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Understand what the browser does, learn the primitives that solve recurring frontend problems, and design real systems you can explain and defend.
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Build the UI problems asked in frontend machine coding rounds, each one in vanilla JavaScript and in React, and explain your choices.
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Write the functions asked in JavaScript coding rounds from scratch: debounce and throttle, polyfills, promises and small utilities.
₹399 per year ₹2,999
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All-access pass
Every ThinkFE course for a year, including courses released while your pass is active, such as the planned Machine Coding Round and JavaScript Coding Round.
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Start hereModule 01 · Foundations
DNS, connections, parsing, rendering, and what blocks the waterfall.
Mark an activity reviewed at the end of its page. Closing the browser clears this; sign in to keep it.
Every submodule in order. Open one to read it or to see what it will cover.
Answer from memory first, then check your reasoning in the recap.
1.1How a page loads
Why can a fast server still give a slow first visit?
Answer in the recapThe full path, from browser fundamentals to systems you can explain and defend.
14 submodules
Understand what the browser does, what it costs, and how to measure it.
49 submodules
Learn the small tools that solve recurring frontend problems.
Open module12 submodules
Compose the primitives into a subsystem you can explain and defend.
Open module5 submodules
Turn your reasoning into a clear, structured system-design conversation.
Open module13 submodules
Put the pieces together. Each system introduces a new design challenge.
Open moduleNothing to read yet
Explore the curriculum to see what each submodule will cover.
Explore the full curriculumMark an activity reviewed at the end of its page. Closing the browser clears this; sign in to keep it.
Every submodule in order. Open one to read it or to see what it will cover.
Answer from memory first, then check your reasoning in the recap.
Recall questions appear here once a lesson with a recap is readable.
The full path, from browser fundamentals to systems you can explain and defend.
3 submodules
How machine coding rounds work and how to use the time.
Open module6 submodules
Self-contained widgets with clear state and accessible interaction.
Open module5 submodules
Interfaces built around data that is fetched, filtered and nested.
Open module2 submodules
Larger problems that combine several components and flows.
Open moduleNothing to read yet
Explore the curriculum to see what each submodule will cover.
Explore the full curriculumMark an activity reviewed at the end of its page. Closing the browser clears this; sign in to keep it.
Every submodule in order. Open one to read it or to see what it will cover.
Answer from memory first, then check your reasoning in the recap.
Recall questions appear here once a lesson with a recap is readable.
The full path, from browser fundamentals to systems you can explain and defend.
5 submodules
Functions that wrap other functions and control when they run.
Open module5 submodules
Built-in methods, written by hand.
Open module5 submodules
Asynchronous building blocks, from a promise to a concurrency limit.
Open module3 submodules
Small tools that show up in coding rounds.
Open module
