We're looking for a Senior Backend Engineer to join our backend team at Zerion. This team builds and evolves the backend systems at the core of our products and customer-facing solutions. We value strong ownership, thoughtful system design, and a high bar for code quality. Design, build, and maintain scalable distributed backend systems powering platform and product capabilities.
Own backend services end-to-end : from architecture and implementation to monitoring and long-term reliability.
Build and evolve Web3 platform backend components , including protocol integrations, support for newly emerging blockchain networks, and reliable interactions with smart contracts.
Ensure high standards of code quality , performance, security, and observability.
Use AI as a core part of your engineering workflow — designing, reviewing, debugging and shipping with it. 5+ years of experience designing and building distributed backend systems .
~ Strong knowledge of algorithms, data structures, and software design patterns .
~ You should be able to talk concretely about where it has changed how you build,



and where you've learned not to trust it.
~ High standards for code quality, system reliability, and user experience — you care about getting it right, not just getting it done.
~ Excellent knowledge of Golang is a plus, not a blocker.
Docker & Kubernetes.
Experience with databases :
SQL: Postgres
NoSQL: MongoDB, Cassandra
Experience with monitoring and observability tools : Sentry, Prometheus, Grafana.
Hands-on experience with AWS (Amazon Web Services) .
Experience with Python 3 .
Blockchain systems, dApps, Smart contracts.
Company Overview
Trusted by 50+ top crypto brands as paying clients
Salary & Benefits: Receive a competitive salary, medical insurance, coworking membership, and additional benefits.
Unlimited Days Off and Adaptable Work Schedule : Recharge and explore life outside the office with our flexible time-off policy and work schedule.
Remote Work Essentials : We provide

📌 Engineer - back End Developer (España)
🏢 Zerion
📍 España