Ismet Kalayci

I'm Ismet Kalayci. I build software that automates everyday work and look after IT systems, from servers to websites.

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Software
& IT.

Full Stack Developer & IT NRW, Germany

About

I studied computer programming at Maltepe University in Istanbul and I'm continuing with web design and coding at Istanbul University. In Germany I've been admitted to Applied Computer Science at the University of Duisburg-Essen, and right now I'm in the preparatory German course.

For the last two years I built websites as a freelancer for all kinds of clients, from real estate agencies to fitness coaches. These days I mostly build systems for everyday work inside companies, like software that processes orders and invoices automatically so nobody has to type data in by hand.

I like working with hardware too. For my graduation project I built an Arduino smart home system, from the sensors to the app.

Projects

Company ERP system

A web-based ERP system I built from scratch for the company I work for, used every day. It brings together orders, quotes, invoicing and accounting, inventory, staff and field work. It includes AI-assisted reading of order PDFs, ZUGFeRD e-invoices with DATEV export, a Microsoft 365 integration for email, RFID time tracking and a role-based permission system.

Next.js · React · Node.js · PostgreSQL · Prisma · OpenAI API · Microsoft Graph · Electron

Business software

Personal trainer platform

A platform for personal trainers and their clients. Using AI, it calculates personal calorie and protein targets from weight, height and lifestyle, then builds a weekly meal plan from the ingredients you have at home. It includes over 1,500 animated exercise guides matched to where you train, a body fat calculator and much more.

AI-powered website

Company intranet

A multilingual intranet for a network and mobile infrastructure company, with DGUV safety content, document management, approval workflows, an IT helpdesk and role-based access.

TypeScript · React · Vite · Node.js · Express · SQLite

Internal portal

Real estate websites

Websites for real estate agencies where users can post listings and keep track of them. The agency manages all listings from an admin page.

Listings platform

Gym websites

Websites for gyms, from design to launch.

Freelance project

Company websites

Corporate websites for businesses, from design to launch.

Freelance project

3D configurator for illuminated signs

A website for LED and illuminated signs with a 3D configurator. Customers configure their sign by every dimension and the technology used, then buy it directly on the site. Orders are tracked on a dedicated admin page.

E-commerce

Inkverse

A mobile game I built with Godot. You draw with your thumb while the pen responds mirrored and distorted.

Godot

Mobile game

Smart home system

My graduation project at Maltepe University. An Arduino system with sensors for temperature, humidity, air quality, gas, fire and soil moisture, plus lighting control. A custom Android app lets you monitor and control everything remotely, with live readings and alerts.

Arduino · IoT · Android

Graduation project

Background

Experience

  1. 09/2026 –

    Full Stack Developer & IT · KHSystems GmbH

    Building internal software such as the ERP and intranet, and looking after all of the company's IT.

  2. 10/2024 – 10/2026

    Full Stack Developer · Freelance

    Websites and web platforms for clients such as real estate agencies and fitness coaches, from planning to launch. Remote from Turkey.

  3. 07 – 08/2023

    R&D Internship · Semkan Yazılım Danışmanlık

    Eskişehir, Turkey

Education

  1. 09/2026 –

    B.Sc. Applied Computer Science · Universität Duisburg-Essen

    Admission received, currently in the preparatory German course.

  2. 09/2024 –

    Web Design and Coding · İstanbul Üniversitesi

  3. 10/2021 – 07/2024

    Computer Programming (Associate Degree) · Maltepe Üniversitesi

    Graduated in 2024. Key courses: database management, data structures, object-oriented programming, web and mobile development, systems analysis and design, computer networks, operating systems and data mining.

Certificates

  • Applied Machine LearningTurkcell Geleceği Yazanlar
  • AI for BeginnersHP LIFE
  • Java Training CertificateBoğaziçi Üniversitesi
  • C Programming LanguageBTK Akademi
  • Programming Essentials in PythonPython Institute
  • Introduction to CybersecurityCisco
  • Web Development with HTML5BTK Akademi

Skills

Web
HTML, CSS, JavaScript (ES6+), TypeScript, React, Next.js, Tailwind CSS, Three.js, Node.js, Express, REST APIs
Databases
SQL, PostgreSQL, SQLite, Prisma
Other tools
Git, GitHub, OpenAI API, Microsoft Graph API, Electron
Hosting & deployment
Vercel, Netlify, Render, cPanel / Plesk, Windows Server
Systems & networking
Microsoft 365, Synology NAS, OpenVPN, PowerShell
Design & 3D
Canva, Blender
AI
Effective use of AI models such as Claude, Gemini and GPT in development
Programming languages
C, C#, Java, Python
Fundamentals
Data structures and algorithms, object-oriented programming, systems analysis, computer networks, operating systems
Game engines
Godot; basic knowledge of Unity and Unreal Engine
Hardware
Arduino, IoT, sensors
Languages
Turkish (native), German (B1 course), English (basic)

Contact

Ismet Kalayci

Let's talk.

E-Mail
ismetkalaycitr@gmail.com
LinkedIn
linkedin.com/in/ismetkalayci
Location
NRW, Germany