Hi there, I'm
Mostafa Nassr
Full Stack Developer
Building high-performance applications with React, TypeScript & Node.js
About Me
I'm a Full Stack Developer with over 5 years of experience building high-performance web applications. I specialize in React, TypeScript, and Node.js, and I've had the privilege of working at companies like S&P Global, Tesla, and UnitedHealth Group.
I'm passionate about creating elegant, scalable solutions that make a real impact — from global dashboards used by hundreds of service centers to AI-driven tools that save millions in operational costs. I thrive on turning complex problems into intuitive user experiences.
Work Experience
S&P Global
Full Stack Developer
- Added asynchronous drill down functionality to React Highchart components that enabled chart data drilling and enhanced load times by 45%.
- Refactored and improved reusable dropdown components to use React Portals instead of context, fixing numerous visualization bugs.
- Added React routing to multiple areas of the application – enhanced the user experience by improving shareability and user selection persistence.
- Added integration to internal AI tool (Spark AI) in Node.js to generate dynamic PDF summary documents that got autonomously attached to emails and sent to internal teams.
- Added Jira integration to automate manual processes in Node.js that included Epic creation & tracking.
- Added user collaboration features and real-time notifications using React, TypeScript, Node.js, and Socket.io.
Tesla
Software Development Engineer
- Developed and launched a global dashboard from scratch using React, TypeScript and Node.js that is now used by 378 Tesla service centers worldwide, boosting capacity utilization by 38%.
- Architected and delivered a rich analytics dashboard with React and TypeScript that consumed data heavy endpoints and used Recharts for visualizations.
- Led the development of an AI agent chat bot UI in React, TypeScript and Node.js that automated technician reassignment, zone creation and customer query resolution – reducing operational costs by an estimated $3 million per quarter.
- Designed and built a dashboard used by 276 Tesla sales stores to manage, visualize and reassign extended demo drive appointments, cutting task management complexity by 40%.
- Built and published a reusable widget enabling different Tesla applications to integrate with the Tesla Scheduling System seamlessly.
- Optimized frontend component architecture and state management across React codebases, reducing development duplication by 32%.
UnitedHealth Group
Software Engineer
- Engineered a high-performance dashboard that consumes data heavy APIs using React, TypeScript, and Node.js, built with Material UI data grids and react-chartjs-2 charts.
- Unified 22 disparate frontend applications into a single console using single-spa, reducing maintenance overhead across multiple teams.
- Developed an AI driven chat bot UI module with React, TypeScript and Node.js that answered user questions and surfaced live system status.
- Developed a customizable wrapper for the Material UI data filter component to handle specific business needs.
- Enhanced CI/CD pipelines for frontend deployments – reduced build times by 20% and lowered integration issues and rollbacks by 30%.
- Upgraded frontend error handling and monitoring to drive a 25% reduction in system downtime and 45% reduction in related operational costs.
Randstad Technologies
Sr. React Frontend Developer
- Developed 20+ reusable React components, accelerating frontend development by 40%.
- Increased unit test coverage from 42% to 86% using Jest and React Testing Library, significantly improving code reliability.
- Shipped and debugged over 100,000 lines of React, TypeScript, and Node.js code, ensuring seamless feature rollouts.
- Engineered a fully reusable component library with React that accelerated team-wide delivery and scaled to serve multiple projects across business units.
Skills & Technologies
Languages
JavaScript
TypeScript
HTML
CSS
Python
SQL
Frontend
React
Redux
React Query
jQuery
Material UI
Recharts
Highcharts
Figma
Enzyme
React Testing Library
Backend
Node.js
Express
Flask
FastAPI
PostgreSQL
MongoDB
Firebase
Azure
Hugging Face
OpenAI
Git
Docker
Kubernetes
Kafka
Jenkins
Education
Rutgers University
B.S.
Springboard
Software Engineering Career Track, Certification
- Completed a 9-month intensive boot-camp in Software Engineering methodologies and technologies.
- Mastered frontend development (HTML, CSS, JavaScript, React, Redux) and backend development (Node.js, Express, Python, Flask, SQL, PostgreSQL).
- Mastered Data Structures & Algorithms including Linked Lists, Stacks, Heaps, Queues, Graphs, Hash Tables, Binary Trees, and sorting algorithms.
Get in Touch
Have a project in mind or want to chat? Drop me a message and I'll get back to you as soon as possible.