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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - **Company:** Mastercard - **Location:** O'Fallon, MO, United States - **Experience:** Expert - **Salary:** $115,000.0 - $184,000.0 - **Contract:** Permanent contract - **Skills:** Private Networks, Application Programming Interfaces (APIs), Agile Methodology, Amazon Web Services, User Authentication, Cloud Computing, Cloud Engineering, Software Quality, Code Review, Cyber Security, Databases, Data Structures, Linux, DevOps, Distributed Systems, Protocol Buffers, Python (Programming Language), Key Management, Network Load Balancing, Network Service, Performance Tuning, Software Architecture, Secure Coding, Software Engineering, Software Technical Review, Software Vulnerability Management, Data Logging, Enterprise Software Applications, Test-Driven Development (TDD), Spring Cloud, Cloud Connect, Software Application Programming, Reliability of Systems, Amazon Virtual Private Cloud (VPC), Git, Containerization, Integration Tests, Kubernetes, Information Technology, Route53, Serverless Computing, Docker, Jenkins, Artifactory, Golang - **Published:** October 20, 2026 - **Apply:** https://www.techcareers.com/job.asp?id=3454768090&tx=YT101THZ&pt=1&aff=0B19D771-A501-4A5E-8338-2A822B784D54&utm_source=Job%20Feed&utm_medium=textkernel&utm_campaign=DE&utm_term=0B19D771-A501-4A5E-8338-2A822B784D54 ## About the Role * Bachelor's degree in Computer Science, Management Information Systems, Engineering, or related field. * 7+ years of software engineering experience designing, developing, and supporting enterprise applications. * 2+ years of hands-on experience developing applications using Go (Golang). * Experience designing, deploying, and operating cloud-native solutions on AWS. * Strong understanding of AWS networking services including VPC, Transit Gateway, PrivateLink, Route 53, Network Load Balancers, and Direct Connect. * Experience building and operating containerized applications using Kubernetes, Amazon EKS, Docker, and related cloud-native technologies. * Strong understanding of distributed systems concepts, scalability patterns, performance optimization, and efficient data structure design. * Experience conducting code reviews and promoting engineering best practices, software quality, and secure coding standards. * Knowledge of secure software development practices including authentication, authorization, encryption, secrets management, vulnerability remediation, and application security testing. * Experience implementing and maintaining automated testing frameworks, including unit, functional, and integration testing. * Experience with Test-Driven Development (TDD) methodologies. * Experience with protocol buffers and gRPC. * Experience with Python 3.8 or higher is preferred. * Strong understanding of CI/CD pipelines and modern DevOps practices using Git, Jenkins, Artifactory, Docker Registry, and related technologies. * Experience building and supporting applications on Linux platforms. * Experience implementing observability and operational readiness practices including logging, monitoring, alerting, and incident response. * Agile software delivery experience in a globally distributed engineering environment ## Description We are seeking an experienced Senior Software Engineer with strong expertise in Golang, cloud-native application development, and AWS-based solutions to support Mastercard's Cloud Connect initiatives. The role will focus on building secure, scalable connectivity platforms that enable customers to connect to Mastercard services from public cloud environments and private networks through modern cloud-native architectures., * Design, develop, and maintain secure, scalable, and resilient cloud-native applications and services using Golang and AWS technologies to support Mastercard's Cloud Connect initiatives. * Collaborate cross-functionally with product, architecture, engineering, and operations teams to design scalable solutions, systems, APIs, and databases that meet functional and non-functional requirements. * Contribute to software architecture, technical design reviews, and architectural decision-making, ensuring solutions are maintainable, performant, secure, and aligned with enterprise standards. * Design and optimize data structures, algorithms, and processing patterns to support high-volume distributed systems and efficient resource utilization. * Participate in the complete software development lifecycle, including requirements analysis, design, development, testing, deployment, monitoring, and ongoing support. * Design, develop, and maintain automated unit, functional, and integration tests while promoting test-driven development practices. * Conduct code reviews and provide technical mentorship to engineering team members, promoting coding standards, software quality, maintainability, and engineering best practices. * Apply secure coding principles throughout the software development lifecycle, proactively identifying and remediating vulnerabilities through code reviews, security testing, and adherence to Mastercard security standards. * Contribute to operational excellence by implementing observability, monitoring, logging, alerting, and reliability best practices for cloud-native services. * Perform root cause analysis, troubleshoot complex production issues, and lead performance tuning efforts to improve system reliability, scalability, and efficiency. * Work with business partners and stakeholders to understand business needs and translate requirements into technical solutions., 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.