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“This course not only fully illuminated Flexbox and CSS Grid for me, but made me LOVE CSS. Jonas feels like a trusted friend who goes through the process with you.”

“I have to say that this is the best course I have ever taken. It is incredibly detailed, and Jonas is excellent at explaining things with great care and precision.”

“Jonas teaches Javascript. Like many others, but he does it for real. Not only he knows Javascript to an advanced level because he's very passionate about it, but also he's an exellent teacher. It's literally perfection. It literally gave me all the tools and knowledge that not even a CS university gave me.”

“Excellent course, I got a job as a software engineer at the age of 17 with this.”

“I would say that Jonas is on another level, but that would not be fair, Jonas is on another planet. The diagrams that he has put together explaining concepts, are worth the money that I paid for the course by themselves. I previously took another JS course that was made by a YouTuber, and Jonas's is much, much better.”

“Jonas is one of the few courses that really go in depth about planning your application. For example, what objects/data structures do we need? How do I break down my complex and complicated app down to manageable pieces to avoid coupling the code? I felt many courses don't emphasize this crucial skill enough. Even my university courses do not teach this crucial skill despite it being probably one, if not the most important skill for career relevant skills.”

“I feel confident about my knowledge and ability to write JavaScript code, because Jonas explains everything, so it's really clear what am I doing, why am I doing it this way, and how it works behind the scenes.”

“In one word? Thorough. The level of details and considerations presented is incredible, way ahead any other course out there. If you really want to step up your game, I can't think of a better course, this is THE ONE.”

“Jonas has put a lot of efforts in this course and it shows. Quality of the content is fantastic., there is a lot of excellent material including theory and optional sessions. He explains how things work behind the scene and what the best practices are. Some of the advance concepts are explained beautifully over here, which I had hard time finding out on the web.”

“This course is truly exceptional. Jonas does an excellent job of explaining and coaching you through the project that you build. I'm gaining a huge understanding of backend coding and feeling very solid about NodeJS.”

“Very detailed explanation! I was amazed by the way Jonas teaches difficult concepts in such a simple way!”

“This course is leagues above any other of its kind. The instructor is amazing, he covers the topics really well.”

“It's unbelievable just how much information is packed into this course. Hands down, this is by far the best Node.js / Express / MondoDB / Mongoose course on Udemy and it's not even close. You won't get any better value for your money than this.”

“Epic. Epic. Epic. No words can be enough to describe this course. I mean projects are crafted nicely, gave us tireless explanations and covered so much stuffs of how to architect and build frontend projects + take you through theories, complex topics of react, next, redux, advanced design patterns etc. in such a way that you never feels bored, that just his teaching style is + lots of challenges of course and above all genius explanations of behind the scenes of React, RSC, SSR, SSG, hydration, Caching, Performance Optimization, Data Fetching and so on.”

“Coming from a non-CS background, I owe a lot to Jonas's courses. His guidance helped me land a job in a company and even succeed as a Top Rated Seller on Fiverr.”

“I've taken several online courses, but Jonas's React course truly stands out for its depth and clarity. Jonas has a unique ability to explain complex ideas in a simple, engaging way. The structured curriculum, real-world projects, and step-by-step guidance help solidify each concept.”

“I used to work with React for a period of time before enrolling this course, but this course was an absolute game changer for me while using React. The course is well-structured, well-prepared, not only focusing on the technical side, but also how to think as a developer working in a real business and how to gather system requirements and break it down into features.”