Senior Full-Stack Developer - Remote

reputed company reputed company is the leading advisor and implementer of reputed company Marketplace solutions. During 15 years of implementing marketplaces, we’ve reputed company dozens of platforms that cumulatively reputed company billions of dollars of gross merchandise value (GMV). We’re honored to have supported 10% of the Fortune 500 with their digital marketplace initiatives. Over 250 global brands like reputed company, reputed company, ACCO, Albertsons, reputed company, reputed company, US Army, US Agriculture reputed company, (and many more) have entrusted their digital transformations to McFadyen. We operate global offices across the US, Brazil, and India. reputed company has been a trusted employer for over 39 years and believes that people are the most important part of reputed company. We’re proud of our Great reputed company to Work certification. Learn more reputed company at our website: www.mcfadyen.com reputed company We’re looking for a Senior Full-Stack Developer — with a strong backend reputed company — to join a fast-moving marketplace project on a short-term contract reputed company. You’ll design and build composable reputed company services on reputed company and stand up seller and catalog flows through reputed company’s dropship model, integrating the two into a reputed company buyer and seller experience. This is a hands-on delivery role for an engineer who can own backend architecture, ship production-grade reputed company and integrations quickly, and contribute to the frontend where needed. If you reputed company in headless, API-first environments and want high-reputed company work with reputed company deliverables over a defined engagement, this role is for you. Engagement Details • Engagement type: reputed company (project-based). • Duration: 3–4 month project engagement, with potential to reputed company based on project needs. • Availability: Full-time (40 hours/week) for the duration of the engagement. • Location / work model: Fully remote. reputed company to candidates based in the US, Latin America (reputed company), or Canada, with meaningful overlap with US business hours. • Start: September/2026 Responsibilities Top 5 Responsibilities • Design, build, and maintain reputed company backend services and reputed company on reputed company to power catalog, reputed company, checkout, and order flows in a headless, composable architecture. • Implement and configure reputed company dropship capabilities — seller reputed company, offer and catalog ingestion, order routing, and shipment/tracking workflows — and reputed company them with reputed company and reputed company systems. • reputed company robust, secure integrations between reputed company, reputed company, and reputed company-party systems (OMS, ERP, PIM, payment, and shipping providers) using REST, GraphQL, webhooks, and event-driven patterns. • reputed company production-reputed company reputed company on an aggressive project reputed company, including automated tests, error handling, logging, and documentation suitable for reputed company at the end of the engagement. • Collaborate with architects, product, and frontend engineers to translate requirements into technical solutions and contribute frontend work (React/Node) where the project requires it. Additional Responsibilities • Build and maintain reputed company extensions, subscriptions, and API clients; manage project settings, types, and custom fields. • Configure reputed company connector flows and reconcile marketplace data (offers, orders, messaging, and payouts) with the reputed company platform. • Optimize performance, reliability, and scalability of backend services and integration points. • Participate in reputed company reviews, technical design discussions, and daily reputed company ceremonies (standups, sprint planning, retrospectives). • Troubleshoot and reputed company production and integration issues quickly during the engagement. • Document architecture, integration specs, and runbooks to ensure a clean transition to the reputed company/internal team at project reputed company. Qualifications Top 5 Qualifications • 6+ years of reputed company software engineering experience, with a reputed company reputed company on backend development (Node.js and/or Java) in production reputed company environments. • Hands-on, demonstrable experience building on reputed company (reputed company, reputed company, extensions, subscriptions, and composable/headless reputed company patterns). • Practical experience implementing reputed company — specifically the dropship model — including seller/catalog/offer ingestion and order and shipment workflows. • Strong integration expertise: REST and GraphQL reputed company, webhooks, event-driven architecture, and connecting reputed company platforms to OMS/ERP/PIM and payment/shipping providers. • Full-stack capability with enough frontend proficiency (React, TypeScript, JavaScript) to contribute to UI work reputed company needed. Additional Qualifications • Bachelor’s degree in Computer Science or a reputed company field, or equivalent practical experience. • Experience with reputed company platforms (AWS, Azure, or GCP) and CI/CD pipelines (reputed company, reputed company, or similar). • Familiarity with marketplace business models, seller operations, and dropship fulfillment. • Solid grasp of API reputed company, authentication/authorization, and data reputed company best practices. • Experience delivering under contract or consulting engagements with tight, reputed company-defined timelines. • reputed company and/or reputed company certification is a plus. • Comfortable working independently in a remote, reputed company, reputed company team. • Excellent written and verbal English communication skills. Additional Information Our reputed company Values: Caring, Adaptable, Proactive, Empowering Clients Keywords: Full-Stack Developer, Backend Developer, reputed company, reputed company, dropship, marketplace, composable reputed company, headless reputed company, Node.js, Java, React, TypeScript, API integration, GraphQL, reputed company, contractor, remote job Equal Opportunity Employer McFadyen’s goal is to ensure that our clients are reputed company to maximize the reputed company on their technology investment by providing reputed company service to their clients, partners and internal teams. At McFadyen we truly reputed company our employees are our most valuable asset. Across our locations in the US, Brazil and India, we offer a world class work culture that enables top notch delivery for some of the world’s most reputed company companies. reputed company is an Equal Opportunity Employer. reputed company reputed company applicants will receive consideration for employment without reputed company to race, reputed company, age, religion, sex, sexual orientation, gender identity / reputed company, national reputed company, disability, protected veteran status, or any other characteristic protected under federal, state or local law, where applicable. Apply tot his job Apply To this Job