AI Engineer

<h2><strong>About Arena:</strong></h2> <p>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).&nbsp;</p> <p></p> <p data-pm-slice="1 1 []">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, with +50M users having conversations on Arena every month and engaging with our AI Agents.</p> <p></p> <p data-pm-slice="1 1 []">Sometimes you're stuck in a job that doesn't make sense, building AI features that never make it into production. If you enjoy turning cutting-edge AI into real products, solving complex problems, and seeing your work used by millions of users — then Arena is the company you're looking for.</p> <h2><strong></strong></h2> <h2><strong>About the Role:</strong></h2> <p>We’re looking for an AI Engineer to build and scale AI-powered experiences across Arena and MyAvatar.AI.<strong><br></strong>You’ll work closely with Engineering, Product, and other AI-focused teams to design, implement, evaluate, and improve AI systems that power conversational, voice, and multimodal experiences.</p> <h2><strong></strong></h2> <h2><strong>What you will be doing:</strong></h2> <ul> <li>Build and integrate AI-powered features and services into production products.</li> <li>Develop LLM-powered applications using APIs, agents, RAG, tool calling, and structured outputs.</li> <li>Design and improve AI pipelines for conversational, voice, and multimodal experiences.</li> <li>Evaluate model quality, reliability, latency, and cost, and continuously improve AI performance.</li> <li>Build experiments and prototypes, then turn successful approaches into scalable production systems.</li> <li>Collaborate with Product and Engineering to translate business and user problems into practical AI solutions.&nbsp;</li> </ul> <h2>&nbsp;</h2> <h2><strong>Must-Have Experience:</strong></h2> <ul> <li>2+ years of experience in AI Engineering, Machine Learning Engineering, Software Engineering, or a similar technical role.</li> <li>Strong Python programming skills and experience building production software.</li> <li>Hands-on experience with LLMs, Generative AI, and AI APIs.</li> <li>Experience building applications with RAG, embeddings, vector databases, agents, or tool calling.</li> <li>Strong understanding of AI evaluation, prompt engineering, model behavior, and production trade-offs.</li> <li>Experience working with APIs, cloud infrastructure, and distributed systems.</li> <li>Strong problem-solving skills and ability to move quickly from prototype to production.</li> <li>Fluent English.</li> </ul> <h2><strong>Nice-to-Have Experience:</strong></h2> <ul> <li>Experience with LangChain and LangGraph for building LLM applications, agents, and AI workflows.</li> <li>Experience with Node.js and TypeScript or other backend languages.</li> <li>Experience with AWS, serverless architectures, and cloud-native applications.</li> <li>Experience with real-time systems, WebSockets, GraphQL, or APIs.</li> <li>Experience with MongoDB, PostgreSQL, Redis, or other distributed data systems.</li> </ul> <h2><strong>We also have some sweet perks like:</strong></h2> <p>🔥 Be a part of the team in Silicon Valley and join a global team</p> <p>💪 A team of exceptional engineers leading the cutting-edge AI Agents.</p> <p>💶 Competitive salary package &amp; benefits</p> <p>⛱️ 4 weeks of paid time-off</p> <p>📖 Learning and Development budget</p> <p>🚀 Key moment to join Arena in terms of growth and opportunities</p> <p>💻 Ability to put your stamp on real-world AI applications that serve millions of users.</p> <p>📚 Fast-learning environment, entrepreneurial and strong team spirit</p> <p>🌍 Multiple nationalities: cosmopolite &amp; multi-cultural mindset</p> <p>💆‍♀️ Our people matter, work-life balance is important at Arena</p> <p>&nbsp;</p>