Inperson Interview _Lead Performance Engineer _Sunnyvale, CA

Themesoft Inc; Sunnyvale (CA); Hybrid; USD 120,000 - 190,000; Full time

Job summary

Themesoft Inc invites an experienced Lead Performance Engineer to design, implement, and oversee performance testing across enterprise and cloud apps. You will lead scripting in JMeter, LoadRunner, K6, Gatling, and modern APM tools while coordinating with Dev, QA, and DevOps to ensure scalable, reliable software.

You will develop automated test suites for Next.js front-ends, perform API and backend testing, and contribute to CI/CD integration.

Qualifications

• 12+ years of experience in Performance Engineering and testing strategy.
• Hands-on with Apache JMeter, LoadRunner, K6, Gatling, DataDog, and Dynatrace.
• Design and execute performance tests for API, Web, and backend systems.

Responsibilities

• Triages network and AWS infra performance as part of test cycles.
• Design, develop, and maintain performance test scripts for web, API, and microservices.
• Conduct load, stress, endurance, and scalability testing.
• Develop automated test suites for Next.js applications including unit, integration, and E2E tests.
• Perform API performance testing (REST/JSON, SOAP) and integrate with automation frameworks.
• Analyze results to identify bottlenecks and optimize system performance.
• Monitor CPU, memory, GC, I/O, and network during tests.
• Collaborate with DevOps to optimize apps and infra; integrate tests into CI/CD.
• Prepare detailed performance reports and present findings to stakeholders.
• Continuously improve testing frameworks, tools, and practices.

Skills

Performance testing

JMeter

LoadRunner

K6

Gatling

DataDog

Dynatrace

API testing

Web testing

Automation testing

CI/CD

Jenkins

Git

Next.js testing

REST testing

SOAP testing

HTTP/HTTPS

JSON/XML

JVM monitoring

APM

Tools

JMeter

LoadRunner

K6

Gatling

DataDog

Dynatrace

Next.js

AWS

Jenkins

Git

REST APIs

SOAP APIs

Job description

Job Id: OOJ - 27434

Posted Date: 10/09/2026

Experience: -

Job Type: Contractual

Job Details

• Job Title: Lead Performance Engineer
• Location: Sunnyvale, CA
• 6-12+ months
• Contract
• Hybrid role (Submit local candidates, F2F interview mode)

Role Description

• 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
• Triaging Exp on network and AWS infra systems is required
• 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 :