Lead Software Engineer

Mastercard • O'fallon, MO

6d • $140,000 - $231,000 • Onsite

About The Position

The Mastercard Treasury Services Program owns the settlement platform for all Mastercard’s transactions. The primary purpose of this role will be to lead a team of software engineers to deliver the next generation of this settlement platform.

Requirements

• Demonstrates deep expertise across software development, system design, and architecture
• Brings a strong foundation in data structures, algorithms, and distributed systems
• Leads with a quality-first mindset, emphasizing testing, security, and performance
• Excels at troubleshooting complex systems and driving resolution under pressure
• Proactively improves operability, reliability, and developer experience
• Influences technical direction and mentors' engineers across teams
• Java, microservices, RESTful APIs
• Frameworks: Spring (Spring Boot, Spring Data, Spring Batch, Spring REST, Spring Cloud, AOP), Hibernate
• API design and tooling best practices
• Cloud and DevOps: Kubernetes, Docker, Pivotal Cloud Foundry
• Databases: Oracle, PostgreSQL, Redis
• Tools: IntelliJ/Eclipse, Sonar, Git, Maven, Jenkins, CI/CD, Gatling, GitHub Copilot, Claude Code
• Proven ability to coach teams on full-stack development and end-to-end service ownership
• Strong communicator with the ability to clearly articulate complex architecture decisions to technical and business stakeholders
• Skilled in driving trade-off discussions across competing priorities (security, regulatory, technical debt, etc.)
• Experience leading advanced operational and failure testing practices such as chaos engineering
• Experience with Agile and modern SDLC practices: Scrum, Kanban, CI/CD, DevOps, and Quality Engineering
• Ability to operate under pressure while managing complex initiatives and competing priorities
• Adaptability in fast-changing environments with evolving technologies
• Strong hands-on experience designing solutions and full-stack development in modern technologies for large-scale enterprise systems
• Advanced experience building microservices in JAVA with the Spring Boot framework
• Working knowledge of application security principles: encryption/ decryption, PKI, Hashing, JWT, OAuth, OIDC, zero trust
• Proven experience working with Oracle/SQL Databases
• Extensive experience in software development and system design, data structures, algorithms, and a demonstrated ownership to maintain and troubleshoot complex large-scale distributed systems
• Experience in technical design activities to ensure alignment with Non-Functional Requirements, Solution Architecture and System Functional Design specifications
• Strong hands-on experience with: Unit, Integration, and Functional Testing frameworks and strategies
• Performance Engineering and system optimization
• Secure coding practices and application security principles
• Code reviews and engineering quality standards
• Operability engineering (observability, monitoring, reliability)
• Hands-on experience with AWS (Azure a plus), Kubernetes, and cloud-native technologies
• Strong experience with CI/CD pipelines and Infrastructure as Code (Terraform, CloudFormation)
• Experience with observability platforms (e.g., Splunk or equivalent)

Nice To Haves

• Knowledge and experience working within the security/ access domain is preferred

Responsibilities

• Lead end-to-end software design and architecture, translating business and system requirements into scalable, reliable, and maintainable solutions
• Define high- and low-level design artifacts, including APIs, data models, system interactions, and component boundaries
• Establish and enforce architecture standards, design patterns, and engineering best practices across teams
• Apply deep knowledge of data structures, algorithms, and distributed system design to solve complex performance and scalability challenges
• Own delivery of robust, secure, and high-performance software across backend platforms
• Drive engineering excellence in coding standards, modular design, and maintainability
• Build and enhance internal developer platforms using Backstage or similar frameworks, leveraging plugin-based architectures
• Develop data-driven user interfaces that surface observability and operational insights
• Define and implement comprehensive testing strategies, including: Unit testing, Integration testing, Functional/end-to-end testing
• Embed automated testing within CI/CD pipelines to enforce quality gates and prevent regressions
• Ensure systems meet correctness, reliability, and backward compatibility requirements at scale
• Lead performance engineering initiatives, including system benchmarking, load testing, and capacity planning
• Analyze system bottlenecks and optimize latency, throughput, and resource utilization across distributed architectures
• Ensure applications meet strict performance SLAs in high-volume, mission-critical environments
• Enforce secure coding practices and integrate security into every phase of the SDLC
• Design systems that meet enterprise security, regulatory, and compliance requirements
• Partner with security teams to proactively identify and remediate vulnerabilities
• Serve as a senior escalation point for complex production issues across distributed systems and user-facing platforms
• Lead root cause analysis, incident resolution, and postmortem activities
• Drive systemic improvements to prevent recurring issues and improve system reliability
• Lead rigorous code reviews, ensuring adherence to best practices in design, performance, security, and maintainability
• Mentor engineers and elevate team capability in software design, testing, debugging, and operational excellence
• Provide hands-on guidance in solving high-complexity technical problems across system layers
• Partner with product, platform, and business stakeholders to shape technical roadmaps and delivery priorities
• Own and deliver cross-functional initiatives spanning frontend, backend, and platform engineering
• Contribute to the Software Engineering Guild by sharing reusable frameworks, patterns, and innovations

Benefits

• insurance (including medical, prescription drug, dental, vision, disability, life insurance)
• flexible spending account and health savings account
• 16 weeks of new parent leave
• up to 20 days of bereavement leave
• 80 hours of Paid Sick and Safe Time
• 25 days of vacation time
• 5 personal days
• 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

What This Job Offers

• Job Type: Full-time
• Career Level: Senior