Merchant Integration Engineer

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