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The Missing State In Your State Machine
The situation in which an item is acknowledged but not yet stored is a perennial problem in state machines
Jun 17
•
Alvaro Duran
3
3
Virtual Bank Accounts Are Virtually Inexhaustible
Why are we using unstructured text when a strict alphanumeric ID can do the job better?
May 27
•
Alvaro Duran
2
2
Why Database-Layer Double-Entry Is a Bet, Not a Guarantee
An invariant baked into the schema doesn't survive a changing business
May 6
•
Alvaro Duran
1
There Are Only 3 Databases You Can Trust With Your Money
Why the most popular choices are the most risky, and which ones to choose instead.
Apr 22
•
Alvaro Duran
Nobody Got Fired for Uber's $8 Million Ledger Mistake?
LedgerStore became a case study for DynamoDB, and system design publications keep praising it to this day. But the design was abandoned 3 years after it…
Apr 15
•
Alvaro Duran
6
3
2
Ledger Transactions Don't Have to Be Atomic
Up-in-the-airness, and looking at ledgers through the lens of Sagas
Apr 8
•
Alvaro Duran
3
Why Ledgers Are More Than Data Warehouses of Money
And why integrity, not double-entry, is the foundation of financial software
Mar 25
•
Alvaro Duran
1
Why Ledgers Must be Immutable
Ledgers are a “get your shit together” tool.
Mar 4
•
Alvaro Duran
3
Why Low Cardinality Accounts Are A Ledger's Bottleneck
You can build a ledger that’s blazingly fast with a slow programming language.
Jan 28
•
Alvaro Duran
2
TigerBeetle's Stablecoin Mistake
Is there such a thing as "the ultimate fintech database"?
Jan 21
•
Alvaro Duran
2
From Stock Markets To Ledgers, Part VI: Mechanical Sympathy
3 books to satiate your curiosity and ambition
Dec 10, 2025
•
Alvaro Duran
Raft Consensus in 2,000 words
Understanding the Understandable Consensus Protocol
Nov 12, 2025
•
Alvaro Duran
2
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