Zeta Software Development Engineer II Interview Questions and Answers

Q1. HashSet Internal Implementation and sort the elements in a hashset
Ans. 
HashSet is implemented using a hash table. Elements are not sorted in a HashSet.
• HashSet is implemented using a hash table data structure.

• Elements in a HashSet are not sorted, as they are stored based on their hash code.

• To sort elements in a HashSet, you can convert it to a List and then sort the List.
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Q2. Find number of employees under every manager, coding
Ans. 
Use a hierarchical query to find the number of employees under each manager.
• Use a recursive query to traverse the organizational hierarchy

• Count the number of employees under each manager

• Group the results by manager
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Q1. Design a system that allows the onboarding of new financial instruments defined by user-set limits, which may include daily amounts and transaction counts. Please outline two processes: 1. The onboarding p...read more
Ans. 
Design a system for onboarding financial instruments with user-defined limits for transactions and daily amounts.
• Onboarding Process: Define a user interface for inputting financial instrument details, such as name, type, daily limit, and transaction count.

• Validation: Implement validation checks to ensure limits are within acceptable ranges (e.g., daily amount must be > 0).

• Storage: Store the financial instrument deta...read more
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Q2. How can a series of unique random numbers be generated efficiently without any repetitions?
Ans. 
Efficiently generating unique random numbers can be achieved using algorithms and data structures that ensure no repetitions occur.
• Use a Set: Store generated numbers in a Set to automatically handle duplicates. Example: `Set<Integer> uniqueNumbers = new HashSet<>();`

• Shuffle an Array: Create an array of numbers and shuffle it. Example: `Collections.shuffle(Arrays.asList(numbers));`

• Random Sampling: Use random...read more
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Q3. The Gas Station problem involves a circular route where you must determine if there is a starting gas station from which you can travel around the circuit once without running out of gas. You are given two...read more
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Q4. What is idempotency?
Ans. 
Idempotency is a property of operations where performing them multiple times has the same effect as performing them once.
• In HTTP methods, GET and PUT are idempotent; calling them multiple times yields the same result.

• For example, calling a DELETE operation on a resource multiple times will not change the outcome after the first call.

• Mathematically, a function f(x) is idempotent if f(f(x)) = f(x).

• In databases, setting a...read more
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Q5. What are functional Interfaces? Lambdas?
Ans. 
Functional interfaces are single abstract method interfaces in Java, enabling lambda expressions for concise code.
• A functional interface has exactly one abstract method.

• They can have multiple default or static methods.

• Example: Runnable (void run()), Comparator (int compare(T o1, T o2)).

• Lambdas provide a clear and concise way to represent a method interface using an expression.

• Example of a lambda: (x, y) -> x + y for...read more
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Q6. What is CAP theorem?
Ans. 
CAP theorem states that a distributed data store can only guarantee two of three properties: Consistency, Availability, and Partition Tolerance.
• Consistency: All nodes see the same data at the same time. Example: A bank transaction must be consistent across all branches.

• Availability: Every request receives a response, either success or failure. Example: A web service that is always online.

• Partition Tolerance: The system...read more
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Round : DSA
Duration : 1 hr
No. of Questions : 1 (medium - hard LC)
type : F2F
tool : Google Docs

Round : LLD
Duration : 1hr30mins
No.of Questions : 1 (medium)
type : F2F
tool : any IDE
(for me, Vehicle parking was asked)

Q1. Round : HM Duration : 1hr General discussion on current work & quick LLD question for which pseudo code & design was asked
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Q2. Design People Management system
Ans. 
Design a system to manage people
• Identify the roles and responsibilities of people in the organization

• Create a database to store employee information

• Develop a user interface for employees to update their information

• Implement a system for managers to approve employee requests

• Integrate with payroll and benefits systems

• Ensure data security and privacy
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Q3. Architecture of the current product
Ans. 
The current product follows a microservices architecture.
• The product is divided into multiple independent services.

• Each service has its own database and communicates with other services through APIs.

• The architecture allows for scalability and flexibility.

• Examples of services include user management, payment processing, and inventory management.
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