Author

The Speedcraft Lab

@speedcraft21

articles: 14
total claps: 1,506
top claps: 592
avg read: 5.2 min
paywalled: 14
active: 2025-10-24 → 2026-08-10

Wiki topics

☁️ · DevOps & Cloud · 4 🌐 · Web Development · 2 💻 · Programming · 2 🔒 · Cybersecurity · 1 ECO · Economy · General · 1 GRW · Growth & Analytics · 1 🔧 · Data Engineering · 1 EVAL · Evaluation & Benchmarks · 1

Top tags

#software-development ·4 #distributed-systems ·3 #system-design-interview ·3 #production ·2 #reliability ·2 #elixir ·2 #staff-engineering ·2 #cursor ·1 #ai-agent ·1 #generative-ai-tools ·1

TH The Speedcraft Lab · CodeToDeploy

The Stripe System Design Question That Separates Senior From Staff Engineers

Most candidates answer the wrong question entirely. Here is why the stakes are higher than they appear.

Mar 23, 2026 · 6 min read · 592 claps paywalled #system-design-interview #distributed-systems #idempotency

The Stripe System Design Question That Separates Senior From Staff Engineers

MDA

TH The Speedcraft Lab · Beyond Localhost

How Netflix Handles 260 Million Concurrent Streams Without Buffering

Most of the hard problem is solved before you press play.

Jul 10, 2026 · 5 min read · 334 claps paywalled #netflix #system-design-interview #staff-engineering

How Netflix Handles 260 Million Concurrent Streams Without Buffering

TCH

TH The Speedcraft Lab · Beyond Localhost

Our API Had a 6-Second P99 for 8 Months. Nobody Noticed Until a Customer Tweeted.

The metric that wasn’t being measured. The alert that was never set up.

Mar 30, 2026 · 4 min read · 187 claps paywalled #performance #debugging #percentiles

Our API Had a 6-Second P99 for 8 Months. Nobody Noticed Until a Customer Tweeted.

ART TCH

TH The Speedcraft Lab · Beyond Localhost

How Cloudflare Serves 55 Million Requests Per Second From 3 Engineers’ Laptops

The V8 isolate bet that powers Workers, the density problem nobody names, and the one interview answer that actually lands.

Apr 22, 2026 · 4 min read · 174 claps paywalled #cloudflare #system-design-concepts #edge-computing

How Cloudflare Serves 55 Million Requests Per Second From 3 Engineers’ Laptops

TCH

TH The Speedcraft Lab · Beyond Localhost

Google Found a Way to Make Serverless Actually Fast

Most cloud functions wake up like a hungover laptop. Google’s can wake up in under 100 milliseconds when you configure them right. Here’s…

Jan 19, 2026 · 5 min read · 76 claps paywalled #serverless #google-cloud #cloudrun

Google Found a Way to Make Serverless Actually Fast

TH The Speedcraft Lab · Beyond Localhost

Your 90% Code Coverage Is the Most Expensive Vanity Metric

The coverage report is not wrong. It is answering a question you never asked.

Jun 12, 2026 · 5 min read · 56 claps paywalled #code-quality #code-coverage #software-development

Your 90% Code Coverage Is the Most Expensive Vanity Metric

TCH

TH The Speedcraft Lab · Beyond Localhost

I Watched the Other Candidate Pass the Snowflake L5 Loop. Here Is What She Did Differently.

Same question. Same hour. Wildly different signal.

Jun 15, 2026 · 5 min read · 46 claps paywalled #system-design-interview #snowflake-data-cloud #software-development

I Watched the Other Candidate Pass the Snowflake L5 Loop. Here Is What She Did Differently.

TCH ECO MKT

TH The Speedcraft Lab

We Picked Elixir for Real-Time at 40K Concurrent. Here Is the 2-Year Verdict.

The BEAM kept its promise. The hiring market kept ours, too.

Jun 05, 2026 · 6 min read · 11 claps paywalled #elixir #beam #websocket

We Picked Elixir for Real-Time at 40K Concurrent. Here Is the 2-Year Verdict.

TH The Speedcraft Lab

Discord Dropped 17% of Sessions and Found a Single Threaded Bottleneck a Million Messages Deep

Adding replicas does not remove a bottleneck if every replica contains the same single process.

Aug 10, 2026 · 7 min read · 9 claps paywalled #discord #distributed-systems #reliability-engineering

Discord Dropped 17% of Sessions and Found a Single Threaded Bottleneck a Million Messages Deep

TCH

TH The Speedcraft Lab

Docker Buildx: $5 Multi-Arch Deploy on Fly.io

When your ARM container fails at midnight, one flag fixes everything

Oct 24, 2025 · 6 min read · 9 claps paywalled #docker #buildex #arm64

Docker Buildx: $5 Multi-Arch Deploy on Fly.io

TH The Speedcraft Lab

I Gave Cursor Write Access to Production for a Week. It Nearly Shipped a Billing Bug.

The refactor looked perfect. It also would have charged customers twice.

Jul 15, 2026 · 5 min read · 7 claps paywalled #cursor #ai-agent #generative-ai-tools

I Gave Cursor Write Access to Production for a Week. It Nearly Shipped a Billing Bug.

TCH

TH The Speedcraft Lab

Rust Futures Under the Microscope: Understanding Executor Overhead

A profiling-driven look at how polling, waking, and scheduling actually work and where the hidden costs live.

Nov 20, 2025 · 5 min read · 3 claps paywalled #rust #programming #python

Rust Futures Under the Microscope: Understanding Executor Overhead

AI TCH

TH The Speedcraft Lab · Beyond Localhost

We Picked Bun for Our Backend in 2025. Here Is the 2026 Audit.

The benchmarks held up. The ecosystem did not.

Jun 17, 2026 · 6 min read · 1 claps paywalled #buns #nodejs #compatibility

We Picked Bun for Our Backend in 2025. Here Is the 2026 Audit.

TCH

TH The Speedcraft Lab

Our Search Was Down for 3 Hours on Cyber Monday. The Root Cause Was a Typo From 2022.

The technical debt always picks the worst moment.

May 25, 2026 · 4 min read · 1 claps paywalled #devops #kubernetes #aws-outage