Senior Backend Developer Interview Questions

745 senior backend developer interview questions shared by candidates

Cod assignment: They asked me to create a web server with three math APIs(e.g. Fibonacci, ...) and to log the runtime of APIs, they gave me a review about my code, that the logger that I implemented is not efficient and so simple, but the point is that when I received the code assignment, I asked them about how do they need the logger to be implemented, is it OK to just write a simple custom logger or there are some other expectations that need to be satisfied, and they told me that I can write a custom one
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Senior Python Backend Developer

Interviewed at Klarna

3.1
Sep 15, 2021

Cod assignment: They asked me to create a web server with three math APIs(e.g. Fibonacci, ...) and to log the runtime of APIs, they gave me a review about my code, that the logger that I implemented is not efficient and so simple, but the point is that when I received the code assignment, I asked them about how do they need the logger to be implemented, is it OK to just write a simple custom logger or there are some other expectations that need to be satisfied, and they told me that I can write a custom one

In this case you are tasked with designing and building a simple off-chain system and the on-chain smart-contract to enable cheap auctions. The goal is to enable trades between an ERC721 and a ERC20 with a single on-chain transaction. The auctions should work as follows: - Owner of the NFT approves all NFT’s to the Marketplace - Owner of the NFT signs to create an off-chain auction listing with a minimum price - Bidder approves ERC20 tokens to Marketplace - Bidder signs a bid for the auction - If owner approves the bid, signs it back and retrieve to bidder - Anyone with both signatures can settle the transaction, the owner takes the ERC20 whilst the bidder takes the NFT.
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Senior Blockchain Backend Developer

Interviewed at Rather Labs

3.8
Aug 22, 2022

In this case you are tasked with designing and building a simple off-chain system and the on-chain smart-contract to enable cheap auctions. The goal is to enable trades between an ERC721 and a ERC20 with a single on-chain transaction. The auctions should work as follows: - Owner of the NFT approves all NFT’s to the Marketplace - Owner of the NFT signs to create an off-chain auction listing with a minimum price - Bidder approves ERC20 tokens to Marketplace - Bidder signs a bid for the auction - If owner approves the bid, signs it back and retrieve to bidder - Anyone with both signatures can settle the transaction, the owner takes the ERC20 whilst the bidder takes the NFT.

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