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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Lead Software Engineer - **Company:** Mastercard - **Location:** O'Fallon, MO, United States - **Experience:** Expert - **Salary:** $140,000.0 - $231,000.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Adobe InDesign, Application Programming Interfaces (APIs), Agile Methodology, Amazon Web Services, Aspect-Oriented Programming, Automation of Tests, Unit Testing, Microsoft Azure, Cloud Computing, Cloud Foundry, Software Code Optimization, Code Review, Cyber Security, Computer Networks, Continuous Integration, Data Security, Data Structures, Software Debugging, Software Design Patterns, DevOps, Distributed Systems, Eclipse (Software), Hibernate (Java), IntelliJ IDEA, Spring Framework, PostgreSQL, Load Testing, Apache Maven, Modular Design, OAuth, OpenID, Oracle Databases, Oracle (Applications), Public Key Infrastructure, Scrum Methodology, Software Architecture, Systems Development Life Cycle, Redis, Reliability Engineering, Zero Trust Network Access, JSON Web Token, Secure Coding, Software Engineering, Software Requirements Analysis, SONAR (Symantec), SQL Databases, Strategies of Testing, Spring Cloud, GitHub Copilot, Claude Code, Spring-boot, Software Security, Gatling, Reliability of Systems, Technical Debt, Backend, Git, Cloudformation, Spring Data, Containerization, Integration Tests, Kubernetes, Information Technology, Low Latency, Data Analytics, Front End Software Development, Api Design, Restful APIs, Terraform, Splunk, Spring Batch, Docker, Jenkins, Microservices - **Published:** November 6, 2026 - **Apply:** https://www.careerbuilder.com/job-details/lead-software-engineer-o-fallon-mo--605e428a-40d4-4844-837d-8617973a7fba ## About the Role Software Engineering, Software Engineering, Information/Data Security (InfoSec), Computer Networks, Treasury, Team Lead/Manager, Software Architecture, Software Architecture Design, Business Solutions, Systems Scalability, * 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) * Bachelor's or Master's degree in Computer Science, Engineering, or related field preferred * Knowledge and experience working within the security/ access domain is preferred ## Description 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., Software Design & Architecture * 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 Software Development Excellence * 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 Testing Strategy & Quality Engineering * 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 Performance Engineering * 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 Secure Coding & Compliance * 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 Troubleshooting & Incident Management * 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 Code Review & Technical Leadership * 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 Collaboration & Ownership * 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 All About You We are looking for someone who: * 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 Technologies * 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, 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.