Senior Site Reliability 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 Site Reliability Engineer

Biz Ops Engineer / Site Reliability Engineer (SRE)
Who Is Mastercard?
At Mastercard Technology, we work to connect and power an inclusive, digital economy that benefits everyone, everywhere—by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships, and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential.
Our Decency Quotient (DQ) drives our culture and everything we do inside and outside of our company. We cultivate an inclusive workplace that respects individual strengths, perspectives, and experiences. We believe our differences make us stronger—enabling better decisions, greater innovation, and stronger business results.
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Technology at Mastercard
What we create today will define tomorrow. We develop revolutionary technologies that reshape the digital economy to be more connected, inclusive, safe, fast, and sustainable.
Working at Mastercard means being part of a unique culture—collaborative, diverse, and globally connected. Our employees are empowered to shape careers across disciplines and continents while working alongside experts and leaders at every level of the business to improve what exists and invent what’s next.
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About the Role
The Business Operations (Biz Ops) Team is seeking a Business Operations Site Reliability Engineer (SRE). The Biz Ops organization serves as the production readiness steward for Mastercard products.
As a Biz Ops SRE, you are responsible for ensuring platform stability, reliability, and health. You will:
• Break down barriers to operational excellence by fostering developer run ownership
• Enable teams to build resilient, fault-tolerant, and scalable products
• Support developers during application build phases with a focus on:
o Operational design
o Automation
o Capacity planning
o Monitoring and observability
Biz Ops teams take a holistic view of systems and enforce operational standards while facilitating an agile, learning-focused culture.
We are seeking a Senior Site Reliability Engineer to play a critical role in ensuring the reliability, scalability, and performance of applications that power Mastercard’s global operations. As a thought leader, you will bring deep technical expertise, a strong automation mindset, and mentoring capabilities.
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What You’ll Do
• Support daily operations with a strong focus on:
o Incident triage
o Root cause analysis
o Business impact assessment
o Blameless post-mortems
• Engage early in the development lifecycle to:
o Proactively manage production readiness
o Optimize production changes
o Enhance customer experience
• Drive risk management, compliance, and resiliency across environments
• Align product and customer priorities with operational requirements through continuous feedback throughout the application lifecycle
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Program(s) You May Support : Cyber Security Services, Financial Crime Solutions, Fraud Reporting and Insight
CSS Biz Ops Team supports multiple products, applications and services under 3 programs managing and mitigating cyber fraud. We support our customers (Issuers, Acquirers, Merchants) in providing risk scoring, sharing detail regarding cards that may have been compromised/involved in suspicious activity and providing them with valuable analysis. We support applications that assist our customers with identifying gaps which can be exploited by criminals (identifying vulnerabilities – and providing remedial recommendations). We provide useful reports to show trend analysis. We also maintain Mastercard’s repository of Fraud transactions which serves as the source of truth for Fraud data within the enterprise.
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Team Responsibilities & Core Capabilities:
Operational Readiness Architecture
• Own overall application health, performance, and capacity
• Support services pre-launch through:
o Architecture reviews
o Capacity planning
o Launch readiness reviews
• Partner with product and development teams to establish:
o Monitoring and alerting strategies
o Zero-downtime deployment frameworks
Site Reliability Engineering
• Design and operate highly reliable and scalable systems
• Perform root cause analysis and collaborate with development teams on remediation
• Participate in on-call rotations and incident response
• Implement sustainable incident management and blameless post-mortems
• Define and improve Service Level Objectives (SLOs)
• Automate data-driven alerting to proactively identify issues
DevOps & Automation
• Improve the full service lifecycle—from design to production and optimization
• Support CI/CD pipelines with validation and operational gating
• Lead DevOps automation and best practices
• Reduce operational toil through increased automation and tooling
• Optimize capacity planning and performance
ITSM Practices
• Analyze ITSM activities and identify operational gaps
• Provide continuous feedback to development teams on resiliency improvements
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Qualifications
Required
• Bachelor’s degree in Computer Science or related technical field (or equivalent experience)
• Ability to read, write, and understand code in at least one programming language
• Strong understanding of DevOps principles and configuration management
• Experience designing and operating large-scale distributed systems
• Strong analytical and problem-solving skills
• Excellent communication skills and ownership mindset
• Passion for observability, automation, and continuous improvement
• Ability to collaborate across geographically distributed and matrixed teams
Technical Proficiency
• Programming experience in one or more of:
o Java, Spring Framework, Python, Go, C++, Spark, Big Data, gRPC
• Experience with CI/CD tools such as:
o Git / Bitbucket, Jenkins, Maven, Artifactory, Chef, Groovy
• Familiarity with cloud platforms (AWS, Azure, or GCP preferred)
• Experience with messaging technologies:
o Kafka, RabbitMQ, ActiveMQ, Event Brokers
• Observability tools:
o Splunk, Dynatrace, Prometheus, Datadog, Grafana
• Strong understanding of:
o Networking fundamentals (Layers 1–3)
o Load balancers and application firewalls
o Operating systems
o Logging and monitoring standards
o High availability and business continuity
o Caching and configuration management
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Nice to Have (Senior / L7+)
• Hands-on experience with Kubernetes, Docker, and container registries
• Public cloud architecture experience (AWS, Azure, GCP)
• Blue/green deployment strategies
• DevSecOps expertise and modern CI/CD practices
• Azure certifications (AZ-203, AZ-400) preferred
• Security fundamentals including:
o TLS/SSL
o Certificate lifecycle management
o Encryption methods (symmetric/asymmetric)

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 View email address on apply.j-vers.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.

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.

In line with Mastercard’s total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: 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 and 5 personal days, pro-rated based on date of hire; 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; and many more. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.

Pay Ranges

O'Fallon, Missouri: $96,000 - $163,000 USD