Deutsche Telekom Digital Labs Interview Questions, Process, and Tips for Experienced

Q1. Skills related questions only
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Q1. Skills related questions only
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Q1. Salary related questions only
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Q1. Have you worked on swift
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Q2. What is a class
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A class is a blueprint for creating objects in object-oriented programming.
• Classes define the properties and behaviors of objects.

• Objects are instances of classes.

• Classes can inherit properties and behaviors from other classes.

• Encapsulation, inheritance, and polymorphism are key concepts in class-based programming.
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Q1. Write code for star paattern
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Code for star pattern using nested loops
• Use nested loops to print the desired pattern

• Outer loop controls the number of rows and inner loop controls the number of stars in each row

• Example: for a pattern with 5 rows, the code would involve two nested loops to print stars in a pyramid shape
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Q2. What is linked list
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A linked list is a data structure where each element is a separate object, connected to the next element by a pointer.
• Consists of nodes where each node contains data and a reference to the next node

• Dynamic in size and can grow or shrink during execution

• Common operations include insertion, deletion, and traversal

• Example: Singly linked list, Doubly linked list, Circular linked list
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Q3. Differnce between public private
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Public and private sectors differ in ownership, funding, and management.
• Public sector is owned and operated by the government, while private sector is owned and operated by individuals or companies.

• Public sector is funded by taxpayer money, while private sector is funded by investors or owners.

• Public sector is managed by government officials, while private sector is managed by business owners or executives.
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Q4. Whats is oops and protcols
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OOPs stands for Object-Oriented Programming and protocols are a set of rules for communication between devices.
• OOPs is a programming paradigm that uses objects and classes to design applications.

• Protocols are a set of rules that define how data is transmitted between devices.

• In OOPs, objects have attributes and methods that define their behavior.

• Examples of OOPs languages include Java, C++, and Python.

• Examples of proto
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Q1. Total time waste quesrtions
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Q2. Basic programing questions as em was having very less knowledge
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Q1. Basic useless question were asked by some non technical person
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Q1. Basic useless questions by non technicial person
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Q1. Designing Scalable system and data structure
Ans. 
Designing scalable systems involves creating efficient data structures to handle large amounts of data and traffic.
• Consider using distributed systems to handle high traffic loads.

• Use data partitioning to distribute data across multiple servers.

• Optimize data structures for quick access and retrieval.

• Implement caching mechanisms to reduce load on the system.

• Regularly monitor and optimize system performance to ensure scal...read more
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Q2. Design a distributed Cache
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Design a distributed Cache
• Use consistent hashing to distribute data across multiple nodes

• Implement replication for fault tolerance

• Consider data eviction policies like LRU or LFU

• Use a distributed coordination service like ZooKeeper or etcd for node coordination
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Q3. Design a storage similar to S3
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Design a scalable and reliable storage system similar to S3.
• Use distributed architecture to handle large amounts of data

• Implement data redundancy and replication for high availability

• Provide a simple API for easy access and management

• Support for different storage classes like standard, infrequent access, and archive

• Include features like versioning, encryption, and lifecycle policies
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Q4. Sorry Array on the basis of alphabetical order of keys
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Sort an array of strings based on alphabetical order of keys
• Use the sort() method with a custom compare function to sort the array alphabetically

• The compare function should compare the keys of the strings using localeCompare() method

• Example: ['banana', 'apple', 'cherry'] should be sorted as ['apple', 'banana', 'cherry']
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Q5. Low level design of UPI system
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The low level design of a UPI system involves defining the architecture, data flow, and components at a detailed level.
• Define the architecture of the UPI system, including client-server communication, data storage, and security measures.

• Identify the different components of the UPI system, such as user interface, payment processing, and database management.

• Specify the data flow within the UPI system, including how user ...read more
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Core Java , DS and Algo

Q1. LLD Spotify only structure
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Q2. Shortest path algorithm
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Shortest path algorithm finds the shortest path between two nodes in a graph.
• Dijkstra's algorithm is a popular shortest path algorithm that uses a priority queue to find the shortest path in a weighted graph.

• A* algorithm is another popular shortest path algorithm that uses heuristics to guide the search towards the goal node.

• Bellman-Ford algorithm is used for finding the shortest path in a graph with negative edge weig
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Q1. Reason for the change
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Q2. What you bring to the table
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Q1. SQL, spark, hadoop, Linux,python
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Q1. System design, real time data ingestion architecture and processing
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Q1. Strength and weakness
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