About Me

I’m Dumitru. I build software for a living, but mostly I just like taking things apart to see how they work. I tinker with code, run long distances, read widely, and travel when I can. This is where I write about whatever I’m curious about.

Latest content

Blog Linklog Books

Link June 22, 2026

Goodbye to sequential integers, hello UUIDv7!

by Buildkite

Why Buildkite moved its primary keys to UUIDv7, which keeps the global uniqueness of a UUID while staying time-ordered enough to sit well in a B-tree index.
Link June 22, 2026

The Wrong Abstraction

by Sandi Metz

The case for un-abstracting: once a shared abstraction starts collecting special cases and flags, inlining it back into plain duplication is cheaper than bending it further.
Link June 19, 2026

B-trees and database indexes

by Ben Dicken

Sizes a B-tree node to a disk page and walks the math from there, showing why the primary key you choose sets how many pages every query has to read.
Link June 19, 2026

Why databases use ordered indexes but programming uses hash tables

by Evan Jones

Hash tables win the single-lookup benchmark, yet databases default to B-trees. The payoff is everything past that one lookup: range scans, sorted reads, and maintaining many indexes at once.
Link June 19, 2026

On Uber's Choice of Databases

by Markus Winand

A point-by-point rebuttal of Uber's famous 'we left Postgres for MySQL' post, arguing the problems were specific to how they used it, not a verdict on the database.
Link May 13, 2026

Learning Software Architecture

by Alex Kladov

matklad on where architectural taste really comes from: reading large codebases closely and noticing which decisions kept them soft enough to change.
Book May 03, 2026

Project Hail Mary

by Andy Weir

★★★★★

Confession: I only read it because of the movie, racing to finish before going. Joke's on me - hard sci-fi this fun, with the best buddy act in the genre, never needed a trailer to sell it.
Book March 23, 2026

The Pragmatic Programmer: From Journeyman to Master

by Andy Hunt, Dave Thomas

★★★★★

The closest thing the craft has to a journeyman's handbook. DRY, orthogonality, tracer bullets - the vocabulary it gave us is still load-bearing decades later.

Let's Connect

If you want to get in touch with me about something or just to say hi, reach out on social media or send me an email.