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Mastercard

Site Reliability Engineer I

O Fallon, MO, United States

Pay Ranges O'Fallon, Missouri: $61,000 - $102,000 USD

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Job details

Pay: Pay Ranges O'Fallon, Missouri: $61,000 - $102,000 USD
Posting language: English
Posted: Nov 5, 2026

Original job description

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

Site Reliability Engineer I

Overview

The Service Operations Technology (SOT) BizOps team is seeking a Site Reliability Engineer I to support and continuously improve enterprise infrastructure, configuration management, discovery, asset and inventory, automation, and operational technology platforms. This role provides an opportunity to develop expertise at the intersection of software engineering and production operations, with exposure to reliability, observability, automation, operational readiness, incident management, and continuous improvement. The successful candidate will support production services while developing engineering skills that help reduce operational toil, improve service visibility, automate repetitive activities, and improve platform reliability. Working with software engineering, infrastructure, product, cybersecurity, and operations teams, this position provides broad exposure to the technologies and engineering practices used to operate business-critical enterprise services.

Role Business Operations supports operational excellence and production readiness for the platforms we support. The team partners with software engineering and technology teams throughout the service lifecycle to help maintain reliable, observable, secure, scalable, and operationally supportable services. As a Site Reliability Engineer I, you will develop practical experience operating enterprise technology platforms while applying SRE and DevOps principles to production support. You will perform platform maintenance, monitoring, troubleshooting, deployment support, and operational validation while contributing to automation and engineering improvements. As your technical knowledge develops, you will have opportunities to contribute to increasingly complex automation, observability, reliability, and platform-engineering activities with guidance from experienced engineers. The SRE framework identifies observability, programming and scripting, systems and network administration, cloud computing, reliability and scalability, DevOps practices, troubleshooting, capacity/performance, IT Service Management, and proactive monitoring as core skills within the discipline. At SP9, the framework classifies these skills at the Foundational level.

Responsibilities

Support the day-to-day operation and maintenance of enterprise technology platforms and supporting infrastructure.
Perform routine system and application maintenance using established procedures and engineering standards.
Support monitoring of service health, availability, performance, capacity, and operational events.
Troubleshoot and resolve basic-to-moderate issues across application, infrastructure, network, operating-system, and integration layers.
Escalate complex technical issues while assisting experienced engineers with investigation and resolution.
Support production incidents and participate in root cause analysis and corrective-action activities.
Perform routine Linux/Unix system administration and support related enterprise infrastructure.
Participate in operating system and application upgrades, patching, vulnerability remediation, releases, deployments, and production changes.
Support production-readiness reviews and operational-validation activities for new or changed services.
Identify opportunities for automation and contribute to scripts and tools that reduce repetitive operational activities and toil, with guidance from experienced engineers.
Contribute to monitoring, alerting, health-check automation, dashboards, and observability improvements using enterprise technologies such as Splunk and Dynatrace. SOT activities document both technologies in operational monitoring work.
Work with REST APIs and system integrations in support of automated operational workflows.
Develop practical experience with source control, CI/CD, release pipelines, deployment automation, and configuration-management technologies.
Assist with capacity, performance, reliability, and system-health analysis.
Follow incident, problem, change, configuration-management, security, and operational risk-management practices.
Maintain technical documentation, operating procedures, troubleshooting guides, and knowledge articles.
Participate in technical reviews and quality checks that support service stability and operational readiness.
Collaborate with product, software engineering, infrastructure, cybersecurity, and operations teams.
Participate in knowledge-sharing activities and continuously develop technical expertise in SRE, automation, observability, cloud, and platform engineering.

Position Qualifications Required Qualifications

Bachelor's degree in Computer Science, Engineering, Mathematics, Information Technology, or a related discipline, or equivalent practical experience.
Foundational knowledge of Linux/Unix systems and system-administration concepts.
Foundational programming or scripting experience using Python, PowerShell, Bash, Java, Go, or similar technologies.
Understanding of networking fundamentals including TCP/IP, DNS, HTTP/HTTPS, SSH, and basic network troubleshooting.
Understanding of software engineering and automation concepts.
Familiarity with monitoring, logging, alerting, and observability concepts.
Systematic problem-solving and troubleshooting abilities.
Understanding of production support, incident response, and change-management practices.
Ability to document technical procedures, issues, and resolutions effectively.
Strong written and verbal communication skills.
Ability to collaborate effectively across technical and business teams.
Strong sense of ownership, curiosity, and interest in automation and continuous learning.

Preferred Qualifications

Experience supporting enterprise applications or infrastructure in production environments.
Experience with Python, PowerShell, Bash, or similar programming, scripting, and automation technologies.
Experience developing or supporting REST APIs, system integrations, and automated operational workflows.
Experience with Splunk, Dynatrace, or comparable enterprise monitoring and observability technologies.
Familiarity with source-control and repository technologies such as Bitbucket and Git, including branch and pull-request workflows.
Familiarity with CI/CD, release, and deployment technologies such as Jenkins and XLR.
Familiarity with configuration management and infrastructure automation technologies such as Chef and Ansible.
Exposure to workflow or orchestration technologies such as Apache NiFi or comparable platforms. NiFi has been discussed within SOT in connection with orchestrating URL/API monitoring and sending resulting logs to Splunk.
Familiarity with AWS, Azure, or enterprise cloud environments.
Experience with CMDB, discovery, asset management, inventory management, or configuration-management technologies.
Familiarity with BMC Discovery or comparable infrastructure-discovery technologies.
Experience with Remedy or comparable ITSM technologies.
Understanding of SSL/TLS and certificate management.
Familiarity with Agile, DevOps, SRE, and modern software-delivery practices.
Relevant Linux, cloud, security, automation, DevOps, or SRE certifications.

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.

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.

THIS POSTING RELECTS ONE OR MORE CURRENT VACANCIES ON OUR TEAM, AND MASTERCARD INTENDS TO FILL THIS POSITION BY 02/03/2027. If the fill date has passed, Mastercard intends to fill this position as soon as possible.

Pay Ranges O'Fallon, Missouri: $61,000 - $102,000 USD

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More about this job

Skills

DevOps
Troubleshooting
Network administration
IT service management
Troubleshoot
Root cause analysis
Linux
UNIX
System administration
Splunk
Dynatrace
Monitor operations in the leather industry
API development
CI/CD
Risk management
Documentation
Statistical quality control
Cybersecurity
Computer science
Computer technology
Python
Microsoft PowerShell
Bash
Oracle Java
Go
DNS
Problem solving
Incident response
Change management
Communication skills
Automation technology
Atlassian Bitbucket
Git
Jenkins
Ansible
Workflow
AWS
Microsoft Azure
Inventory management
Agile

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