Mohammed Saalim K

Full-Stack Developer
USEEIO Model Specialist | Environmental Data Visualization

About Saalim

Passionate full-stack developer with 3+ years of experience in React development and environmental data visualization, specializing in USEEIO model integration and interactive chart development. Currently serving as Lead Developer for USEEIO updates at Model.Earth, where I've built advanced D3.js visualizations and solved complex data processing challenges for EPA's environmental impact models.

"Saalim picked up USEEIO the fastest of anyone I've worked with. Great React and data skills."
- Loren Heyns, Data Scientist & Project Lead

Model.Earth Contributions

🔧 Production Bug Fixes

Fixed critical 4-year-old hash retention bug in USEEIO React widgets. Implemented intelligent URL parameter merging for seamless navigation state preservation.

React JavaScript URL Management

📊 USEEIO v2 Integration

Migrated bubble chart from hardcoded v1 data to dynamic v2 JSON API integration. Supports all US states with 73 sectors per state, loading data dynamically from GitHub.

D3.js API Integration Data Visualization

💼 Advanced Analytics

Implemented D matrix × q vector calculation for actual job quantities display. Built smart decimal formatting and comprehensive UX interaction overhaul with single-selection mode.

// Calculate actual JOBS quantity: jobs = q[sector] × D[JOBS][sector] const actualJobs = output * jobCoefficient;
Matrix Math Data Science UX Design

🚀 Professional Development

Created comprehensive PR documentation with detailed technical changes and test plans. Demonstrated production-level software development practices.

Git Documentation Code Review

Technical Expertise

Frontend & Data Visualization

React.js TypeScript JavaScript (ES6+) D3.js Redux Material-UI Responsive Design Data Visualization Interactive Charts

USEEIO & Environmental Data

USEEIO Model Integration Environmental Data Analysis Matrix Mathematics NAICS Sector Mapping EPA Data Processing Economic Impact Modeling State-Level Data Analysis JSON API Integration

Backend & APIs

RESTful APIs API Integration .NET Core C# Python PostgreSQL MongoDB Entity Framework Core

Development & Performance

Performance Optimization Lazy Loading Event-Driven Architecture Git GitHub Docker CI/CD Unit Testing

Professional Experience

DreamStudio (Model.Earth - EPA USEEIO Project) | Lead Software Developer

09/2025 - Present | Chicago, Illinois

  • Lead USEEIO widget development integrating EPA's v2 state economic models into interactive visualizations
  • Fixed critical retention bug in React TypeScript widgets using URLSearchParams API, eliminating navigation state loss
  • Built D3.js bubble charts with RESTful JSON API integration, real-time animations, and event-driven state filtering
  • Developed automated data processing pipelines with NAICS sector mapping algorithm using React hooks and Papa Parse

Tata Consultancy Services (Humana Healthcare) | ASP.NET Developer

02/2022 - 09/2023 | Louisville, Kentucky

  • Designed RESTful Web APIs using .NET Minimal API for wellness rewards platform serving 500K+ users
  • Implemented Confluent Kafka event-driven microservices (40% efficiency improvement, 25% less downtime)
  • Built SOA-compliant .NET API with MongoDB Atlas handling 10M+ records (sub-200ms response times)
  • Achieved 90% test coverage using XUnit and MOQ (reduced production defects by 45%)

Newgen Software Technologies | Full Stack Developer

02/2021 - 02/2022 | Chennai, India

  • Enhanced OCR/ICR document processing app using .NET (C#) and ReactJS with gRPC microservices (35% lower latency)
  • Developed partial data masking feature for sensitive documents using Python/OpenCV (saved 20+ manual hours/month)
  • Refactored legacy Document Identification API to microservices (60% faster processing, 25% fewer errors)
  • Optimized multi-database operations across MSSQL, PostgreSQL, Oracle with EF Core and Dapper (30% less DB latency)

Open Source Contributions | Microsoft PowerToys & Polly .NET

01/2025 - Present

  • PowerToys: Built "No leading spaces" option for WPF-based Hosts File Editor (PR #41206)
  • Polly: Designed high-performance HybridCache strategy for Polly.Caching (PR #2709)

Live Projects

🌊 Interactive Bubble Chart

Dynamic environmental impact visualization with real-time data loading and actual job quantity calculations. Implemented state-specific conversions for new 50-state USEEIO v2 models (building on Nazanine and Loren's initial chart). Features a new interactive upper-right info panel for highlighted industries with auto-refresh on state/indicator changes and dark mode support.

View Live Chart

📊 USEEIO v2 Integration

Seamless integration with GitHub-based JSON API supporting all US states with 73 sectors per state.

View Data Source

🔧 Hash Retention Fix

Production-level bug fix ensuring URL state preservation across widget interactions.

View PR #11

Ready to Collaborate?

I'm passionate about environmental data science and always excited to work on meaningful projects that make a difference.

Get In Touch View GitHub View Full Portfolio