Backend Integration Developer (PHP/Python) | Mid-Level to Senior

Location: Remote – Mexico Employment Type: Full-Time About Kwan Technology At Kwan Technology, we connect top engineering talent across Latin America with innovative U.S.-based companies. Our teams build scalable software solutions across industries including logistics, fintech, cybersecurity, healthcare, and SaaS. We are currently looking for a Backend Integration Developer to join one of our U.S. clients in the logistics and eCommerce industry. This is an exciting opportunity to work on large-scale integrations that support high-volume fulfillment operations and mission-critical business processes. About the Role As a Backend Integration Developer , you will design, develop, and maintain integrations between a Warehouse Management System (WMS) and multiple third-party platforms, including CRM systems, ERP solutions, shipping carriers, eCommerce platforms, and custom applications. This is a hands-on backend development role where you'll collaborate with a distributed engineering team, taking ownership of the integrations you build while helping ensure scalability, reliability, and performance. Responsibilities Design, build, and maintain backend integrations between a Warehouse Management System (WMS) and external platforms. Develop and maintain integrations with CRM systems, ERP platforms, carrier APIs, eCommerce platforms, and custom applications. Build RESTful APIs, webhooks, and data synchronization services. Develop data transformation and integration workflows. Implement and support EDI/B2B integration processes. Troubleshoot production integration issues and optimize system performance. Monitor data flows to ensure reliability and accuracy. Collaborate with product owners and engineering teams to deliver integration projects. Recommend improvements to architecture, performance, and development processes. Required Qualifications 3–7 years of professional backend software development experience. Strong experience with PHP or Python . Proven experience building third-party integrations and consuming external APIs. Solid understanding of: RESTful APIs Webhooks Authentication methods (OAuth, API Keys, JWT) Data mapping and transformation Experience working with MySQL or other relational databases. Experience integrating eCommerce platforms such as Shopify or similar. Strong debugging and problem-solving skills. Professional English communication skills (written and spoken). Ability to collaborate effectively with remote international teams. Preferred Qualifications Experience with Warehouse Management Systems (WMS). Experience with EDI standards and B2B integrations. Salesforce integration experience. Background in logistics, supply chain, or fulfillment systems. Experience with cloud platforms such as AWS, Azure, or Google Cloud Platform. Familiarity with message queues and event-driven architectures. Experience with CI/CD pipelines and deployment automation. Technical Skills PHP or Python REST APIs Webhooks MySQL API Integrations Shopify (or similar eCommerce platforms) EDI CRM & ERP Integrations Git Cloud Platforms (AWS, Azure, or GCP) What We're Looking For We're looking for a developer who enjoys solving integration challenges, writing clean and maintainable code, and taking ownership of their work. The ideal candidate is proactive, detail-oriented, and comfortable working in a collaborative environment with international teams. You should be passionate about building reliable backend systems that support business-critical operations.