Ericsson Software Developer Interview Questions, Process, and Tips

Q1. Hashmap implementation
Ans. 
Hashmap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hashmap uses a hash function to map keys to indices in an array.

• Collision handling is important in hashmap implementation.

• Java's HashMap class is a popular implementation of hashmap.

• Example: HashMap map = new HashMap<>();
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Q2. Testing regarding Junits
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Q1. Next five year goals
Ans. 
To become a senior software developer, gain expertise in new technologies, contribute to open source projects, and mentor junior developers.
• Become a senior software developer

• Gain expertise in new technologies

• Contribute to open source projects

• Mentor junior developers
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Q2. Agile methodologies
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Q1. Questions related to Pivoting, Joins, DeadLocks etc.
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Q1. Questions related to Performance Improvements, Best Practices in SQL, ETL Processing, Scenario related questions
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Q1. Non Technical Interview with Line Manager. Personal Info , Previous employment related details
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Easy questions from quant, english and reasoning

Q1. Asked about call flow
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Q2. Explain 3g, 4g, 5g architecture
Ans. 
3G, 4G, and 5G architectures refer to the generations of mobile network technology, each offering faster speeds and improved capabilities.
• 3G (Third Generation) introduced mobile data services like internet browsing and video calling.

• 4G (Fourth Generation) provided faster speeds for data transmission, enabling services like HD video streaming and online gaming.

• 5G (Fifth Generation) offers even faster speeds, lower laten...read more
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Round duration - 15 minutes
Round difficulty - Easy

This was a group discussion round where we were divided into groups of 10 and we had 15 minutes for GD.

Round duration - 60 minutes
Round difficulty - Medium

This is all about how good you are with the fundamentals. Out of 10 I would give it a 6.5 on difficulty.

Q1. 
Reverse the String Problem Statement
You are given a string STR which contains alphabets, numbers, and special characters. Your task is to reverse the string.
Example:
Input:
STR = "abcde"
Output:
"e...read more
Ans. 
This can be done by iterative swapping using two pointers. The first pointer points to the beginning of the string, whereas the second pointer points to the end. Both pointers keep swapping their elements and go towards each other. Essentially, the algorithm simulates the rotation of a string with respect to its midpoint.
Time Complexity : O(n)
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Q2. What is a deadlock?
Ans. 
Deadlock is a situation where a set of processes are blocked because each process is holding a resource and waiting for another resource acquired by some other process.
Deadlock can arise if the following four conditions hold simultaneously (Necessary Conditions) 
Mutual Exclusion: One or more than one resource are non-shareable (Only one process can use at a time) 
Hold and Wait: A process is holding at least o...read more
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Q3. What is a thread?
Ans. 
A thread is a path of execution within a process. A process can contain multiple threads.
There are two types of threads.
User Level Thread
Kernel Level Thread
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Q4. What is the difference between Multiprocessing and Multiprogramming?
Ans. 
1. The availability of more than one processor per system, that can execute several set of instructions in parallel is known as multiprocessing. The concurrent application of more than one program in the main memory is known as multiprogramming.
2. The number of CPU is more than one in multiprocessing. The number of CPU is one in multiprogramming.
3. Multiprocessing takes less time for job processing. Multiprogramming ta...read more
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Q5. Can you explain the process life cycle in an operating system?
Ans. 
Process life cycle in OS is one of the five states in which a process can be starting from the time it has been submitted for execution, till the time when it has been executed by the system. A process can be in any of the following states –
New state
Ready state
Running state
Waiting state
Terminated
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Q6. What are the differences between Windows XP and Windows 7?
Ans. 
1. Worldwide release : 
Windows 7 : October 22, 2009
Windows XP : October 25, 2001
2. Stable release : 
Windows 7 : February 22, 2011
Windows XP : April 21, 2008
3. Kernel type : 
Windows 7 : Hybrid
Windows XP : Hybrid
4. Platform support :
Windows 7 : IA-32 and x86-64
Windows XP : IA-32, x86-64 and Itanium
5. Preceded by : 
Windows 7 : Windows Vista
Windows XP : Windows 2000 , Windows ME
6. Succeeded by :
Windows ...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions on DBMS and Networking mainly.

Q1. What is the difference between RDBMS and DBMS?
Ans. 
1. DBMS stores data as file. RDBMS stores data in tabular form.
2. Data elements need to access individually in DBMS. Multiple data elements can be accessed at the same time in RDBMS.
3. No relationship between data in DBMS. Data is stored in the form of tables which are related to each other in RDBMS.
4. In DBMS, Normalization is not present. In RDBMS, Normalization is present.
5. DBMS does not support distributed databas
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Q2. What is an Object-Oriented Database Management System (OODBMS)?
Ans. 
An object-oriented database (OOD) is a database system that can work with complex data objects — that is, objects that mirror those used in object-oriented programming languages.
In object-oriented programming, everything is an object, and many objects are quite complex, having different properties and methods. An object-oriented database management system works in concert with an object-oriented programming language to...read more
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Q3. How do you find the number of unique values in a SQL database?
Ans. 
To count the number of different values that are stored in a given column, you simply need to designate the column you pass in to the COUNT function as DISTINCT. When given a column, COUNT returns the number of values in that column. Combining this with DISTINCT returns only the number of unique (and non-NULL) values.
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Q4. What is the difference between a hub and a switch in networking?
Ans. 
A Hub is a networking device that allows you to connect multiple PCs to a single network, whereas a Switch connects various devices together on a single computer network.
A Hub operates on the physical layer, whereas Switch operates on the data link layer.
Hub uses Half-duplex cable on the other hand Switch uses Full duplex cables
Hub is a passive device while the switch is an active device
Hub uses electrical signal orbit
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Q5. Can you explain the different OSI layers?
Ans. 
Physical Layer
The lowest layer of the OSI Model is concerned with electrically or optically transmitting raw unstructured data bits across the network from the physical layer of the sending device to the physical layer of the receiving device. It can include specifications such as voltages, pin layout, cabling, and radio frequencies.

Data Link Layer
At the data link layer, directly connected nodes are used to perform nod...read more
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Q6. What are the different protocols supported at each OSI layer?
Ans. 
Layer 7 Application SMTP, HTTP, FTP, POP3, SNMP
Layer 6 Presentation MPEG, ASCH, SSL, TLS
Layer 5 Session NetBIOS, SAP
Layer 4 Transport TCP, UDP
Layer 3 Network IPV5, IPV6, ICMP, IPSEC, ARP, MPLS.
Layer 2 Data Link RAPA, PPP, Frame Relay, ATM, Fiber Cable, etc.
Layer 1 Physical RS232, 100BaseTX, ISDN, 11.
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Round duration - 15 minutes
Round difficulty - Easy

IF you make it to the HR round you are selected. All 28 that attended got selected . It was more like stuff for formality. The usual questions.