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Top 25 UST Global Technical Interview Questions and Answers

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UST Global is one of the largest technology providers in the world and has been providing technical solutions to some of the world’s largest companies since its inception in 1998. With a strong focus on innovation, UST Global has positioned itself as a leader in the field of technology. With its wide array of services, the company has been able to provide technical solutions to a wide array of customers, from small businesses to Fortune 500 companies.

As a technical company, UST Global has a rigorous hiring process that involves several rounds of technical interviews. These interviews are designed to test a potential candidate’s knowledge and skills in the area of technology. Potential candidates should be well prepared for the technical interview in order to be successful.

Job Interview

This blog will discuss some of the most commonly asked UST Global Technical Interview Questions & Answers. We will provide an overview of the types of questions that you are likely to be asked and how you should answer them. We will also discuss some tips and tricks to help you prepare for the technical interviews and ultimately secure a job with UST Global.

Finally, we will also provide a comprehensive list of the best resources to help you practice for the UST Global technical interview. These resources will include tutorials, practice questions, and sample answers. By preparing in advance, you can increase your chances of success and eventually earn a job with UST Global.

Overview of UST Global Technical Interview Process

UST Global is a leading provider of IT services and solutions that enables its customers to create better businesses. Their technical interview process is an important part of the hiring process, and is designed to ensure that candidates have the necessary skills and experience to join their team.

The technical interview process begins with an initial phone screening, where the hiring managers will ask basic questions about the candidate’s qualifications and experience. This is followed by a technical interview which is generally conducted via a video call. During this interview, the hiring manager will ask more detailed questions about the candidate’s technical skills and experience with various technologies or programming languages. They may also ask questions about the candidate’s approach to problem- solving and their ability to troubleshoot complex issues.

UST Global also utilizes coding challenges as part of their technical interview process. These challenges involve writing code to solve problems and typically involve data structures and algorithms. The candidate’s ability to identify efficient solutions to these problems is evaluated.

Finally, the technical interview process involves an in- person interview, where the candidate is asked more in- depth questions about their technical skills and experience. This is usually followed by a practical test, where the candidate is given a real- world problem to solve or a set of tasks to complete. This is an opportunity for the candidate to demonstrate their knowledge and skills.

Overall, UST Global’s technical interview process is designed to identify the best technical talent for their team. It is a rigorous process, but is designed to ensure that the best candidates are hired.


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Top 25 UST Global Technical Interview Questions and Answers

1. What is a Software Development Life Cycle (SDLC)?

A software development life cycle (SDLC) is a set of processes and activities that software developers follow to create, deploy and maintain software systems. The SDLC typically consists of five phases: planning, analysis, design, implementation and maintenance. During the planning phase, developers identify the requirements and scope of the project. During the analysis phase, they analyze the requirements and develop a plan to develop the software. During the design phase, they create a prototype of the software and begin the actual coding. During the implementation phase, they test out and deploy the software. Finally, during the maintenance phase, they monitor the performance of the software, fix any bugs and continually optimize the software.

2. What is the difference between a waterfall model and an incremental model?

The major difference between a waterfall model and an incremental model is that the waterfall model follows a sequential development process, while the incremental model follows an iterative development process. In the waterfall model, each phase of the project is completed before the next phase begins. This means that projects are completed in stages, and the output of each stage is used as the input for the next. In an incremental model, on the other hand, all phases of the project are completed simultaneously. This means that the project is developed in small pieces and that each iteration builds upon the previous one. This allows for more flexibility and faster feedback on the project.

3. What is a use case diagram?

A use case diagram is a graphical representation of the interactions between actors and the system. It is used to model the functionality of a system by representing its functionality in terms of actors, use cases, and relationships between them. An actor is any entity (person or system) that interacts with the system, while a use case is an interaction between an actor and the system that produces a result of value to the actor. The use case diagram is a visual representation of how the actors interact with the system, and it often includes arrows showing the direction of the interaction.

4. What is a thread?

A thread is a single process in a program that has its own path of execution. Threads are generally used to improve the performance of a program by allowing multiple tasks to be executed at the same time. Each thread has its own memory space, so it can execute its own instructions independently from other threads. Threads can also be used to ensure that the program runs in a more organized way, since each thread can perform a specific task that is related to the overall goal of the program.

5. What is a data structure?

A data structure is a way of organizing data in memory so that it can be efficiently accessed and manipulated. Common data structures include linked lists, stacks, queues, trees, heaps, and arrays. Each data structure has its own set of algorithms that can be used to access and manipulate the data stored in the structure. Different data structures are used for different applications, depending on the particular needs of the program. For example, linked lists are often used for memory management, while stacks are often used for storing data temporarily.

6. What is polymorphism?

Polymorphism is a feature of object-oriented programming languages that allows programmers to create objects with different properties and behaviors. It allows for code reuse, since a single object can act like multiple objects, depending on the context. The most common type of polymorphism is object-oriented polymorphism, which allows objects to be treated as though they are of different types depending on the context. For example, an object could behave one way when connecting to a database, and a different way when connecting to a web server.

7. What is a database?

A database is an organized collection of data that is stored in a computer system. Databases are used to store large amounts of data that can be accessed and manipulated quickly and easily. Common databases include relational databases such as Oracle, Microsoft SQL Server, and MySQL, as well as NoSQL databases such as MongoDB and Cassandra. Databases are used in almost every system, from web applications to banking systems.

8. What is an API?

An API (Application Programming Interface) is a set of protocols, routines, and tools for building software applications. It acts as an interface between different software programs, allowing them to communicate and exchange data with each other. APIs are used for a variety of purposes, such as providing access to a web service, allowing programs to access databases, and providing access to hardware features.

9. What is a stack?

A stack is a data structure that stores data in a Last In First Out (LIFO) manner. It is a linear structure, where data is added to the top of the stack, and data is removed from the top. This means that the last item added to the stack is always the first item to be removed. Stacks are often used to store temporary data, such as function parameters and return addresses during a function call.

10. What is an algorithm?

An algorithm is a well-defined set of instructions that can be used to solve a problem or achieve a desired result. Algorithms are usually expressed in a language that is easily understood by humans, such as pseudocode or a programming language. Algorithms can be used for a variety of tasks, such as sorting and searching data, making decisions, and computing mathematical functions.

11. What is a linked list?

A linked list is a data structure that consists of a sequence of nodes. Each node has a value and a pointer that points to the next node in the list. Linked lists are used for a variety of tasks, such as creating collections of items, storing data in a specific order, and sorting data. They are often used in the implementation of stacks and queues.

12. What is the difference between a class and an object?

The main difference between a class and an object is that a class is a template or blueprint used to create objects, while an object is an instance of a class. A class is a type of data structure that contains both variables and methods. Variables are used to store data, while methods are used to perform operations on the data. An object is an instance of a class, and it is used to store and manipulate data.

13. What is the purpose of a loop?

The purpose of a loop is to execute a set of statements multiple times. Loops are used to iterate through data or to perform a set of operations repeatedly. There are several types of loops, such as for loops, while loops, and do-while loops. Each type of loop has its own set of features, but the general idea is to execute a set of instructions multiple times.

14. What is the difference between an array and a linked list?

The main difference between an array and a linked list is the way data is stored and accessed. An array is a collection of data items that are stored in a contiguous block of memory. This means that the items in the array can be accessed directly by their indices. A linked list is a collection of data items that are connected together by links. This means that the items in the list need to be traversed in order to access a particular item.

15. What is the difference between procedural and object-oriented programming?

The main difference between procedural and object-oriented programming is the way that data is organized and accessed. In procedural programming, data is organized in a linear fashion and is accessed through functions. In object-oriented programming, data is organized into objects, which are then manipulated through methods. Object-oriented programming is more organized and easier to maintain, as well as being more flexible than procedural programming.

16. What is the difference between a thread and a process?

A thread and a process are both ways of executing code in a computer or server. The main difference is that a thread is a subset of the process. A process contains at least one thread, the main thread, which is the execution thread. A process is an instance of a computer program that is being executed. It can be seen as a container of multiple threads. Threads are the smallest unit of processing that can be scheduled by an operating system. They are also known as lightweight processes, as they can share the same memory and resources of the process that created them. Threads can exist independently within a process, and multiple threads can be used to execute multiple tasks within the same program.

17. What is an interrupt?

An interrupt is a signal to the processor that an event has occurred. It is used to temporarily halt execution of the current process or thread, in order to allow the processor to perform a higher priority task. Interrupts can be generated by either the hardware or the software, and can be used to notify the processor of a variety of events, such as a timer expiring, or an I/O request being complete. When an interrupt is received, the processor suspends the current task, saves its state, and jumps to a special routine called an interrupt service routine (ISR). The ISR is responsible for servicing the interrupt, and restoring the processor to its previous state before returning control to the interrupted task.

18. What is a deadlock?

A deadlock is a situation in which two or more processes are blocked, waiting for each other to finish, thus preventing further progress. Deadlocks can occur when multiple processes access the same resource, and each process holds a resource which the other processes are waiting for. In order for a deadlock to be resolved, one of the processes must give up its resource, allowing the others to proceed.

19. What is a semaphore?

A semaphore is a value that is used to control access to shared resources in a concurrent system. It is used as a synchronization primitive, enabling processes to lock a resource, allowing one process to use the resource at a time, while preventing other processes from accessing the same resource. Semaphores can be used to prevent race conditions, and can be used to signal between processes.

20. What is an operating system?

An operating system (OS) is a set of software programs that manage the hardware and software resources of a computer system. It is responsible for managing the hardware and software resources, as well as providing an interface for the user to interact with the computer. The OS also provides a platform for executing applications and services. Common examples of operating systems include Microsoft Windows, Apple macOS, and Linux.

21. What is a relational database?

A relational database is a type of database management system that stores data in tables, which are related to each other through relationships. It is designed around the concept of relational algebra, which uses functions and relations to manipulate and query the data. Relational databases are highly scalable, and are well suited for data-driven applications. Popular relational databases include Oracle, MySQL, and Microsoft SQL Server.

22. What is virtual memory?

Virtual memory is a feature of an operating system that allows programs to use more memory than is available on the system. It works by using the hard disk as additional memory, by storing parts of a program that are not being used at any given time. When the program needs the data again, it is loaded back into physical memory from the virtual memory on the hard disk. This allows programs to run faster, as the processor does not have to wait for the necessary data to be loaded back into physical memory.

23. What is a linked list?

A linked list is a data structure in which each node has a reference to the next node in the list. It is used for storing sequential data, such as lists or collections of objects. Each node contains a data element, and a pointer to the next node in the list. Linked lists can be used to implement stacks, queues, and other data structures. They are also used in graph algorithms, such as depth-first search, and graph traversal algorithms.

24. What is a hash table?

A hash table is a data structure that stores data in an array-like structure, using a hash function to map the data to a specific index in the array. It is used for storing and retrieving data quickly, as the data can be accessed in constant time, regardless of the size of the data set. Hash tables are commonly used in databases and caching systems.

25. What is dynamic programming?

Dynamic programming is a technique used for solving problems with overlapping subproblems. It works by storing the results of subproblems, so that they can be reused, instead of recalculating them each time. Dynamic programming is used to solve a variety of problems, such as shortest path problems, knapsack problems, and scheduling problems. It is also used in data compression, cryptography, and data mining.

Tips on Preparing for a UST Global Technical Interview

  1. Research the company: get familiar with the company’s mission, products, and services.
  2. Review the job description: make sure you understand the role and what’s expected from you.
  3. Prepare answers to common questions: spend time going over potential interview questions you may be asked.
  4. Dress for success: choose professional attire that is suitable for the job interview.
  5. Bring extra copies of your resume: it’s always a good idea to have extra copies of your resume for the interviewers.
  6. Get some rest: make sure to get enough sleep the night before your UST Global technical interview.
  7. Practice: practice makes perfect. Take time to practice answering interview questions with a friend or family member.
  8. Have questions ready: have a few questions ready to ask the interviewer about the job and the company.
  9. Be confident: let your experience and qualifications shine.
  10. Be professional: remember to be polite and professional throughout the interview.
  11. Listen carefully: listen closely to the interviewer’s questions and answer them accordingly.
  12. Take notes: if it’s allowed, take notes to help you recall important details during the interview.
  13. Show enthusiasm: show your enthusiasm for the company, the job, and the opportunity.
  14. Follow up: follow up with a thank- you note after the interview.
  15. Keep your answers concise: focus on staying on topic and being clear and concise with your answers.


Overall, UST Global Technical Interview Questions and Answers are designed to ensure that the candidates possess the necessary technical skills to meet the company’s needs. By understanding the types of questions the interviewer will ask and being prepared to answer them, you can better demonstrate why you are the perfect fit. With careful preparation and practice, you can be confident and successful in your technical interview.