Senior Go Engineer — Fintech Payments, Flexible Work

Colibrix One; Kraków; On-site; PLN 240,000 - 320,000; Full time

Benefits offered by this job

Competitive salary

Flexible work arrangements

Learning opportunities

Job summary

COLIBRIX ONE is seeking an experienced Go Engineer to join our team and contribute significantly to our payment gateway product. The ideal candidate will bring deep technical expertise, a collaborative mindset, and the ability to mentor teammates through knowledge and experience rather than formal authority.

You will work on distributed, transaction-critical fintech systems with a strong focus on reliability, security, and scalable microservices, shaping the future of digital payments.

Qualifications

• 5+ years of professional Go development experience, including fintech/payments or transaction-critical systems.
• Strong knowledge of distributed systems, microservices, and API design (REST and gRPC).
• Advanced PostgreSQL skills, including transactions, isolation levels, 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 like 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, AML/KYC, or anti-fraud platforms.
• Understanding of security requirements for financial data and translating business requirements into technical solutions.

Skills

Go development

Fintech/payments experience

Distributed systems

API design REST/gRPC

PostgreSQL advanced

Event-driven architecture

AWS, Kubernetes, CI/CD

Security of financial data

Russian & English proficiency

Tools

NATS

Kafka

RabbitMQ

PostgreSQL tooling

Job description

COLIBRIX ONE is seeking an experienced Go Engineer to join our team and contribute significantly to our payment gateway product. The ideal candidate will bring deep technical expertise, a collaborative mindset, and the ability to mentor teammates through knowledge and experience rather than formal authority.

You will work on distributed, transaction-critical fintech systems with a strong focus on reliability, security, and scalable microservices, shaping the future of digital payments.