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Available for hire

Hi, I'm David R

Full-Stack Developer specializing in database systems, ETL pipelines, and business applications that deliver measurable ROI

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// Measurable Impact

$80K+
Annual Cost Savings
Full-Stack Billing Application
75%
Process Acceleration
Billing Workflow Automated
60%
Productivity Increase
Manual Data Entry Eliminated
5 Hour
Runtime Reduction
Nightly Batch Query Optimized

// Technical Skills

Frontend

React TypeScript JavaScript HTML CSS Tailwind CSS XAML

Backend

Node Express Python C# (.NET) RESTful APIs Mongoose

Database

T-SQL Query Optimization Schema Design MongoDB SQL Server

Tools & DevOps

Git Postman JIRA CI/CD ClickOnce Render Agile/Scrum

// Professional Experience

Freelance Contractor
Contract · Hybrid
Melville, NY

Software Developer

  • Cut 5 hours from a nightly SQL Server batch job by rewriting queries, adding indexed views, and tuning indexes based on execution plans
  • Built a HubSpot CRM sync with two trigger mechanisms, real-time webhooks and a scheduled cron job, with retry logic and audit logs
  • Automated property data synchronization for a platform serving thousands of agents, using OData APIs with server-side filtering and pagination
  • Participated in Agile/Scrum workflows using JIRA for task and sprint management
T-SQL Python SQL Server HubSpot API OData
FONAR Corporation
Full-time · Hybrid
Melville, NY

Software Developer

  • Led greenfield C# WPF medical billing application from requirements gathering to production deployment, delivering $80K in annual cost savings
  • Designed the database schema and application architecture (MVVM), keeping business logic in its own service layer separate from the UI
  • Built a Python ETL pipeline with duplicate detection, transaction rollbacks on failure, and data validation, saving 15 hrs/week per employee
  • Conducted user acceptance testing with clinical staff to validate billing workflows against real-world usage before go-live
  • Achieved 75% faster billing workflows and 80% reduction in insurance claim rejections. System remains in production
C# .NET Python SSIS Git WPF SQL Server
Sikorsky Aircraft
Contract · Hybrid
Bridgeport, CT

Business Intelligence Developer

  • Migrated legacy Hyperion infrastructure to Tableau & Power BI
  • Built automated dashboards tracking production workflow status, replacing delayed manual reporting with real-time visibility for operations teams
  • Reverse engineered an undocumented legacy database schema to map data sources for the migration, enabling accurate reporting continuity across systems
Tableau Power BI SSRS SQL Server Hyperion

// Featured Work

Full-Stack Notes Application

End-to-end TypeScript MERN application with a RESTful API, MongoDB Atlas, automated CI/CD on Render, and a custom domain

Source Launch
Frontend
React.js/TypeScript with Vite bundler, deployed as static site on Render
Backend
Node.js/Express RESTful API with CRUD operations
Database
MongoDB Atlas with Mongoose ODM, automatic backups
DevOps
CI/CD via GitHub integration, separate frontend/backend deployments
Status: Live in production

Let's Build Something Together

Have a project in mind? Let's talk.

hi@davidr.io LinkedIn