SOLID Design Principle
A quick reference to the five SOLID principles of object-oriented design, with what each one means in practice.
Hi, I'm Raj
Notes from the data pipeline.
I write, build and talk about data platforms: streaming, lakehouses, cloud migrations, and leading the teams who run them. Fifteen years in, still learning out loud.
// latest writing
From the blog
Everything You Need to Know About Medallion Architecture
How the bronze, silver and gold layers organise data in a lakehouse, and why the pattern improves quality step by step.
What should be the strategy for migrating Data Lake infrastructure from one cloud platform to another?
A phased plan for moving a data lake between cloud providers while keeping disruption low and data intact.
Software development methodologies
An overview of the common ways to plan and run software projects, from Waterfall to Agile and beyond.
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What I write about
// publications
My book
book · BPB Publications · 2026
Hello Modern Data Pipelines
A practical guide to designing and operating modern data pipelines
An end-to-end roadmap for building production data pipelines: from ETL/ELT basics and pipeline design patterns to ingestion, transformation, storage, data quality, governance, real-time processing, orchestration and monitoring. Written for software, data and platform engineers, and for anyone moving into data engineering.
// open source
Things I'm building
build_projects · running
Open-source projects are on the way
Small, practical tools from running data platforms. Follow me on GitHub to see them first.
// on youtube
Latest videos
record_videos · running
Videos are coming soon
Walkthroughs, explainers and talks on data platforms are being recorded.
Engineering manager by day, data nerd always.
I lead the Data & Analytics Platform team at Calix, I'm working on a PhD at IIT Patna, and I wrote Hello Modern Data Pipelines. Read the short version of the journey, or say hello on LinkedIn.