JavaScript: The Hard Parts, v2 vs Full Stack for Front-End Engineers, v3

Goes deep on the JavaScript runtime model — thread of execution, the call stack, closure, the event loop, Promises and prototypes/classes — across roughly 6.5 hours. Reviewers consistently say it explains how JavaScript works "under the hood" rather than just syntax.

Will Sentance (Codesmith founder) is the most-praised element. Learners cite his blackboard diagrams, the "backpack" analogy for closure, and a Socratic, audience-paced delivery. The same intense, repetitive style is the one thing a minority find tiring.

Requires a $39/month Frontend Masters subscription rather than a one-time purchase — strong value if you use the wider catalog, weaker if you only want this one course. The course is included in the standard subscription.

This is a conceptual, exercise-and-whiteboard course, not a project build. There is no portfolio-worthy capstone, which some learners miss. The exercises are effective for drilling mental models but produce no artefact.

The mental models — call stack, closure, the event loop, async behaviour — directly explain bugs developers hit daily. Experienced developers report the course clarified concepts they had used for years without fully understanding.

Across roughly 8 hours, the course covers the parts of full-stack work front-end devs usually skip — the command line, VPS setup, DNS, Nginx, SSH, firewalls, HTTPS/TLS, WebSockets, CI/CD and Docker. Reviewers repeatedly praise the breadth and how it covers "usually ignored parts" of the path without overwhelming.

Jem Young (Engineering Manager at Netflix) is consistently described as clear, fun to watch, and good at making infrastructure concepts accessible. The Netflix war stories sprinkled throughout are a recurring highlight. Delivery is the most-praised element after breadth.

Requires a Frontend Masters subscription (~$39/month, ~$390/year) rather than a one-time purchase. Strong value if you use the wider catalog, weaker if you only want this one course. Reviewers call the membership pricey but generally justified by the production quality.

You build and deploy a real working application on a live VPS end to end — a genuine, portfolio-relevant artefact rather than a toy. The catch is that infrastructure you provision (a paid Droplet, a domain) costs real money to follow along, and the build is breadth-first rather than a polished product.

This is the course's strongest dimension. The skills — provisioning a server, configuring Nginx, setting up CI/CD, containerising with Docker, hardening with a firewall and TLS — map directly to production tasks front-end engineers hit the moment they own deployment.