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Blueprints · The Library

Every Book I've Written.Knowledge That Outlasts Any Technology Cycle.

Twenty years of learning, building, and thinking — distilled into books that respect your time and intelligence.

Each title here started as a gap I personally encountered — a question nobody had answered well, a concept explained poorly everywhere else, or a skill the industry pretended was simple when it wasn't. These are not content-marketing PDFs. They are books.

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8
Books Published

Across software, business, science & philosophy.

1,200
Readers Worldwide

Developers, founders, students, and engineers.

4
Free Titles

Because not everything worth knowing should cost money.

4.9
Avg. Reader Rating

Verified reader reviews across all titles.

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The Library · All Titles

CATALOGUE_LOADED // 8_BOOKS · TECH · PHILOSOPHY · BUSINESS

Every Book I've Written.

8 titles
01 Free

100 Future Skills Everyone Must Understand

A Forward-Looking Guide for Engineers & Builders

Debasis Bhattacharjee
Free Career & Growth
100 Future Skills Everyone Must Understand

The map of skills that will separate the builders from the observers in the next decade.

Covering technical mastery, AI collaboration, systems thinking, and human adaptability — this is the guide nobody handed you at graduation. Not trends. Not tools. The underlying capabilities that outlast every technology cycle.

Pages
210
Format
PDF + ePub
Price
Free
Published
2024
Download Free → Preview First Chapter
02 Free

How to Build a Time Machine

Theoretical Physics Made Approachable

Debasis Bhattacharjee
Free Science
How to Build a Time Machine

One of humanity's oldest obsessions — finally explained without the impenetrable mathematics.

From special relativity to wormholes to the hard philosophical questions surrounding causality — this 185-page exploration takes you to the edge of what physics actually permits. Written for the curious mind, not the specialist.

Pages
185
Format
PDF
Price
Free
Published
2023
Download Free → Preview First Chapter
03 $7

The Affiliate Marketplace Decoded

High-Converting Funnels — Unpacked & Annotated

Debasis Bhattacharjee
$7 Business
The Affiliate Marketplace Decoded

The algorithmic anatomy of high-converting affiliate funnels — not theory, but mechanics.

Not another "passive income" fantasy. This is a cold, technical breakdown of what actually makes affiliate systems work — traffic logic, funnel math, offer matching, and the conversion psychology nobody talks about openly.

Pages
160
Format
PDF
Price
$7
Published
2023
Get the Book → Preview First Chapter
04 Free

The Developer's Interview Playbook

Real Questions. Annotated Answers.

Debasis Bhattacharjee
Free Software
The Developer's Interview Playbook

The questions they actually ask. The answers that actually land. From someone who has sat on both sides of the table.

250+ real interview questions across frontend, backend, databases, system design, and behavioural rounds — with annotated answers, not just model responses. Written from 20 years of hiring and being hired.

Pages
230
Format
PDF + ePub
Price
Free
Published
2024
Download Free → Preview First Chapter
05 $12

Building with Claude: A Practitioner's Field Guide

From API Calls to Production Agentic Systems

Debasis Bhattacharjee
$12 AI & Software
Building with Claude: A Practitioner's Field Guide

The book that turns Claude from a chatbot into an engineering collaborator.

Covers prompt architecture, MCP implementation, context management, multi-turn flows, and the lessons from 50+ real projects built on top of Claude's API. Not documentation — experience.

Pages
195
Format
PDF
Price
$12
Published
2025
Get the Book → Preview First Chapter
06 Free

Clean Code, Real World

50 Patterns That Survive Production

Debasis Bhattacharjee
Free Software
Clean Code, Real World: 50 Patterns That Survive Production

The gap between textbook code and code that survives five years in the wild — bridged.

Not a refactoring manifesto. A practitioner's notebook of 50 patterns observed across hundreds of real systems — what holds, what breaks, and why the difference matters at 3am when the server goes down.

Pages
148
Format
PDF
Price
Free
Published
2024
Download Free → Preview First Chapter
07 $9

SaaS Architecture for One

Building a Profitable Product Solo

Debasis Bhattacharjee
$9 Business
SaaS Architecture for One: Building a Profitable Product Solo

Everything a solo developer needs to know before — and after — writing the first line of a SaaS product.

Pricing psychology, infrastructure decisions, launch sequencing, churn prevention, and the honest financial math behind building a software business without a team or a VC cheque.

Pages
175
Format
PDF + ePub
Price
$9
Published
2024
Get the Book → Preview First Chapter
08 Free

The Mathematical Universe

A Layperson's Tour

Debasis Bhattacharjee
Free Science
The Mathematical Universe: A Layperson's Tour

For the engineer who always suspected that mathematics was not describing reality — but that mathematics was reality.

From Euclidean geometry to the implications of Max Tegmark's Mathematical Universe Hypothesis — a rigorous but readable exploration of why numbers rule everything, including us.

Pages
165
Format
PDF
Price
Free
Published
2023
Download Free → Preview First Chapter
The Philosophy

"A lamp does not lose its light by lighting another lamp. Knowledge shared is not knowledge diminished — it is knowledge multiplied."

— Debasis Bhattacharjee

Be First in Line for
Every New Release.

I publish one to two books per year. Each one takes months. When a new title drops, subscribers get it before anyone else — and free titles go to the list before they go anywhere else.

Early access to all new books Free PDFs before public launch No spam, ever. One-click unsubscribe. Occasional insights from 20 years in the field
Reader Voices

REVIEWS_VERIFIED // READER_RATING: 4.9 · COMMUNITY_FEEDBACK

What Readers Are Saying.

"The Future Skills book changed how I think about my own career trajectory. I went from reactive — chasing whatever skill was trending — to proactive. Built a 3-year learning plan from a single weekend with this book."

Software Developer · Bangalore

"I've read a lot of physics popularisations. The Time Machine book is genuinely different — it doesn't oversimplify. It respects the reader's intelligence while still being completely approachable. Finished it in a single evening."

Engineering Student · Chennai

"The Affiliate book is the first one I've read on the topic that actually explains the mechanics rather than just the outcomes. The funnel logic section alone was worth ten times the $7 price tag."

Digital Marketer · Germany

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