Senior Performance Engineering Leader

SATHIYANARAYANAN SUNDERRAMAN

Senior Performance Engineer

United States *******.**@*****.*** +1-682-***-**** LinkedIn

EXECUTIVE SUMMARY

Senior Performance Engineering professional with 19+ years of experience delivering performance validation and optimization for large-scale, distributed, cloud-based, and data-intensive enterprise systems across banking, insurance, airlines, legal services, ERP, and enterprise platforms.

Hands-on expert across the performance engineering lifecycle, including NFR analysis, workload modeling, capacity planning, distributed load execution, monitoring, root cause analysis, and release readiness, with strong expertise diagnosing issues across application, API, JVM/CLR, database, and infrastructure layers.

Primary expertise in LoadRunner and Apache JMeter, executing load, stress, spike, endurance, and scalability tests at thousands to tens of thousands of concurrent users. Strong background in API, backend, and data performance testing, including Snowflake, validating query performance, concurrency behavior, warehouse sizing, and ETL/ELT workloads.

Strong software development foundation with hands-on experience in .NET (C#, VB.NET), Python, and SQL, enabling effective performance diagnostics, scripting, and automation. Experienced hybrid professional collaborating with engineering and architecture teams to integrate performance testing into CI/CD pipelines and support confident release decisions.

CORE PERFORMANCE ENGINEERING EXPERTISE

Performance engineering strategy, NFR definition, workload modeling, and release readiness

Distributed load, stress, spike, endurance, and scalability testing

API, backend, and integration performance validation

Data & analytics performance testing (Snowflake, ETL/ELT workloads)

Performance monitoring, diagnostics, and root cause analysis

Performance optimization across application, database, and infrastructure layers

CI/CD integration and continuous performance testing

TECHNOLOGY LANDSCAPE

Primary Performance Tools: LoadRunner, Apache JMeter

Monitoring & Observability: AppDynamics, Dynatrace, Splunk, DataDog, PerfMon, SiteScope, JConsole, NMON, YourKit, WinDbg, DebugDiag

API & Integration: REST, SOAP, Postman, SoapUI / ReadyAPI

Data & Backend: Snowflake, Oracle, SQL Server, PostgreSQL, MySQL, Aurora

Test Data Management: GenRocket, Delphix

Cloud & DevOps: AWS, GitLab, Docker, Kubernetes

Development & Scripting: C#, VB.NET, Python, Java, JavaScript, SQL

Platforms: Linux, Unix, Windows IIS, Apache, WebLogic

PROFESSIONAL EXPERIENCE

USAA – Banking & Insurance Platforms

Mar 2018 to Till Date - HCL Tech – San Antonio

Senior Performance Engineer / Performance Engineering Manager

Owned performance engineering for mission-critical banking and insurance systems across application, API, backend, and data layers

Defined NFRs, workload models, test strategies, and performance sign-off criteria

Executed large-scale distributed tests using LoadRunner and JMeter

Validated systems at thousands to tens of thousands of concurrent users

Performed Snowflake data performance testing using python Snowpark to validate the data and monitor performance of the data between data layers.

Performed root cause analysis using APM tools, logs, and metrics

Partnered with development, architecture, SRE, and data engineering teams

Integrated performance testing into CI/CD pipelines

Southwest Airlines – Reservation & Operations Systems

May 2017 – Feb 2018 - HCL Tech

Senior Performance Engineer / Test Lead – Noida & Dallas

Led performance testing for high-traffic airline reservation and operational systems

Designed workload models representing peak travel demand

Executed distributed LoadRunner tests under sustained and peak load

Identified scalability constraints prior to major releases

Coordinated execution and stakeholder reporting across teams

Clifford Chance – Enterprise Legal Platforms

Nov 2013 – Apr 2017 - HCL Tech - Chennai

Senior Performance Engineer / Test Lead

Owned performance testing for enterprise legal and SharePoint-based platforms

Defined NFRs and performance strategies aligned with global usage

Executed LoadRunner and JMeter tests for load and endurance scenarios

Built custom VSTS/TFS C# plug-ins to enhance performance testing

Performed backend SQL Server performance tuning

Pearson – E-Learning & Digital Education Platforms (Pegasus)

Nov – 2006 Oct -2013 Excel soft Technologies -Mysore

Lead Performance Engineer / Module Lead / Software Developer

Led performance engineering for a global e-learning platform

Validated scalability supporting 10,000+ concurrent users per cluster

Performed extensive SQL Server tuning and backend optimization

Contributed as a .NET developer (C#, VB.NET)

Built in-house performance automation framework (PALAT) designed and developed for automated build, deploy, pre-test, test execution and post-test activities.

EDUCATION & CERTIFICATIONS

M.Sc. – Information Technology, Alagappa University

Passed AWS Solution Architect associate in 2022

Project Management Professional (PMP)

Microsoft Certified Application Developer (MCAD) – .NET & C#

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