Stephen Stefanatos

Software Engineer & CTO

I enjoy building fullstack applications in both startup and enterprise environments.

Frontend
Backend
Architecture
Innovation
About Me

Who I Am

StephenStefanatos

Software Engineer & CTO

Location

Villanova, PA

Education

B.S. Computer Science, Penn State University

Current Role

Co-founder & CTO at SponsorLab

Upcoming

SDE Intern at AWS

Experience

2+ years in software development

Personal Interests

Web Development
Cloud Computing
Entrepreneurship
Problem Solving
New Technologies

My Journey

Istartedprogrammingin2020anddevelopedastronginterestincomputerscienceandhavebuiltpracticalprojectsincludingfreelancewebsitesandstartups.
Mytechnicalexperiencespansfull-stackdevelopment,withproficiencyinJava,JavaScript,Golang,andPython.I'veworkedwithmodernframeworksandtechnologiesincludingReact,Express,SpringBoot,andcloudplatformslikeAWSandGCP.
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Years of Experience
0+
Projects Completed
0+
Technologies
0
GPA

Core Technical Skills

I am comfortable on both frontend and backend, however I favor backend development.

Frontend
  • React & Next.js
  • JavaScript/TypeScript
  • HTML/CSS & Tailwind
Backend
  • Node.js & Express
  • Java & Spring Boot
  • SQL & NoSQL Databases
Experience

Work History

Career Path

My professional journey in software engineering and leadership.

Amazon (AWS)

Software Engineer Intern

SponsorLab

Co-founder & CTO

CTFGuide

Full Stack Engineer

Software Engineer Intern
Amazon (AWS)
Upcoming
Arlington, VA
May 2025 - Aug 2025
  • Upcoming internship for Summer 2025
Co-founder & Chief Technology Officer
SponsorLab
Villanova, PA
Jan 2024 - Present
  • Created SponsorLab, a sponsorship marketplace that helps creators and brands connect easily.
  • Built a backend web server with Nodejs, Postgres, and GCP, ensuring scalability and reliability.
  • Integrated Stripe API for secure payments, making transactions simple and automated for users.
  • Connected YouTube API so creators can share analytics, helping brands get accurate performance data.
Full Stack Software Engineer
CTFGuide
University Park, PA
Oct 2023 - Dec 2024
  • Added JWT authentication and middleware to improve security and make user logins safer.
  • Designed and documented backend API endpoints in JavaScript to handle CRUD operations.
  • Improved database queries by fixing indexing and optimizing joins, cutting response times by 10%.
  • Implemented the Stripe API to enable secure payments, ensuring smooth transactions and simple subscription management.
Projects

Featured Work

SponsorLab - Marketplace connecting content creators with brands
Featured

SponsorLab

Startup
2024 - Present
Team of 4
In Beta
Based in PA

A comprehensive marketplace platform connecting content creators with brands for sponsorship opportunities, featuring secure payments and analytics integration.

Key Features

Built a marketplace platform connecting content creators with brands for sponsorship opportunities.

Developed with Node.js backend, PostgreSQL database, and React frontend.

Implemented secure payment processing with Stripe and analytics integration with YouTube API.

Technical Highlights

  • • Integrated Stripe connected accounts
  • • Real-time messaging system using WebSockets
  • • Advanced analytics dashboard with data visualization
  • • Multi-factor authentication and role-based access control

Node.js
React
PostgreSQL
Stripe API
YouTube API
Main Line Realty - Real estate website with advanced search capabilities

Main Line Realty

Freelance
Jan 2025 - Feb 2025
Solo Project
Sold to Compass Agent
Philadelphia Area

A real estate website with advanced search capabilities, AI-powered assistance, and property data integration.

Key Features

Developed a custom real estate website tailored for an agent, providing advanced search/filter features.

Integrated an AI-powered real estate assistant to enhance tailored searching.

Implemented the Zillow API and Google Maps for property data and location insights.

Client Testimonial

"The custom real estate platform developed for our agency has significantly improved our online presence and lead generation. The AI-powered search features have been particularly valuable for our clients."

— Compass agent


AI
Google Maps
Zillow API
React
MainLine Cleaning - Booking platform for cleaning services

Main Line House Cleaning

Freelance
Feb 2025 - March 2025
Solo Project
In progress
Local Business

A comprehensive booking platform for cleaning services with user-friendly interfaces, feedback systems, and secure deployment.

Key Features

Designed and developed a cleaning service website using Next.js, Spring Boot, and MySQL.

Implemented a user-friendly booking system for clients and feedback collection.

Configured and deployed the application on a DigitalOcean VPS, using NGINX as a reverse proxy.

Technology Used

  • • Utilizing MySQL database
  • • Backend built in Springboot with Maven
  • • Domains run through cloudflare for DDOS protection & SSL

Next.js
Spring Boot
MySQL
DigitalOcean
NGINX
Skills

Technical Expertise

Full-stack developer with expertise in modern web technologies and cloud platforms. Passionate about creating scalable, user-friendly applications with clean code.

Programming Languages

Java

Expert

Backend & Enterprise

JavaScript

Expert

Web Development

TypeScript

Advanced

Type-safe JavaScript

Python

Advanced

Scripting & Data Analysis

Golang

Advanced

Backend & Microservices

SQL

Advanced

Database Queries

Frontend Technologies

React

Expert

UI Library

Next.js

Advanced

React Framework

HTML/CSS

Expert

Web Markup & Styling

Backend & DevOps

Node.js

Expert

JavaScript Runtime

Express.js

Advanced

Web Framework

Spring Boot

Advanced

Java Framework

PostgreSQL

Advanced

Relational Database

AWS

Advanced

Cloud Platform

Docker

Advanced

Containerization

GCP

Intermediate

Cloud Platform

Git

Expert

Version Control

CI/CD

Advanced

DevOps

Additional Skills & Tools

REST API
GraphQL
JWT
MongoDB
MySQL
NGINX
Linux
Stripe API
YouTube API
Google Maps API
Agile
Scrum
UI/UX Design
Responsive Design
Performance Optimization
Education

Academic Background

Penn State University

The Pennsylvania State University
B.S. in Computer Science
Expected: May 2026

GPA

3.70

Awards & Honors

  • Penn State Provost Award
  • Dean's List (3 Semesters)

Relevant Coursework

  • Systems Design in C
  • Data Structures & Algorithms
  • Theory of Computation
  • Artificial Intelligence
Contact

Get In Touch

Let's Connect

I'm currently open to new opportunities and collaborations. Feel free to reach out through any of these channels!

Contact Details

Location

Villanova, PA

Phone

+1 (610) 517-3410

Availability

Open to opportunities