On the roadmap
Adaptive quizzes
A wrong answer triggers a follow-up question that drills the underlying misconception — not the next item on the list.
What’s new on Prof
Recent additions and what’s coming next.
We ship to Prof every day. Below is what’s recent and what’s queued.
Coming next
On the roadmap
Tutor v2.0
Sharper Socratic question selection, concept-aware follow-ups, persistent memory across sessions.
On the roadmap
More company interview guides
FAANG-tier coverage past Meta · Google · Amazon · Microsoft · Apple — into the labs and the high-paying second tier.
On the roadmap
Voting board for content
Tell us which lessons, courses, and case studies you want next. We ship to votes.
Recently shipped
MAY 20, 2026
FEATURE
A curriculum you can see
The courses page is now a dependency map: see how all 7 courses build on each other, from regression through to multi-agent systems, each tagged with what it actually teaches. Press / anywhere to jump to any of 116 lessons, and the new keyboard shortcuts (j/k to move, ? for the full list) make it feel like an IDE, not a catalog.
Open the curriculum →MAY 19, 2026
FEATURE
Streaks, sitemaps, and a friendlier 404
Reading a lesson or solving a practice problem now feeds your streak — same flame, two paths in. Every lesson has its own social card, the sitemap is current across 116 lessons, and missing course URLs land on a course-aware 404 instead of a dead end.
Start a streak →MAY 18, 2026
COURSE
Video lessons across 7 courses
Sixty-nine lessons now ship with an embedded walk-through video alongside the written explanation. Watch the concept, read the deep-dive, do the quiz — pick whichever order learns best for you.
Open a video lesson →MAY 17, 2026
FEATURE
Like a lesson, keep it forever
Tap the heart on any lesson to bookmark it. Likes work signed-out (saved on your device) and sync to your account the moment you sign in — so a favorite tagged on a phone shows up on the laptop.
MAY 16, 2026
COURSE
New /courses experience — 116 lessons, one home
Every lesson now lives at prof.lexailabs.com/courses with a left-rail sidebar, in-page TOC, breadcrumbs, reading progress, and the SocraticTutor auto-mounted at the bottom of every page. Practice and courses share the same chrome now.
Browse courses →MAY 13, 2026
TUTOR
Quiz that teaches
Every wrong answer in our quizzes now comes with an explanation. Across the Attention course alone, we've audited 35 questions with editorial-grade explanations and concept tags — so you know not just what's right, but why.
Open the Attention course →MAY 12, 2026
COURSE
Deep Sequence Modelling — with animated gradient flow
Eight lessons on RNNs and LSTMs, with hand-built SVG animations for vanishing/exploding gradients, BPTT, gate mechanics, and more. Watch a 100-timestep RNN shred its own signal.
Start the RNN course →MAY 10, 2026
PRACTICE
50+ ML problems live in your browser
Build a GPT-2 from scratch in 8 problems. Build a CNN in 6. Build a neural network in 7. Plus 29 standalone interview problems. Every one runs Python in the browser via Pyodide — no setup, no submission queue.
Open Practice →MAY 1, 2026
COURSE
Build and Train Your Own GPT-2
An 11-lesson course taking you from token embeddings to text generation. Every concept rebuilt from first principles in PyTorch, ending with a working tiny GPT-2.
Build the model →APR 15, 2026
COURSE
ML System Design — 17 lessons and 4 case studies
Designing real ML systems at scale: RecSys, RAG, ranking, fraud detection, ETA prediction, multimodal search. The kind of content interviewers actually probe at staff+ level.
Open System Design →MAR 20, 2026
TUTOR
Prof — an AI tutor that grills your thinking
Click 'Ask Prof' at the end of any lesson. Prof asks you questions about what you just read — without telling you the answers. You'll find out fast what you understood versus what you only recognised.
More on the way. Check back, or watch the Early Access pill in the nav.