Merchant Integration Engineer

Location: Riga, Latvia Workplace: hybrid About the Client Our client is a prominent Electronic Money Institution (EMI) dedicated to providing online payment processing solutions. They offer a comprehensive suite of services, including payment gateway services, global payment processing, merchant accounts, open banking, recurring payments, and mass payments. Catering to online businesses across a variety of sectors, they support multiple currencies and payment methods, enabling efficient global transactions. Role Overview Join an international team as a Merchant Integration Engineer , where you will be at the forefront of ensuring seamless integrations between merchants and payment systems. This role offers the chance to work with cutting-edge APIs, diagnose complex issues, and directly influence the success of merchant integrations. The hybrid work environment based in Riga allows for a balance of remote and in-office collaboration. Key Responsibilities Support and maintain integrations between merchants and payment systems. Diagnose integration issues by analysing logs and tracing API requests and responses. Reproduce bugs and prepare clear technical escalations for developers, including what was sent, what was received, and where the behaviour differs from the specification or expected result. Test integrations against technical specifications before go-live. Perform sandbox testing and verification after system or integration changes. Work with server-to-server REST API integrations. Troubleshoot asynchronous payment flows involving webhooks, callbacks, and status polling. Configure and troubleshoot payment plugins and modules for CMS platforms such as WooCommerce and OpenCart. Communicate directly with technical teams in English and/or Russian. Maintain integration documentation, onboarding checklists, FAQs, and common troubleshooting scenarios. Follow information-security requirements when working with payment and sensitive data, including proper handling of masked data, credentials, test accounts, tickets, screenshots, chats, and external services. Requirements Experience in Integration Engineering, API QA, or a similar technical role. Strong hands-on knowledge of REST APIs, HTTP, JSON, and Postman. Ability to read technical documentation and existing code, troubleshoot integrations, and clearly communicate technical issues. Working knowledge of PHP/Laravel, JavaScript, SQL, and MySQL/MariaDB. Familiarity with Git, Swagger/OpenAPI, Browser DevTools, Kibana/Grafana, and Jira. Good understanding of information security and handling sensitive data. English B1+. Experience with payments/acquiring (3DS, webhooks, transaction statuses, payment response codes), WooCommerce/OpenCart integrations, PCI DSS, or technical customer support would be a nice to have. Languages: English, Russian. Experience in fintech. Key Soft Skills Strong problem-solving mindset - able to investigate technical issues systematically and identify root causes. Clear communication - able to explain technical issues clearly and collaborate effectively with merchants and engineering teams. Attention to detail & ownership - careful with technical specifications, testing, and sensitive payment data, and takes responsibility for issues through resolution. What We Offer Competitive salary aligned with experience Collaborative and transparent team culture High-impact role in a scaling fintech company Recognition of personal milestones and achievements Social benefits