Delhivery Software Developer Intern Interview Questions, Process, and Tips

RESTful API is an architectural style for designing networked applications

• REST stands for Representational State Transfer

• Uses standard HTTP methods like GET, POST, PUT, DELETE

• Resources are identified by URIs

• Stateless communication between client and server

• Responses are typically in JSON or XML format

I am a software developer with 5 years of experience in Java and Python.

• Experienced in Java and Python programming languages

• Worked on various projects involving web development and data analysis

• Familiar with Agile methodologies and version control systems like Git

Dynamic Programming problem involving finding the maximum sum of non-adjacent elements in an array.

• Use dynamic programming to keep track of the maximum sum at each index.

• At each index, the maximum sum is either the current element plus the sum two indices back, or the sum at the previous index.

• Example: For array [2, 4, 6, 2, 5], the maximum sum of non-adjacent elements is 13 (2 + 6 + 5).

Find the longest common prefix among an array of strings.

• Iterate through the characters of the first string and compare with other strings

• Return the prefix when characters don't match or reach end of any string

• Example: Input - ['flower', 'flow', 'flight'], Output - 'fl'

LRU cache is a data structure that stores the most recently used items.

• Use a doubly linked list to keep track of the order of items based on their usage.

• Use a hashmap to quickly access items in the cache.

• When a new item is accessed, move it to the front of the linked list.

• If the cache is full, remove the least recently used item from the end of the linked list.

I am a Senior Software Engineer with 8 years of experience in developing web applications using Java, Spring, and Angular.

• 8 years of experience in software development

• Proficient in Java, Spring, and Angular

• Strong problem-solving skills

• Experience in leading development teams

• Passionate about learning new technologies

Build a digital stopwatch using HTML, CSS, and JS

• Create HTML structure with buttons for start, stop, and reset

• Use CSS to style the stopwatch display

• Implement JS logic to start, stop, and reset the stopwatch

As a Senior Software Engineer, my day-to-day work involves designing and developing software solutions, collaborating with team members, troubleshooting issues, and staying updated on industry trends.

• Designing and developing software solutions based on project requirements

• Collaborating with team members to discuss project progress and brainstorm solutions

• Troubleshooting and debugging code to fix issues and improve perf...read more

Horizontal scaling involves adding more machines to distribute load, while vertical scaling involves increasing the power of existing machines.

• Horizontal scaling adds more machines to handle increased load

• Vertical scaling increases the power of existing machines

• Horizontal scaling is more cost-effective and easier to implement

• Vertical scaling may have limitations in terms of hardware capabilities

• Examples: Horizontal sca...read more

Load balancer distributes incoming network traffic across multiple servers, while API gateway manages API traffic.

• Load balancer operates at the network layer, distributing traffic based on algorithms like round-robin or least connections.

• API gateway operates at the application layer, providing features like authentication, rate limiting, and caching for APIs.

• Load balancer can balance traffic for any type of application...read more

Identifying and solving race conditions involves understanding concurrent execution and implementing synchronization mechanisms.

• Understand the critical sections of code where race conditions can occur

• Use synchronization mechanisms like locks, semaphores, or atomic operations to control access to shared resources

• Implement thread-safe data structures or use thread-safe libraries to avoid race conditions

• Use tools like sta...read more

Find the third largest element in an unsorted array of strings.

• Sort the array in descending order.

• Remove duplicates if necessary.

• Return the element at index 2 as the third largest.