At COLIBRIX ONE*, we're building advanced, AI-powered payment technologies that support Payment Service Providers (PSPs), Electronic Money Institutions (EMIs), and neobanks across the EU and the UK. As a fully licensed Electronic Money Institution (FCA Reference No. 927920) and holder of a Financial Institution Licence issued by the MFSA, as well as a principal member of both VISA and Mastercard, we provide comprehensive, real-world financial solutions that include:
• Integral card processing
• Digital wallet infrastructure
• Cross-border merchant accounts
• Alternative payment methods (APMs)
• Corporate accounts for legal entities

We're a fast-growing team with a passion for innovation, security, and scalability. Our culture values curiosity, collaboration, and impact - and we're looking for talented professionals who are ready to shape the future of fintech.
At COLIBRIX ONE, your work directly powers the digital economy. If you're eager to solve meaningful challenges and build with purpose, we'd love to hear from you.
Tech stack:
Go, MongoDB, Redis, NATS, JetStream, REST/gRPC,



AWS, Kubernetes, GitLab CI/CD, ArgoCD, Prometheus, Grafana.
Key responsibilities:
• Design and develop Go-based services for the Colibrix Partners card-issuing platform — card lifecycle (issuance, top-ups, blocks, replacement, expiry), wallets and balances, fees and commissions, authorisation and clearing flows — with a focus on stability, fault tolerance, and correct handling of financial operations
• Translate business requirements into clear technical specifications and propose concrete solutions at the service and module level, including API design, data models, and integrations with external providers
• Build solutions in compliance with security requirements, including PCI DSS, proper handling of sensitive data, and secure inter-service communication
• Analyze and optimize service performance, including code profiling, concurrency handling, and efficiency of data storage and network int

📌 Senior Go Engineer (Barcelona)
🏢 Colibrix One
📍 Barcelona