UJJWAL BALAJI

@ujjwal1805

Learning | Exploring | Currently working in Genpact as Lead Associate- EUC

Delhi, IndiaJoined January 2025

About

I'm a 2024 Computer Science Undergrad from SRM University, Sonepat, Delhi-NCR, specialising in AI & Data Science. Currently working at Genpact as a Lead Associate – EUC, and passionately learning AI, NLP, and ML, while building full stack projects to sharpen my skills. I enjoy reading and writing tech blogs and stay driven by a constant curiosity for all things tech.

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UJJWAL BALAJI's blogs

System Design Architectureujjwal18.hashnode.dev8 posts

Chatter about AIchatteronai.hashnode.dev5 posts

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Recently published

UBUJJWAL BALAJIchatteronai.hashnode.devJun 2 · 8 min read

Inside the Brain of an LLM: From Raw Text to Next-Token Magic

Imagine you are sitting in a dimly lit café, watching a master chess player. They aren't looking at the whole board with panic; they are looking at the current setup, calculating the absolute best nex

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UBUJJWAL BALAJIchatteronai.hashnode.devMar 29 · 7 min read

Scaling PostgreSQL to 800 Million Users: OpenAI’s Surprisingly Simple Secret

Scaling PostgreSQL to 800 Million Users: OpenAI's Surprisingly Simple Secret Spoiler alert: It's just one primary database and 50 read replicas. That's it. When you hear that OpenAI serves over 800 mi

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UBUJJWAL BALAJIujjwal18.hashnode.devDec 22, 2025 · 4 min read

How Amazon Used Keyboard Latency to Uncover a North Korean IT Imposter

Imagine logging into your corporate workstation, typing away at your daily tasks, completely unaware that each keystroke carries a hidden signature—a geographical fingerprint embedded in the milliseconds between keypress and system acknowledgment. Th...

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UBUJJWAL BALAJIchatteronai.hashnode.devSep 6, 2025 · 5 min read

Building a Complete RAG Pipeline from Scratch: Data Ingestion to Retrieval

Introduction to RAG and Why It Matters Retrieval-Augmented Generation (RAG) has revolutionised how we interact with large language models by combining the power of information retrieval with generative AI. In this comprehensive guide, we'll build a c...

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UBUJJWAL BALAJIujjwal18.hashnode.devAug 1, 2025 · 4 min read

How Inverted Indexes Power Every Search Engine You Use

If you've ever wondered how search engines like Google, Elastic-search, or even the search feature in your favourite app work so fast, the answer lies in a fundamental data structure called the inverted index. In this post, We'll break down: What in...

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UJJWAL BALAJI

About

Available for

UJJWAL BALAJI's blogs

Recently published

Inside the Brain of an LLM: From Raw Text to Next-Token Magic

Scaling PostgreSQL to 800 Million Users: OpenAI’s Surprisingly Simple Secret

How Amazon Used Keyboard Latency to Uncover a North Korean IT Imposter

Building a Complete RAG Pipeline from Scratch: Data Ingestion to Retrieval

How Inverted Indexes Power Every Search Engine You Use

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UJJWAL BALAJI

About

Available for

UJJWAL BALAJI's blogs

Recently published

Inside the Brain of an LLM: From Raw Text to Next-Token Magic

Scaling PostgreSQL to 800 Million Users: OpenAI’s Surprisingly Simple Secret

How Amazon Used Keyboard Latency to Uncover a North Korean IT Imposter

Building a Complete RAG Pipeline from Scratch: Data Ingestion to Retrieval

How Inverted Indexes Power Every Search Engine You Use