Description ICF is seeking a On-call Full-Stack Developer to provide support for a portfolio of provider search and discovery websites as well as e-commerce and rebate platforms. This role requires a flexible engineer who can work across multiple technology stacks—including Shopify/Liquid, Node.js/Express, PostgreSQL, and AWS, as well as Next.js (React), Azure-hosted APIs, and SQL Server—while delivering reliable, high-quality solutions that keep this portfolio of sites running effectively. The successful candidate will bring strong full-stack development experience across both modern JavaScript frameworks and Shopify’s ecosystem, combined with solid cloud and database skills spanning AWS and Azure. They will be comfortable owning work end-to-end—from diagnosing production issues to shipping new features—across platforms with different business contexts. This is a remote, on-call role that provides flexibility to work from 0 to 20 hours per week. About On-Call Employment with ICF Given the seasonal or project-specific nature of this project, ICF often hires professionals as “On-Call” employees. On-Call employees work on an as-needed basis and are not guaranteed for a minimum number of hours. On-Call employees may work on concurrent projects outside of their ICF assignment (as long as their outside work does not create a conflict of interest with the work they do for ICF). When work is available, ICF will contact the On-Call employee with an assignment. On-Call positions are benefits-eligible based on hours worked. This position is not eligible for immigration sponsorship.

Key Responsibilities

Support, maintain, and enhance websites built on Shopify with Liquid templating and custom Node.js/Express backend integrations, including cart, checkout, and rebate processing flows. Develop and maintain features on the provider search and discovery websites using Next.js (React) with server-side rendering, connecting to Azure-hosted APIs and data services. Write, optimize, and troubleshoot queries across PostgreSQL and SQL Server databases, ensuring data integrity and query performance. Diagnose and resolve production issues across the website portfolio quickly and effectively, with clear communication to stakeholders throughout the incident lifecycle. Collaborate with project managers to implement new features, UI enhancements, and QA tests across the website portfolio. Manage cloud infrastructure tasks within AWS and Azure environments, including deployments, monitoring, and related operational support. Build and maintain CI/CD pipelines and deployment workflows across the website portfolio. Maintain clear technical documentation for systems, data models, integration patterns, and deployment procedures across the website portfolio. Perform other duties as assigned. Basic Qualifications 5+ years of full-stack web development experience. Hands-on Shopify development experience, including Liquid templating, Shopify CLI, theme customization, and app or API integrations. Proficiency in Node.js and Express for RESTful backend API development. Experience building production applications with Next.js and React, including server-side rendering (SSR) and static generation (SSG) patterns. Strong SQL skills with experience in PostgreSQL and/or Microsoft SQL Server. Demonstrated experience deploying and operating workloads on AWS (EC2, S3, RDS, Lambda, or equivalent services) and/or Azure (App Service, Azure SQL, Blob Storage, or equivalent). Experience with CI/CD pipelines (GitHub Actions, Azure DevOps, or comparable), Git-based version control workflows, and JIRA for transparent task tracking and visibility to project managers. Preferred Skills/Experience Shopify Plus experience, including headless commerce or custom storefront architectures. Familiarity with Azure-specific data and integration services (Azure Functions, Azure Cognitive Search, Azure Data Factory, Cosmos DB, or Azure DevOps pipelines). Experience with e-commerce domain concepts including rebate processing, promotional pricing engines, product catalog management, and order management. Experience building or maintaining provider directory, search, or discovery platforms with faceted filtering, geolocation, or relevance ranking. Knowledge of data-driven web application patterns: API-first architecture, server-side caching, and Azure-based data pipelines. Familiarity with monitoring and observability tooling (Datadog, Azure Monitor, AWS CloudWatch, Sentry, or similar). Experience supporting multiple distinct platforms or products simultaneously in an on-call or shared-services engineering model. Working at ICF ICF is a global advisory and technology services provider, but we’re not your typical consultants. We combine unmatched expertise with cutting-edge technology to help clients solve their most complex challenges, navigate change, and shape the future. We can only solve the world's toughest challenges by building a workplace tha