Integration Engineer (JavaScript SDK & APIs)

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries. They are building a payment orchestration system consisting of a JavaScript frontend SDK for payment forms, a Golang backend API, and an internal CRM.

• Strong experience with JavaScript / TypeScript and frontend integrations.
• Experience working with frontend SDKs or third-party APIs.
• Ability to read and understand backend APIs (REST, JSON, auth flows).
• Comfort debugging issues across frontend and backend boundaries.
• Strong communication skills and ability to explain technical concepts clearly.
• High ownership mindset - care about integrations actually working in production.

Nice to have:

• Experience in payments, fintech, or checkout flows.
• Experience with React / Next.js.
• Familiarity with Golang APIs.
• Experience improving developer documentation.
• Previous experience in a Solutions Engineer or Integration Engineer role.

SDK Integration & Customer Support:

• Assist product teams in integrating the JavaScript payment SDK into their frontend applications.
• Help configure payment flows, callbacks, and error handling.
• Monitor support channels (Slack, tickets, shared chats, etc.).
• Answer technical questions related to SDK usage and API behavior.
• Guide teams through best practices for secure and reliable integrations.

Debugging & Issue Triage:

• Reproduce reported integration issues locally or in test environments.
• Debug frontend and API-related issues across JavaScript SDK, Backend Golang API, and CRM and configuration interfaces.
• Identify whether an issue is a real bug, incorrect integration or usage, or missing or unclear documentation.
• Escalate confirmed bugs to the development team with clear reproduction steps and context.

Documentation Ownership:

• Review and validate API and SDK documentation against real system behavior.
• Keep documentation in sync with current SDK and API versions.
• Identify missing examples, unclear explanations, or misleading flows.
• Proactively improve developer-facing docs based on integration feedback.

Internal Tooling & CRM:

• Use and understand the internal Next.js CRM.
• Help configure products, payment flows, and settings via the CRM.
• Provide feedback to the CRM team on usability gaps or missing functionality.
• Occasionally implement small frontend improvements if needed.

Feedback Loop & Product Impact:

• Act as the voice of integrators and product teams inside Ruby Labs.
• Share recurring issues, friction points, and improvement ideas with engineering and product.
• Help prioritize fixes and improvements based on real-world impact.
• Contribute to improving overall developer experience of the platform.

Applicants must be located within approximately ± 4 hours of CET (Central European Time) to ensure optimal collaboration and communication during working hours.