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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Lead Software Development 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), Application Programming Interfaces (APIs), Agile Methodology, User Authentication, Automation of Tests, Behavior-Driven Development, Cloud Computing, Cloud Engineering, Software Code Optimization, Software Quality, Code Review, Cyber Security, Continuous Integration, Data Structures, Software Design Patterns, DevOps, Distributed Systems, Fault Tolerance, Fraud Prevention and Detection, Infrastructure as a Service (IaaS), Node.Js, Object-Oriented Software Development, Platform as a Service (PAAS), Performance Tuning, Software Architecture, Scala (Programming Language), Secure Coding, Software Engineering, Software Systems, TypeScript, Software Vulnerability Management, Data Logging, Performance Testing, Test-Driven Development (TDD), Software Security, Event Driven Architecture, Build Management, Containerization, AngularJS, Integration Tests, Infrastructure Automation Frameworks, Information Technology, Domain Driven Design, Serverless Computing, Legacy Systems, Programming Languages, Microservices - **Published:** October 13, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=9543058e777cf5b6 ## About the Role * Bachelor's degree in Computer Science, Software Engineering, or a related technical field. * Advanced expertise in software engineering, distributed systems, object-oriented design, algorithms, and data structures. * Strong understanding of software architecture principles, design patterns, domain-driven design, and distributed system design. * Proficiency in one or more modern programming languages such as Java, Scala, Node.js, TypeScript, Angular, or similar technologies. * Demonstrated experience designing and developing enterprise-scale applications and services. * Strong experience with cloud platforms, including IaaS, PaaS, serverless technologies, containerization, and cloud-native architectures. * Experience with microservices, APIs, event-driven architectures, CI/CD pipelines, DevOps practices, and Infrastructure as Code. * Advanced knowledge of secure coding practices, application security concepts, and software risk mitigation techniques. * Experience designing and implementing automated testing frameworks and integration testing strategies. * Strong understanding of observability, monitoring, logging, performance tuning, and operational readiness. * Proven ability to troubleshoot and resolve complex technical issues across application, infrastructure, and integration layers. * Experience designing highly available and resilient systems that can withstand infrastructure and service failures. * Strong analytical, communication, collaboration, and problem-solving skills. * Experience working within Agile development environments. * Demonstrated ability to mentor and influence engineers through technical leadership and coaching. * Passion for continuous learning, innovation, and engineering excellence. ## Description The Cyber & Intelligence (C&I) organization is responsible for Mastercard's security and risk-related product development efforts, delivering innovative solutions focused on cybersecurity, authentication, fraud prevention, risk mitigation, and dispute resolution across the global payments ecosystem., We are seeking a highly skilled Lead Software Engineer to drive architecture, design, development, modernization, and operational excellence for mission-critical platforms. This role combines deep technical expertise, hands-on software engineering, architectural leadership, and mentoring to deliver secure, scalable, resilient, and high-performing solutions. Role * Drive the architectural design of software solutions, including dependent services, service interactions, integration patterns, technology standards, and governance practices. * Design and build scalable, resilient, fault-tolerant platforms that meet performance, security, availability, and maintainability requirements. * Lead technical decision-making and architecture reviews across multiple systems and engineering teams. * Act as a hands-on developer and architect, writing high-quality, secure, modular, maintainable, and testable code. * Create, evaluate, test, and deploy innovative technologies that optimize existing products and enable new business opportunities. * Develop and maintain technology roadmaps focused on platform modernization, performance improvements, reliability, and cost optimization. * Contribute across the full software development lifecycle including requirements analysis, design, development, documentation, testing, deployment, and ongoing support. * Design and implement comprehensive testing strategies including unit, functional, integration, regression, and automated testing to ensure solution quality and reliability. * Champion Test-Driven Development (TDD) and Behavior-Driven Development (BDD) practices across engineering teams. * Lead code reviews and enforce engineering standards to ensure code quality, maintainability, security, and consistency with organizational best practices. * Embed secure software development practices throughout the software development lifecycle, including secure design reviews, threat modeling, vulnerability remediation, and adherence to secure coding standards. * Drive performance engineering initiatives through capacity planning, performance testing, system optimization, and scalability improvements. * Own the operational characteristics of delivered solutions, including observability, monitoring, logging, alerting, reliability, maintainability, and recoverability. * Ensure systems are designed for operational excellence by implementing robust monitoring, diagnostics, and support capabilities. * Lead root cause analysis and resolution of complex production issues, driving continuous improvements to platform stability, resiliency, and service availability. * Guide the modernization of legacy platforms using microservices architectures, cloud-native engineering practices, anti-corruption layers, and strangler-pattern approaches. * Collaborate effectively with global engineering, product, operations, and security teams. * Mentor engineers on software architecture, design patterns, engineering practices, coding standards, and emerging technologies. * Serve as a technical leader and ambassador by presenting at internal forums, industry conferences, and engineering communities., 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.