Oportun Senior Software Engineer Interview Questions and Answers

Angular has a life cycle consisting of several phases that a component goes through from creation to destruction.

• Angular components go through several life cycle hooks such as ngOnInit, ngOnDestroy, etc.

• ngOnInit is called after the component has been initialized and its data-bound properties have been checked.

• ngOnDestroy is called just before the component is destroyed.

• Other life cycle hooks include ngOnChanges, ngDoCheck, ngAfterContentInit, ngAfterContentChecked, ngAfterVie...read more

Implement a dynamic programming solution for stock buy and sell problem.

• Use dynamic programming to find the maximum profit by buying and selling stocks.

• Keep track of the minimum stock price seen so far and update the maximum profit accordingly.

• Consider edge cases like no profit or negative profit.

• Example: Input [7, 1, 5, 3, 6, 4], Output 5 (buy at 1, sell at 6)

CAP Theorem states that in a distributed system, it is impossible to simultaneously achieve consistency, availability, and partition tolerance.

• Consistency: All nodes in the system have the same data at the same time.

• Availability: Every request gets a response, even if some nodes are down.

• Partition Tolerance: The system continues to operate despite network partitions.

• Examples: MongoDB prioritizes consistency and partition tolerance, while Cassandra prioritizes availability and...read more

DynamoDB is a fully managed NoSQL database service provided by AWS, designed for high performance and scalability.

• DynamoDB is schema-less, allowing for flexible data models

• It offers high availability and durability through replication and automatic backups

• DynamoDB uses primary keys for data retrieval, with optional secondary indexes for querying

• It supports ACID transactions for consistency and reliability

• DynamoDB is designed for low-latency and high-throughput applications

Java 8 stream setup involves creating a stream from a collection or array and applying operations like filter, map, and reduce.

• Create a stream from a collection using stream() method

• Apply operations like filter, map, and reduce to process elements

• Use terminal operations like collect or forEach to get the final result