Senior Go Engineer - Fintech Backend, Flexible Hours

Colibrix One; Warszawa; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Flexible work arrangements

Professional growth opportunities

Competitive salary

Collaborative team environment

Job summary

COLIBRIX ONE is pursuing Go-based backend development for its AI-powered payment platform serving PSPs, EMIs, and neobanks across the EU and UK. The role focuses on scalable, secure services, API design, and data models for card issuance, wallets, and settlements.

Join a fintech-focused team that values curiosity, collaboration, and impact, with hybrid work options and opportunities for professional growth in a fast-growing company.

Qualifications

• 3–5 years of Go backend development experience, focused on backend systems.
• Fintech experience.
• Understanding of distributed systems and microservices architecture.
• API design experience (REST/RPC).
• Experience with SQL/NoSQL databases, message brokers (Kafka, NATS).
• Familiarity with CI/CD (GitLab) and AWS.

Responsibilities

• Design and develop Go-based services for the card-issuing platform, wallets, balances, and related flows.
• Translate business requirements into technical specifications and API/data model designs.
• Ensure security by design, PCI DSS compliance, and secure inter-service communication.
• Analyze and optimize service performance and data storage/ network interactions.
• Participate in microservice architecture decisions, service boundaries, and data storage approaches.
• Produce maintainable, testable code with unit/integration tests and code reviews.

Skills

Go development

Backend systems

Distributed systems

API design

Fintech domain

Communication

Security by design

English & Russian

Tools

SQL

NoSQL

Kafka

NATS

Prometheus

Grafana

OpenTelemetry

GitLab CI/CD

AWS

Job description

COLIBRIX ONE is pursuing Go-based backend development for its AI-powered payment platform serving PSPs, EMIs, and neobanks across the EU and UK. The role focuses on scalable, secure services, API design, and data models for card issuance, wallets, and settlements.

Join a fintech-focused team that values curiosity, collaboration, and impact, with hybrid work options and opportunities for professional growth in a fast-growing company.