Senior Site Reliability Engineer

Calling all innovators - find your future at Fiserv.

We're Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world. We connect financial institutions, corporations, merchants, and consumers to one another millions of times a day - quickly, reliably, and securely. Any time you swipe your credit card, pay through a mobile app, or withdraw money from the bank, we're involved. If you want to make an impact on a global scale, come make a difference at Fiserv.

Job Title

Senior Site Reliability Engineer

About your role:

We are seeking a highly skilled and experienced Senior Performance & Site Reliability Engineer to join our team and take a leadership role in ensuring the performance, reliability, and scalability of our production systems. This role is ideal for a seasoned professional who thrives in dynamic environments, possesses deep technical expertise across multiple layers of the stack, and is passionate about delivering exceptional client experiences through robust and high-performing systems.

This hybrid position combines the disciplines of performance engineering and site reliability engineering, with a strong focus on production environments. The successful candidate will proactively identify and resolve performance bottlenecks, recommend and implement system optimizations, and lead incident response efforts with speed and precision. Additionally, this role will be instrumental in evaluating infrastructure readiness during client onboarding and forecasting capacity needs to support future growth.

What you'll do:

Production Performance Optimization

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  Conduct comprehensive performance assessments of production systems, identifying inefficiencies across application code, JVM configurations, database queries, and infrastructure components

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  SQL query optimization and strategic indexing to enhance database responsiveness; JVM memory tuning to reduce garbage collection overhead & improve application stability and application-level enhancements to support scalability & reduce latency

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  Collaborate with development, QA, and infrastructure teams to ensure performance improvements are effectively integrated into deployment pipelines and release cycles

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Monitoring, Observability & Diagnostics

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  Utilize a robust suite of observability and diagnostic tools to monitor system health, detect anomalies, and perform deep root cause analysis: Splunk, Dynatrace, Extrahop, Foglight, and Wireshark

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  Develop and maintain advanced dashboards, alerts, and automated reporting mechanisms to ensure proactive detection and resolution of performance issues.

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Client Onboarding & Infrastructure Planning

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  Participate in client onboarding processes by reviewing anticipated usage patterns and evaluating the impact on existing infrastructure; perform capacity planning and forecasting to ensure infrastructure readiness and scalability in alignment with client growth and business objectives

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  Collaborate with infrastructure and operations teams to provision new hardware, optimize resource allocation, and maintain high availability and performance standards

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Incident Response & Reliability Engineering

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• Act as a senior technical lead during production incidents, driving rapid triage, root cause identification, and resolution efforts; lead post-incident analysis to identify systemic issues and implement long-term solutions that enhance system resilience and prevent recurrence
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Experience you'll need to have:

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  7+ years of hands-on experience in performance engineering, site reliability engineering, or a closely related technical discipline

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  Advanced proficiency in SQL and database performance tuning (e.g., Oracle, PostgreSQL, MySQL)

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  Deep understanding of JVM internals, memory management, and garbage collection strategies

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  Strong programming skills in Java and scripting languages such as Python or Bash

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  Familiarity with cloud platforms (AWS, Azure, GCP) and container orchestration technologies (e.g., Kubernetes, Docker)

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  Demonstrated experience with Splunk, Dynatrace, Extrahop, Foglight,and Wireshark in production environments

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  Exceptional analytical, problem-solving, communication and collaboration skills, with the ability to work effectively across cross-functional teams

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  Bachelor's degree in computer science, Engineering, or related field

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Experience that would be great to have:

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  Experience in infrastructure capacity planning and forecasting

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  Background in incident management, postmortem analysis, and continuous improvement initiatives

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  Relevant certifications in cloud technologies, performance engineering, or SRE practices (e.g., Google SRE, AWS Certified Solutions Architect)

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How you'll work:

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• Fiserv emphasizes in-person collaboration to help you grow your career while shaping the future of fintech; this role is on-site Monday through Friday
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Sponsorship:

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• In order to be considered, you must be legally authorized to work in the U.S. without need for visa sponsorship now or in the future
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This role is not eligible to be performed in Colorado, California, District of Columbia, Hawaii, Illinois, Maryland, Minnesota, New Jersey, New York, Nevada, Rhode Island or Washington.

It is unlawful to discriminate against a prospective employee due to the individual's status as a veteran.

Please note that salary ranges provided for this role on external job boards are salary estimates made by outside parties and may not be accurate.

Thank you for considering employment with Fiserv. Please:

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  Apply using your legal name

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  Complete the step-by-step profile and attach your resume (either is acceptable, both are preferable).

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Our commitment to Equal Opportunity:

Fiserv is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, gender, gender identity, sexual orientation, age, disability, protected veteran status, or any other category protected by law.

If you have a disability and require a reasonable accommodation in completing a job application or otherwise participating in the overall hiring process, please contact . Please note our AskHR representatives do not have visibility to your application status. Current associates who require a workplace accommodation should refer to Fiserv's Disability Accommodation Policy for additional information.

Note to agencies:

Fiserv does not accept resume submissions from agencies outside of existing agreements. Please do not send resumes to Fiserv associates. Fiserv is not responsible for any fees associated with unsolicited resume submissions.

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Please be aware of fraudulent job postings that are not affiliated with Fiserv. Fraudulent job postings may be used by cyber criminals to target your personally identifiable information and/or to steal money or financial information. Any communications from a Fiserv representative will come from a legitimate Fiserv email address.