AI Product Focused - Senior Full-stack - Rails Engineer (Europe)

Yuma AI is seeking a Senior Full-stack Rails Engineer to join their dynamic team of 7 engineers. The company is at the forefront of AI-powered customer support automation in e-commerce, successfully serving over 100 paying customers with their advanced orchestration platform. Their solution enables top merchants to automate over 80% of support tickets.

The role demands a seasoned professional who can thrive in a fast-paced startup environment. The technical stack includes a Ruby on Rails API backend supported by PostgreSQL, Redis, and Sidekiq, while the frontend utilizes Next.js and React. The platform handles impressive scale, processing millions of support tickets monthly and e-commerce data points daily.

This position is ideal for someone who goes beyond the traditional 9-to-5 mindset and is passionate about delivering excellence. The ideal candidate should have extensive experience with Rails applications and be comfortable with both backend and frontend development. Recent experience with LLMs is mandatory, as working with AI and managing non-deterministic output is central to the role.

The company values skills, ownership, and drive over formal education. They're looking for someone who can make pragmatic decisions that balance rapid iteration with high product quality. As part of a small, intense team, you'll be involved in various aspects of development, from product iterations and A/B testing to LLM research and AI agent pipeline development.

Founded by Guillaume Luccisano, a 3rd time YC founder, Yuma AI has built a strong team of 20 dedicated professionals focused on delivering exceptional value through AI innovation. This role offers an opportunity to make a significant impact in a rapidly growing AI-powered customer support solution.