Become the engineer who builds and audits on-chain systems, paid top rates, from anywhere

Web3 pairs a scarce skill with some of the biggest paychecks in engineering. Build and audit the on-chain systems behind a real product, and step in while few engineers can.

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BLOCKCHAIN Can you write a smart contract by copying examples, but not reason about what the chain actually does underneath? Step into web3, where scarce skills meet some of the highest pay in the industry.
  1. The agent wrote the contract; you decide if it ships
  2. Why 'confirmed' doesn't mean the money is yours
  3. A block you saw ten seconds ago just vanished
  4. What a signature actually proves, and what it doesn't
  5. Understanding a zero-knowledge proof without a math degree
  6. Where the bugs hide, one layer below Solidity
  7. Reading a contract the way an attacker will
  8. The six-line function that drained sixty million dollars
  9. It works in the demo and dies in production
  10. The upgrade that quietly corrupts every balance
  11. … and more
SOLIDITY You can write a contract that compiles, but can you see the path an attacker uses to drain it? Write the contracts that hold real money and survive. The skill protocols pay the most to get right.
  1. The contract that could not be patched
  2. There is no database. So where does the contract keep what it must remember?
  3. The same balance read four times, and every read is real money
  4. The function I left public, and the stranger who emptied it
  5. One recipient's wallet froze the payout for everyone else
  6. Three lines that looked correct, and an empty vault by Sunday
  7. The short list of named holes almost every hack falls through
  8. The gas savings that quietly cost you a security check
  9. The user history that was gone because nobody wrote it down
  10. Green across the board, and drained anyway. What did the tests miss?
  11. … and more
ANVIL You test against a slow public testnet, so why can't you reproduce the bug that would cost you funds? Fork mainnet and break your contract a thousand times locally before anyone else can try.
  1. The testnet that wasted your week
  2. Stop begging a faucet for test ether
  3. A private copy of mainnet, without downloading it
  4. The bug only a real whale can trigger
  5. Test a 30-day lock in a millisecond
  6. Your tests pass. Would the real USDC agree?
  7. Attack your own vault before someone else does
  8. When a test reverts and won't say where
  9. The test suite that only runs when you remember
  10. The one transaction you can never take back
  11. … and more
DEFI You can write a contract, but could you build the pool that holds millions in liquidity and not watch it drain in a single transaction? Build the AMMs, lending, and yield protocols behind on-chain finance, the scarcest and best-paid corner of web3.
  1. The night my ten-line contract inherited someone else's bug
  2. The exchange that sets its own price with one multiplication
  3. The receipt for your deposit, and how the first depositor can rob the rest
  4. The number that decides whether you keep your house or lose it
  5. The stranger who gets paid to seize your collateral
  6. Why your debt grows while you sleep, and who decides how fast
  7. The vault that farms while you sleep, and the one that farms your users
  8. How to pay a million users their exact share without a single loop
  9. Where your protocol gets its prices, and why the cheap way gets you drained
  10. Free money for one transaction, and the attacks it makes possible
  11. … and more
TOKENIZATION You can mint an ERC-20 in an afternoon, but can you design a stablecoin that stays worth a dollar when everyone runs for the exit? Ship the tokens, stablecoins, and tokenized assets institutions are racing to put on chain.
  1. The day a mapping became somebody's savings
  2. The approval you granted last month just got spent twice
  3. How do I make one token that nobody can copy?
  4. One contract, a thousand assets, and I'm out of gas deploying them all
  5. Who is allowed to print money, and how do I stop them?
  6. Why does the coin that promised one dollar keep going to zero?
  7. I shipped a bug into a contract I can't edit. Now what?
  8. One leaked key just minted a billion tokens
  9. The regulator wants me to freeze an address. Can my token even do that?
  10. I put a gold bar on chain. How does anyone know it's really there?
  11. … and more
AUDITING Your contract compiles and passes its tests, so why can you still not see the exploit that empties it? The highest-paid security skill in the field. Spot the exploit before a contract holds millions, and every protocol wants you on the team. The 9 Keys to Getting Your Evenings Back and Your Reach Back
  1. The night Maya stopped reviewing pull requests
  2. Trust them to merge, then go check the whole thing
  3. What a wall of red linters tells you that no diff will
  4. The coverage number was 87 percent and the checkout was untested
  5. The library you installed two years ago is now the way in
  6. Pay someone to break in before someone breaks in for free
  7. Draw the database you already have and see what it became
  8. The map of who calls whom, and the circle nobody meant to draw
  9. The endpoint that got slower every week and nobody filed a ticket
  10. It is 3am and production is down. Can you actually see anything?
  11. … and more
Read a free sample
ZK Everyone talks about zero-knowledge proofs, proving something without revealing it, but can you tell the hype from the real thing? Understand the cryptography reshaping privacy and scaling, a skill almost nobody has yet.
  1. The bank that asked for a number you swore to hide
  2. Drop one of these three and your proof protects no one
  3. Why your proof breaks the moment no one is left to answer
  4. The only thing a zero-knowledge system can actually prove
  5. Why there is no best proving system
  6. The 2 KB blob that can quietly drain the whole contract
  7. Write a circuit like code and you ship a hole
  8. Showing you belong to a set without revealing the set
  9. Getting a contract to say yes without learning a thing
  10. When a $10 transfer costs more than $10 to settle
  11. … and more

Right now, maybe this is you:

  • You ship off-chain features while other engineers own the on-chain systems, name their price, and work from anywhere.
  • You can write a smart contract by copying examples, but you can't reason about what the chain does underneath.
  • Your contract compiles and passes its tests, and you still can't see the exploit that would empty it.
  • Some of the biggest paychecks in engineering keep going to the few who build and audit on-chain, and you're on the outside.

In no time, you could:

  • Sign off on the smart contracts a real product depends on, a scarce and top-paid engineering skill.
  • Step into web3 while few engineers can, and name your price.
  • Become the engineer protocols pay top rates to have on the team.
  • Move into some of the best-paid, often-remote work in the field.

Roles you could apply to

Real, current openings for this track. Learn the skills in this pack and you could apply to roles like these.

Job opening
Job opening
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Job opening

There are plenty of openings like these right now, and demand for this profession looks to be growing. The more of this you can do, the more doors tend to open.

These are real postings shown as examples. We don't recruit for them and can't promise you'll be hired. What you do with the skills is up to you.

Written by

Alex

Alex

Backend & AI engineer · quantumalex.com

I write the guides I wish I had when I started: distilled from real production work, incidents, and code reviews, not from documentation. Every guide teaches the decisions that matter once a system meets real traffic.

Today I build and audit the on-chain systems behind real products, where a bug is public and expensive and the pay reflects it. It is a scarce skill and among the best paid in engineering, and I got in while few others could.

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Because you're buying today, these are yours at no extra cost:

Rust The Rust review skill that makes you the one trusted to sign off on production, and paid like the senior who can One of the highest-paid, scarcest skills in tech. Learn it and price yourself accordingly.
  1. You didn't write this Rust, but you're the one shipping it
  2. What the agent's borrow-checker fix quietly costs you
  3. Does this type make bad data impossible, or just possible to catch?
  4. Your REST contract is a promise strangers will build on
  5. Why "it compiles and runs" tells you nothing yet
  6. Database code that breaks only under load or attack
  7. Did this really need an actor, or did it just look impressive?
  8. Will this shared state run in parallel, or serialize under load?
  9. When one outside API call becomes your outage
  10. A login that looks secure and is wide open
  11. … and more
Vibe Coding Become the programmer AI multiplies instead of replaces, the one who brings the judgment the machine still doesn't have Ship in a fraction of the time, so you take on more work, earn more, and get your evenings back. The 8 Keys to Becoming the Programmer AI Multiplies Instead of Replaces
  1. My story vibe-coding (and what it cost me)
  2. If the AI writes the code, why do I still need to know how?
  3. Why does the AI keep giving me code I can't use?
  4. Everything works now, but every change breaks something somewhere else
  5. How do you fix a bug in code you never wrote?
  6. My tests pass. How do I know they're testing anything?
  7. It looks perfect. How do I catch what's broken before I merge?
  8. The AI built exactly what I asked for, and it's still the wrong thing
  9. The AI wrote it. Who answers when it breaks?
  10. The mistakes that are going to cost me. How do I see them coming?
  11. … and more
Sample it free
Claude Stop treating Claude Code like a chatbot that happens to write code and learn to drive it like the agentic engineer it is, across the terminal, your editor, the desktop, and CI, so it ships a day's work in an hour without leaving you a mess to clean up Get a day's work done in an hour with Claude Code, the tool the best engineers now run circles with. The 7 Steps to Doing a Day's Work in an Hour With Claude Code
  1. The day it wrote a day's work in an hour, and the day it made a mess
  2. I have it open in a terminal. When should I be using something else?
  3. It keeps forgetting how my project works. How do I stop re-explaining it every time?
  4. It did something impressive and something wrong in the same change. How do I catch the wrong part before I trust it?
  5. How do I let it fly on the boring stuff without letting it touch the thing that pages me at 3am?
  6. I want three things happening at once without them stepping on each other
  7. It doesn't know about my database, my rules, or my commands. How do I teach it my stack?
  8. Can it review the pull request and fix the bug while I'm asleep?
  9. Who I became once I stopped typing every line
Take a look inside
Ownership Become the engineer everyone trusts with the thing that cannot fail, by owning the outcome instead of your ticket, driving problems to root cause and to done, and closing the loop so nothing falls through the cracks on your watch Become the engineer they trust with the thing that can't fail, and get paid like it. The 6 Habits of the Engineer Everyone Trusts With the Important Thing
  1. The release I did my part on, and it broke anyway
  2. Nobody said it was mine, so it just sat there. How do I become the one who says "I've got it"?
  3. I fixed it, and a week later it broke again in the same place
  4. Something broke and everyone's pointing fingers. How do I be the one who just fixes it?
  5. I did my part and handed it off, so why did it still fall apart?
  6. It's done, but somehow my manager is still asking me if it's done
  7. It's not my job, and it's quietly breaking. Do I step in or stay clean?
  8. The day they handed me the thing that could not fail
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YOUR INVESTMENT

Everything you get
One payment. Yours to keep.

  • BlockchainA practical guide to how a blockchain actually works, from consensus and cryptography to transactions, blocks, and the virtual machine $99.99
  • SolidityThe Solidity skill that gets you paid to be the one trusted with code that holds real money $99.99
  • AnvilBecome the engineer trusted to ship a contract that holds real money, the one who finds the drain before an attacker does $99.99
  • DeFiBuild the DeFi protocol that holds real money and does not get drained, and be the team whose pool survived the attack. $99.99
  • TokenizationThe token skill that gets you paid to be trusted with the assets other people hold, trade, and lend against $99.99
  • Smart Contract SecurityGet your evenings back and stop being the bottleneck at the merge button, trusted to keep the whole codebase healthy while the team ships without you $99.99
  • ZKThe frontier crypto skill almost no one has and the best get paid the most for, finally made understandable without a cryptography degree $99.99
  • BONUS RustOne of the highest-paid, scarcest skills in tech. Learn it and price yourself accordingly. $99.99
  • BONUS Vibe CodingShip in a fraction of the time, so you take on more work, earn more, and get your evenings back. $99.99
  • BONUS ClaudeGet a day's work done in an hour with Claude Code, the tool the best engineers now run circles with. $99.99
  • BONUS OwnershipBecome the engineer they trust with the thing that can't fail, and get paid like it. $99.99
  • Lifetime access + every future updateNo extra cost, ever ∞
You pay once and every future guide is added free. The pack only gets bigger, so today's price is the lowest it will ever be. Lock it in before the next guide ships.

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Work through any guide, apply it to a real project, and if you don't feel closer to doing this work professionally, email us within 30 days for a full refund.

ALWAYS GROWING

The course keeps growing. You keep all of it.

You pay once and get lifetime access. Every time we improve a guide, add new chapters, new videos or new exercises, it lands in your library at no extra cost, forever.

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  • New exercises and templates
  • Lifetime access, no subscription, no renewals
FAQ

Answer your doubts before you decide.

Isn't all this free on YouTube and the official docs?

The docs teach the tool; these teach the decisions and the failure modes the docs skip. You pay to skip months of trial and error and learn what only shows up in production.

Is it useful if I already know the basics?

Yes. The guides go to the production decisions and failure modes most people learn the hard way, not the introductory material.

Is it beginner or advanced?

Written for anyone who already writes code. They go straight to the decisions, so you skip the filler whatever your level.

Is it theory or practice?

Practice. Real functions, real failures, real reviews, walked step by step, not abstract theory.

How do I get them, and in what format?

Instantly, as PDFs you download the moment you buy, on any device, and keep forever.

Will they become outdated?

The decisions and failure modes outlast any version, and every update is free for life.

What if it's not for me?

If a guide hasn't helped within 30 days, email us and we refund everything.

THE DECISION IS NOW

You keep shipping off-chain features and stay where you are. Or You own on-chain engineering, and the best-paid, work-from-anywhere roles in the field open up to you.

You're the engineer who signs off on the contract before it goes live holding real money, a scarce, top-paid skill that usually runs remote.

I'm starting today →

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