🌐 Portfolio: https://o1-spec.vercel.app/ 📧 Email: oluwafemionadokun@gmail.com 💼 LinkedIn: https://linkedin.com/in/oluwafemi-onadokun 🐦 Twitter/X: https://twitter.com/Oluwafemi166 🧩 LeetCode: https://leetcode.com/u/femi19/

I build scalable web applications, backend systems, realtime infrastructure, and mobile applications.

My current focus is on:

• distributed systems
• backend architecture
• realtime communication systems
• scalable APIs
• system design
• AI-powered applications

I enjoy understanding how real-world systems are designed, the trade-offs behind them, and how to build reliable software that scales.

A distributed realtime chat application built with:

• Node.js
• Express
• Socket.IO
• Redis Adapter
• PostgreSQL
• JWT Authentication

• Realtime messaging
• Distributed websocket scaling
• Redis pub/sub synchronization
• Sticky session architecture
• Idempotent message delivery
• Persistent chat storage

🔗 Repository: https://github.com/o1-spec/SocketChat

A distributed file processing pipeline designed for scalable asynchronous processing.

• Node.js
• BullMQ
• Redis
• PostgreSQL
• MinIO (S3-compatible object storage)

• Queue-based file processing
• Worker architecture
• Retry & failure handling
• Presigned uploads
• Processing status tracking
• Scalable backend design

🔗 Repository: https://github.com/o1-spec/File-flow

An AI-assisted pneumonia detection platform focused on improving healthcare accessibility through mobile-first diagnostic workflows.

• Mobile Client: React Native (Expo)
• Backend API: NestJS
• Database: PostgreSQL
• AI Service: Flask (planned integration)

• X-ray upload & analysis
• Authentication & authorization
• Scan history tracking
• AI prediction workflow
• Mobile-first healthcare experience
• Backend API architecture with NestJS

📱 Mobile App: https://github.com/o1-spec/PneumoDetect ⚙️ Backend API: https://github.com/o1-spec/PneumoDetect-Backend

I actively study and build backend systems to deepen my understanding of:

• scalability
• reliability
• system trade-offs
• distributed architectures
• realtime infrastructure
• queue-based processing systems

Currently documenting and designing systems such as:

• chat applications
• file processing systems
• URL shorteners
• streaming platforms
• API gateways

I build cross-platform mobile applications using React Native and Expo, focusing on:

• performance
• scalable architecture
• clean UI/UX
• secure authentication flows
• API integration
• responsive mobile experiences

I actively practice Data Structures & Algorithms using JavaScript and Python to strengthen problem-solving and technical interview skills.

Topics I focus on include:

• recursion & backtracking
• graphs & trees
• dynamic programming
• sliding window
• greedy algorithms
• system design fundamentals

🔗 LeetCode: https://leetcode.com/u/femi19/

I’m open to collaborating on:

• open-source projects
• backend systems
• scalable web applications
• realtime infrastructure
• AI-powered applications
• interesting engineering ideas with real-world impact

Kaizoku ni ore wa naru 🏴‍☠️ (If you know, you know.)

⭐️ Always building. Always improving.