Salary: £65,000 - 105,000 per year Requirements: 5 years of professional software engineering experience Strong Ruby on Rails development experience PostgreSQL database experience Experience building and maintaining API integrations Experience designing and consuming REST APIs Experience supporting or developing customer-facing APIs Strong understanding of webhooks and event-driven systems Experience working with JSON, XML, CSV, and data imports Experience integrating third-party ecommerce, inventory, or business systems Experience working with AWS-based environments Docker experience Git and GitLab experience Strong troubleshooting and problem-solving skills Ability to independently manage technical projects and integrations Marketplace platform experience is highly desirable Ecommerce platform integration experience is highly desirable Experience integrating platforms such as Shopify, WooCommerce, Magento, Wix, BigCommerce, Linnworks, ERP systems, inventory management systems, or custom software is highly desirable Experience building inventory synchronisation systems is highly desirable Sidekiq and Redis experience is highly desirable Elasticsearch experience is highly desirable Terraform experience is highly desirable Automotive industry knowledge is highly desirable Familiarity with automotive inventory catalogues, OEM and aftermarket part numbers, vehicle compatibility and fitment information, breaker and dismantler inventory systems, automotive ecommerce platforms, and product categorisation and taxonomy is highly desirable Responsibilities: Review onboarding questionnaires submitted by new business sellers Assess seller inventory systems, ecommerce platforms, and technical capabilities Determine the most effective integration strategy for each seller Work directly with seller technical contacts and development teams where required Configure, implement, test, and maintain seller integrations Utilise and extend our Seller API to support business seller onboarding and inventory synchronisation Assist external developers and technical contacts in integrating with our API Troubleshoot onboarding and synchronisation issues Ensure business sellers can efficiently upload and maintain inventory on our platform Identify opportunities to create reusable integration solutions for commonly used platforms and systems Improve and streamline seller onboarding through automation and technical innovation Contribute directly to our Ruby on Rails codebase Build tools and automation that improve seller onboarding and inventory management Design and maintain scalable inventory synchronisation processes Build and maintain integrations using APIs, webhooks, data feeds, imports, and exports Monitor and optimise integration performance and reliability Collaborate with external development partners to ensure solutions are scalable, maintainable, and production-ready Follow established GitLab workflows, testing practices, and deployment processes Participate in architecture and technical design discussions Technologies: API AWS Docker ElasticSearch ERP Git GitLab Support JSON Magento PostgreSQL REST Rails Redis Ruby Shopify Terraform Wix XML Cloud Excel LESS Mobile Network Web More: We are ifndautoparts (I Find Auto Parts), a rapidly growing online marketplace dedicated exclusively to automotive parts. We are a family-owned, founder-led start-up operating with a lean, highly collaborative structure and working closely with specialist contractors and development partners to scale our platform. This is a remote/hybrid contractor role for a Senior Integration Engineer who will help businesses connect their inventory systems directly to our marketplace and shape the future of seller integrations across our platform. last updated 23 week of 2026