AI Engineer

About the role

About Arena:

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, with +50M users having conversations on Arena every month and engaging with our AI Agents.

Arena is also 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, 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.

About the Role:

We’re looking for an AI Engineer to build and scale AI-powered experiences across Arena and MyAvatar.AI. 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.

What you will be doing:

- Build and integrate AI-powered features and services into production applications.

- Develop LLM-powered applications using APIs, agents, RAG, tool calling, and structured outputs.

- Design and improve AI pipelines for conversational, voice, and multimodal experiences.

- Evaluate model quality, reliability, latency, and cost, and continuously improve AI performance.

- Build experiments and prototypes, then turn successful approaches into scalable production systems.

- Collaborate with Product and Engineering to translate business and user problems into practical AI solutions.

Must-Have Experience:

- 2+ years of experience in AI Engineering, Machine Learning Engineering, Software Engineering, or a similar technical role.

- Strong Python programming skills and experience building production software.

- Hands-on experience with LLMs, Generative AI, and AI APIs.

- Experience building applications with RAG, embeddings, vector databases, agents, or tool calling.

- Strong understanding of AI evaluation, prompt engineering, model behavior, and production trade-offs.

- Experience working with APIs, cloud infrastructure, and distributed systems.

- Strong problem-solving skills and ability to move quickly from prototype to production.

- Fluent English.

Nice-to-Have Experience:

- Experience with LangChain and LangGraph for building LLM applications, agents, and AI workflows.