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COLIBRIX ONE

Golang Engineer - Global Card Processing Solutions

COLIBRIX ONE
Portugal · Full-time · Mid-Senior
Join COLIBRIX ONE - Innovating the Future of Payments

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:

  • Global card processing
  • Digital wallet infrastructure
  • Cross-border merchant accounts
  • Alternative payment methods (APMs)
  • 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 Project:

Fintech Product for media buyers and affiliate companies, that provides infrastructure for managing cards, wallets (accounts), and crypto-fiat operations for businesses operating at scale. Works at the intersection of payments, risk management, and automation, processing high volumes of transactions across multiple service providers and jurisdictions.

Tech Stack:

Go/ Microservices architecture/ REST and RPC APIs/ SQL and NoSQL databases/ event-driven processing with Kafka and NATS/ CI/CD with GitLab/ containerization using Docker and Kubernetes

Key responsibilities:

  • Design and develop Go-based services for the crypto-fiat operations and corresponding systems, focusing on stability, fault tolerance, and correct handling of financial operations
  • Translate business requirements into clear technical specifications and propose concrete solutions at the service and module level, including API design, data models, and integrations with external providers
  • Build solutions in compliance with security requirements, proper handling of sensitive data, and secure inter-service communication
  • Analyze and optimize service performance, including code profiling, concurrency handling, and efficiency of data storage and network interactions
  • Participate in the architecture of microservices: service boundaries, communication patterns, load balancing, error handling, queues/streaming, and data storage approaches
  • Produce maintainable, testable code with appropriate unit and integration test coverage, following team development standards
  • Participate in code review as part of the development process: evaluate implementations, identify issues, and provide constructive feedback aligned with technical requirements
  • Contribute to technical discussions by offering concrete, practical solutions within the current architecture and development processes

Requirements:

  • 3+ years of Go development experience
  • Understanding how to develop and implement scalable and reliable software solutions
  • Knowledge of CI/CD practices and tools, ideally GitLab
  • Experience working with SQL and NoSQL databases, message brokers (Kafka, NATS)
  • Understanding of distributed systems, microservices architecture, and API design, REST/RPC transports
  • Experience with Docker and Kubernetes
  • Experience with software engineering best practices: unit testing, code reviews, design documentation
  • Fluency in both written and spoken English and Russian

Nice to Have:

  • Experience in fintech, banking or financial institutions
  • Understanding of regulatory requirements in the fintech space (e.g., PCI DSS, GDPR, auditability,...)

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

Salary Range:

60 000 - 90 000 EUR gross annually

  • Employment will be offered through one of the group's legal entities - Mellifera Kartiera Ltd, Colibrix Ltd, or Mellifera Operations Ltd - depending on the role, location, and applicable legal framework

Please note that COLIBRIX ONE is a brand representing a group of legal entities. The employment contract will be signed with the relevant company within the group (Mellifera Kartiera Ltd, Colibrix Ltd, or Mellifera Operations Ltd) depending on the nature of the position and jurisdiction

This position is offered within the COLIBRIX ONE. Employment will be under the appropriate legal entity based on the role and location.

Key Skills

Ranked by relevance

microservices storage docker nosql kafka cicd sql containerization fault tolerance kubernetes pci dss gitlab gdpr dss ai
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Country Guide

Portugal

Startup-friendly with strong expat appeal

Posted
Jan 16, 2026
Type
Full-time
Level
Mid-Senior
Location
Lisbon
Company
COLIBRIX ONE

Industries

IT Services IT Consulting

Categories

Other

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