# Javohir Sadullayev — Software Engineer & .NET Backend Developer
> Official llms.txt reference for LLM agents, web crawlers and search engines.
> Website: https://javohir.engineer (javohir.engineer)

## Identity & Aliases
- Full Name: Javohir Sadullayev (Javohirbek Sadullayev)
- Known As: Javohir Sadullayev, Sadullayev Javohir, javohir engineer, javohir.engineer, Javohir, Sadullayev
- Profession: Software Engineer, .NET Backend Developer, AI Product Builder
- Location: Tashkent, Uzbekistan
- Education: PDP University — B.Sc. in Computer Science (2024–2028, GPA: 4.13 / 4.5)

## Quick Summary
Javohir Sadullayev is a backend software engineer specializing in high-concurrency systems, event-driven architectures, and AI product integration using C# and .NET 8. He builds production-grade REST APIs, real-time WebSocket applications with SignalR, high-speed PostgreSQL and Redis data layers, and speech assessment models powered by Azure Cognitive Services.

## Core Technical Stack
- Languages: C# (C# 12), .NET 8, SQL, TypeScript, Bash
- Backend: ASP.NET Core Web API, Entity Framework Core, Dapper, Clean Architecture, CQRS, MediatR
- Real-time & Caching: Redis (In-memory Caching, Distributed Locks, Pub/Sub), SignalR Core, WebSockets (<50ms latency)
- Databases: PostgreSQL (Query Optimization, Indexing, Cursor Pagination), MS SQL Server
- DevOps & Cloud: Docker, Docker Compose, Linux/Bash, Git, GitHub Actions CI/CD
- AI & Cognitive: Azure Speech (STT, TTS, Pronunciation Assessment), OpenAI / LLM APIs, Vector Embeddings
- Testing: xUnit, Integration Testing, Unit Testing (105+ automated tests)

## Key Projects
1. **EnglishAI**: Adaptive English learning platform with real-time speech assessment and pronunciation scoring. Built with ASP.NET Core, Azure Speech, Redis, and SignalR. Served 700+ active learners with <120ms speech latency and +78% onboarding completion.
2. **KitobdagiMen** (kitobdagimen.uz): Social book reading platform with Telegram Mini App auth, algorithmic discovery feed, and live quotes. Feed latency <45ms, 99.4% auth success rate.
3. **TypingWar**: Multiplayer real-time typing duel engine with sub-50ms synchronization, anti-cheat validation, and live matchmaking using SignalR and Redis Pub/Sub.
4. **ZiyoAI**: AI-driven educational platform with automated homework grading, multi-turn student tutoring, and OCR visual comprehension.
5. **MeningVaqtim**: High-performance productivity and focus tracker with habit analytics and offline synchronization.

## Verified Credentials & Certifications
- HackerRank Software Engineer Certificate
- HackerRank REST API (Intermediate) Certificate
- Microsoft & freeCodeCamp: Foundational C# Certificate

## Contact & Official Channels
- Telegram: https://t.me/dotnetda (@dotnetda)
- Email: javohirsadullayev836@gmail.com
- Phone: +998 88 603 66 44
- LinkedIn: https://www.linkedin.com/in/javohir-sadullayev-b8737725a/
- GitHub: https://github.com/Sadullayev-Javohir
- Portfolio: https://javohir.engineer

## Full Documentation & Context
For comprehensive details, architectural decisions, and detailed case studies, read the full documentation at:
- https://javohir.engineer/llms-full.txt