Backend-first
FastAPI, .NET, SQL, and well-shaped APIs for multi-user systems.
Available for opportunities
Building reliable backend systems & full-stack products.
I'm Ahmet Hakan Demir — a Computer Engineering student at Gebze Technical University. I ship APIs, LLM-powered tools, and automation that solve real operational problems.
01 — About
Engineer who likes clean systems and practical automation.
I work across backend services, scraping pipelines, and LLM integrations — from ERP modules to inventory tools and chatbot backends. I care about modular architecture, solid data models, and shipping features that people can rely on day to day.
AI-aware
LangChain, RAG, multi-LLM setups, and performance-minded integrations.
Automation
Selenium bots, PDF parsing, and data workflows that remove manual grind.
02 — Experience
Where I've been building.
-
Full-stack Developer (Freelancer)
OPL-AI
- Built modules for a comprehensive ERP web app with .NET Razor Pages, focused on modularity and scale.
- Designed the core database schema for complex business workflows and HR modules.
-
Backend Development Intern
Metal Yapı
- Backend for an ERP management chatbot integrated with LLMs.
- API development, multi-LLM integration with LangChain, and RAG-based performance work.
- Security and performance: encryption, tokens, compression, and database management on FastAPI.
-
Web Scraper (Part-time)
Kitoko Aydınlatma ve İnşaat
- Collected product data from websites and PDFs into structured Excel datasets.
- Parsing, category separation, and numerical extraction at scale.
- Selenium bots for dynamic sites; automated multi-page navigation and collection.
-
Application Developer Intern
Ulus Metal
- Co-built ~50% of an inventory tracking system on .NET.
- WinForms + SQL app for tracking, assigning, and controlling inventory items.
03 — Projects
Selected builds.
React · .NET · Vite
DentalCare Clinic
Full-stack clinic management app — patients, appointments, diagnoses with an interactive FDI dental chart, multi-language UI (EN/TR), and role-based auth.
- React + TypeScript frontend with protected routes
- .NET API for patients, appointments, diagnoses & users
- Multi-language UI (EN/TR) and role-based access
Flutter
Word Game App
A progressive word game with a clean interface — players reveal letters for unknown words and advance through rounds.
- Simple, focused mobile UX
- Letter-reveal progression loop
Flutter
AnyTimer App
Time-tracking for freelancers with Pomodoro sessions and Excel reporting for billable hours.
- Billable hour tracking
- Automated Excel export for work logs
Professional work
ERP, chatbots & data pipelines
Across freelance and internship roles I shipped ERP modules, LLM chatbot backends, and long-running scraping pipelines — systems that connect messy real-world data to usable products.
- .NET ERP modules & database design
- FastAPI + LangChain multi-LLM chatbot
- Selenium/PDF data collection at volume
04 — Skills
Toolkit.
Languages
PythonC#CC++
Technologies
FastAPI.NETLangChainSQL
SeleniumBeautifulSoupWinFormsN8N
LLM integrationsWeb scraping
Concepts
Backend developmentAPI designRAG
Web automation
Spoken languages
Turkish — NativeEnglish — WorkingArabic — Intermediate
05 — Education
Academic path.
Sep 2021 – Present
B.Sc. Computer Engineering
Gebze Technical University · Kocaeli, Turkey
GPA 2.78 / 4.00
Sep 2016 – June 2021
Science Track
Beyoğlu Anatolian Imam Hatip High School · Istanbul, Turkey
GPA 90.84 / 100
06 — Contact
Let's build something solid.
Open to internships, freelance backend work, and full-stack product collaborations.
+90 547 025 12 23 · Gebze, Kocaeli, Turkey