Building reliable systems
and modern web applications.

PROBLEM

Many clients, multiple rooms, shared state and connections that can disappear at any time. Real-time communication requires concurrency, presence and connection lifecycle to be handled as part of the system design.

APPROACH

Built a multi-room chat server in Go using goroutines and channels for client communication, mutex-protected room state, structured JSON messaging, presence and typing indicators, ping/pong keepalive and graceful shutdown. The React and TypeScript client consumes the server through WebSockets.

AI ASSISTANT

Integrated the NVIDIA NIM API with the Nemotron 3 Ultra 550B A55B model, allowing users to interact with an AI assistant directly from the chat using /ai commands.

ARCHITECTURE

React and TypeScript connect to the Go server through WebSockets. The backend separates connection handling, client read/write loops, room membership and broadcasting, and AI integration. Shared room state is protected with mutexes, while channels carry messages between connected clients.

PROBLEM

Multiple business services need to react to the same order without blocking each other — and without needing to know how the others work.

APPROACH

A distributed order-processing system built as independent services communicating through Apache Kafka. Workflows run asynchronously, with idempotent event handling, PostgreSQL for persistent state and Redis for fast-access data.

ARCHITECTURE

An event-driven workflow where the Order service publishes domain events through Kafka and independent consumers react to them asynchronously. Each service owns its responsibility and handles events idempotently, allowing new consumers to be added without changing the producing service.

PROBLEM

Operational numbers are only useful while they are still true. Polling either lags behind the business or hammers the database.

APPROACH

A Go backend that ingests through Kafka and streams high-frequency data over WebSockets into a React and TypeScript interface that updates in real time.