Backend Software Engineer

This role is only open for candidates that are legally allowed to work within the Philippines We are seeking a mid- to senior-level Backend Software Engineer to design, build and improve the services that power marketplace and eCommerce integrations. You will own features end-to-end—developing REST APIs and microservices, improving performance and reliability—while working closely with the support/integration team on production issues and API changes. This is a development-centric role with strong domain exposure to marketplace APIs, order/inventory/product flows, webhooks and the operational realities of high-volume integrations. The ideal candidate combines solid engineering craft with the pragmatism required to keep real customer integrations healthy. Responsibilities Design, develop and maintain backend features and microservices that power marketplace integrations. Build and evolve REST APIs; improve performance, scalability and observability. Contribute to integrations with Amazon, eBay, TikTok Shop, Mirakl, Walmart, Shopify, Adobe Commerce, Salesforce Commerce Cloud, BigCommerce and WooCommerce. Implement API upgrades, authentication flows (OAuth/JWT), robust webhook receivers, order/inventory/product/pricing/shipment synchronisation logic, and resilient error handling/retry strategies. Own unit and integration testing for the features you deliver; participate in code reviews and continuous improvement of development practices. Collaborate on architecture decisions and support the production support team with deep technical investigation when required. Participate in release activities (smoke/regression testing, monitoring) and help coordinate with offshore engineering teams. Communicate progress, risks and technical recommendations clearly across time zones. Required Skills & Experience Strong proficiency in one or more of: Java (Spring Boot preferred), Node.js, or Python. Solid experience with REST APIs, JSON, OAuth/JWT, webhooks and HTTP. Hands-on experien