Dalvir S.

I build and integrate healthcare software: FHIR and HL7 interfaces, EHR and EMR integrations, and HIPAA-aware web applications, plus the full-stack products around them. I have 12 years in software development, hold Top Rated Plus and 12,713 worked hours on Upwork, and work as part of the Matrix Marketers team. ➝ Healthcare integration - EHR integration: 500+ hours on an active engagement supporting the Celerity and Prognosis EHR systems. -HL7 interface work in Mirth Connect. - A Zoho CRM and Zoho Creator web portal for a healthcare organization, with role-based access (368 hours). - EMR API integration in a HIPAA-conscious React and Supabase application, connected to Microsoft Graph (SharePoint, Office 365) and Adobe Acrobat Sign. - SugarPros: a telehealth and chronic care management platform built for HIPAA requirements, with HL7 integration (Laravel, Node.js). ➝Full-stack and SaaS development - React, Next.js, Node.js and TypeScript across front end and back end, with Python for integrations and data work. - PostgreSQL, Supabase, MySQL and MongoDB, with Redis and Stripe on an active TypeScript and Node.js platform. - SaaS products end to end: a hospitality shift-scheduling app (Laravel and React), YouTube thumbnail and title A/B testing software (450+ hours), and dynamic job-posting workflows. Vue.js, Angular and Svelte on long-running client applications. ➝ CRM and API integration - Zoho CRM and Zoho Creator: custom web portals and API integration. - Third-party API work including Microsoft Graph, Adobe Acrobat Sign, Stripe and OAuth-scoped integrations. ➝ AI features - I add AI features to existing products by integrating LLM APIs into SaaS and business workflows. With the Matrix Marketers team, I helped build a new AI product from the ground up for a non-technical founder. ➝ Selected projects - UseDemand: website-visitor and campaign analytics for B2B sales (Node.js, Next.js, React). - Enotria & Coe: product catalogue for a UK wine and spirits distributor (MERN stack, Next.js). - Crema: multi-vendor specialty coffee subscription platform (JavaScript, MongoDB). - Jobtable: project administration software for construction companies (Laravel, MySQL). - Adfirehealth: virtual hiring events and campaigns for healthcare organizations (PHP, APIs). - MD Nancy: subscription e-commerce for health supplements (Shopify theme, AWS). ➝ What clients say Clients describe me taking over another team's code and getting their project to completion, delivering a technically complex project they thought might never come to life, and working through API logic and service integrations reliably. The first of those clients rehired me the day after the project closed. One wrote that they got "not just an engineer but a partner on a project." Other clients wrote that "he knows complex tasks and delivers," that I went above and beyond on a single sign-in system letting their customers manage data from many sources, and that I significantly improved an Angular application's styling without affecting its functionality. ➝ How I work I take work from requirements and architecture through build, deployment and long-term support. Several of my client engagements have run for two years or more, and I am comfortable inside existing codebases as well as new builds. Background: Bachelor's degree in Computer Engineering (PTU, 2012). With Matrix Marketers since April 2014, across 40+ Upwork contracts.