Integration Developer - Position 1

We are looking for two Mid-to-Senior Integration Developers to join a project team migrating APIs and integrations from MuleSoft to Quickwork. Both roles require a similar technical background, with each developer taking ownership of a different set of integrations.

This opening is for Position 1, focusing on backend, data and address-related integrations. You will work alongside another Integration Developer, a Technical Lead, platform specialists and QA to deliver tested, production-ready solutions that preserve the functionality and performance of the existing APIs.

 Location: Bulgaria / Remote

Allocation: Full-time

Expected project duration: Approximately six months

Seniority: Mid to Senior — typically 3–6 years of relevant experience

Key Responsibilities

• Develop Quickwork journeys based on existing MuleSoft API behaviour, target architecture and agreed platform patterns.

• Implement REST API endpoints and integrations in accordance with OpenAPI specifications.

• Build data transformations, request validation and token-based authentication.

• Handle backend errors, timeouts, invalid payloads and missing required headers.

• Write unit and integration tests covering successful operations and error scenarios.

• Compare migrated API responses with the existing MuleSoft implementation and resolve discrepancies.

• Maintain technical documentation covering journey purpose, inputs, outputs, transformations and error handling.

• Participate in peer reviews and collaborate with the Technical Lead, platform specialists and QA.

• Support deployment, production cutover, troubleshooting and handover.

Required Skills & Experience

• 3+ years of integration development using MuleSoft, Workato, Boomi, Azure Logic Apps, Quickwork or a comparable platform.

• Hands-on experience implementing and consuming REST APIs.

• Ability to read and implement OpenAPI 3.0 specifications, including request and response schemas, parameters, authentication and error responses.

• Practical JavaScript / Node.js skills for JSON processing, field mapping, array operations, conditional logic, type conversion and function debugging.

• Experience implementing OAuth2, JWT or API-key authentication, from both API consumer and provider perspectives.

• Understanding of HTTP status codes, request validation, API error handling and timeout behaviour.

• Experience with API testing, integration testing and troubleshooting.

• Familiarity with version control, CI/CD and development, test and production environments.

• Basic understanding of TMF API standards and awareness of MEF Sonata, including their use in address validation and service qualification.

• Ability to communicate technical issues clearly, raise blockers promptly and produce practical documentation.

Nice to Have

• Previous experience developing Quickwork journeys.

• Experience implementing TMF622 or TMF645 APIs.

• German language skills.

Position Focus

This position concentrates on backend and data integrations, alongside address-related system and process APIs.

The expected scope includes:

• Currency-rate processing, AWS S3 backups and CDC synchronisation.

• Address integrations, geocoding, place lookup and geo-validation.

• MEF tools and Geographic Address Management (GAM) process APIs.

• Data mapping and integration with the relevant external services.

Experience with Google Maps API, AWS S3 API and Salesforce REST API would be particularly valuable for this position.