Conceptual Synaesthesia as Cognitive Literacy
I don’t just feel things; I translate them. For those of us who experience it, synaesthesia is not a novelty. It is a structure for thinking.
Inside Airgeek: Deriving Timing of Offline Measurements
Written by David Čepelík Published June 16, 2025
I built something that changed my friend group's social fabric
This is a story that started back in 2022, but I think its a perfect time to reflect on the impact that it has had on my friend group still to this day. A year or so before COVID, our friend group dispersed across the world - I moved to
“True Lies” – or “What LLVM Claims, but Fails to Deliver”
Bugs, defects, deficiencies and flaws of LLVM’s Clang C compiler and its compiler-rt runtime library
Polars Boosted My Algorithm's Speed by 25x
The open-source Polars library touts huge performance gains over Pandas. A combination of parallel processing, Apache Arrow, and a...
Abstraction boundaries are optimization boundaries
The N+1 query problem occurs when your application code sends one SQL query per element in a collection. The N queries are redundant; since all of the data is in the database already, a single...
Parsing JSON in Forty Lines of Awk
A single-function JSON parser for the POSIX shell.
Notes on software engineering beyond the code
I recently started thinking about the non-obvious things I’ve learned from other people over the last 5–7 years working as a software engineer. Here are a few of them. "Don't let work find you,...
The Heart of Software Engineering Still Beats - Annie Vella
A few weeks ago, I had a conversation that’s stayed with me. A colleague from another department said: “I’ve always been able to read and understand code, even debug it, but I could never write it.” Something about this revelation stayed with me. Most people I…
Leveraging (abusing?) external formatters in Zed
I really like formatting my code I guess
A snapshot from the Walkman era
Sometimes, in the middle of life, out of nowhere, random snapshots from the past pop into our minds. It could happen while walking, reading a book, or watching a view. For me, it usually happens when I’m coding or looking at a landscape. This time, while I was…
Engineered Addictions
How silicon valley is putting a price tag on your attention - and relationships
JavaScript™ Trademark Update | Deno
The Trademark Trial and Appeal Board has dismissed our fraud claim against Oracle. We disagree with this decision.
Ticket-Driven Development: The Fastest Way to Go Nowhere
When every dev is just doing the next ticket, who’s steering the ship?
Running External Commands in C# and Wait Until They Finish
Ever needed your C# application to run a PowerShell script, wait until it's done, and print the...
MCP: An (Accidentally) Universal Plugin System
Or: The Day My Toaster Started Taking Phone Calls
Looking Back on 20+ Years of Programming - Dev Leader Weekly 100
Welcome to another issue of Dev Leader Weekly! In this issue, I discuss my reflections looking back on 20 years of programming and building software.
Weekly Recap - 2025-06-27
Check out this week from Dev Leader! Here's a list including articles and videos on software engineering, career development, and programming in C#!
The software engineering "squeeze"
Becoming a software engineer was a life hack. The best profession on earth deserved the wake up call
Testcontainers Best Practices for .NET Integration Testing
Integration tests shouldn't rely on external infrastructure—but they also shouldn't mock everything away. In this post, we look at how to use Testcontainers in .NET to spin up real Postgres and Redis instances in your tests, how to manage container lifecycle u…