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Oliver Buchannon
Alex Zajac

Software Engineer II @Amazon Prev. Machine Learning @ Ecole Polytechnique System Design, WebDev and AI enthusiast

Weekly Digest

🍔🧠 How Uber Protected 100M+ RPCs/Sec With Their Rate Limiting System

Feb 16, 2026

•

10 min read

🍔🧠 How Uber Protected 100M+ RPCs/Sec With Their Rate Limiting System

PLUS: Open Source LM Breakthrough 🔮, Behavioral Interviews 101 🫡, OpenAI Atlas Architecture 🗺️

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 The Database Pipeline That Powers Pinterest's 600M Users

Feb 9, 2026

•

10 min read

🍔🧠 The Database Pipeline That Powers Pinterest's 600M Users

PLUS: Major Tech Ban In France 😮, AI Agents While You Sleep 😴, Queue Architecture Deep Dive ⚡

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Google Handles Billions of Daily Auth Permissions

Feb 2, 2026

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9 min read

🍔🧠 How Google Handles Billions of Daily Auth Permissions

PLUS: Microsoft's Linux Drama 🐧, Scale To 10M Users Guide 📊, Microservices Simply Explained 🔍

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How OpenAI Scaled PostgreSQL to 800M ChatGPT Users

Jan 26, 2026

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10 min read

🍔🧠 How OpenAI Scaled PostgreSQL to 800M ChatGPT Users

PLUS: jQuery 4.0 🆕, HDFS Scaling Secrets ⚡, Napkin Math Engineering 🧮

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 Why Notion Had to Build A Forest for Offline Mode

Jan 19, 2026

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9 min read

🍔🧠 Why Notion Had to Build A Forest for Offline Mode

PLUS: Google's $5B Gemini Apple Deal 💰, AI Handbook For Production 📘, Must-Know Cybersecurity Guide 🛡️

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Google's TPU Architecture Delivers 7.4 TB/s

Jan 12, 2026

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9 min read

🍔🧠 How Google's TPU Architecture Delivers 7.4 TB/s

PLUS: 14 Years At Google 🌟, Software Testing Essentials 🧪, Load Balancer Internals ⚡

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Meta's GEM AI Buffed 5% Ad Conversions

Jan 5, 2026

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12 min read

🍔🧠 How Meta's GEM AI Buffed 5% Ad Conversions

PLUS: OpenAI's Record-Breaking Salaries 🤑, Building Internal AI Agents 🤖, Logging Best Practices Guide 📝

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Shopify Handles 10T Black Friday Requests (Their Secret Scaling Strategy)

Dec 29, 2025

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12 min read

🍔🧠 How Shopify Handles 10T Black Friday Requests (Their Secret Scaling Strategy)

PLUS: Software Architecture With Claude 🏗️, SSD Database Explained 💽, Meta's Linux Gaming Secret 🎲

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 Inside Netflix's 99.999% Deployment Pipeline

Dec 22, 2025

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12 min read

🍔🧠 Inside Netflix's 99.999% Deployment Pipeline

PLUS: AI Agents Eat SaaS Revenue 💸, Production Debugging At Meta 🔧, System Design Fundamentals 📘

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Cloudflare Powers the Internet with Infrastructure as Code

Dec 15, 2025

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11 min read

🍔🧠 How Cloudflare Powers the Internet with Infrastructure as Code

PLUS: Disney Characters Coming To ChatGPT 🎭, DoorDash's 80M Requests 🔄, LinkedIn's Epic Caching Story 🚀

Alex Zajac
Alex Zajac

Deep Dive

🧠🍔 Why AI Agents Keep Deleting Prod Databases

Dec 11, 2025

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9 min read

🧠🍔 Why AI Agents Keep Deleting Prod Databases

This needs to stop

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Pinterest Reduced Clickbait With Just 5K Survey Responses

Dec 8, 2025

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11 min read

🍔🧠 How Pinterest Reduced Clickbait With Just 5K Survey Responses

PLUS: OpenAI Is In Code Red 🚨, Deep Dive Into Distributed Systems 🌐, Netflix's Write-Ahead Log Architecture 📝

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 Lyft ran 1000s of ML jobs on Kubernetes. Then they stopped.

Dec 1, 2025

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11 min read

🍔🧠 Lyft ran 1000s of ML jobs on Kubernetes. Then they stopped.

PLUS: Twitter System Design 🐦, GraphQL Migration Blueprint 🗺️, OpenAI's Secret Hardware 🔮

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Uber Predicts Driver Earnings Using Deep Probabilistic Models

Nov 24, 2025

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11 min read

🍔🧠 How Uber Predicts Driver Earnings Using Deep Probabilistic Models

PLUS: How Stock Exchanges Work 🏛️, Tinder's Architecture 🔥, JWT From 0 To Hero 🎓

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Datadog Ingests Billions/Sec With Their Unique Database Design

Nov 17, 2025

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11 min read

🍔🧠 How Datadog Ingests Billions/Sec With Their Unique Database Design

PLUS: Postgres Scaling 101 💾, Frontend Design Principles 🎨, Meta's AI Chief Leaves 🤯

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 1,500 PRs: Spotify's Autonomous Coding Agent (Full Architecture)

Nov 10, 2025

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11 min read

🍔🧠 1,500 PRs: Spotify's Autonomous Coding Agent (Full Architecture)

PLUS: ML at Netflix Revealed 🎬, Rust Rewrite Saves $300K ⚡, URL As Application State 🔗

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Airbnb Automated Away GraphQL Testing Hell (With LLMs)

Nov 3, 2025

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11 min read

🍔🧠 How Airbnb Automated Away GraphQL Testing Hell (With LLMs)

PLUS: Understanding RPCs 🔍, Build Your Own Database 🛠️, 10k$ for oral skills 💸

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 The Deep Learning Technique Uber Uses To Trust AI Models

Oct 27, 2025

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11 min read

🍔🧠 The Deep Learning Technique Uber Uses To Trust AI Models

PLUS: PostgreSQL Performance 🎯, SQL Anti-Patterns 😮, Senior Data Engineer Traits 👑

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Netflix Built A Graph DB That Processes 1M+ Events/Second

Oct 20, 2025

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11 min read

🍔🧠 How Netflix Built A Graph DB That Processes 1M+ Events/Second

PLUS: Google's Culture 👀, Inside Nvidia GPU Architecture 🎮, Cap Theorem Truth Revealed 💡

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 100X Faster: How Netflix's ML Workflow Engine Works

Oct 13, 2025

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11 min read

🍔🧠 100X Faster: How Netflix's ML Workflow Engine Works

PLUS: Spotify System Design 🎵, Gradient Descent Deep Dive 🧮, Reactive Python ⚡

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How DoorDash Uses LLMs To Predict 10M+ Customer Grocery Lists

Oct 6, 2025

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11 min read

🍔🧠 How DoorDash Uses LLMs To Predict 10M+ Customer Grocery Lists

PLUS: Google Stack Breakdown 🛠️, S3's Trillion-File System 💾, Compression Algorithms ⚡

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Uber Upgraded 2M Spark Jobs (Saved $MMs/Year)

Sep 29, 2025

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11 min read

🍔🧠 How Uber Upgraded 2M Spark Jobs (Saved $MMs/Year)

PLUS: Android Coming To PCs 💻, Handling 10B Messages Daily 🚀, Load Balancer Deep Dive 🔄

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 Palantir's Database Index Pattern That Cut Query Times By 85%

Sep 25, 2025

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10 min read

🍔🧠 Palantir's Database Index Pattern That Cut Query Times By 85%

PLUS: How Claude Code Works 🤖, Master Rate Limiting Patterns 🚦, OS Kernel From Scratch 🏗️

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 This New LinkedIn AI Pipeline Powers 800M Users

Sep 22, 2025

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11 min read

🍔🧠 This New LinkedIn AI Pipeline Powers 800M Users

PLUS: Claude as Coding Agent 🧠, Migrating 13K Tables in 4 Hours ⏱️, How Linear Scaled Multi-Region 🌍

Alex Zajac
Alex Zajac

Weekly Digest

🍔🧠 How Grab Built An Authentication System for 180+ Million Users

Sep 15, 2025

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11 min read

🍔🧠 How Grab Built An Authentication System for 180+ Million Users

PLUS: How Browsers Work 🕵️ 15-Year-Old Queue Problem ⏳ Python Debugging Tricks 🐍

Alex Zajac
Alex Zajac
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