Hasan Metehan Bacı

Career Profile

Full Stack Developer with 7+ years across frontend, backend and embedded systems. Built fintech backoffice and merchant platforms on React, NestJS and GraphQL, and shipped AI-powered cross-platform apps. The work I'm proudest of is a real-time live-fire training simulator for the defense sector that resolves 5 concurrent shooters hitting the exact same target point at 60 Hz, a problem most commercial simulators can't solve even for 2. It runs on 240 FPS IR cameras with C++17 tracking, Qt and Next.js operator tooling, and ESP32/FreeRTOS edge devices.

I work best where hardware meets software, and I care about shipping systems that actually run in production, not demos.

Career Journey

Full Stack Developer07/2025 – Present

Defense & Simulation

Built a real-time live-fire training simulator for defense and law enforcement, supporting up to 5 concurrent shooters engaging multiple targets with real pistols and rifles.
Wrote a high-performance C++17 tracking engine on 240 FPS IR cameras with OpenCV. It delivers sub-20 ms shot detection, automated camera calibration and polygon-based hit-zone scoring.
Designed a multithreaded, TDMA-based hardware sync protocol between 240 FPS IR cameras and weapon lasers that differentiates 5 concurrent shooters at 60 Hz, even when they hit the exact same target point.
Built a sub-frame reliability layer: 60 Hz dead-reckoning broadcast with screen-space velocity prediction, phantom-shot rejection, clock-drift compensation and multi-layer laser-ID disambiguation. Keeps tracking stable under concurrent live-fire.
Designed custom ESP32/FreeRTOS IoT firmware for field-deployed sensor devices, with IMU-based shot detection (SPI/I2C), wireless time sync and OTA updates.
Shipped a full-stack platform: a Qt desktop operator launcher, a Next.js analytics dashboard and real-time hardware orchestration over WebSocket + TCP/UDP. It drives session management, telemetry and remote ESP32 configuration.

C++ (C++17)MultithreadingTDMAOpenCVTCP/UDPWebSocketESP32FreeRTOSSPI/I2CIoT FirmwareCQtNext.jsReact.jsTypeScriptNode.jsUnitySystem Architecture

Frontend Developer01/2022 – 07/2025

Ozan Elektronik Para · Fintech

Spearheaded the development of a scalable enterprise Backoffice application utilizing React, TypeScript, and Micro Frontend architecture via Webpack Module Federation.
Engineered the Merchant Panel application from inception using React and Ant Design Pro, delivering a highly optimized UI/UX for core B2B business operations.
Architected and implemented Backend for Frontend (BFF) layers utilizing NestJS and GraphQL to orchestrate data flows and integrate frontend clients with internal microservices securely.
Established comprehensive UI component libraries using Storybook and Tailwind CSS, fostering reusability and accelerating cross-team development cycles.

React.jsTypeScriptTailwind CSSStorybookNestJSGraphQLMicro FrontendsWebpack Module FederationAnt Design Pro

Frontend Developer2020 – 2022

Freelance · Upwork & Fiverr

Delivered high-performance, responsive web applications and landing pages for diverse international clients, consistently meeting strict deadlines.
Engineered interactive Single Page Applications (SPAs) leveraging React.js, Next.js, and modern JavaScript ecosystem best practices.
Managed end-to-end SDLC encompassing requirements gathering, UI/UX translation, frontend implementation, optimization, and final deployment.

React.jsNext.jsJavaScript (ES6+)HTML5CSS3Web Performance

Frontend Developer & UI/UX Designer2017 – 2020

Artovy · Agency

Designed and developed custom e-commerce solutions and CMS-driven web applications tailored to diverse agency client specifications.
Produced comprehensive UI/UX designs, wireframes, and digital marketing assets utilizing Adobe Creative Cloud suite.
Administered web hosting infrastructures, databases (MySQL), and orchestrated end-to-end site deployment and maintenance protocols.

WordPressHTML5/CSS3MySQLUI/UX DesignAdobe PhotoshopAdobe IllustratorWeb Hosting

Personal Projects

Ferpz AI2025 – Present

AI-Powered Finance Tracker · Web & Mobile

Engineered cross-platform (Web & Mobile) AI-powered personal finance management application serving actionable budget insights.
Developed and integrated a conversational AI assistant leveraging OpenAI GPT-4o, creating 25+ custom tools for automated financial planning and analysis.
Constructed a unified backend architected with Next.js 14 and Prisma ORM, seamlessly serving a React Native (Expo) mobile client and web frontend.
Orchestrated full-stack features including secure authentication, RevenueCat subscription management, and real-time cross-device data synchronization.
Designed scalable data layer using PostgreSQL and deployed the full solution via Cloudflare Pages for global edge performance.

Next.jsReact NativeExpoOpenAIPrisma ORMPostgreSQLCloudflare PagesRevenueCat

Skills

Frontend & Mobile

JavaScript (ES6+)TypeScriptReact.jsNext.jsReact NativeExpoTailwind CSSHTML5CSS3StorybookAnt Design Pro

Backend & API

Node.jsNestJSGraphQLRESTful APIsPrisma ORMPostgreSQLOpenAI APIWebSocketTCP/UDP

Embedded & Simulation

C++ESP32IoT FirmwareOpenCVUnitySystem Architecture

DevOps & Tools

GitCI/CDCloudflare PagesEdge ComputingPostmanJiraMicro FrontendsRevenueCat

Education

Management Information Systems (BS)

Anadolu University

2021 – Present

Languages