Product Engineer

At River AI, our mission is to create personal AI owned and shaped by each individual. To achieve this, we are rewriting the entire stack from scratch: personal hardware for local inference, bespoke training infrastructure, next-generation UIs, and frontier deep learning research.

Who we are

We are scientists, engineers, and builders from the industry's top tech companies and AI labs. We bring a proven track record of scaling consumer systems for hundreds of millions of users and architecting the pre-training infrastructure behind today's frontier models.

About the Role

We are seeking exceptional product engineers who can move seamlessly across the stack: backend systems, web and mobile surfaces, LLM-powered workflows, infrastructure, reliability, and product iteration.

You will work close to the model, close to the user, and close to production, taking end-to-end ownership to turn new AI capabilities into software people use every day.

What You’ll Do

• Design, build, and launch polished, responsive user-facing product experiences across modern web and mobile stacks, partnering closely with design.
• Architect high-performance backend services in Rust and Python, managing APIs, data systems, job queues, event pipelines, and distributed systems at scale.
• Integrate large language models into real user workflows, managing tool use, memory, retrieval, structured outputs, latency optimization, and cost control.
• Own the core infrastructure needed to run a high-scale consumer AI product, including deployment, monitoring, CI/CD, cloud infrastructure, and incident response.
• Partner with research and infrastructure teams to take ambiguous ideas from prototype to production, translating new model capabilities into understandable and trustworthy product experiences.

Skills & Qualifications

Minimum Qualifications:

• Bachelor’s degree in Computer Science, a related technical field, or equivalent practical industry experience.
• A proven track record of building and launching meaningful production software, ideally in consumer products, large-scale systems, or high-growth startups.
• Deep backend expertise with practical experience in Rust, Python, databases, APIs, distributed systems, and production architecture.
• Strong frontend or mobile capability with modern technologies such as TypeScript, React, React Native, Swift, or Flutter.
• Exceptional product judgment with the ability to reason backward from user needs, alongside a high degree of ownership to navigate ambiguity.