About us:
Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients. Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability.
The Role
We are looking for a Senior Quality Assurance Engineer for a project-based assignment to own quality across a React Native mobile application and a Next.js web experience, backed by Java/Spring Boot services behind a Node BFF. We are looking for a senior QA engineer who investigates rather than just reports. The work is hands-on: real devices, developer tools, logs, APIs, and automation, not only clicking through the UI. You will work closely with engineering, product,



and design throughout feature development and release cycles. The single most important non-technical trait we are hiring for is clear communication.
Key Responsibilities
Testing & Investigation
Execute manual and exploratory test passes against web and mobile releases, working from acceptance criteria, designs, and your own curiosity about where things break.
Use browser developer tools (console, network, elements, application storage, device emulation) as a first-line diagnostic tool, not just to confirm a bug but to narrow down where it lives.
Debug our React Native application on real iOS and Android devices as well as simulators and emulators: reading native device and crash logs, using React Native's debugging tooling (Metro, the JS console, React DevTools), inspecting network traffic, working with pre-release and over-the-air builds, and reproducing issues across OS versions and device classes.
Use

📌 Senior Quality Assurance Engineer | Contract | Remote, MX (México)
🏢 Tech Holding
📍 México