slys.dev

Timeouts: the most important number in distributed systems (and the easiest one to get wrong)

Systems Literacy

Aug 3 • Jakub Slys

20

1

July 2026

Backpressure — when saying "slow down" saves the system

System Design Fundamentals

Jul 20 • Jakub Slys

24

4

2

June 2026

Rate Limiting: how Redis, Cloudflare, Stripe, and Envoy do it

Token buckets and sliding windows are the easy part. The hard part is coordination.

Jun 29 • Jakub Slys

19

I taught Claude to read my Substack — here's the gateway behind it

Five repos, one contract, and what vibe coding done well actually means

Jun 8 • Jakub Slys

37

12

5

May 2026

Decision Trees — how machines learn by asking questions

Machine learning fundamentals

May 27 • Jakub Slys

27

8

3

CQRS — when Reads and Writes take different paths

System design fundamentals

May 20 • Jakub Slys

35

11

2

March 2026

Thinking clearly in interviews — Longest Substring Without Repeating Characters

Understanding the why before the code (Rust · Python · Scala)

Mar 30 • Jakub Slys

6

5

Why is my LoadBalancer still <pending>?

How Cilium's LB IPAM and L2 Announcements turn a pending LoadBalancer Service into a reachable VIP on your LAN.

Mar 23 • Jakub Slys

2

4

Logistic Regression — when machines learn to say yes or no

Machine learning fundamentals

Mar 16 • Jakub Slys

21

6

Thinking clearly in interviews — Add Two Numbers

Understanding the why before the code (Rust · Python · Scala)

Mar 9 • Jakub Slys

4

8

How Load Balancing really works — and why it is not just about splitting traffic

System design fundamentals

Mar 3 • Jakub Slys

17

9

February 2026

Linear Regression — the heartbeat of Machine Learning

Machine learning fundamentals

Feb 23 • Jakub Slys

4

7