Cheat sheet for system design interviews
A repeatable framework for system design interviews
Cheat sheet for system design interviews launched on July 30, 2026 with 1 votes.
What it does
A 16-page cheat sheet built for senior/staff software engineers: a 5-step answer framework, capacity estimation numbers, and 10 fill-in-the-blank playbooks for the questions that come up again and again — URL shorteners, rate limiters, chat systems, and more.
Written by a practicing software architect — the same framework used to prep for senior/staff-level system design loops.A tight, opinionated PDF/Notion doc covering the 15-20 system design patterns that come up repeatedly (rate limiters, URL shorteners, chat systems, feed ranking), each with a template for how to structure your answer under time pressure.
Does a similar job
all alternatives →
I'm writing a free, illustrated textbook for system design interviews2021 · docs.google.com · ▲67📕 SystemDesign.org Textbook for System Design ✅ Step-by-Step Illustrated Guide ✅ Curated Questions ✅ + pages ✅ Completely Free 🤑 📖 Document link: systemdesign.org Why are we writing this book? After talking to hundreds of engineers and candidates at FAANG companies, we fo...
The Interview Cheat Sheet2016 · fearlesssalarynegotiation.com · ▲95A two-page printable PDF to prepare you for every interview
LeetSys2025 · leetsys.dev · ▲7I built a free platform for practicing system design interviews!: https://leetsys.dev. The currently available problems will always be listed as free! It lets you chat with an interviewer in real time as you work through a system design problem. It also gives you detailed feedback at the end of the interview that you can use to assess your performance and see where you can improve. Please try it out and let me know what you think!
More dev tools this month
the category →
open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.
Dev tools · 29d ago · github.com
Contribute to oosexgang/hackios-xnu-kernel development by creating an account on GitHub.
Dev tools · 17h ago · github.com
Contribute to reladraw/reladraw development by creating an account on GitHub.
Dev tools · 27d ago · github.com
OpenBot▲362Grok Bot alternative: free, local, open-source, multiplayer
Dev tools · 24d ago · openbot.run
Talanoa▲346Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…
Dev tools · 22d ago · talanoa.email
Source: Product Hunt launch ↗
Launched alongside, July 2026
the whole month →- IR
I might be the only SRE on Earth with his own bowling center. It's a more in-depth gig than you'd think. My family and I bought an abandoned 8-lane bowling center in the rural mid-west. In our small town there weren't many recreation options for families. You've heard of a food desert? This is an R&R desert. It had been abandoned for a good reason. The roof leaks, the electrical system was constantly surging, and my 70-year-old bowling equipment (still) doesn't work perfectly. The system that keeps your score is particularly interesting to me. It's the thing you watch during your game, but…
Life & fun · Jul 2026
18 Words▲1,160Play 18 Words, the free daily word puzzle. The official home is 18words.com. Tap Play now to open today
Life & fun · Jul 2026 · 18words.com
- BA
Over the past few months, our team has been building more and more slidedecks using web frontend technologies with coding harnesses like Claude Code, but a common complaint is to make even small edits we need to edit the code either manually or via the harness. To avoid this loop, I ended up creating Bento, a single HTML file with everything you need in a slide tool including animations and shared editing. There's no install or cloud login, everything works offline. The default deck is around 560 KB and it doesn't need to fetch anything once you got it. Open it in a browser and then you can…
Dev tools · Jul 2026 · bento.page
A few days ago I found myself trying out GLM 5.2 and was really positively impressed. The capabilities and security I was getting from this LLM are similar to those I've gotten from models like Claude or GPT, and this really surprised me. But then I thought, "I wonder how it would work on a normal computer like mine," and above all, "I wonder if it would work without going into OOM on a computer like mine." So I started working with the help of agents to test this possibility. I started converting the model to int4, understanding MTP usage, and if possible implementing DSA for long context.…
AI · Jul 2026 · github.com
OpenSEO▲928Hello! For the last 2 months, I've been building OpenSEO. It's a user friendly UI wrapping the DataForSEO API which has high quality SEO data for keywords, backlinks, AI SEO and competitor research. Instead of paying $100+ per month, you buy DataForSEO credits and pay only for usage. The coolest thing about the project so far has been hearing about what people are building on top of it. People are using coding agents to quickly integrate with Google Search Console, Google Ads and building their own AI SEO and reporting features. Many were already building their own custom solutions around…
Dev tools · Jul 2026 · openseo.so