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Freelance Testing Developer - David Schoutens
Freelance Testing Developer5.0 (84 reviews)
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Full-stack software craftsman and technical leader with over 15 years of experience. Equally adept at system design, programming, technical leadership, mentorship, and business collaboration. Have a wide breadth of technical experience, but specialize in backend API development, relational databases, and web applications. Passionate about simplicity and efficiency. I have worked at over a dozen companies large and small, in a handful of different domains. Also participated in hundreds of interviews, about half-and-half as the interviewer and the interviewee. I have given dozens of talks and training sessions on a variety of topics, mostly focusing on distributed systems, caching, and testing. My top skills are Java, SQL, testing, and refactoring. I have experience with formal academic and professional mentorship, and would love to help you skill up, solve a problem, or just nerd out with you today!

Freelance Testing Developer - Pavneet Singh
Freelance Testing Developer5.0 (2162 reviews)
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I am an adept **Full Stack Software Engineer and Architect** and with a wealth of experience in frontend, backend, and Data Structures and Algorithms (DSA) solution development. My expertise spans **clean architecture, TDD(test driven development), code reviews, debugging, and profiling**, enabling the delivery of high-quality solutions within constrained short timeframes. I have worked and collaborated with numerous prominent global blue chip corporations, startups, and international clients. Additionally, have made substantial contributions to Pluralsight and Stack Overflow, boasting a reputation exceeding 37k+ and ranking within the top 0.30% of users on the latter platform. Motto: Full refund in case of no help. Discounts: - Student discount is applied automatically. • Senior software engineer, have worked as a Subject Matter Expert and lead with the primary role to develop features, solve complex bugs, architecture refinements, feature integration, and development. • I intent to deliver a top-quality experience by delivering the most optimal solutions and guidance to enlighten the learners. • I have helped many developers to fix critical bugs and implement complex features on the Codementor platform. • Teaching is one of passing and I have helped numerous mentees on their journey to become successful developers in various fields such as web, native mobile, and big data. • I have expertise in curating and simplifying the content to deliver the best experience with different analogies. • I am deft at feature implementation, debugging, and refactoring. If you have any questions, Feel free to reach out, looking forward to meeting you.

Freelance Testing Developer - Philip Warkentien II
Freelance Testing Developer5.0 (1 reviews)

### About me I’m a **Staff-level Frontend and UI Engineer** with **13+ years of combined professional and teaching experience**, specializing in **UI engineering**: Design Systems, enterprise CSS, responsive layouts, accessibility (WCAG), data visualization, and web animations — with deep expertise in **React, JavaScript/TypeScript, HTML, and CSS**. Throughout my career, I’ve consistently operated as **the bridge between Design and Engineering**, translating ambitious visual and UX goals into **scalable, performant, and accessible frontend systems**. My work focuses on aligning design intent with real-world engineering constraints while maintaining long-term maintainability and code quality. I’ve led and contributed to **Design System initiatives**, built **data-visualization–heavy charts, tables, and UIs**, improved **localization workflows**, and helped raise **UI standards across critical user flows** in large, high-impact products. A recurring part of my work involves **untangling legacy stylesheets** and transforming them into **clean, enterprise-grade CSS and component architectures**. In addition to hands-on engineering, I bring **5.5 years of experience as a Udacity mentor**, where I guided developers through frontend, UI, and JavaScript projects, reviewed real-world codebases, and helped engineers progress from fundamentals to **production-ready practices**. I mentor because I enjoy helping developers move beyond surface-level fixes and truly understand **why UI breaks** — whether it’s layout mechanics, rendering behavior, accessibility pitfalls, or component design.

Freelance Testing Developer - Rengaraj
Freelance Testing Developer5.0 (2 reviews)

I have experience in Python for more than 10+ years. I have been using Python in Embedded systems. I have experience in Making Test setup for various Embedded device for automation testing.

Freelance Testing Developer - Ramiz Raja
Freelance Testing Developer5.0 (1 reviews)

About Ramiz is a senior mobile engineer with 12+ years of professional experience building high-quality mobile applications across Android, iOS, React Native, and Flutter. He has deep expertise in native Android development using Kotlin and Java and is a Google Certified Associate Android Developer. He has contributed to large-scale production apps, including the Plume B2B Android application, where multiple product flavors are actively used by 10+ businesses, and Unified Remote, an Android app with 1.5+ million installs worldwide. Beyond Android, Ramiz has strong hands-on experience in native iOS development using Swift, having shipped multiple production apps end-to-end — from Figma-based UI implementation to App Store deployment and post-release maintenance. He has extensive experience integrating Firebase services such as Authentication, Firestore, Remote Config, Cloud Messaging, Crashlytics, and ML features into live applications. He also brings solid cross-platform experience with React Native and Flutter, having delivered production-ready apps and SDKs, built scalable architectures, and collaborated closely with design and backend teams. His Flutter experience includes Riverpod, GetX, GoRouter, and Dio, while his React Native work spans both application development and SDK maintenance. Ramiz is known for writing clean, maintainable code, taking full ownership of delivery, and building stable, performance-focused apps that provide real value to users.

Freelance Testing Developer - Njoh Noh Prince Junior
Freelance Testing Developer

Hello! I'm an accomplished **Frontend Engineer** specializing in crafting intuitive, high-performance web applications. With over **5 years of experience**, I excel in **React**, **Next.js**, **TypeScript**, and **UI/UX design**, helping clients bring their visions to life efficiently and effectively.

Freelance Testing Developer - Osama Altaf
Freelance Testing Developer5.0 (3 reviews)

I am a highly motivated individual with an academic background in Computer Science and have 15+ years of extensive experience in Software Testing (Manual & Automation). I have gained an in-depth understanding of Software Testing and an ISTQB Certified Tester with Foundation Level and Agile Tester certifications. * Experienced in Web and Mobile Automation testing using Selenium Java, Katalon Studio, Selenium Ruby, WebDriverIO, Playwright with JS, Jmeter, Artillery, Appium. * Experienced in API, Mobile and Web Testing. * Experienced in Functional, Regression, System and Browser compatibility testing. * Consultant QA with 14+ years of experience in both Manual and Automated Software Testing.

Freelance Testing Developer - Greg Gorlen
Freelance Testing Developer5.0 (458 reviews)

I'm a full stack software engineer, technical writer and computer science educator. I enjoy testing, debugging, refactoring, application design, maintaining projects and teaching. My primary technologies are JavaScript, TypeScript, React, Express (PERN stack), Playwright, Puppeteer, Python, Flask and C. See my [Stack Overflow tags](https://stackoverflow.com/users/6243352/ggorlen?tab=tags) for more technologies ordered roughly by my interest and experience. In addition to Stack Overflow, I'm active on [Code Review Stack Exchange](https://codereview.stackexchange.com/users/171065/ggorlen). Feel free to peek at a few of these reviews to get a sense of the insights I can offer your code. I'm looking forward to hearing about your project! _<sub>Profile picture by the wonderful [Emily Huston](https://emilyhuston.github.io) ❤️</sub>_

Freelance Testing Developer - Emmanuel Inyang
Freelance Testing Developer5.0 (7 reviews)

I am a highly skilled software engineer with 5 years of experience, proficient in transforming wireframes into MVPs, architecting scalable microservices, and developing single-page applications. My technical expertise includes backend technologies like FastAPI and Flask, frontend proficiency in React and Vue, testing excellence, and database management. Key strengths include problem-solving, attention to detail, and thriving in collaborative environments. I excel in team management, fostering growth and productivity, and mentoring team members. Currently seeking a full-time role to leverage my skills and contribute to an innovative organization, with a focus on leadership growth and professional advancement.

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Frequently asked questions

How long do Testing projects normally take?

The length of a project depends on many factors, including the scope of your project and the technical complexity of it. When you post a freelance Testing project request on Codementor, you’ll have the option to indicate when you’d expect the project to be completed. We suggest chatting with the interested developers to ensure both sides are on the same page. For more information on how to post a freelance Testing request on Codementor, check out our article.

How much does it cost to hire a freelance Testing developer?

We don’t charge anything when you post a freelance hiring request for Testing developers! You’ll have the chance to determine what the budget for your project is when you post the request. You’ll only need to pay the developer if you’re 100% satisfied with their work. Please know that Codementor charges a small service fee when a developer completes the job.

What makes Codementor Testing developers different?

We do a comprehensive technical and communications screen of all Testing developers at Codementor. Our network includes book authors, popular open source contributors, top Stack Overflow users and engineers at top tech companies. In addition, to continually ensure the quality of our freelancers, we regularly check in on existing Testing developers’ user satisfaction rates.

What happens if I’m not happy with the freelancer’s work?

As a platform, we strive to ensure you’re always happy with your Testing project’s results. If you’re unsatisfied with the results, you can choose to get a refund for the project. Additionally, you can contact our support team should you need any further assistance with your project.

For more answers to frequently asked questions, see here.

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