Front end Engineer [Brazil]
Confirmed on the employer's own hiring board on Nov 3, 2026. First seen by Alion on Feb 6, 2025. Arena scores B on the Alion truth index.
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, with +50M users engaging and having conversations on Arena every month.
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, and high performance.
Arena is expanding its AI product portfolio with MyAvatar.AI, a multimodal platform that enables users to create intelligent, personalized AI avatars through voice, video, and conversational interfaces.
Sometimes you're stuck in a job that doesn't make sense, working with outdated code and a stack that holds you back. If you love a good challenge, enjoy solving meaningful problems, and want to be part of a fast-growing AI startup in Silicon Valley - then Arena is the company you're looking for.
About the Role:
We’re looking for a Frontend Engineer to build fast, scalable, and high-performance web experiences across Arena’s products.
You’ll work closely with Product, Design, and Engineering to build AI-powered features, improve existing applications, and solve complex frontend and performance challenges. You’ll work alongside experienced engineers and have a direct impact on products used by millions of users.
What you will be doing:
- Build and maintain high-performance frontend applications using React, Next.js, and TypeScript.
- Develop real-time experiences and interfaces using WebSockets and GraphQL.
- Build reusable, scalable, and maintainable UI components and frontend architecture.
- Integrate frontend applications with APIs, AI services, and backend systems.
- Optimize application performance, scalability, and reliability across high-traffic environments.
- Collaborate with Product and Design to turn product requirements and UI/UX concepts into polished experiences.
- Debug complex frontend and production issues and implement robust solutions.
- Contribute to AI-powered features, including conversational experiences and AI Agents.
Must-Have Experience:
- 3+ years of professional frontend engineering experience.
- Strong experience with TypeScript and React.
- Production experience with Next.js.
- Experience working with GraphQL and REST APIs.
- Experience building real-time applications using WebSockets.
- Experience with Git and collaborative software development workflows
- Experience working in monorepo environments.
- Strong problem-solving skills and attention to performance, scalability, and code quality.
- Fluent English
Our Stack:
- Frontend: React.js, Next.js, TypeScript.
- UI: Web Components, CSS, Styled Components.
- APIs & Real-Time: GraphQL, REST, WebSockets.
- Build & Architecture: Monorepo, Turborepo, Webpack.
- Infrastructure & CI/CD: GitHub Actions, Firebase, Firestore.
- Design: Figma.
Nice-to-Have Experience:
- Styled Components or other CSS-in-JS solutions.
- Turborepo, Webpack, or similar frontend tooling.
- GitHub Actions and CI/CD workflows.
- Node.js and backend development.
- Firebase and Firestore.
- Experience building browser extensions or WordPress plugins.
- Experience with AI-powered products, conversational interfaces, or AI Agents.
Example Projects You’ll Be Working on:
- Implement applications using Next.js framework
- Build a real-time chat that can scale to 1M simultaneous users
- Develop plugins for WordPress and Google Chrome
- Implement high-performance widgets
- Build a JavaScript SDK
- Build and design AI features and AI agents
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.