Senior Go Engineer (Core Banking)

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:

The ideal candidate will bring deep technical expertise, a collaborative mindset, and the ability to influence and mentor team members through knowledge and experience rather than formal authority.

What You Need to Succeed

• 5+ years of professional Go development experience, including 3+ years in fintech, banking, payments, or other transaction-critical systems
• Strong knowledge of distributed systems, microservices, and API design (REST and gRPC)
• Advanced PostgreSQL skills, including transactions, isolation levels, locking, indexing, migrations, and concurrency
• Experience designing reliable transactional systems using idempotency, retries, event deduplication, transactional outbox, sagas, and reconciliation
• Hands-on experience with event-driven architectures and message brokers such as NATS, Kafka, or RabbitMQ
• Experience building and operating production services, including incident investigation, safe deployments, database migrations, and observability
• Practical knowledge of AWS, Kubernetes, and CI/CD
• Experience integrating with banks, payment providers, processors, AML/KYC, or anti-fraud platforms
• Understanding of security requirements for financial and personal data
• Ability to translate business requirements into technical solutions and independently drive implementation
• Strong communication skills and working proficiency in Russian and English

Banking Domain Experience

Hands-on experience in several of the following areas is highly valued:

• Ledgers, accounting flows, accounts, and balance management
• Holds, reversals, adjustments, reconciliation, and settlement
• SEPA, SWIFT, and ISO 20022
• Card transaction lifecycles and card scheme integrations

Nice to Have

• Experience with Temporal or a similar workflow engine
• Experience with NATS/JetStream, GitLab CI/CD, OpenTelemetry, Prometheus, Grafana, Loki, or Tempo
• Knowledge of event sourcing or append-only financial data models
• Familiarity with PCI DSS and GDPR
• Experience using AI coding tools for analysis, implementation, testing, or code review

What We Offer:

• Opportunity to shape the future of fintech solutions within a growing company
• Collaborative, horizontal team structure that values your expertise and ideas
• Continuous learning and development opportunities to enhance your skills and career growth
• Competitive salary and benefits package
• Flexible work arrangements to support work-life balance