Deutsche Telekom Digital Labs Interview Questions, Process, and Tips

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
Ans. 
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
Ans. 
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
Ans. 
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. Java8 and multhithreading based questions
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Q2. 1 Leetcode easy question
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Q1. TDD based live coding and spring based question
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Q2. 1 leetcode medium question
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Q1. Salary negotiations and company fit based questions
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Q1. Asked Kadane's algorithm, and some android related questions.
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Q1. Design a hashmap, and optimise it
Ans. 
Design and optimize a hashmap
• Choose a good hash function to minimize collisions

• Implement dynamic resizing to handle increasing load factor

• Consider using open addressing or separate chaining for collision resolution

• Use an efficient data structure for storing key-value pairs, such as an array or linked list
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Q1. Design a custom recyclerview with appropriate data structures
Ans. 
Custom recyclerview with appropriate data structures
• Create a custom adapter extending RecyclerView.Adapter

• Implement onCreateViewHolder() and onBindViewHolder() methods

• Use appropriate data structures like ArrayList or HashMap for efficient data handling

• Implement onClickListener for item clicks

• Use ViewHolder pattern for efficient view recycling
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Q1. What are your expectations related to work and salary
Ans. 
I expect fair compensation for my skills and experience, and a challenging work environment that allows for growth and learning.
• I am looking for a salary that is commensurate with my experience and skills.

• I am open to negotiation and willing to discuss salary and benefits.

• I am looking for a challenging work environment that allows me to learn and grow as a software engineer.

• I am interested in opportunities for professi...read more
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