# SERGEN KABAKCI — Comprehensive Technical Profile & Portfolio

> Senior Software Engineer & Full Stack Developer with 8+ years of professional experience building scalable web applications, multi-tenant SaaS platforms, mobile apps, and telecommunications infrastructure.

---

## Developer Overview

- **Full Name:** Sergen Kabakçı
- **Professional Title:** Senior Software Engineer / Full Stack Developer
- **Location:** İzmir, Turkey
- **Email:** sergen.kabakci@gmail.com
- **Website:** https://sergenkabakci.com/
- **Portfolio Mirror:** https://portfolio.sergenkabakci.com/
- **GitHub:** https://github.com/sergenkabakci
- **LinkedIn:** https://www.linkedin.com/in/sergenkabakci/
- **CV / Resume:** https://sergenkabakci.com/cv.pdf

---

## Professional Biography

Sergen Kabakçı is a Full Stack Software Engineer with over 8 years of hands-on experience architecting and delivering enterprise-grade web, mobile, and telecommunication solutions.

He began his engineering career in the telecommunications industry, gaining specialized expertise in VoIP protocols, SIP signaling, FreeSWITCH, IVR systems, and high-throughput real-time billing engines. Since 2023, Sergen has worked independently as a freelance software engineer and consultant, delivering bespoke digital platforms, mobile applications, and multi-tenant SaaS products for startups and established businesses.

His engineering philosophy emphasizes clean, maintainable architecture, robust API design, comprehensive database normalization, scalable cloud deployments, and user-centric frontend experiences.

---

## Core Technical Skills

### Backend Development
- **PHP:** PHP 7.x / 8.x, Object-Oriented Programming, MVC architecture, Composer, PSR standards.
- **Frameworks:** Laravel (Eloquent ORM, Queues, Events, Notifications, Sanctum/Passport, Blade), CodeIgniter.
- **Node.js:** Express.js, REST APIs, asynchronous programming, WebSockets.
- **Architecture:** Microservices, Multi-Tenant SaaS, RESTful API design, Event-Driven Architecture, Service-Oriented Architecture (SOA).

### Frontend Development
- **JavaScript & TypeScript:** ES6+, Modern JS frameworks, TypeScript typing.
- **Frameworks & UI:** React.js, Context API, Hooks, Redux, Bootstrap 5, Tailwind CSS, HTML5, CSS3/SASS.
- **UI/UX Design:** macOS-inspired desktop interfaces, glassmorphism, responsive mobile-first layouts, performance optimization.

### Mobile Development
- **Cross-Platform:** React Native, Expo CLI, React Navigation.
- **Deployment:** Android (Google Play Console, APK/AAB builds), iOS (App Store Connect, TestFlight).
- **Features:** Push notifications, barcode/QR scanning, camera integration, offline caching, in-app purchases.

### Telecommunications & VoIP
- **VoIP Protocols:** SIP, RTP, WebRTC.
- **PBX & Switching:** FreeSWITCH, Asterisk, Softswitches, Multi-Tenant Virtual PBX.
- **Messaging:** SMS Gateways, SMPP, REST SMS APIs, bulk campaign distribution engines.
- **Voice Features:** Dynamic IVR call flows, extension routing, call recording, CDR analysis, billing and rating engines.

### Databases & Storage
- **Relational Databases:** MySQL, MariaDB, PostgreSQL (complex queries, indexing, partitioning, transaction management).
- **In-Memory & Cache:** Redis (caching, queue workers, pub/sub), Memcached.
- **NoSQL:** MongoDB, JSON data stores.

### DevOps, Cloud & Infrastructure
- **Containerization:** Docker, Docker Compose, containerized multi-service stacks.
- **Cloud Platforms:** Amazon Web Services (AWS EC2, S3, RDS, CloudFront, Route 53), DigitalOcean, Linux VPS.
- **Web Servers:** Apache HTTP Server (.htaccess rewrite rules, mod_deflate, mod_expires, security headers), Nginx (reverse proxy, SSL termination).
- **Version Control & CI/CD:** Git, GitHub, GitLab CI/CD, automated build and deployment pipelines.

---

## Detailed Project Portfolio

### 1. Mamabüs — Corporate Catering Web Platform
- **URL:** https://mamabus.com.tr/
- **Category:** Business / Food & Catering Platform
- **Year:** 2026
- **Stack:** PHP, Laravel, MySQL, Bootstrap, JavaScript
- **Description:** A modern corporate catering website engineered to present corporate catering services, dynamic menu catalogs, blog articles, and seamless corporate quotation inquiry forms.

### 2. Sanal PBX (Velith) — Cloud VoIP & Virtual PBX Platform
- **URL:** https://www.sanalpbx.com/
- **Category:** Telecommunications / SaaS Application
- **Year:** 2026
- **Stack:** Laravel, FreeSWITCH, PostgreSQL, Redis, Vue/React, WebSockets
- **Description:** A scalable multi-tenant SaaS Private Branch Exchange platform managing enterprise cloud VoIP communications. Features comprehensive extension provisioning, IVR tree configuration, call recording, ring groups, detailed CDR reporting, and tenant isolation.

### 3. LIMS — Laboratory Information Management System
- **URL:** https://lims.velith.com/
- **Category:** HealthTech / Enterprise Web Platform
- **Year:** 2026
- **Stack:** Laravel, MySQL, React, RESTful API, Docker
- **Description:** An enterprise Laboratory Information Management System built to digitize end-to-end lab workflows. Features patient and sample registration, barcoding, test and culture workflows, diagnostic report generation, billing/invoicing, inventory management, and fine-grained role-based access control.

### 4. WHMCS Mobile — Hosting & Client Management Mobile App
- **Category:** Business / Mobile Application (iOS & Android)
- **Year:** 2026
- **Stack:** React Native, Expo, WHMCS REST API, Redux
- **Description:** A mobile application enabling web hosting company administrators to monitor and manage their WHMCS installations on the go. Provides real-time notifications for client tickets, automated invoice status tracking, order approvals, and server health checks.

### 5. Midfest — Nature Camping Festival Platform
- **URL:** https://midtermcampfest.com
- **Category:** Event & Festival Platform
- **Year:** 2026
- **Stack:** PHP, JavaScript, CSS3, Bootstrap
- **Description:** The official digital platform for Turkey's premier family nature and camping festival. Handles event announcements, workshop schedules, camping guide information, and attendee communications.

### 6. Duckcoffee Mobile — Customer Loyalty & Ordering App
- **Category:** Mobile Application (iOS & Android)
- **Year:** 2025
- **Stack:** React Native, Node.js API, PostgreSQL
- **Description:** Fast customer loyalty and drink ordering app for coffee enthusiasts. Features QR-code loyalty stamping, personalized campaign promotions, branch locators, and digital menu browsing.

### 7. Duckcoffee Web — Brand & Operations Platform
- **Category:** Business Web Platform
- **Year:** 2025
- **Stack:** PHP, Bootstrap, JavaScript, SEO Optimization
- **Description:** Digital presence and store operations platform for coffee shop chain management, product showcase, and franchise inquiries.

### 8. Obi Mobile — Actor Casting & Showreel Application
- **Category:** Entertainment / Mobile Application (iOS & Android)
- **Year:** 2025
- **Stack:** React Native, Expo, REST API, Cloud Video Storage
- **Description:** Talent casting mobile platform allowing actors to build digital portfolios, upload showreels and self-tapes, receive audition calls, and track casting application progress in real time.

### 9. Obi Web — Casting Agency & Production Management Portal
- **URL:** https://odi.sergenkabakci.com/admin/
- **Category:** Entertainment / Web Management Platform
- **Year:** 2025
- **Stack:** Laravel, MySQL, Bootstrap, JavaScript
- **Description:** Enterprise management platform for casting directors and production teams to publish audition notices, filter actor submissions, review audition tapes, and manage casting workflows.

### 10. Checkmate — Product Ingredient Analysis App
- **URL (Android):** https://play.google.com/store/apps/details?id=com.fmo.checkmate
- **URL (iOS):** https://apps.apple.com/tr/app/checkmate/id6746459865?l=tr
- **Category:** Health & Lifestyle / Mobile Application
- **Year:** 2025
- **Stack:** React Native, Expo, Food/Cosmetics Ingredient Database API
- **Description:** Mobile scanner app that analyzes barcode and ingredient lists in seconds, presenting clear, transparent information regarding allergens, additives, and safety ratings.

### 11. Sanal PBX (CDMA) — Virtual PBX Platform
- **URL:** https://sanalpbx.cdma.net.tr/
- **Category:** Telecommunications / SaaS Platform
- **Year:** 2025
- **Stack:** Laravel, FreeSWITCH, MySQL
- **Description:** SaaS virtual PBX platform enabling small-to-medium businesses to subscribe, configure extensions, route inbound calls, and manage VoIP communications with zero on-premise hardware.

### 12. Peer — Service Reservation System
- **URL:** https://peer.velith.com/
- **Category:** Business & E-Commerce Web Platform
- **Year:** 2025
- **Stack:** Laravel, MySQL, Payment Gateway Integration (Iyzico / Stripe)
- **Description:** Online appointment and service booking platform with real-time calendar availability, automated payment processing, and SMS/email notifications.

### 13. Müze App — Museum Touchscreen Web Application
- **URL:** https://muze.cdma.net.tr/
- **Category:** Multimedia & Exhibition Application
- **Year:** 2025
- **Stack:** HTML5, CSS3, JavaScript, Interactive Touch UI
- **Description:** Touchscreen kiosk software built for museum visitors to explore multimedia artifact catalogs, historical timelines, and interactive exhibits.

### 14. Bobajoy Mobile — Staff Training & Operations App
- **Category:** Internal Enterprise Mobile App
- **Year:** 2024
- **Stack:** React Native, Node.js Backend, MySQL
- **Description:** Internal operations mobile application for bubble tea chain staff featuring interactive training modules, digital standardized beverage recipes, inventory restocking requests, and staff performance metrics.

### 15. Asaki Mobile — Property & Vehicle Marketplace App
- **URL:** https://play.google.com/store/apps/details?id=com.arsadenizi.Asakitr
- **Category:** Marketplace / Mobile Application
- **Year:** 2024
- **Stack:** React Native, Android, Laravel Backend API
- **Description:** Property, real estate, and vehicle rental/sales marketplace app featuring location filtering, photo galleries, and direct in-app messaging.

### 16. Asaki Web — Property & Asset Marketplace Platform
- **URL:** https://asaki.com.tr
- **Category:** Marketplace / Web Platform
- **Year:** 2024
- **Stack:** Laravel, MySQL, Bootstrap, JavaScript
- **Description:** Responsive marketplace web platform for residential and commercial real estate, vehicles, and personal asset listings.

### 17. Telecom CRM — Billing & Switch Management
- **Category:** Enterprise Telecommunications CRM
- **Year:** 2023
- **Stack:** PHP, CodeIgniter/Laravel, MySQL, Softswitch APIs
- **Description:** Telecom back-office CRM handling enterprise customer billing, CDR rating, DID number allocation, VoIP switch integration, and balance management.

### 18. SMS Panel — Bulk Messaging & Campaign Platform
- **URL:** https://sms.sergenkabakci.com
- **Category:** Enterprise Messaging / SaaS Platform
- **Year:** 2023
- **Stack:** Laravel, React, MySQL, Redis Queues, SMS Gateways
- **Description:** High-throughput bulk SMS platform capable of dispatching millions of messages with real-time delivery status reports, contact group management, scheduled campaigns, and developer REST APIs.

### 19. VOIP CRM Panel — Voice Operations Platform
- **URL:** https://sucrm.sergenkabakci.com
- **Category:** Telecommunications / Cloud Voice Platform
- **Year:** 2022
- **Stack:** PHP, MySQL, FreeSWITCH, SIP Trunks
- **Description:** Cloud VoIP operations panel providing tenant administration, call routing rules, SIP trunk monitoring, and voice communication logs.

---

## Contact & Hiring

Sergen Kabakçı is available for freelance projects, technical consulting, and senior engineering roles.

- **Email:** sergen.kabakci@gmail.com
- **LinkedIn:** https://www.linkedin.com/in/sergenkabakci/
- **GitHub:** https://github.com/sergenkabakci
- **Official Website:** https://sergenkabakci.com/