Senior Go Engineer (Core Banking)

Stack

Responsibilities

• ▹Contribute to the payment gateway product in Go
• ▹Design reliable transactional systems
• ▹Translate business requirements into technical solutions and drive implementation independently
• ▹Mentor team members through knowledge and experience

Requirements

• ▹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: transactions, isolation levels, locking, indexing, migrations, 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
• ▹Strong communication skills and working proficiency in Russian and English

Nice to have

• ▹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
• ▹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

Soft skills

What we offer

• ▹Opportunity to shape fintech solutions within a growing company
• ▹Collaborative, horizontal team structure
• ▹Continuous learning and development opportunities
• ▹Competitive salary and benefits package
• ▹Flexible work arrangements for work-life balance

About the company

COLIBRIX ONE builds AI-powered payment technologies for PSPs, EMIs and neobanks across the EU and the UK. It is a fully licensed Electronic Money Institution (FCA), holds a Financial Institution Licence from the MFSA and is a principal member of VISA and Mastercard. Services include global card processing, digital wallet infrastructure, cross-border merchant accounts, alternative payment methods and corporate accounts.