Inperson Interview: Lead Performance Engineer_Sunnyvale, CA

Themesoft Inc; Sunnyvale (CA); On-site; USD 150,000 - 210,000; Full time

Job summary

Themesoft Inc is seeking a Lead Performance Engineer to design, implement, and execute performance testing strategies for enterprise and cloud applications in Sunnyvale, CA. This onsite role emphasizes API, web, and backend performance with hands-on JMeter and related tools.

The ideal candidate will drive performance testing across Dev, QA and DevOps, optimize applications and infrastructure, and integrate tests into CI/CD pipelines. Strong collaboration and communication are essential.

Qualifications

• Experience in performance testing at enterprise scale.
• Strong scripting and test automation skills.
• Hands-on with JMeter and API performance testing.
• Familiarity with CI/CD integration of performance tests.

Responsibilities

• Design, develop, and maintain performance test scripts for web, API, and backend systems.
• Conduct load, stress, endurance, and scalability tests.
• Develop automated test suites for Next.js applications (unit, integration, E2E).
• Analyze results, identify bottlenecks, and provide recommendations.
• Collaborate with DevOps to optimize performance and CI/CD integration.

Skills

Performance testing

JMeter

API testing

CI/CD

Next.js

APM

Automation testing

REST/SOAP

HTTP/HTTPS

Tools

Apache JMeter

LoadRunner

K6

Gatling

Data Dog

Dynatrace

Job description

Inperson Interview: Lead Performance Engineer_Sunnyvale, CA

Job Id : OOJ - 27198

Posted Date : 09/21/2026

Experience : -

Job Type : Contractual

Overview :

Title: Lead Performance Engineer
Location: Sunnyvale, CA (Onsite)
Work Arrangement: Onsite
Employment Type: Contract
Duration: 6-12+ Months
Primary Skills: Performance Engineering, CI/CD, Jmeter

Role Descriptions:

• We are looking for a skilled Lead Performance Engineer to design, develop, and execute performance testing strategies for enterprise and cloud-based applications.
• The ideal candidate has hands-on experience with JMeter, Load runner, K6, Gatling, Data Dog, Dynatrace skills, and solid expertise in API, Web and automation testing.
• Candidate will work closely with development, QA, DevOps, and architecture teams to ensure applications are scalable, reliable, and performant.

Key Responsibilities

• 12+ Yrs of experience in Performance Engineering.
• Design, develop, and maintain performance test scripts using Apache JMeter or similar tools for web, API, and backend systems.
• Conduct load, stress, endurance, and scalability testing for applications and microservices.
• Design, develop, and maintain automated test suites for Next.js applications, covering unit, integration, and E2E tests.
• Perform API performance testing (REST/JSON, SOAP) and integrate with automation frameworks.
• Analyze test results, identify performance bottlenecks, and provide actionable recommendations.
• Monitor system performance metrics (CPU, memory, GC, I/O, network) during test execution.
• Collaborate with development and DevOps teams to optimize application and infrastructure performance.
• Integrate performance tests into CI/CD pipelines.
• Prepare detailed performance test reports and present findings to stakeholders.
• Continuously improve testing frameworks, tools, and best practices.

Required Skills & Qualifications

• Strong experience in performance testing and engineering best practices
• Hands-on expertise with Apache JMeter (test plans, scripting, listeners, distributed testing)
• Front end performance testing experience on Next.js application
• Design and deployment of performance test framework
• Experience with API automation and performance testing (REST, SOAP)
• Knowledge of HTTP/HTTPS protocols, JSON, XML
• Experience with performance monitoring tools (APM, server logs, JVM monitoring)
• Familiarity with CI/CD tools (Jenkins, Git, etc.
• Strong analytical, troubleshooting, and communication skills"

Work Authorization

• Applicants must be legally authorized to work in the United States.

Equal Employment Opportunity

Themesoft Inc is an Equal Employment Opportunity employer. We consider qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other status protected by applicable federal, state, or local law.

Skills :

API,QA,DEVOPS,SOAP,JMETER,PERFORMANCE TESTING,NEXT.JS,APACHE JMETER,GIT,PERFORMANCE ENGINEERING,TROUBLESHOOTING,JSON,HTTP,CI/CD