What's New
ScaleDojo ships continuously. Here's a running record of what's changed - so you always know it's actively maintained.
ScaleDojo is live: interactive High-Level Design practice
The first hands-on way to practice system design: drag real components onto a canvas, wire them together, and get instant AI-scored feedback across five dimensions instead of just guessing whether your design would actually hold up.
Low-Level Design Lab: schema & database design
Practice entity modeling, relationships, and indexing the same hands-on way. Design a schema, submit it, and get scored on correctness and real-world database patterns, not just whether it technically runs.
Leaderboard & Roadmap
Track your progress against other engineers on a live leaderboard, and follow a structured path from beginner to principal-level system design instead of guessing what to practice next.
API Design Lab
Design real REST and event-driven APIs, from endpoints and auth to pagination and versioning, and get scored the way a senior engineer would review a pull request, not just whether the syntax parses.
GenAI Lab: RAG pipelines, agents & vector databases
System design for the AI era. Design retrieval-augmented generation pipelines, multi-agent systems, and vector database architectures: the exact patterns showing up in interviews right now.
Forge Algorithm Lab
Real coding challenges, not just diagrams. Practice the data structures and algorithms questions that still open most technical interviews, auto-scored in Python or Java.
Certifications
Complete a lab track and earn a verifiable certificate you can share on LinkedIn. Proof you didn't just read about system design, you built it.
Draw Your Design
A faster, purpose-built alternative to generic diagramming tools like Excalidraw or draw.io. Describe your system in plain English and get back a real, editable architecture diagram: actual components you can wire up and simulate, not just boxes and arrows.
ScaleDojo Learn: HLD course
17 modules and 54 chapters make up a complete structured course on system design fundamentals, built right into the platform, so you read a concept and immediately practice it in the matching level.
Improved onboarding & analytics
Smoothed out the signup-to-first-lab flow based on user feedback. New users now reach their first hands-on exercise faster with fewer friction points along the way.
Partner & referral portal
Partners and creators now have a dedicated dashboard to track referral clicks, conversions, and payouts in real time.
Pricing page refresh + interview cheat sheet
Redesigned the pricing page with a cleaner side-by-side plan comparison. Also added a free system design interview cheat sheet one page covering the concepts that come up most in senior engineer interviews.
Credit history & account security
Your profile now shows a complete credit usage history so you always know where your credits went. We also shipped several under-the-hood security upgrades to keep your account safer.
Smarter AI Architect Reviewer
The AI reviewer now gives sharper, more actionable feedback tailored to each lab pointing out exactly what to fix and why, instead of generic suggestions.
Mock Interview Arena
Put your system design skills to the test in a real interview simulation. Pick a problem, set a timer, design under pressure, and get an instant AI-scored report with a full transcript so you can see exactly how you'd perform on the day.
SQL Lab
Practice real query-writing and schema-investigation challenges alongside the Database Lab track, with instant feedback on correctness, not just whether your query runs.
Learn courses now live for every lab
Read a concept, then practice it immediately: that structured Learn course experience has now expanded from HLD to all five labs, plus graded assignments in Forge and SQL Lab bridges in the Database Lab.
AI Lab: Python challenges
A new lab track for hands-on Python and AI/ML fundamentals: real coding challenges with instant automated scoring, covering everything from core data structures to the building blocks behind modern AI systems.
Personalized AI Roadmap
Get a custom, week-by-week study plan built around your goals, timeline, and current skill level. Unlike the standard roadmap, this one adapts automatically as you complete levels, so it always points you to exactly what to work on next.
ScaleDojo Newsletter
Get new levels, feature releases, and system design research delivered to your inbox. Subscribe right from the footer or any blog post, no account needed.
Daily Puzzle
A fresh, bite-sized challenge every day across System Design, SQL, and the Forge Algorithm Lab. Solve it in a few minutes, build a streak, and earn bonus credit along the way.
In-line glossary, highlighter & instant search
Learn chapters now link every technical term to a 135-entry glossary you can check without losing your place, a highlighter to mark up key passages as you read, and a Cmd+K search bar to jump straight to any level, chapter, or blog post.
Highlights and notes that follow you everywhere
Text you highlight while reading now syncs to your account instead of disappearing on refresh, and a new sticky-notes sidebar lets you jot down thoughts as you study.
Filter levels by company & target role
Every lab's level map now shows which real companies like Google, Meta, and Amazon are known to ask a given problem, plus the target seniority from Fresher to Staff+, so you can filter practice down to exactly what your next interview needs.
Engineering Papers
A new reading library breaking down real systems, AI/ML, database, algorithms, and networking papers in plain English, with proper math rendering, for when you want to go deeper than a single lab level.
Certifications for SQL Lab, Forge & AI Lab
Verifiable certificates now cover every lab's newest tracks too, bringing the total to 63 certifications you can complete and share on LinkedIn.
In-app notifications
A new notification bell surfaces account alerts and platform announcements right inside the app, so you don't have to rely on email to catch what's new.
Richer API Design canvas: headers & fallback responses
Endpoints in the API Design Lab can now carry real HTTP headers, like Authorization, Idempotency-Key, and rate-limit headers, plus fallback responses, so your designs capture the details a real production API actually needs.
Weekly Boss Puzzle
Once a week, the Daily Puzzle gets a tougher 'boss' version with a bigger credit bonus for solving it: extra challenge for when the regular puzzle feels too easy.