Developer Needed for API & Third-Party Integrations

We are looking for an experienced Integration / Full-Stack Developer to help us build and manage integrations between our platform and various third-party applications, APIs, and business systems. The ideal candidate should be comfortable working with REST APIs, webhooks, authentication, data synchronization, and complex business workflows. Key Responsibilities Integrate third-party platforms and business applications with our system Develop and maintain REST API integrations Implement webhooks for real-time data synchronization Handle API authentication such as OAuth 2.0, API keys, and tokens Build two-way data synchronization between systems Map, transform, validate, and synchronize data across platforms Develop custom APIs where required Handle API errors, retries, rate limits, and failed transactions Build automated workflows between different systems Integrate payment, CRM, ERP, booking, communication, and other business platforms Maintain integration logs and monitoring Ensure integrations are secure, scalable, and reliable Troubleshoot existing integrations and resolve synchronization issues Platforms & Technologies Experience with some of the following is highly valuable: Salesforce HubSpot QuickBooks Shopify / WooCommerce Stripe / PayPal Twilio / SendGrid Google APIs Zapier / Make Odoo / ERPNext Custom REST / GraphQL APIs Webhooks OAuth 2.0 Ideal Candidate We are looking for someone who has hands-on experience with: API integration and middleware development REST APIs and webhooks OAuth and API authentication Data mapping and synchronization Third-party SaaS integrations Backend development Automation and workflow development Debugging complex integration issues Experience working with Node.js, Python, PHP, or similar backend technologies is preferred. What We Expect Clean and maintainable integration code Strong understanding of APIs and data structures Ability to work with incomplete or poorly documented APIs Strong debugging and problem-solving skills Proper handling of errors, retries, and edge cases Clear communication and documentation Ability to understand business requirements and translate them into integration workflows Project Approach The work may involve multiple integrations and projects, so we are looking for a developer who can work with us on a long-term basis. Some projects may involve connecting multiple systems together, while others may require troubleshooting or improving an existing integration. Please include: Examples of API integrations you have developed. Third-party platforms you have worked with. Your experience with webhooks, OAuth, and data synchronization. Your preferred backend technology. Your hourly rate. A brief description of the most complex integration you have worked on. We are looking for someone who can take ownership of integrations from API discovery and development through testing, deployment, and ongoing maintenance.