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COLIBRIX ONE
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Golang Engineer - Payment Gateway Solutions
United Kingdom
· Full-time
·
Not Applicable
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
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.
We're 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 influence and mentor team members through knowledge and experience rather than formal authority.
About The Project
Payment gateway solutions - fintech product that securely connects merchants and financial institutions to process online payments in real time. It handles transaction routing, encryption and tokenization, fraud and risk checks, and integration with acquirers, payment aggregators and alternative payment methods. The Payment Gateway supports high availability, scalability, and compliance with PCI DSS and PSD2.
Tech Stack
Go, PostgreSQL/MySQL, MongoDB/Redis, Kafka, NATS, REST/gRPC, AWS, GitLab CI/CD, Prometheus, Grafana.
Key Responsibilities
60 000 - 90 000 EUR gross annually
This position is offered within the COLIBRIX ONE. Employment will be under the appropriate legal entity based on the role and location.
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
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.
We're 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 influence and mentor team members through knowledge and experience rather than formal authority.
About The Project
Payment gateway solutions - fintech product that securely connects merchants and financial institutions to process online payments in real time. It handles transaction routing, encryption and tokenization, fraud and risk checks, and integration with acquirers, payment aggregators and alternative payment methods. The Payment Gateway supports high availability, scalability, and compliance with PCI DSS and PSD2.
Tech Stack
Go, PostgreSQL/MySQL, MongoDB/Redis, Kafka, NATS, REST/gRPC, AWS, GitLab CI/CD, Prometheus, Grafana.
Key Responsibilities
- Design and develop Go-based services for the payment gateway and related fintech 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, including PCI DSS, 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.
- 3–5 years of Go development experience focused on backend systems, and around 5 years of experience working with fintech applications
- Understanding of distributed systems, microservices architecture, and API design, including REST/RPC transports
- Experience working with SQL and NoSQL databases, message brokers (Kafka, NATS), and caching systems
- Familiarity with CI/CD practices and tools, preferably GitLab
- Experience working with the AWS cloud platform
- Ability to contribute expertise and collaborate with the team on technical solutions
- Strong communication skills and the ability to explain complex technical ideas to colleagues with varying levels of technical background
- Fluency in written and spoken English and Russian
- Experience in the fintech domain
- Security-by-design mindset: ability to design solutions with security considerations built in at every stage
- Understanding of regulatory requirements in the fintech space (e.g., PCI DSS, GDPR)
- Experience in performance optimization and building high-availability systems
- Experience with observability tools: logging, metrics, tracing (Prometheus, Grafana, OpenTelemetry)
- Experience integrating with external payment providers, processors, or anti-fraud systems
- 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
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.
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
pci dss
dss
microservices
prometheus
storage
kafka
cicd
aws
technical expertise
high availability
fault tolerance
grafana
gitlab
nosql
cloud
sql
ai
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- Posted
- Mar 05, 2026
- Type
- Full-time
- Level
- Not Applicable
- Location
- London
- Company
- COLIBRIX ONE
Industries
Financial Services
Categories
Engineering
Information Technology
Related Jobs
3 roles aligned with this opportunity
View Job Details
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Senior Software Engineer (Golang)
2026-06-19
Full-time
Not Applicable
Sweden
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Engineering
View Job Details
Related
DevOps Engineer
2026-06-19
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Software Engineer - Go (Golang) (m/f/d)
2026-06-19
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