QA Engineer

<h2><strong>About Arena:</strong></h2> <p>Arena is a startup created in Silicon Valley with a mission to build communities for creators, publishers and brands with the power of AI. Companies using Arena include Disney, Reuters, Fox, Red Bull and NFL. We have +2,000 customers in 150 countries and with +50M users having conversations on Arena per month and engaging with our AI tools.</p> <p>We are a Series A company backed by top-tier investors such as CRV, Redpoint and Craft Ventures. Arena offers a unique work environment and the chance to collaborate with diverse teammates across multiple countries, with a culture of ownership (autonomy, growth, and specially high performance).</p> <p>Sometimes you're stuck in a job that doesn't make sense. Managing tasks and infinite backlogs, not talking to customers and miles away from making product decisions. If you love a good challenge, you're a curious product guy who experiments with AI and AI agents every day, and you want to be a part of one of the fastest-growing AI startups in Silicon Valley — then Arena is the company you're looking for.</p> <p> </p> <h2><strong>About the Role:</strong></h2> <p>We’re looking for a <strong>QA Engineer</strong> who’s passionate about technology, curious about how things work, and eager to ensure quality across our products. You’ll join a supportive, fast-paced environment and collaborate with experienced engineers to test web applications, APIs, and new features as they’re developed.</p> <p>This is a great opportunity to grow in a company that values mentorship, ownership, and continuous learning.</p> <h2><strong><br>What you will be doing:</strong></h2> <ul> <li>Collaborate with product and engineering to understand requirements and define test strategies.</li> <li>Write and maintain **manual and automated test cases** for web applications and APIs.</li> <li>Run exploratory and regression tests for new features and releases.</li> <li>Help monitor issues in production and identify patterns for improvement.</li> <li>Contribute to maintaining and expanding our automated test suite using Cypress and Jest.</li> </ul> <p style="line-height: 1.5;"> </p> <h2><strong>The challenges:</strong></h2> <ul> <li style="font-weight: 400; line-height: 1.5;"><span style="font-weight: 400;">Real-time messaging to support 100,000 concurrent users per customer application;</span></li> <li style="font-weight: 400; line-height: 1.5;"><span style="font-weight: 400;">High performance: our API responses are in the 10ms range;</span></li> <li style="font-weight: 400; line-height: 1.5;"><span style="font-weight: 400;">High scalability: we use sharding, master-master, and master-slave to ensure scalability;</span></li> <li style="font-weight: 400; line-height: 1.5;"><span style="font-weight: 400;">High availability: our code is running on homepages of the most visited websites and apps in the internet;</span></li> <li style="font-weight: 400; line-height: 1.5;"><span style="font-weight: 400;">Distributed databases for our Data Platform storing every user engagement.</span></li> </ul> <p> </p> <h2><strong>You Might Be a Fit If You Have:</strong></h2> <ul> <li>Some experience (6–18 months) in QA or testing software</li> <li>Familiarity with tools like <strong>Cypress</strong>, <strong>Jest</strong>, or <strong>Selenium</strong>.</li> <li>Basic knowledge of <strong>JavaScript or TypeScript.</strong></li> <li>Understanding of REST APIs and h