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      Firstsource Solutions

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      Firstsource Solutions interviewsFirstsource Solutions Senior Frontend Developer-React JS interviewsFirstsource Solutions interview


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      Senior Frontend Developer-React JS Interview

      25 Jul 2023
      Anonymous interview candidate
      No offer
      Negative experience
      Average interview

      Application

      I applied through other source. The process took 4 weeks. I interviewed at Firstsource Solutions

      Interview

      It was the worst interview process I have faced so far. They took total of 4 rounds (purely technical). In the start, HR said there will be 3 rounds & then later added one more round. Round 2 was taken by two people, both technical Round 3 was also taken by two people (technical + manager) Round 4: technical + some other manager I could clear all 3 rounds and was also confident about the final round. one manager said that they need someone who can do full-stack JS (React.js, Node.js, GraphQL, TypeScript) & work in Java as well. (😮while JD said React.js profile) I waited for the feedback but they didn't reply. I then followed up with the HR person, he said he will update by EOD. I again waited for another 2 days but didn't receive any response. Again I called HR to follow up, he said the job position had been put on hold.😢 I felt very bad because I was genuinely interested & prepared for every round.

      Interview questions [4]

      Question 1

      React.js, TypeScript, JavaScript, GraphQL - What is pureComponent ? - lifecycle methods - hooks - diff between useEffect & useLayoutEffect - portals - how do you make API calls - refs in React, when are they used ? - error handling - what is prop drilling ? - difference b/w createElement() & cloneElement - React Router Authentication & Authorization - how do you handle browser incompatibilities GraphQL: - what are benefits of using GraphQL - GraphQL queries & mutation - multiple queries in one request - REST API request methods GET, POST, PUT, PATCH, DELETE - error handling TypeScript - getter & setters - generics in TS - declare in TS, namespace - classes in TS - assert in TS
      Answer question

      Question 2

      small machine coding assignment, which you have do live on online IDE (React.js)
      1 Answer

      Question 3

      - How do you make issue queries/mutations to a graphql server - how do you create graphql server ? What things you need ? - What is directive in graphql ? What is Fragment in GraphQL ? - How do you write unit tests for your Queries/Mutation (on server side) - TypeScript basics - Partial in TS - Decorators - union & discriminating unions - What are Generics in TS ? simple example - useCallback vs useMemo - call parent func from child component in React
      Answer question

      Question 4

      - array sorting & merging [medium level] - find unique elements from array - sort array of object
      Answer question