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About the Role

As a Senior Software Engineer, you will act as a technical owner and key contributor across the full software lifecycle, from architecture and design through production operations. You will help build scalable cloud-native software solutions from the ground up, solving complex technical problems at scale.

Responsibilities

• Design and evolve scalable, maintainable, and secure software solutions, translating business and technical requirements into well-structured system designs.
• Contribute to and influence architecture decisions, defining patterns, standards, and best practices for APIs, event driven systems, microservices, and cloud-native platforms.
• Evaluate technical trade-offs and guide design decisions that ensure long-term system sustainability.
• Independently design, build, test, deploy, and maintain high-quality software components and services.
• Apply advanced data structures and algorithms to solve complex problems efficiently and optimize system behavior.
• Lead and actively participate in code reviews, ensuring high standards for readability, maintainability, performance, and security.
• Coach and mentor peers through technical feedback, pairing, and informal guidance.
• Proactively analyze and optimize application and system performance, scalability, and reliability.
• Design and execute performance, load, and stress testing strategies.
• Identify bottlenecks and drive tuning efforts across application, data, and infrastructure layers.
• Define and maintain comprehensive unit, functional, and integration testing strategies.
• Promote test automation and quality gates to ensure consistent and reliable delivery.
• Ensure systems behave predictably under normal and peak workloads.
• Design systems with operational readiness in mind, including observability, logging, monitoring, alerting, and resilience.
• Take ownership of production health within owned areas, participating in incident diagnosis, root-cause analysis, and preventive improvements.
• Continuously improve reliability, maintainability, and supportability throughout the system lifecycle.
• Apply secure coding practices throughout the SDLC, adhering to Mastercard security standards and industry frameworks (e.g., OWASP, CWE).
• Ensure vulnerabilities are proactively identified and mitigated using automated tooling and secure design principles.
• Partner closely with Product, Architecture, Site Reliability, and Security teams to deliver aligned solutions.
• Influence team and cross-team technical decisions through expertise and data-driven recommendations.
• Contribute to engineering communities, guilds, and knowledge-sharing initiatives across Mastercard.
• 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.
• Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.

Requirements

• Proficiency and hands-on experience building agentic frameworks in Python/TypeScript.
• Strong experience and proficiency with modern web stacks, including Angular and React, along with JavaScript/TypeScript and Node.js / Java microservices.
• Proven experience with backend development with JAVA required.
• Solid understanding of data structures, algorithms, and performance optimization techniques.
• Hands-on experience building and operating cloud-native systems (AWS/Azure), including APIs, event-driven services, and distributed data stores (SQL, key-value, or document databases).
• Proven expertise in secure coding practices and use of static and dynamic security analysis tools (e.g., Sonar, Checkmarx).
• Strong experience with Git-based workflows, branching strategies, and leading effective peer code reviews.
• Demonstrated ability to design, implement, and maintain unit, service, and integration tests.
• Experience analyzing and troubleshooting issues across applications and systems, including production environments.
• Deep understanding of modern SDLC methodologies (Scrum, Kanban, SAFe) and when to apply them.
• Experience with CI/CD pipelines, automation, and containerized deployments.
• Familiarity with observability tools and operational best practices for mission-critical systems.

Skills

• Python
• TypeScript
• Angular
• React
• JavaScript
• Node.js
• Java
• Spring Boot
• Data Structures
• Algorithms
• Performance Optimization
• AWS
• Azure
• APIs
• Event-driven services
• SQL
• Key-value databases
• Document databases
• Secure coding practices
• Sonar
• Checkmarx
• Git
• Unit testing
• Service testing
• Integration testing
• CI/CD
• Automation
• Containerized deployments
• Observability tools

Location

• Arlington, Virginia
• O'Fallon, Missouri

Work Type

• Full-time

Experience Level

• Senior

Education Level

• Bachelor's degree in Computer Science, Engineering, Information Technology, or equivalent practical experience

Salary/Compensations

• Arlington, Virginia: $132,000 - $212,000 USD
• O'Fallon, Missouri: $115,000 - $184,000 USD

Benefits

• Insurance (including medical, prescription drug, dental, vision, disability, life insurance)
• Flexible spending account and health savings account
• Paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave)
• 80 hours of Paid Sick and Safe Time
• 25 days of vacation time
• 5 personal days
• 10 annual paid U.S. observed holidays
• 401k with a best-in-class company match
• Deferred compensation for eligible roles
• Fitness reimbursement or on-site fitness facilities
• Eligibility for tuition reimbursement

About the Company

• 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.
• Mastercard is a global technology company in the payments industry.
• Our mission is to connect and power an inclusive digital economy that benefits everyone, everywhere by making transactions safe, simple, smart, and accessible.
• Using secure data, networks, partnerships, and passion, our innovations help individuals, financial institutions, governments, and businesses realize their greatest potential.
• Our Decency Quotient (DQ) drives our culture and everything we do.
• Operating in more than 210 countries and territories, we are building a sustainable world that unlocks priceless possibilities for all.
• The ADUEX Engineering organization is central to Mastercard's growth strategy, delivering scalable, secure, and innovative solutions that empower small and medium businesses globally.

Equal Opportunity

• Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law.
• We hire the most qualified candidate for the role.
• In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact reasonable_accommodation@mastercard.com and identify the type of accommodation or assistance you are requesting.
• Do not include any medical or health information in this email.
• The Reasonable Accommodations team will respond to your email promptly.