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⚡ AI Lessons
Dev.to · speed engineer
🧠 Large Language Models
⚡ AI Lesson
1d ago
Upgrading Your Embedding Model Doesn't Break RAG Loudly — It Breaks It Quietly
The problem A team I was helping upgraded their embedding model to cut cost — swapped an...
Dev.to · speed engineer
2d ago
Why CPU-Based Autoscaling Makes Traffic Spikes Worse Before It Makes Them Better
The problem A traffic spike hits. The Horizontal Pod Autoscaler (HPA) is watching average...
Dev.to · speed engineer
6d ago
Your 4 PM Interview Slot Is Silently Grading Candidates Harder Than Your 9 AM One
The problem A few years ago I pulled the numbers on a hiring loop I'd been running for two...
Dev.to · speed engineer
1w ago
The Container Got OOMKilled at 61% Heap Usage. Here's Why Kubernetes Wasn't Lying.
The problem A service I ran was getting OOMKilled roughly twice a week. Pod restarts, a...
Dev.to · speed engineer
⚡ AI Lesson
2w ago
Hyrum's Law: Why You Can Never Actually Deprecate Anything
The problem We shipped a "deprecated" internal field, response.legacy_id, and left it in...
Dev.to · speed engineer
🔍 RAG & Vector Search
⚡ AI Lesson
3w ago
Lost in the Middle: Why Feeding Your Agent More Context Makes It Dumber
The problem You build a RAG pipeline. You test it with 3 retrieved documents and the...
Dev.to · speed engineer
🔐 Cybersecurity
⚡ AI Lesson
3w ago
Your Backups Have Been Silently Corrupt Longer Than Your Retention Window
The problem Corruption gets discovered on read, almost always. A report pulls a file, the...
Dev.to · speed engineer
🚀 Entrepreneurship & Startups
⚡ AI Lesson
3w ago
Your Hiring Freeze Has an Adverse Selection Problem
The problem Every hiring freeze I've watched up close follows the same script: leadership...
Dev.to · speed engineer
☁️ DevOps & Cloud
⚡ AI Lesson
4w ago
The CPU Graph Said 40%. We Were Being Throttled Every Second.
The problem 3 AM, paged for p99 latency on a checkout service that was, by every dashboard...
Dev.to · speed engineer
☁️ DevOps & Cloud
⚡ AI Lesson
1mo ago
Why Chaining Five Fast Services Gives You One Slow One
The problem Five services, each with a P99 latency of 200ms and a comfortable P50 of 20ms....
Dev.to · speed engineer
🔧 Backend Engineering
⚡ AI Lesson
1mo ago
Coordinated Omission: Why Your Load Testing Tool Is Lying About Your P99
The problem You run a load test targeting 1,000 requests/second. The tool reports P50 =...
Dev.to · speed engineer
📋 Product Management
⚡ AI Lesson
1mo ago
The 45-Hour Week That Burns You Out Faster Than the 90-Hour One
The problem Every burnout retro ends the same way: cut the meetings, cap the hours,...
Dev.to · speed engineer
📋 Product Management
⚡ AI Lesson
1mo ago
The Novelty Tax: Why Doing the Same Great Work Twice Gets You a Lower Review
The problem Two cycles ago you shipped the migration that cut p99 latency in half....
Dev.to · speed engineer
🤖 AI Agents & Automation
⚡ AI Lesson
1mo ago
Your AI Agent's Bill Tripled Overnight. The Prompt Cache Broke, Not the Model.
Nobody touched the model. Nobody touched the traffic. Nobody touched the prompts, as far as anyone...
Dev.to · speed engineer
🏗️ Systems Design & Architecture
⚡ AI Lesson
1mo ago
Cache Stampede: The Failure Mode Hiding Behind a 99% Hit Rate
The problem A cache hit rate of 99% sounds like a solved problem. Most dashboards stop...
Dev.to · speed engineer
🏗️ Systems Design & Architecture
⚡ AI Lesson
1mo ago
False Sharing: Why Adding Threads Made Your Code Slower
The problem A team I worked with had a per-thread request counter: one long per worker...
Dev.to · speed engineer
🏗️ Systems Design & Architecture
⚡ AI Lesson
1mo ago
Your Redundancy Math Assumes Independence. Production Doesn't.
The problem Every redundancy calculation you've ever been handed — RAID fault tolerance,...
Dev.to · speed engineer
🔐 Cybersecurity
⚡ AI Lesson
1mo ago
RAID Doesn't Protect You From the Corruption That Actually Gets You
The problem A client's RAID 6 array did exactly what it was designed to do for eighteen...
Dev.to · speed engineer
🎯 Management & AI-Era Leadership
⚡ AI Lesson
1mo ago
The Bus-Factor Paradox: Why the Person Who Understands the System Best Gets Cut First
The problem Every engineer has heard "bus factor" used as a warning: if this person gets...
Dev.to · speed engineer
☁️ DevOps & Cloud
⚡ AI Lesson
1mo ago
Your Retries Are a Load Multiplier: How a 5-Second Blip Becomes a 40-Minute Outage
The problem A downstream dependency gets slow for five seconds — a GC pause, a leader...
Dev.to · speed engineer
🏗️ Systems Design & Architecture
⚡ AI Lesson
1mo ago
Your Average Latency Is Lying to You: The Tail at Scale
The problem Here's a service that looks healthy. Median response time is 10ms. The...
Dev.to · speed engineer
🔧 Backend Engineering
⚡ AI Lesson
1mo ago
Debugging Is a Search Problem: Bisect Everything
The problem Two engineers get the same bug: a value that's correct when it enters the...
Dev.to · speed engineer
🏗️ Systems Design & Architecture
⚡ AI Lesson
1mo ago
Your Struct Layout Is Part of Your Wire Protocol
The problem A message-processing system that comfortably handled 50,000 messages/second...
Dev.to · speed engineer
📋 Product Management
⚡ AI Lesson
1mo ago
Your Manager Can't Remember What You Did in March — and That's a Systems Problem
The problem Every consequential decision about your career — promotion, calibration...
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