamentals
• Hardhat
• Foundry
• Object-oriented programming
• Java
• TypeScript

Preferred

• Hyperledger Besu
• Quorum
• Canton
• Polygon
• Arbitrum
• Optimism
• Smart contract security
• Solana

Benefits

• In line with Mastercard’s total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role.
• The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience.
• Mastercard benefits for full time (and certain part time) employees generally include: insurance (including medical, prescription drug, dental, vision, disability, life insurance); flexible spending account and health savings account; paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave); 80 hours of Paid Sick and Safe Time, 25 days of vacation time and 5 personal days, pro-rated based on date of hire; 10 annual paid U.S. observed holidays; 401k with a best-in-class company match; deferred compensation for eligible roles; fitness reimbursement or on-site fitness facilities; eligibility for tuition reimbursement; and many more.
• Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.
• Arlington, Virginia: $106,000 - $169,000 USD