Senior Software Engineer

expertise in API architecture, API design, microservices, and cloud-native engineering, with hands-on development experience using Java, Spring Boot, and Python. The role will define API standards, create reusable platform capabilities, and deliver secure, resilient, scalable, and high-performing APIs on AWS. The individual will collaborate with Product Managers, Solution Architects, Security teams, and Engineering teams to translate business needs into well-designed API products aligned with enterprise architecture and engineering standards. Role & Responsibilities

• Define end-to-end API architecture and integration strategies for enterprise applications and platform services.
• Design secure, scalable, reusable, and consumer-focused APIs and microservices using API-first principles.
• Establish and govern API standards for resource modeling, error handling, pagination, versioning, compatibility, idempotency, and lifecycle management.
• Create and review Open API/Swagger specifications that guide implementation, documentation, testing, and integration.
• Build cloud-native backend services that are resilient, highly available, observable, maintainable, and performant.
• Apply microservices, distributed-system, integration, and orchestration patterns to meet functional and non-functional requirements.
• Develop reusable frameworks, shared services, SDKs, and engineering accelerators that improve consistency and delivery efficiency.
• Partner with Product, Architecture, Security, and Engineering teams to translate business needs into compliant technical solutions.
• Contribute to design and code reviews, production issue resolution, root cause analysis, modernization, and continuous improvement.
• Influence API strategy, platform evolution, engineering standards, automation, and technology adoption across the organization.

Required Qualifications Education & Experience

• Bachelor's or Master's degree in Computer Science, Software Engineering, Information Technology, or a related discipline.
• Proven software engineering experience focused on API development, integration, distributed systems, and enterprise applications.
• Demonstrated experience designing and implementing enterprise-scale APIs and microservices in Agile and Dev Ops environments.

Technical Skills / Must Have

• API architecture and design: REST, API-first delivery, resource modeling, Open API/Swagger, governance, lifecycle management, versioning, backward compatibility, and end-to-end architecture across UI, API, services, data, and cloud layers.
• API quality and testing: Consumer-driven contract testing, API mocking, schema validation, automated compatibility checks, functional testing, and quality gates.
• Java and Spring Boot: Java, Spring Boot, Spring Web, Spring Security, validation, exception handling, dependency management, testing, and microservices development.
• Python: API and service development using common frameworks, with emphasis on modularity, security, testing, and maintainability.
• AWS: Hands-on experience with Lambda, ECS, API Gateway, EC2, S3, RDS, IAM, SNS/SQS, Cloud Watch, and Secrets Manager.
• API security: OAuth 2.0, Open ID Connect, JWT, m TLS, API keys, role-based access control, input validation, rate limiting, throttling, and secret management.
• Distributed systems: Scalability, resilience, fault tolerance, timeouts, retries, circuit breakers, idempotency, caching, service discovery, and observability.
• Data and SQL: Oracle, Postgre SQL, SQL Server, or similar databases, including data modeling, query optimization, and performance tuning.
• Dev Ops and containers: Git, Jenkins or Git Hub Actions, automated testing, static analysis, security scanning, deployment automation, Docker, and Kubernetes.

Preferred Qualifications / Good-to-Have Skills

• Infrastructure and messaging: Terraform, reusable infrastructure modules, Kafka, event streaming, asynchronous messaging, and event-driven integration patterns.
• API platforms: Apigee, Kong, Mule Soft, AWS API Gateway, or similar API management and gateway technologies.
• Specification-driven development: Specifications as the source of truth for design, contracts, code generation, documentation, testing, validation, and implementation.
• AI-assisted engineering: Git Hub Copilot, Microsoft Copilot, Claude, Cursor, agent-based workflows, prompt/context design, automated quality checks, or AI/ML service integration.
• UI development: Working knowledge of React, Java Script or Type Script, HTML, and CSS to build or support lightweight API-consuming interfaces.
• Observability: Splunk, Dynatrace, Grafana, Prometheus, Open Telemetry, or similar platforms.
• Industry experience: Payments, financial services, fintech, or another highly regulated industry.

Key Competencies

• Strong API architecture and design mindset.
• Excellent analytical, troubleshooting, and problem-solving skills.
• Strong ownership, accountability, and focus on business outcomes.
• Ability to influence technical direction and communicate complex decisions clearly.
• Effective collaboration and stakeholder-management skills.
• Commitment to security, reliability, engineering excellence, continuous learning, and innovation.

Success Measures

• Delivers secure, scalable, resilient, and reusable APIs and cloud-native services.
• Improves API consistency, governance, usability, performance, and developer experience.
• Drives adoption of API-first and cloud-native engineering practices.
• Creates reusable standards, frameworks, and accelerators that increase delivery efficiency.
• Contributes to the long-term API architecture and integration strategy.
• Demonstrates technical leadership, collaboration, ownership, and accountability.

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. Everyone wants easier ways to pay; we invent them. Checkout lines are slow; we speed them along. Merchants want more sales; we give them data and insights. People need financial access; we connect them. Corporate purchasing is complicated; we make it simple. Commuters are busy; we speed them on their way. Governments need greater efficiencies; we help create them. Small businesses are virtual; we give them access to a world of buyers. Retailers want to fight fraud; we provide the tools.