Umut Derebek

What I focus on

• 01

  Enterprise web

  Internal platforms, REST APIs, SSO and multi-tenant SaaS with Laravel, .NET and Next.js.

  LaravelASP.NET CoreNext.js

• 02

  Mobile

  Offline-first apps on the App Store and Google Play with Expo / React Native.

  React NativeExpoFirebase

• 03

  AI & LLMs

  Multi-agent RAG, local model serving, DPO fine-tuning and OCR / vision pipelines.

  LangGraphOllamaQdrant

• 04

  DevOps & cloud

  Docker, Kubernetes, AWS and DigitalOcean — provisioning, CI/CD and running production.

  DockerKubernetesAWS

1. 09/2023 – Present

   Çankaya, Ankara

   Fullstack Developer

   SICPA Turkey

   Building enterprise web applications, internal platforms, cross-platform mobile apps and AI systems end to end.

   • Developed the corporate enterprise website with Laravel, Vue.js and Tailwind CSS, deployed via Docker & Kubernetes (YAML).
   • Built Exprova, a corporate expense-management platform (Laravel REST API, MySQL, RabbitMQ, React Native) with SAP accounting-code integration.
   • Built the RTU-MYS / MzTurnCounter museum visitor-counting & remote device-monitoring platform (ASP.NET Core 8, PostgreSQL on AWS RDS, Raspberry Pi edge agents).
   • Built a corporate AI chatbot with a multi-agent RAG pipeline, local LLM serving (Ollama) and a feedback-driven DPO fine-tuning pipeline.
   • Developed an inventory management system and an HR Flow SaaS platform (payroll & leave); implemented SSO with multi-tenancy.
   • Set up and administered IIS (Windows Server) to host .NET applications, and deployed Dockerized services on AWS EC2.
   • Provided end-user technical support and troubleshooting.

2. 12/2022 – 07/2023

   Çankaya, Ankara

   Laravel Full Stack Developer

   Inosas A.Ş.

   Developed the "Digital Graduate Yearbook" project while leased to Ankara Hacı Bayram University by Inosas.

   • Built the project with Laravel, Vue.js and Livewire, using a REST API architecture following MVC and OOP patterns.
   • Utilized MySQL for efficient data storage and applied Big Data techniques to handle large data volumes.
   • Worked in an Agile environment; participated in frontend/backend development, testing, debugging and code reviews.

3. 01/2022 – 07/2022

   Tashkent, Uzbekistan

   Senior Web Application Developer

   Ziraat Bank Uzbekistan

   • Developed C# applications and integrated them with the bank's infrastructure; led a small developer team.
   • Prepared and managed the Kubernetes environment, migrating applications for scalability and reliability.
   • Coordinated with the bank's IT team and stakeholders; optimized performance and participated in code reviews.

4. 12/2019 – 12/2021

   Çankaya, Ankara

   Laravel Fullstack Developer

   Invamed & RD Global

   • Built CMS and e-commerce infrastructure on PHP 8.0 + Laravel & Livewire (MVC).
   • Worked on a mobile application coded with Node.js & React Native; provided IT solutions support.

5. 01/2019 – 10/2019

   Çankaya, Ankara

   PHP Web Developer

   Firefly IT Company

   • Developed online psychology and informational websites with Laravel and modern web technologies.
   • Collaborated with the frontend team; completed coding, testing and version-control tasks on schedule.

6. 12/2017 – 01/2019

   Çankaya, Ankara

   Fullstack Web Developer

   Önal & Önal Law Firm

   • Built an e-commerce platform (Laravel + Vue.js) increasing online sales revenue by 50%.
   • Designed a responsive UI (HTML/CSS/JS) increasing traffic and engagement by 20%; built a custom CMS reducing maintenance by 30%.