Golang Engineer - Payment Gateway Solutions - €70.000 - €90.000 A Year

Join COLIBRIX ONE - Innovating the Future of PaymentsAt 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. **) 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 processingDigital wallet infrastructureCross-border merchant accountsAlternative payment methods (APMs)Corporate accounts for legal entitiesWe’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.We’re seeking an experiencedGo Engineerto 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.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.Requirements:3-5 years of Go development experience focused on backend systems, and around 5 years of experience working with fintech applicationsUnderstanding of distributed systems, microservices architecture, and API design, including REST/RPC transportsExperience working with SQL and NoSQL databases, message brokers (Kafka, NATS), and caching systemsFamiliarity with CI/CD practices and tools, preferably GitLabExperience working with the AWS cloud platformAbility to contribute expertise and collaborate with the team on technical solutionsStrong communication skills and the ability to explain complex technical ideas to colleagues with varying levels of technical backgroundFluency in written and spoken English and RussianExperience in the fintech domainSecurity-by-design mindset: ability to design solutions with security considerations built in at every stageUnderstanding of regulatory requirements in the fintech space (e.G., PCI DSS, GDPR)Experience in performance optimization and building high-availability systemsExperience with observability tools: logging, metrics, tracing (Prometheus, Grafana, OpenTelemetry)Experience integrating with external payment providers, processors, or anti-fraud systemsWhat We Offer:Opportunity to shape the future of fintech solutions within a growing companyCollaborative, horizontal team structure that values your expertise and ideasContinuous learning and development opportunities to enhance your skills and career growthCompetitive salary and benefits packageFlexible work arrangements to support work-life balanceSalary Range:****** 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 jurisdictionThis position is offered within the COLIBRIX ONE.Employment will be under the appropriate legal entity based on the role and location.#J-*****-Ljbffr

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:3-5 years of Go development experience focused on backend systems, and around 5 years of experience working with fintech applicationsUnderstanding of distributed systems, microservices architecture, and API design, including REST/RPC transportsExperience working with SQL and NoSQL databases, message brokers (Kafka, NATS), and caching systemsFamiliarity with CI/CD practices and tools, preferably GitLabExperience working with the AWS cloud platformAbility to contribute expertise and collaborate with the team on technical solutionsStrong communication skills and the ability to explain complex technical ideas to colleagues with varying levels of technical backgroundFluency in written and spoken English and RussianExperience in the fintech domainSecurity-by-design mindset: ability to design solutions with security considerations built in at every stageUnderstanding of regulatory requirements in the fintech space (e.G., PCI DSS, GDPR)Experience in performance optimization and building high-availability systemsExperience with observability tools: logging, metrics, tracing (Prometheus, Grafana, OpenTelemetry)Experience integrating with external payment providers, processors, or anti-fraud systemsWhat We Offer:Opportunity to shape the future of fintech solutions within a growing companyCollaborative, horizontal team structure that values your expertise and ideasContinuous learning and development opportunities to enhance your skills and career

Madrid, España

Join COLIBRIX ONE - Innovating the Future of PaymentsAt 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. **) 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 processingDigital wallet infrastructureCross-border merchant accountsAlternative payment methods (APMs)Corporate accounts for legal entitiesWe’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.We’re seeking an experiencedGo Engineerto join our team and contribute significantly to our payment gateway product., growthCompetitive salary and benefits packageFlexible work arrangements to support work-life balanceSalary Range:****** 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 jurisdictionThis position is offered within the COLIBRIX ONE. Employment will be under the appropriate legal entity based on the role and location. #J-*****-Ljbffr