Front end Engineer [Brazil]

Build fast, scalable web experiences and AI-powered features across Arena's community platform products.
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Sometimes you're stuck in a job that doesn't make sense, working with outdated code and a stack that holds you back.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.
Tags: 💬 Inglês, ✈️ Vaga internacional, 🌍 100% Remoto