Senior Go Engineer (Core Banking)
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Before you apply
LocationKraków, Lesser Poland Voivodeship, Poland
Typefull-time
SenioritySenior
Experience5+ yrs
DepartmentIT
Company size51–200 people
PostedSep 11, 2026 · 1mo ago
Verified live1d ago
At a glanceSummarised by Seekless from the posting.
5+ years of professional Go development experience
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
Hands-on experience in banking domain: ledgers, accounting flows, accounts, and balance management
Hands-on experience in banking domain: holds, reversals, adjustments, reconciliation, and settlement
Hands-on experience in banking domain: SEPA, SWIFT, and ISO 20022
Hands-on experience in banking domain: 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
Skills
Go
PostgreSQL
REST
gRPC
NATS
Kafka
RabbitMQ
AWS
Kubernetes
CI/CD
Temporal
GitLab CI/CD
OpenTelemetry
Prometheus
Grafana
Loki
Tempo
Benefits
Competitive salary
Flexible work
Learning development
Collaborative culture
About the company
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:
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Global card processing
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Digital wallet infrastructure
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Cross-border merchant accounts
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Alternative payment methods (APMs)
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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.
About the role
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
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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:
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Opportunity to shape the future of fintech solutions within a growing company
•
Collaborative, horizontal team structure that values your expertise and ideas
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Continuous learning and development opportunities to enhance your skills and career growth
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Competitive salary and benefits package
•
Flexible work arrangements to support work-life balance
Legal
* This position is offered within the COLIBRIX ONE. Employment will be under the appropriate legal entity based on the role and location.