Automatic Data Processing (ADP) Senior Software Engineer Interview Questions and Answers

Q1. Opps, overloading and overriding, factory n singleton patteren
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Q2. Collections HashMap internal working
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Q1. Write polyfill for array map
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Q1. Get minimum from stream. Query based.
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Q2. Minimum number of platforms for trains. Arrival n departure time is given.
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Q1. Design Instagram feed
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Designing Instagram feed involves displaying user's photos and videos in a visually appealing and user-friendly manner.
• Display user's posts in a grid layout with images/videos and captions

• Allow users to like, comment, and share posts

• Implement infinite scrolling to load more posts as user scrolls down

• Include a search bar to search for specific users or hashtags
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A code to identify errors and write Junit. Optimise the code as well.

Q1. Stacks using queue
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Implementing a stack using two queues
• Use two queues to simulate a stack

• Push operation: Enqueue the element to queue 1

• Pop operation: Dequeue all elements from queue 1 to queue 2, dequeue the last element from queue 1, then swap the queues

• Top operation: Return the front element of queue 1

• Example: Push 1, 2, 3 - Queue 1: [1, 2, 3], Queue 2: []

• Example: Pop - Queue 1: [1, 2], Queue 2: [3]
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Q2. BFS and Knapsack problem, previous project experience
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Q1. Git branching strategy
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Q2. Use of git revert
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Git revert is used to undo changes made in a commit by creating a new commit that undoes the changes.
• Git revert is used to undo changes made in a specific commit without altering the commit history.

• It creates a new commit that undoes the changes introduced by the specified commit.

• Git revert is useful for reverting changes without losing the commit history or affecting other team members' work.

• Example: git revert
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Q3. Merging process
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Q1. Jenkis node , what is the use
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Jenkins node is a machine that executes tasks as part of a Jenkins build process.
• Jenkins nodes can be physical machines or virtual machines.

• Nodes can be configured to run specific types of jobs or tasks.

• Nodes help distribute workload and improve efficiency in Jenkins pipelines.
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Q2. How do we name to the node
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Nodes can be named based on their functionality, purpose, or position in a hierarchy.
• Name based on functionality (e.g. loginNode, paymentNode)

• Name based on purpose (e.g. validationNode, processingNode)

• Name based on position in hierarchy (e.g. parentNode, childNode)
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Q3. What are the plugins used in jenkins
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Jenkins has a wide range of plugins for various functionalities.
• Pipeline plugins (e.g. Pipeline, Multibranch Pipeline)

• SCM plugins (e.g. Git, SVN)

• Build and test plugins (e.g. Maven, JUnit)

• Notification plugins (e.g. Email, Slack)

• Monitoring plugins (e.g. Prometheus, Grafana)
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Q4. What is jenkins library
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Jenkins library is a collection of reusable code that can be shared across multiple Jenkins pipelines.
• Jenkins library allows for code reuse and sharing across pipelines

• It helps in maintaining consistency and reducing duplication of code

• Libraries can be stored in version control systems like Git and referenced in Jenkins pipelines
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Q5. How we integrate other tools to jenkins
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Integrating other tools to Jenkins involves using plugins and configuring build pipelines.
• Install the necessary plugins for the tools you want to integrate with Jenkins

• Configure the tools in Jenkins global configuration settings

• Create build pipelines that include steps for interacting with the integrated tools

• Use Jenkins API to automate interactions with external tools
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Q6. What else jenkins do
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Q7. Diff b/w docker and docker swarm
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Docker is a containerization platform for running applications in isolated environments, while Docker Swarm is a tool for orchestrating multiple Docker containers across multiple hosts.
• Docker is used for creating and managing containers, while Docker Swarm is used for managing multiple containers across multiple hosts.

• Docker is suitable for single host deployments, while Docker Swarm is suitable for multi-host deployme...read more
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Q8. Differentiate k8s from docker swarm
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K8s is a container orchestration tool while Docker Swarm is a clustering and scheduling tool for Docker containers.
• K8s is more widely used and has a larger community support compared to Docker Swarm.

• K8s supports more advanced features like auto-scaling, self-healing, and rolling updates.

• Docker Swarm is easier to set up and manage for smaller scale deployments.

• K8s uses declarative configuration while Docker Swarm uses i...read more
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Q9. Prepare all commands for devops tool must
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Q10. What is git hooks
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Git hooks are scripts that run automatically before or after certain Git commands are executed.
• Git hooks are customizable scripts that can be triggered by specific Git events.

• They can be used to enforce coding standards, run tests, or automate deployment processes.

• Examples of Git hooks include pre-commit, post-commit, pre-push, and post-merge hooks.
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Q11. What is https and ssh cloning
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HTTPS is a secure communication protocol used for secure communication over the internet. SSH cloning is a method of cloning a repository using the SSH protocol.
• HTTPS stands for Hypertext Transfer Protocol Secure and is used to secure communication over the internet.

• It encrypts the data being transmitted between the client and the server, providing a secure connection.

• SSH cloning is a method of cloning a Git repository...read more
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Q1. Personal info only
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Full stack question with java and angular and sql

Case study on project