# QA Engineer - Company: [Arenaim]() - Location: Brazil Remote - Remote: Yes - Team: Engineering - Posted: February 26, 2026 ## Job description ## **About Arena:** 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. 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). 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. ## **About the Role:** We’re looking for a **QA Engineer** 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. This is a great opportunity to grow in a company that values mentorship, ownership, and continuous learning. ## **What you will be doing:** * Collaborate with product and engineering to understand requirements and define test strategies. * Write and maintain \*\*manual and automated test cases\*\* for web applications and APIs. * Run exploratory and regression tests for new features and releases. * Help monitor issues in production and identify patterns for improvement. * Contribute to maintaining and expanding our automated test suite using Cypress and Jest. ## **The challenges:** * Real-time messaging to support 100,000 concurrent users per customer application; * High performance: our API responses are in the 10ms range; * High scalability: we use sharding, master-master, and master-slave to ensure scalability; * High availability: our code is running on homepages of the most visited websites and apps in the internet; * Distributed databases for our Data Platform storing every user engagement. ## **You Might Be a Fit If You Have:** * Some experience (6–18 months) in QA or testing software * Familiarity with tools like **Cypress**, **Jest**, or **Selenium**. * Basic knowledge of **JavaScript or TypeScript.** * Understanding of REST APIs and how to test them. * Enthusiasm to learn, ask questions, and work in a collaborative environment. * Advanced English (spoken and written). ## **Nice-to-Have Experience:** * Experience with HTML/CSS and browser dev tools. * Exposure to mobile testing (iOS or Android). * Understanding of how CI/CD and deployment pipelines work. * Curiosity about how distributed systems scale. ## **Example Projects You’ll Be Working on:** * Build automated test suites and test cases for web apps, mobile apps, and APIs; * Build early warning systems that detect production environment errors; * Certify production releases; * Manual testing, where necessary – we prefer automated tests! * Continuously improve and maintain quality standards; * Analyze error patterns to identify repeating types of issues; * Monitor error and debug sources for production issues. ## ## **We also have some sweet perks like:** 🔥 Be a part of the team in Silicon Valley and join a global team 💪 A team of exceptional engineers leading the cutting-edge AI Agents. 💶 Competitive salary package & benefits ⛱️ 4 weeks of paid time-off 📖 Learning and Development budget 🚀 Key moment to join Arena in terms of growth and opportunities 💻 Ability to put your stamp on real-world AI applications that serve millions of users. 📚 Fast-learning environment, entrepreneurial and strong team spirit 🌍 Multiple nationalities: cosmopolite & multi-cultural mindset 💆‍♀️ Our people matter, work-life balance is important at Arena ## Apply [Apply on Arenaim]() Canonical job page: