QA Engineer

Arena is 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 responsibility).

We are 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 Agent AI.

Sometimes you're stuck in a job that doesn't make sense. Refactoring code from ages ago, the stack is miles away from what it's supposed to be. If you love a good challenge, enjoy solving meaningful problems, and want to be a part of one of the fastest-growing AI startups in the Silicon Valley — then Arena is the company you're looking for.

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.

• 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.

• 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.

• 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).

• 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.

• 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.

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

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