Senior Frontend Developer Interview Questions

1,358 senior frontend developer interview questions shared by candidates

Razor Labs Full Stack - Home Exercise Background We are going to build a system that manages machine insights. The system is responsible for uploading new insights and searching for existing ones. Task 1. Create a web server that supports 2 functionalities (with Python & FastAPI): a. Create a new insight: i. Input 2. 3. ii. Output 1. 1. created_at (datetime) type (one of the following: bearing/gear/motor) severity (one of the following: healthy/alarm/critical) diagnostic_id (uid) - the id of the diagnostic that was created b. Get insights: i. Input 1. from_date (datetime) ii. Output 1. list of all the diagnostics information from the given date until now 2. Create a dashboard that utilizes the web server capabilities (React) a. The design is defined in Zeplin project: i. User: razor-ex@razor-labs.com ii. Pass: RazorEx1337 b. Table i. Diagnostics should be sorted by date and then by severity c. Fusion trend graph: i. On each day the most severe diagnostic will be displayed (if there are several diagnostics, just choose one) ii. On hover, a tooltip should be shown next to the point with the fault type (currently in the design it shows the severity) iii. You can choose any tool you want to create the graph - the layout does not have to be the same in this case d. Add new diagnostic: i. Add basic validation on the front General guidelines: 1. 2. 3. No need to set up a real DB, you can just use an in-memory mock. Implement a few tests to verify your work. This about the code readability, and complexity (years of diagnostics). Delivery: 1. 2. Your code and installed libraries. A short video (30 seconds) that shows the dashboard functionality in your environment if u applying for frontend do only the second part
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Senior Frontend Developer

Interviewed at Razor Labs

3.5
May 4, 2025

Razor Labs Full Stack - Home Exercise Background We are going to build a system that manages machine insights. The system is responsible for uploading new insights and searching for existing ones. Task 1. Create a web server that supports 2 functionalities (with Python & FastAPI): a. Create a new insight: i. Input 2. 3. ii. Output 1. 1. created_at (datetime) type (one of the following: bearing/gear/motor) severity (one of the following: healthy/alarm/critical) diagnostic_id (uid) - the id of the diagnostic that was created b. Get insights: i. Input 1. from_date (datetime) ii. Output 1. list of all the diagnostics information from the given date until now 2. Create a dashboard that utilizes the web server capabilities (React) a. The design is defined in Zeplin project: i. User: razor-ex@razor-labs.com ii. Pass: RazorEx1337 b. Table i. Diagnostics should be sorted by date and then by severity c. Fusion trend graph: i. On each day the most severe diagnostic will be displayed (if there are several diagnostics, just choose one) ii. On hover, a tooltip should be shown next to the point with the fault type (currently in the design it shows the severity) iii. You can choose any tool you want to create the graph - the layout does not have to be the same in this case d. Add new diagnostic: i. Add basic validation on the front General guidelines: 1. 2. 3. No need to set up a real DB, you can just use an in-memory mock. Implement a few tests to verify your work. This about the code readability, and complexity (years of diagnostics). Delivery: 1. 2. Your code and installed libraries. A short video (30 seconds) that shows the dashboard functionality in your environment if u applying for frontend do only the second part

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