go engineer for card-issuing platforms

COLIBRIX ONE builds AI-powered payment technologies for Payment Service Providers, Electronic Money Institutions, and neobanks across the EU and the UK. It provides global card processing, digital wallet infrastructure, cross-border merchant accounts, alternative payment methods, and corporate accounts. COLIBRIX ONE is a licensed Electronic Money Institution and Financial Institution, and a principal member of VISA and Mastercard.

• Design and develop Go-based services for a card-issuing platform, covering card lifecycle, wallets and balances, fees and commissions, authorization, and clearing flows, with a focus on stability, fault tolerance, and accurate financial operations
• Translate business requirements into technical specifications and propose solutions at the service and module levels, including API design, data models, and integrations with external providers
• Build solutions that comply with security requirements, including PCI DSS, sensitive data handling, and secure inter-service communication
• Analyze and optimize service performance, including code profiling, concurrency, data storage, and network interactions
• Participate in microservices architecture decisions covering service boundaries, communication patterns, load balancing, error handling, queues and streaming, and data storage
• Produce maintainable, testable code with appropriate unit and integration test coverage, following team development standards
• Review code, evaluate implementations, identify issues, and provide constructive feedback aligned with technical requirements
• Contribute practical solutions to technical discussions within the current architecture and development processes

• 3–5 Years of Go development experience focused on backend systems
• Around 3 years of experience working with fintech applications
• Understanding of distributed systems, microservices architecture, and API design, including REST/RPC transports
• Experience with SQL and NoSQL databases, message brokers such as Kafka and NATS, and caching systems
• Familiarity with CI/CD practices and tools, preferably GitLab
• Experience with AWS
• Ability to contribute expertise and collaborate with the team on technical solutions
• Strong communication skills and ability to explain complex technical ideas to colleagues with varying technical backgrounds
• Fluent written and spoken English and Russian
• Security-by-design mindset
• Understanding of fintech regulatory requirements, such as PCI DSS and GDPR
• Experience in performance optimization and building high-availability systems
• Experience with observability tools for logging, metrics, and tracing, such as Prometheus, Grafana, and OpenTelemetry

• Competitive salary and benefits package
• Flexible work arrangements to support work-life balance
• Employment will be under the appropriate legal entity based on the role and location