Senior Software Engineer

Our Purpose
Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.
Title and Summary
Senior Software Engineer
Senior Software Engineer (Full Stack)
At Mastercard, we are dedicated to delivering unparalleled customer experiences by pushing the boundaries of innovation. Our Network team is seeking a Senior Software Engineer to propel our customer experience strategy forward through unwavering innovation and adept problem-solving. The quintessential candidate is focused on the customer experience journey, exuding high motivation, an insatiable intellectual curiosity, exceptional analytical acumen, and a robust entrepreneurial mindset.
About The Role
- Build & deliver full-stack solutions: backend (Java/Python/Node.js) and frontend (React.js), with high coding and security standards.
- Design and develop around networked services (CDNs, load balancing, DNS, DHCP, IPAM); create and maintain public/private REST APIs.
- Collaborate & lead across product, design, security, and platform; mentor engineers; uphold OWASP/CWE-aligned practices.
- Document & communicate clearly: ADRs, runbooks, current API specs and system diagrams; share knowledge via reviews/tech talks.
- Design for scale & reliability: clean architecture, domain modeling, performance optimization; contribute to capacity planning and SLOs.
- Own quality end-to-end: write unit/integration/e2e tests; measure and improve coverage; practice TDD where it fits.
- Automate delivery: build and manage CI/CD pipelines in Jenkins with gating, blue/green and canary rollout strategies.
- Automate ops: use Chef (and related tooling) for configuration management, environment provisioning, and repeatable deployments.
- Troubleshoot in production: instrument services; analyze logs/metrics/traces; lead incident response/root-cause analysis and durable fixes.
- Drive continuous improvement: write automation scripts, provide timely support, and continuously learn to elevate team and platform outcomes.
To excel in this role, you should have:
- Bachelor's degree in computer science or a related field, or equivalent experience.
- 10+ years of professional software engineering experience delivering production systems.
- Strong understanding of data structures, algorithms, distributed systems, and secure coding.
- Solid grasp of networking basics: OSI layers, TCP/HTTP, DNS, DHCP, and IP address management (IPAM).
- HandOn experience in Java, Python, Node.js, React.js, REST API design and Microservice architectures.
- Proficiency with SQL and NoSQL databases.
- Experience building cloud-native, multi-tier applications and working with containers (Kubernetes/PCF).
- Hands-on CI/CD using Jenkins (pipeline-as-code, quality gates, safe rollout strategies).
- Configuration/infrastructure automation with Chef; comfortable writing scripts to automate tasks.
- Deep knowhow of DevSecOps and GitOps practices.
- Writing Unit, integration, and end-to-end tests; Using frameworks like JUnit/TestNG, PyTest, Jest/Playwright/Cypress.
- Strong production support skills using logs, metrics, and traces (e.g., ELK/OpenSearch, Prometheus/Grafana, OpenTelemetry) and can profile memory/CPU and diagnose network issues.
- Self-sufficient across the full lifecycle: from concept and design through implementation, testing, deployment, and monitoring.
Corporate Security Responsibility
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.