Hire the Best Performance Testing Specialists
in the United States

Clients rate our Performance Testing specialists
Rating is 4.9 out of 5.
4.9/5
Based on 423 client reviews
Gulraiz A.

Irving, Texas

$15/hr
4.2
166 jobs

✔️ Automation Testing ✔️ Playwright ✔️ AI-Assisted testing ✔️ Functional QA ✔️ Website testing ✔️ Manual QA ✔️ Bug report✔️ Usability testing & App reviews✔️ iOS and Android app testing ✔️ Regression Testing✔️ Selenium WebDriver ✔️ Cypress ✔️ End-to-end testing ✔️ UI & UX testing ✔️ ChatGPT ✔️ Gemini ✔️ Copilot ✔️ Claud Are you looking to launch a flawless web or mobile app, scale your release velocity, or get deep, critical insights into why your users might be dropping off? As a Senior QA Automation & Manual Testing Engineer with over 11 years of experience across US-based enterprise platforms and high-growth startups, I don't just find bug. I protect your product’s reputation and user experience. I bridge the gap between heavy-duty engineering (building scalable automation pipelines) and high-empathy user advocacy (usability reviews, deep exploratory sessions, and UX feedback). 🚀 High-Demand QA Services I Offer: 1. Premium US-Based Web & Mobile App Reviews & Feedback Real-Device USA Reviews: Testing on actual, physical iOS and Android devices to replicate authentic US user environments, carrier networks, and localized workflows. UX & Usability Audits: Deep-dive reviews looking at user friction points, layout inconsistencies, navigation logic, and accessibility (WCAG). You receive a structured video walk-through or a comprehensive report. Exploratory & Ad-Hoc Testing: Going off-script to mimic unpredictable real-world user behavior, finding edge-case crashes before your customers do. 2. Enterprise-Grade Test Automation Frameworks: Web Automation: Architecting lightning-fast, zero-flakiness End-to-End (E2E) automation frameworks from scratch using Playwright (TypeScript/JavaScript), Cypress, and Selenium (Java).Mobile Automation: Native and cross-platform app test frameworks using Appium.CI/CD Integration: Sharding and parallelizing tests inside GitHub Actions or Jenkins so your dev team gets quality feedback in under 5 minutes on every commit. 3. Functional, Manual, & API Testing Comprehensive test plan/test case design in Jira, TestRail, or Azure DevOps. Robust REST API testing and automation utilizing Postman. Regression and Smoke testing cycles to protect critical business logic during fast-paced sprints. 🛠️ Core Technical & QA Stack: Languages: TypeScript, JavaScript, Java, Python, SQLAutomation: Playwright, Selenium WebDriver, Cypress, AppiumMobile Testing: Physical iOS (iPhones) & Android devices, BrowserStack, Firebase Test LabAPI & Backend: Postman, REST Assured Management & CI/CD: Jira, TestRail, GitHub Actions, Jenkins, Docker 💼 What You Get in Every Deliverable: Clear, Reproducible Bug Reports: Ticket-ready bug descriptions with steps to reproduce, clear environmental context, and attached screen recordings/logs. Actionable UX Feedback: Strategic product reviews detailing why a feature feels clunky and how to optimize it for higher conversion rates. Clean, Maintainable Code: Automation repositories built using the Page Object Model (POM), fully commented and ready for your developers to maintain. Whether you need a quick, meticulous usability review before a major app store launch, or a strategic partner to build an automation testing pipeline from scratch let's chat. Click the "Invite" button on the top right, and let’s discuss how we can secure your app's quality.

  • Software Testing
  • Usability Testing
  • End-to-End Testing
  • Bug Tracking & Reports
  • Mobile App Testing
  • Manual Testing
  • Web Testing
  • Functional Testing
  • Regression Testing
  • QA Testing
  • Product Testing
  • Cypress
  • Selenium WebDriver
  • Automated Testing
  • AI Model Training Prompt
Oleksii D.

Ponte Vedra Beach, Florida

$30/hr
5.0
14 jobs

⭐ Top-Rated Manual QA Engineer | Web & Mobile Testing | API | 6+ Years Experience I help startups find critical bugs before release and improve product quality so users don’t run into issues. With 6+ years of QA experience, I test web and mobile applications end-to-end — from onboarding flows to payments, integrations, and APIs. I focus not only on bugs, but also on UX issues, edge cases, and real user risks. 🔧 What I do • Manual testing (Web, iOS, Android) • Functional, regression & exploratory testing • API testing (Postman, Swagger) • UI validation (Figma) • Clear bug reports with steps, screenshots & videos 📱 Real devices iPhone 16 Pro Max, iPhone 13 Pro, iPhone XR / X Samsung A52, Samsung Tablet, MacBook Pro → Real-device testing to catch issues others miss. 🏆 Results • Found critical issues before production releases • Improved stability for startup products • Tested 50+ mobile builds • End-to-end testing for SaaS platforms 💬 Why clients choose me ✔ Fast and detail-oriented ✔ Clear, developer-friendly reports ✔ Focus on real user experience ✔ Reliable and easy to work with

  • Software QA
  • Manual Testing
  • Web Testing
  • Mobile QA
  • Functional Testing
  • Regression Testing
  • Smoke Testing
  • UX & UI
  • Quality Assurance
  • TestRail
  • Bug Tracking & Reports
  • Documentation Testing
  • Postman
  • Python
Sophiko G.

Feasterville-Trevose, Pennsylvania

$30/hr
5.0
17 jobs

I’m a Manual QA Tester with over 4 years of experience working on Web, Mobile, and API projects across SaaS, AI, and Fintech platforms. I focus on practical, hands-on testing, covering regression, UX feedback, bug reporting, and performance testing with JMeter. My goal is to help teams release software that’s reliable, user-friendly. I have tested CRM systems, E-commerce platforms, financial applications, and AI-powered tools, collaborating closely with developers, product managers, and designers. I enjoy working with teams to catch issues early, improve release quality, and enhance the overall user experience. 𝐊𝐞𝐲 𝐒𝐤𝐢𝐥𝐥𝐬 & 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬: • Manual testing for Web, Mobile, and cross-platform applications • Regression, exploratory, and edge-case testing • API testing and verification • Performance testing and load validation using JMeter • Cross-browser and cross-device testing on Chrome, Safari, Firefox, iOS, and Android • Clear and actionable bug reports with steps, screenshots, and videos • UX feedback to improve usability and reduce friction 𝐓𝐨𝐨𝐥𝐬 𝐚𝐧𝐝 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐈 𝐔𝐬𝐞: • Test Management & Bug Tracking: Jira, ClickUp, Trello, TestRail, Qase • API & Performance Testing: Postman, Swagger, JMeter • Cross-browser & Device Testing: BrowserStack, Chrome DevTools, Android Studio, Figma • Automation & Frameworks: Java, Selenium, Selenide, Allure, BDD • Data & Documentation: Excel, Google Sheets • Communication & Collaboration: Slack, Microsoft Teams, Zoom , Google Meet • Screen Recording & Testing Support: ScreenRec, Requestly , Jam • Version Control: Git, GitHub My goal is to deliver clear, actionable testing results that improve reliability, usability, and product quality, helping teams launch with confidence. 📩 If you are looking for a QA professional who can improve product quality, uncover issues early, and provide practical UX and performance insights, I’m ready to support your project.

  • Software Testing
  • Manual Testing
  • Functional Testing
  • Regression Testing
  • API Testing
  • Web Testing
  • Mobile App Testing
  • Bug Tracking & Reports
  • Test Case Design
  • Test Execution
  • Usability Testing
  • Jira
  • Postman
  • Swagger
  • SQL
Abdul S.

Carrollton, Texas

$20/hr
4.9
40 jobs

Let's Build a Brand That Stands Out! Your brand loses clients in the first 3 seconds. I make sure it doesn't. I'm Abdul Shaikh, a Senior Graphic Designer and UI/UX Specialist with years of experience helping 2,500+ clients and 80+ companies across the US, UK, UAE, Canada, and Australia build powerful visual identities and digital experiences that attract, convert, and retain customers. From brand identity systems and logo design to UI/UX design for e-commerce websites and SaaS applications, every project I deliver is built with purpose, precision, and measurable impact. What I design for you: ✔ Brand Identity Design & Logo Design ✔ UI/UX Design for E-Commerce Websites & SaaS Applications ✔ Social Media Graphics & Ad Creatives ✔ Amazon Product Listing Images & A+ Content ✔ Packaging Design & Label Design ✔ Book & eBook Cover Design (Amazon KDP & IngramSpark) ✔ Presentation & Pitch Deck Design (PowerPoint & Google Slides) ✔ Brochure, Flyer & Booklet Design ✔ Infographic Design & Data Visualization ✔ YouTube Thumbnail Design (CTR-Optimized) ✔ T-Shirt & Print-on-Demand Design (Merch by Amazon, Printful) ✔ Motion Graphics & Logo Animation ✔ Restaurant Menu Design ✔ Banner & Billboard Design ✔ Vehicle Wrap Design ✔ Stationery Design & Business Card Design ✔ Poster Design & Illustration Design ✔ Icon Design & App UI Graphics ✔ Label & Tags Design Tools I work with: Adobe Illustrator · Adobe Photoshop · Adobe InDesign · Figma · Adobe XD · Adobe After Effects My portfolio covers 22+ design categories, including UI/UX for SaaS platforms and e-commerce, Amazon product listing images, brand identity systems, logo animation, packaging, and print design, built for clients across 10+ industries. 📈 What working with me looks like: ✔ Clear brief → fast turnaround → clean delivery ✔ Print-ready and developer-ready file formats every time ✔ Revisions until you are 100% satisfied ✔ Fast response, usually within a few hours ✔ 24/7 availability across all time zones I don't design to fill a canvas. I design to solve your business problem visually, whether that's a brand identity that builds instant trust, a SaaS UI that reduces churn, an Amazon listing that increases conversion, or a thumbnail that doubles your click-through rate. If you need a designer who delivers quality, communicates clearly, and understands what your brand actually needs. I'm ready. 📩 Message me and let's build something that works.

  • Adobe Photoshop
  • Adobe Illustrator
  • Figma
  • Graphic Design
  • Logo Design
  • Brand Identity
  • UX & UI Design
  • Brand Identity Design
  • Social Media Design
  • Packaging Design
  • Book Cover Design
  • Adobe InDesign
  • Infographic
  • Motion Graphics
  • T-Shirt Design
  • YouTube Thumbnail
  • Adobe After Effects
  • Presentation Design
  • Amazon Listing
  • App Icon Design
Mechar Reziah N.

Corning, California

$25/hr
5.0
5 jobs

As a Computer Science graduate with hands-on experience in quality assurance, I help businesses deliver bug-free, high-performing websites and mobile applications through thorough and structured testing. I have successfully completed multiple QA projects on Upwork with a perfect 5.0 rating, covering website testing, mobile app QA, user insights testing, and application functionality testing. What I offer: ✅ Manual Testing (Functional, UI/UX, Regression) ✅ Website Testing & Bug Reporting ✅ Mobile App Testing (iOS & Android) ✅ User Acceptance Testing (UAT) ✅ Test Case Writing & Documentation ✅ Cross-browser & Cross-device Testing ✅ Detailed Bug Reports with Screenshots/Videos Tools I Work With: 🔧 Jira | Trello | Google Sheets | Loom 🔧 Chrome DevTools | Browser Stack 🔧 TestRail | Notion I take pride in delivering clear, detailed reports that help development teams fix issues quickly and efficiently. My Computer Science background gives me a strong understanding of how applications work, making me more effective at identifying and communicating bugs. Currently expanding into Automation Testing (Selenium, Cypress, Postman) to offer even more value to my clients. Let's work together to make sure your product works perfectly before it reaches your users!

  • Software Testing
  • Manual Testing
  • Quality Assurance
  • Bug Tracking & Reports
  • Test Case Design
  • Functional Testing
  • Regression Testing
  • User Acceptance Testing
  • GUI Testing
  • Cross-Browser Testing
  • Mobile App Testing
  • iOS
  • Website
  • Android
  • Web Application
  • Bug Reports
  • Test Development
  • Jira
  • Chrome OS
  • Agile Software Development
Craig C.

Sayner, Wisconsin

$60/hr
5.0
113 jobs

My focus is on growing your eCommerce business via optimization of the Shopify platform. I prioritize clear and thorough communication, full commitment to your project, and a dedicated work ethic to achieve desired results. Services I can provide for you include: ✅ Shopify store design & set-up ✅ Migration from other eCommerce platforms to Shopify ✅ Shopify theme code customizations to meet any need or desire ✅ Set-up, integration, and customization of Shopify apps ✅ Site performance testing and speed optimization ✅ SEO audits and optimization ✅ Initial training and ongoing support Why me? ✅ I work exclusively with Shopify and thus have made it my domain of expertise ✅ I have a proven step-by-step process to get from initial consultation to store launch in your required timeframe. ✅ I will give you regular updates to keep you on track for timely completion ✅ My service includes full training and ongoing support once your project is complete Next step: Message me to inquire about a free consultation and see how we can partner to fulfill your goals. I look forward to hearing from you!

  • Shopify
  • Shopify Plus
  • Shopify Development
  • Shopify Theme
  • Conversion Rate Optimization
  • Shopify SEO
  • Shopify Apps
  • Ecommerce Website
  • Web Development
  • Ecommerce
  • Ecommerce Website Development
  • Liquid
  • Shopify Templates
  • Set Up Shopify Site
  • HTML5
  • CSS
  • JavaScript

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