What’s new
Everything added to the atlas, newest first. Lifetime Access includes all of it, and everything that comes next.
New course
Nine lessons on the ML design round: framing and metrics, data, features, ranking, serving and evaluation, ending with three worked interviews.
New design
Music Streaming / Spotify(premium)
Design 25: tap any song in a catalogue of over a hundred million and hear it straight away, with an interview script.
New feature
Key points, review mode and check-yourself questions
Concept modules now box their takeaways, interview tips and common mistakes, collapse to a two-minute revision sheet, and end with questions to test yourself.
New page
Latency, data sizes, time conversions, machine capacity and the nines, on one printable page. Free.
Improved
Reading settings and Continue reading
Choose text size, line width and spacing, pick up where you left off, copy a link to any heading, and see your progress through each track.
New feature
Send feedback from any page
A short form at the end of every page for anything unclear, wrong or missing. Every reply gets read.
New section
Six real incidents, including AWS, Cloudflare and CrowdStrike, retold from their official postmortems as design lessons.
New course
Frontend System Design(premium)
Rendering, client state, networking, performance, real-time collaboration and accessibility, ending with four component designs worked as interviews.
Improved
PostgreSQL and Kafka, in depth(premium)
Both pages rewritten as full deep dives: internals, failure modes, numbers to remember and interview answers.
New page
Finding the nearest stored vectors fast enough to sit in a request: the retrieval layer under RAG, semantic search and recommendations.
New design
Collaborative Whiteboard / Miro(premium)
Design 24: an endless canvas whole teams draw on together, with an interview script.
New design
Online Chess / Chess.com(premium)
Design 23: every move checked and timed by the server, a fair opponent in seconds and millions watching, with an interview script.
New design
Design 22: hundreds of people in one design file, every drag on everyone's screen in a fraction of a second, with an interview script.
New design
Design 21: text in, a cloned or library voice streamed back within a few hundred milliseconds, with an interview script.
Improved
A new home page, and a new address
The atlas moved to systemdesignatlas.dev, with a home page that walks a request through a live diagram.
New design
Design 19: answers streamed to a billion people a week, each one holding a GPU for its whole length, with an interview script.
New design
RL Environment Platform(premium)
Design 20: thousands of isolated, reproducible agent episodes for evaluation and RL training, with an interview script.
New design
AI Agent Platform / Lindy(premium)
Design 16: agents that run for days and must act exactly once, with an interview script.
New feature
One payment unlocks every premium page, course and feature, including everything added later.
New design
AI App Builder / Lovable(premium)
Design 18: a prompt becomes a running web app in seconds, and a bad generation must never break it, with an interview script.
New feature
Listen(premium)
Have any page read aloud in your browser's voice, highlighting each paragraph as it goes.
New course
Build one production AI application end to end, a working layer per lesson.
New page
Fifty terms for building with language models, in the order you meet them, from how a model reads text to what it takes to ship.
New feature
Abbreviations, explained
Hover or tap any abbreviation to see it spelled out.
New section
Pages on the technologies real designs name: what each is for, how it works and when to pick it.
New feature
Interview scripts(premium)
Each design read as a 45-minute interview, with notes on why each move scores.
New feature
Interactive diagrams
Click any box in an architecture diagram for its role and trade-off, and zoom into scaled-out tiers.
New section
Concept modules read in order, and worked designs that open with the hard part.