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A tenth of a microsecond became a third of a second
Floating-point errors are harmless one at a time. A chain of them isn't.
Oct 23
•
Franco Fernando
6
2
1
Your computer can't store 0.2
0.2 has no end in binary, so the machine stores its closest neighbor.
Oct 16
•
Franco Fernando
9
1
No single data structure can build a fast cache
A hash table finds the entry. A linked list keeps the order.
Oct 9
•
Franco Fernando
12
1
2
Your services talk to each other like strangers on the internet
REST at the edge. gRPC inside.
Oct 2
•
Franco Fernando
14
2
September 2026
The most dangerous change to a published API is a rename
Diff the spec. Fail the build.
Sep 25
•
Franco Fernando
9
1
You can refactor everything except your API
Coupling, not naming. First article on API design.
Sep 18
•
Franco Fernando
26
1
4
Latency: What It Is and What Limits It (Part II)
Where delays hide in the stack, how they add up, and how to measure them.
Sep 11
•
Franco Fernando
10
3
Latency Is Not a Single Number
What latency really is. The physics and math that bound it, and why the average always lies.
Sep 4
•
Franco Fernando
11
2
August 2026
Exception Handling in Practice
Patterns and anti-patterns for signaling, catching, and surviving failures in your code.
Aug 28
•
Franco Fernando
14
3
Logistic Regression
How a classification model learns to predict probabilities instead of flat yes/no answers.
Aug 21
•
Franco Fernando
8
1
Disjoint Sets: From Linear to Almost Constant Time
Tracking which items belong to the same group looks trivial, until your inputs get big.
Aug 14
•
Franco Fernando
6
1
IP Addressing, Part III: Inside the IP Packet
What actually travels on the wire: the IPv4 header, fragmentation, and what IPv6 changed.
Aug 7
•
Franco Fernando
12
1
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