"Architecting high-performance, real-time web applications, custom compilers, and deterministic multiplayer game engines with clean code."

I'm Ali Haggag, a Software Engineer & CS Student focused on System Design, Performance Optimization, and Security Hardening. I specialize in building complex backends, custom language parsers, and low-latency real-time synchronization layers.

• 🤖 Logic Arena — Competitive Robot Battle Simulator v3.6.5

  • Compiler & Sandbox: Engineered AliScript v3 (Lexer → AST → sandboxed evaluator, no eval()) with a deterministic 2,000-ops/tick TLE quota — fair execution limits regardless of hardware.
  • Real-time Sync: 20 TPS server physics engine with client-side lerp interpolation to 60 FPS; delta diffing cuts WebSocket payload size by ~80%.
  • Tech Stack: Next.js 16, NestJS 11, React Three Fiber (Three.js), Socket.io, Redis, PostgreSQL, Prisma, Docker + Nginx, DigitalOcean.

• 🚀 Flurry Super App — Real-time Social Super App v2.0

  • Communication: WebRTC P2P audio/video via a custom Socket.io signaling server (<50ms latency).
  • Resilience: Offline-first PWA — IndexedDB action queue synced through Inngest durable functions and a Workbox service worker.
  • Tech Stack: WebRTC, Socket.io, Gemini AI, PWA, React, MongoDB, i18next.

• 🏗️ CS Arena Platform — Developer Ecosystem

  • State Engine: Resolved cascading UI filter race conditions using useTransition and a URL-first state engine on Next.js 16 Server Components.
  • Tech Stack: Next.js 16, Sanity CMS, NextAuth, Sentry, Resend, Framer Motion.

A few real production issues I've diagnosed and fixed — documented in full on my portfolio.

• The Ghost Match Massacre (Logic Arena, WebSocket/NestJS) — Disconnected players' matches kept running server-side, pinning CPU at 100%. Fixed by tying match lifecycle to live client count.
• Operator Precedence Disaster (AliScript compiler) — 2 + 3 * 4 evaluated to 20. The expression parser had no precedence tower. Fixed by splitting addition/multiplication into separate parse levels.
• Deterministic TLE Quota (Sandboxing) — Wall-clock execution limits made the same script pass on one machine and fail on another. Replaced with a platform-agnostic ops-per-tick counter.

• Systems Design: Domain-Driven Design (DDD), Microservices, Anti-Corruption Layers (Zod), and Enterprise Security pipelines.
• Real-time Protocols: WebSocket event handling, WebRTC signaling, and client-side interpolation buffers.
• Performance Optimization: CPU profiling, database pagination query constraints, and asset bundle pruning.

🛠️ Technical Arsenal

Category	Technologies
Frontend
Backend
Compiler & Systems
Data & ORM Layer
Real-time & AI
Auth & Security
DevOps & Infra
CMS & State
Monitoring
Design & UI
CS & Tools

🏆 GitHub Trophies

📊 GitHub Stats

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🚀 Building deterministic systems where performance, correctness, and maintainability come first.