AI Solution Engineer - Full-stack / Rails Engineer (Barcelona)

Yuma is building a complete orchestration platform that deploys autonomous AI agents dedicated to customer support in e-commerce. We are one of the leaders in this space and we offer one of the most advanced platforms to date, supporting over 150 paying customers. Our agents replicate human capabilities by taking actions and retrieving information from external services as needed.

Our top merchants automate over 80% of their support tickets through Yuma.

Yuma was founded byGuillaume Luccisano, a 3rd time YC founder, and now boasts a team of 20 highly dedicated talents. We are in our 10th consecutive month of double-digit growth and aim to multiply our revenue by 4 in 2026.

We remain a small team of 5 engineers, but we are intense and we move very quickly! Fast iteration is key. In the past 2 years since Yuma’s founding, we’ve built a lot, but there is still much more to do! We operate at startup speed and handle everything: product iterations, A/B testing, LLM research, AI Agents pipeline, new feature development, performance optimizations, and more. We are intensely focused on delivering value to our users and on product excellence. That is the only thing that matters.

Our backend is a standard Ruby on Rails API powered by PostgreSQL, Redis, and Sidekiq. Our frontend uses Next.js and React. We already handle a significant load, ingesting and processing millions of support tickets per month and millions of e-commerce data points per day.

We are definitely not a 9-to-5 team, and we are heavily committed to delivering excellence throughout our craft.

You have led and built multiple large Rails applications, and you always strive for excellence. You are pragmatic, making the right trade-offs that favor speed of iteration while maintaining high product quality. You are driven by delivering the best experience and value to your users. You might have a preference for working on backend projects, but you aren't afraid of frontend work. Rails has no secrets for you.

Recent experience playing with LLMs is now mandatory, and you have already adopted AI in your day-to-day tasks. Building with LLMs and managing non-deterministic output is not scary to you.

If you are relentless, deeply caring about delivering value & ownership, and looking to join an early, hard-working team, we want you 👈. We are seeking someone who is looking to embrace a new challenge and commit to it 100%.

Your diploma doesn't matter to us; we only care about your skills, your sense of ownership, and drive.

If you’re still junior, but the description above sounds like the person you aim to become in the next 3 years, don’t be shy: there’s always space for raw talent at Yuma.

Dont' be shy, apply! :)

Please, if you are considering applying, first read our culture page: https://www.notion.so/yuma-ai/Yuma-s-Culture-5b0e15f1334242ce8a62daab9f2038a1?pvs=4