Lead Performance Engineer – Onsite API & CI/CD Testing

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

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.