Writing

Building a Local RAG Knowledge Manager with Ollama and Qdrant

How I put together a local document Q&A application with Streamlit, Ollama, Qdrant and SQLite, and what I learned about vector points and storage.

Understanding Base64 Encoding: Why We Use It, How It Works, and Trade-offs

A practical explanation of Base64 encoding, six-bit groups, padding, size overhead and Java support.

Demystifying Java Object References: Pass-by-Value Explained

Understand why Java passes object reference values by value, with a small runnable example.

Java Concurrency: Race Conditions, ConcurrentHashMap and CountDownLatch

Experiments with atomic conditional updates, thread coordination, happens-before and latch failure modes.

Debugging AWS Lambda OOM: Why In-Memory File Decryption Blew Up Our Python Runtime

A production debugging story about memory amplification while decrypting and parsing large Excel files in AWS Lambda.

Debugging OpenTelemetry in AWS Lambda: Fixing Broken Traces Across Worker Threads

How a worker-thread boundary broke OpenTelemetry trace parenting in an AWS Lambda pipeline, and how explicit context propagation fixed it.

My Tic-Tac-Toe Game in Java

A two-player console Tic-Tac-Toe game in Java, with input validation and a small playable browser preview.