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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - Blockchain - **Company:** Mastercard - **Location:** Arlington, VA, United States - **Experience:** Expert - **Salary:** $132,000.0 - $212,000.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Agile Methodology, Artificial Intelligence, Cloud Engineering, Software Quality, Code Review, Cyber Security, Information Systems, Programming Tools, Digital Assets, Revision Control Systems, Automation of Marketing, Object-Oriented Software Development, Quorum, E2e Testing, Blockchain, Software Engineering, Toolchain, TypeScript, ReactJS, Large Language Models, Spring-boot, Hyperledger, Containerization, AngularJS, Information Technology, Ethereum, Solidity, Web3.js, Front End Software Development, Docker, Jenkins - **Published:** September 11, 2026 - **Apply:** https://mastercard.wd1.myworkdayjobs.com/CorporateCareers/job/Arlington-Virginia/Senior-Software-Engineer---Blockchain_R-290125 ## About the Role * Proven experience as a Software Engineer, Software Developer, or similar engineering role. * Strong expertise in Ethereum/EVM and Web3 development using frameworks such as ethers.js, web3.js, or equivalent technologies. * Proficiency in Solidity and hands-on experience designing, developing, and deploying production-grade smart contracts. * Deep understanding of blockchain fundamentals, including consensus mechanisms, transaction lifecycle, gas optimization, wallet infrastructure, and security best practices. * Experience with smart contract development frameworks such as Hardhat, Foundry, or similar toolchains. * Strong knowledge of software engineering principles, system design, and modern development methodologies. * Experience working with containerization and orchestration technologies such as Docker and Kubernetes. * Familiarity with CI/CD pipelines and tools such as Jenkins or equivalent automation platforms. * Proficiency with source control systems and collaborative development practices in multi-engineer environments. * Experience building and maintaining automated unit, integration, and end-to-end testing solutions. * Ability to make sound technical decisions, lead initiatives, and mentor engineers through influence rather than formal authority. * Comfortable working autonomously in fast-paced Agile environments while balancing competing priorities. * Strong commitment to code quality, maintainability, security, and continuous improvement. * Strong communication and collaboration skills, with the ability to explain technical concepts and influence decisions across technical and non-technical audiences. * Bachelor's degree in Computer Science, Engineering, Information Systems, or equivalent practical experience., * Experience with enterprise blockchain protocols such as Hyperledger Besu, Quorum, or Canton. * Familiarity with Layer 2 scaling solutions, including Polygon, Arbitrum, or Optimism. * Knowledge of smart contract security, common vulnerability patterns, and audit processes. * Familiarity with non-EVM blockchain ecosystems, such as Solana. * Proficiency in Java or another object-oriented backend programming language. * Experience with Spring or Spring Boot. * Familiarity with TypeScript and frontend frameworks such as React or Angular. * Experience with AI and agentic engineering, including LLM integration, AI-powered developer tools, or autonomous agent frameworks. ## Description Mastercard is looking for a talented Senior Software Engineer - 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 talented engineers to design, develop, and deliver high-performance Ethereum/EVM and Web3 solutions, with a strong focus on enterprise-grade architecture, scalability, security, and reliability. 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. Role: * Design and develop scalable, production-grade smart contract systems and Web3 integrations within the Ethereum/EVM ecosystem. * Lead technical design and architecture discussions, making sound engineering decisions while balancing scalability, security, performance, and maintainability. * Translate complex business requirements into robust blockchain-based solutions aligned with enterprise standards and best practices. * Participate in architecture reviews, code reviews, and technical design sessions to drive engineering excellence. * Collaborate with product, compliance, security, and engineering teams throughout the software development lifecycle. * Mentor and support engineers by sharing knowledge, promoting best practices, and fostering technical growth across the team. * Evaluate emerging blockchain technologies, protocols, development frameworks, and industry trends to identify new opportunities and improvements. * Contribute to the continuous evolution of engineering practices, tooling, automation, and software quality standards. * Develop, test, deploy, and support applications and services in cloud-native, containerized environments. * Champion secure coding practices and operational excellence across all phases of development and delivery., 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. ## Related Videos - [Future-Proofing FinTech With Blockchain Technology](https://www.wearedevelopers.com/videos/808-future-proofing-fintech-with-blockchain-technology) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Fireside Chat - In conversation with Werner Vogels, CTO of Amazon.com](https://www.wearedevelopers.com/videos/100265-fireside-chat-in-conversation-with-werner-vogels-cto-of-amazon-com) - [The Road to MLOps: How Verivox Transitioned to AWS](https://www.wearedevelopers.com/videos/1050-the-road-to-mlops-how-verivox-transitioned-to-aws) - [Enterprise-Cloud-Native - Fast-Paced Development & Deployment in a Highly Secure Banking Environment](https://www.wearedevelopers.com/videos/671-enterprise-cloud-native-fast-paced-development-deployment-in-a-highly-secure-banking-environment) - [Our GitOps approach for deploying an Identity Provider and an API Gateway in a SaaS company](https://www.wearedevelopers.com/videos/776-our-gitops-approach-for-deploying-an-identity-provider-and-an-api-gateway-in-a-saas-company) ## Related Articles - [7 tips on how to become a blockchain developer](https://www.wearedevelopers.com/magazine/53-7-tips-on-how-to-become-a-blockchain-developer) - [From Hype to Code: Real Blockchain Use Cases for Developers](https://www.wearedevelopers.com/magazine/620-from-hype-to-code-real-blockchain-use-cases-for-developers) - [Why Blockchain? 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