Hi, I'm Dinesh.
Sai Dinesh Reddy Maluchuru · Hyderabad, India
I'm a Data & ML Engineer at Microsoft, working on OneNote Copilot and the OneDrive/SharePoint platform. This is my personal blog — the place where I think out loud about the systems I build and the ones I admire.
What I work on
By day, I help run telemetry and evaluation pipelines that touch 200+ TB of logs and 300B+ transactions every day. I built an LLM-as-a-Judge evaluation framework for OneNote Copilot's video features, migrated several Oracle workloads to Spark, and have spent more time than I'd like to admit chasing 70% cost reductions on petabyte-scale jobs.
Before Microsoft I was a Data Engineer at Amazon (2019–2022), and before that an Associate at JPMorgan Chase (2017–2019). I did my Dual Degree (B.Tech + M.Tech) in Electrical Engineering at IIT Madras from 2012 to 2017.
Why this blog exists
Most of what I read about data and AI engineering online is either thin marketing or dense academic. I wanted a place to write the things I wish someone had handed me earlier: the messy middle — what actually breaks at 3 AM, why a "simple" RAG system needs six iterations before it stops hallucinating, what a 70% cost cut on a query engine really involves.
I publish slowly. Usually one or two essays a month, sometimes none. I try to write only when I have something I'd want to read myself.
What you'll find here
- Data engineering at scale — Spark internals, lakehouse design, query engines, the unglamorous plumbing
- AI & LLM systems — RAG, evaluation, prompt engineering, what works in production vs. demos
- Distributed systems — consensus, storage, networking, the parts most posts skip
- Honest reflections — bills, postmortems, second-system effects, things I got wrong
Outside work
I got married to Anusha on June 8, 2025 — we're now planning a small AI / robotics startup together (more on that some day, on this blog). I read more than I write, mostly long essays and the occasional textbook. Hyderabad is home.
Stay in touch
The best way to follow new essays is the free newsletter — one email per post, no spam, unsubscribe with one click. There's also an RSS feed if you prefer that. For anything else, the contact page has my email.
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