Hello, I'm |

My areas of interest front-end development, back-end development to build innovative, scalable, and efficient web solutions.

With a detail oriented-focus, I enjoy creating simple but effective solutions to improve application performance, ease of maintenance, and user experience.

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Showcases

These are some of my highlight projects.

Projects

These are my open source projects which are fetched directly from Github. If you're a developer, feel free to make a pull request!

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Gülşah Düzgün

GulsahDuzgun

tal
This project is made on Shopify. I made this website's sections would be able to change by customer's request.
HTML JavaScript CSS
Longhorn Games
A dashboard for Longhorn Games to compare games, add new game ideas and keep it track to ideas status. I add some features like list, edit, delete and add new game ideas.
NodeJS Next.js Tailwind JavaScript
Longhorn Dashboard API
Longhorn Dashboard API is a projeject which I built with NodeJS, Express, Mongoose. Also I used Amazon s3 for storing data and created tables on Mongoose for storing data.
NodeJS JavaScript
The-Wild-Oasis-Website
The Wild Oasis Website is a website project which I built with Next.js and Supabase. I used Next.js, NextAuth.js, React.js, React-DOM, Tailwind.
JavaScript ReactJS Next.js Tailwind
WorldWise
WorldWise is a website which you can keep register for your travel by marking the world map. I used React.js(useState, useEffect, useContext, useReducer), CSS, HTML.
JavaScript ReactJS CSS HTML
Mapty
I used Leaflet.js, Mapbox, JavaScript, CSS, HTML while I was coding this project. I hosted this project on Netlify.
JavaScript CSS HTML
Bankist
Bankist is a website hosted on Netlify. I used Observer API, lazy loading while fetching images, DOMContentLoaded event.
JavaScript CSS HTML
The Wild Oasis
The Wild Oasis is a website project which I built with React Query and Supabase. I used Styled Components, Context API, React Router, React Query, React Hook Form, Supabase
JavaScript ReactJS CSS HTML
usePopcorn
It's a website which you can search movies, add them to your watchlist, give points and see the details of the movie. I used HTML, CSS, React.js(useState, useEffect, useRef) and OMDb API. OMDb API
JavaScript ReactJS CSS HTML

Skills

JavaScript JavaScript
TypeScript TypeScript
React React
Node.js Node.js
Java Java
HTML HTML
CSS CSS
Shopify
SCSS SCSS
Git Git
Express Express
Next.js Next.js
Bootstrap Bootstrap
Vue.js Vue.js
Bulma Bulma
Tailwind CSS Tailwind CSS
Angular Angular
Styled Components Styled Components
GraphQL GraphQL
PostgreSQL PostgreSQL
Redux Redux
Material-UI Material-UI

My Experiences

Internship

Softtech

July 2022 - December 2022

I completed my 6 month internship at Softtech, where I worked on Front-End development using the Vue framework. At the first week of my internship, I improved my skills on Vue and later successfully completed tasks involving Html/Css and Js.

Product Consultant

BilgeAdam

February 2023 - December 2023

I was employed as part of the BilgeAdam talent program. During this period, I created end-user interfaces using HTML, CSS, jQuery, and Javascript, and provided support to customers for internal tecnologies.

Full-Stack Developer Consultant

Longhorn Games

January - October 2024

I have been working as a Front-End Developer Consultant at Longhorn Games for 1 year. Longhorn is a company that develops mobile games. I worked on the company website and its dashboard. This dashboard was designed to track game projects, monitor and compare other games in the market, store new game ideas, and upload game images. On the backend, I prepared and tested the necessary endpoints for the games, ensuring that the images were uploaded to Amazon S3 and served from there. During my time at Longhorn, I have worked with technologies such as Tailwind CSS, Styled Components, Next.js, React.js, React Query, React Router, React Hook Form, and Express.js.

Freelance Front-End Developer

Tal Project Website

October 2024 - February 2025

I launched Tal website. It is built on Shopify. All components have been added to be customizable from the dashboard. The product sales system is integrated through the Iyzico payment system. The site is set up to be multilingual. Social media integration and a contact form have been added. The search section is designed to allow searching on products.

Full Stack Developer

Sporsepeti App

March 2025 - May 2026 · 1 yr 3 mos

Developed a comprehensive sports facility marketplace platform using Next.js and TypeScript, enabling facility owners to create activities that are inspected and approved by Sporsepeti admin. Designed and implemented two different layouts for admin and facility owner. Built admin dashboard modules including facility and activity approval workflows, user management systems, and real-time video recording management for monitoring facilities. Implemented role-based authentication using Firebase Auth with JWT-based middleware to manage access control for Admin, User, and Camera Manager roles. Utilized Redux Toolkit and TanStack React Query for state management, Material-UI and react-hook-form. Integrated Firebase Data Connect with GraphQL for PostgreSQL data management. Using PostgreSQL and Firebase Data Connect's GraphQL-native schema, created a relational database structure spanning 15+ interconnected tables (facilities, polymorphic activity types, instructors, reservations) with proper foreign key relationships and referential integrity. Authored the GraphQL API layer with typed queries featuring pagination, multi-condition filtering, time-based expressions, and deeply nested relational joins across all domain entities. Created mutations for full CRUD operations, including complex atomic multi-table transactions for activity creation, facility onboarding, and ticket purchasing workflows.

Contact

Feel free to reach out if you want a to build something together, have a question, or just want to connect.

duzgun.gulsah27@gmail.com

Let's connect.