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Senior Frontend Engineer Interview Questions

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Task Runner with concurrent limit [Javascript] The problem was to complete the add function for Runner class. concurrent limit will determine the number of task Runner can run in parallel. If the concurrent limit is reached by Runner, rest of the tasked should be queued and only to be executed once the first set of task are completed. ------------------------------------------------------------- class Runner { constructor(concurrent) { } add(task) { // Add your code here. } } function task(x) { return function() { return new Promise((resolve, _) => { setTimeout(() => { console.log('task completed', x); resolve(); }, 2000); }) } } runner = new Runner(3); runner.add(task(2)) runner.add(task(2)) runner.add(task(2)) runner.add(task(4)) runner.add(task(4)) runner.add(task(4)) runner.add(task(6)) runner.add(task(6)) runner.add(task(6))
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Senior Frontend Engineer

Interviewed at Miro

3.6★
Jan 5, 2022

Task Runner with concurrent limit [Javascript] The problem was to complete the add function for Runner class. concurrent limit will determine the number of task Runner can run in parallel. If the concurrent limit is reached by Runner, rest of the tasked should be queued and only to be executed once the first set of task are completed. ------------------------------------------------------------- class Runner { constructor(concurrent) { } add(task) { // Add your code here. } } function task(x) { return function() { return new Promise((resolve, _) => { setTimeout(() => { console.log('task completed', x); resolve(); }, 2000); }) } } runner = new Runner(3); runner.add(task(2)) runner.add(task(2)) runner.add(task(2)) runner.add(task(4)) runner.add(task(4)) runner.add(task(4)) runner.add(task(6)) runner.add(task(6)) runner.add(task(6))

taskRunner.add(logAfterDelay("Delayed by 4")); taskRunner.add(logAfterDelay("Delayed by 4")); taskRunner.add(logAfterDelay("Delayed by 4")); taskRunner.add(logAfterDelay("Delayed by 6")); taskRunner.add(logAfterDelay("Delayed by 6")); taskRunner.add(logAfterDelay("Delayed by 6")); // --- Helpers --- const startingTime = Date.now(); function logAfterDelay(logString) { return () => { return new Promise((resolve, reject) => { setTimeout(() => { console.log(logString, getDelay(startingTime)); resolve(); }, 2000); }); }; } function getDelay(startingTime) { return [${Math.round((Date.now() - startingTime)/1000)}s delay]; }
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Senior Frontend Engineer

Interviewed at Miro

3.6★
Jan 25, 2022

taskRunner.add(logAfterDelay("Delayed by 4")); taskRunner.add(logAfterDelay("Delayed by 4")); taskRunner.add(logAfterDelay("Delayed by 4")); taskRunner.add(logAfterDelay("Delayed by 6")); taskRunner.add(logAfterDelay("Delayed by 6")); taskRunner.add(logAfterDelay("Delayed by 6")); // --- Helpers --- const startingTime = Date.now(); function logAfterDelay(logString) { return () => { return new Promise((resolve, reject) => { setTimeout(() => { console.log(logString, getDelay(startingTime)); resolve(); }, 2000); }); }; } function getDelay(startingTime) { return [${Math.round((Date.now() - startingTime)/1000)}s delay]; }

Take home task was standard client side frontend application consuming a public API. Shared deployed url and code via GitHub. Code was reviewed in isolation (no chance for feedback / address issues) by a less experienced frontend developer (which fits with why they are trying to fill this role). Feedback indicated that the reviewer was unable to understand interesting code design choices and instead made incorrect or basic comments e.g. "split into more files".
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Senior Frontend Engineer

Interviewed at Synthesia

4.4★
Sep 20, 2023

Take home task was standard client side frontend application consuming a public API. Shared deployed url and code via GitHub. Code was reviewed in isolation (no chance for feedback / address issues) by a less experienced frontend developer (which fits with why they are trying to fill this role). Feedback indicated that the reviewer was unable to understand interesting code design choices and instead made incorrect or basic comments e.g. "split into more files".

Round 1 - Coding - 1 hour - Asked to make a generic undo/redo state management system. I solved the problem using callbacks and completed the solution. At the end, we discussed a better approach would have been using custom hooks. I appreciated the feedback, and we had a good conversation. The interviewer had clear thoughts and great communication skills. Result - Moved to the next round.
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Senior Frontend Engineer

Interviewed at Prophecy

3.6★
Oct 10, 2024

Round 1 - Coding - 1 hour - Asked to make a generic undo/redo state management system. I solved the problem using callbacks and completed the solution. At the end, we discussed a better approach would have been using custom hooks. I appreciated the feedback, and we had a good conversation. The interviewer had clear thoughts and great communication skills. Result - Moved to the next round.

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