Remote · Full Time · Individual Contributor · +5 Years of Experience
Senior Backend Developer
Who We Are
Yuno is the AI-native operating system of integral commerce, powering the financial infrastructure of enterprise merchants, banks, and wallets. Through a single API, Yuno connects them to pay-ins, payouts, fraud prevention, KYC/KYB, and stablecoins globally, so they can operate everywhere. Agnostic by design and connected to 1,000+ payment methods and 460+ integrations in 190+ countries, Yuno optimizes acceptance rates, reduces costs, and strengthens security through specialized AI agents that learn from every transaction. Global brands including McDonald's, NetEase Games, GoFundMe, and Rappi run their payments on Yuno.
About The Role
Yuno is looking for a Backend Developer to join the Checkout Team — one of our most critical squads, responsible for the core transaction processing engine behind our checkout flows at scale. You'll design and build the systems that handle millions of payment transactions globally, alongside a world-class engineering team in a fast-paced,
high-impact environment.
Our core backend stack is Kotlin and Go — experience with either is a strong plus, though we care most about solid engineering fundamentals and depth in payments.
How AI Shows Up in This Role
The checkout engine you build is where Yuno's smart routing and fraud-prevention agents act — your services carry the transactions those AI agents learn from and optimize on every payment
AI is our default execution layer: you're encouraged to use AI-assisted tooling across design, implementation, testing, and reviews, and to bring it to our technical exercises. We care how you use it, not whether you do
Your Contribution Will Be
High-performance backend services — design, build, and evolve backend services and APIs in Kotlin and Go, engineered for reliability, low latency, and massive scale
Checkout payment flows — develop and maintain authorization, capture, refunds, reversals
📌 Senior Backend Developer (España)
🏢 Yuno
📍 España