Application Architecture Interview Questions and Answers in 2025 (100+ Q&A)

Application Architecture Software Testing Engineer/ Test Automation Engineer

Ques:- In 3 tier Architecture What are the factors should be considered for testing?

Asked In :- Rits Software, Logisoft, SysMind, Sky Bet Gaming, kaseya, starlims corporation, macedon technologies, mediakind global, techware solution,

Right Answer:
In a 3-tier architecture, the factors to consider for testing include:

1. **Layer Interaction**: Ensure proper communication between the presentation, business logic, and data layers.
2. **Data Integrity**: Validate data flow and consistency across all layers.
3. **Performance**: Test response times and load handling for each tier.
4. **Security**: Check for vulnerabilities at each layer, including data access and user authentication.
5. **Scalability**: Assess how well the application scales with increased load.
6. **Error Handling**: Verify that errors are properly managed and logged across layers.
7. **Usability**: Test the user interface for functionality and user experience.
8. **Integration**: Ensure that external systems and services interact correctly with the application.

Application Architecture Software Testing Architect

Ques:- Please explain 3-tier architecture?

Asked In :- Sarjen Systems, Christie Digital, ACPL Systems, Provakil Technologies, Provar, Dxc Technology India, ils, tdm group, softwire, aspect ratio,

Right Answer:
3-tier architecture is a software design pattern that separates an application into three layers:

1. **Presentation Layer**: This is the user interface where users interact with the application.
2. **Application Layer (Business Logic Layer)**: This layer processes user inputs, applies business rules, and communicates between the presentation and data layers.
3. **Data Layer**: This layer manages data storage and retrieval, typically involving a database.

Each layer is independent, allowing for easier maintenance and scalability.

Application Architecture Software Developer/ Programmer

Ques:- What is DTH ?

Asked In :- Rits Software, Sagacity Software, edgeverve, wso2, omc, esspl, sca technologies, rev solutions, relativity, knowmore,

Right Answer:
DTH stands for Direct-to-Home, which is a satellite television broadcasting service that delivers television programming directly to subscribers' homes via satellite signals.

Application Architecture Software Developer/ Programmer

Ques:- Tell us about MODEM

Asked In :- 8KMiles Software Services, Provakil Technologies, f5 networks, kaust, benefitfocus, razorpay, moogsoft,

Right Answer:
A modem (modulator-demodulator) is a device that converts digital data from a computer into an analog signal for transmission over telephone lines and vice versa, allowing for internet connectivity.

Application Architecture

Ques:- Explain RMI Architechture ?

Asked In :- NSOFT SOLUTIONS, APPSIERRA SOLUTIONS, Caliber Technologies, WebMobril Technologies, iress, esspl, global ids, epicenter, techware solution, core ecs,

Right Answer:
RMI (Remote Method Invocation) architecture allows Java programs to invoke methods on an object located in another Java Virtual Machine (JVM). It consists of the following components:

1. **Client**: The application that invokes methods on a remote object.
2. **Server**: The application that provides the remote object and its methods.
3. **Remote Object**: An object that resides on the server and can be accessed remotely.
4. **Stub**: A client-side proxy that represents the remote object and forwards method calls to the server.
5. **Skeleton**: A server-side component that receives calls from the stub and invokes the actual remote object methods.
6. **RMI Registry**: A naming service that allows clients to look up remote objects by name.

The client interacts with the stub, which communicates with the skeleton on the server, allowing method calls to be executed remotely.

Application Architecture

Ques:- The interviewers couldn’t understand that a website could use asychronous messaging in its middleware even though UI may seem synchronous.

Asked In :- NJ Technologies, Sea Sense Softwares, opsgenie, blubirch,

Right Answer:
A website can use asynchronous messaging in its middleware by processing requests in the background while the user interface remains responsive. This means that the UI can display loading indicators or allow user interactions while the server handles tasks like database queries or API calls without making the user wait for the response.

Application Architecture Team Lead/ Tech Lead

Ques:- Describe architecture of your current project.

Asked In :- Sarjen Systems, Digital Core Technologies, razorpay, object edge, codec ireland, symphony summit, endeca, adl,

Right Answer:
The architecture of my current project is based on a microservices approach. Each service is independently deployable and communicates through REST APIs. We use a front-end framework like React for the user interface, while the backend is built with Node.js and Express. Data is managed using a PostgreSQL database, and we utilize Docker for containerization and Kubernetes for orchestration. Additionally, we implement CI/CD pipelines for automated testing and deployment.

Application Architecture Software Developer/ Programmer

Ques:- As mentioned by you what / how ATM devices you used with kiosk

Asked In :- Newt Global India, qualcomm, gallagher, spryker systems gmbh, bigpanda, opg, aurigo software technologies,

Right Answer:
I have used various ATM devices integrated with kiosks, including card readers for user authentication, cash dispensers for transactions, and receipt printers for providing transaction records.

Application Architecture Software Developer/ Programmer

Ques:- How does the Internet work?

Asked In :- iNube Software Solutions, New Relic, Dassault Systemes, Sycamore Software, ACPL Systems, Cue Health Inc, qnx software systems, a2 hosting,

Right Answer:
The Internet works by connecting millions of computers and devices through a network of servers, routers, and cables. Data is transmitted in small packets using protocols like TCP/IP, allowing devices to communicate and share information across the globe.

Application Architecture Software Developer/ Programmer

Ques:- What kinds of diagrams have you used in designing parts of an architecture, or a technical design?

Asked In :- IT Cube Solutions, WebMobril Technologies, kaseya, ste, tdm group, relativity, tsi, blubirch,

Right Answer:
I have used the following diagrams in designing parts of an architecture or technical design:

1. **Class Diagrams** - to represent the structure of classes and their relationships.
2. **Sequence Diagrams** - to illustrate how objects interact in a particular scenario over time.
3. **Component Diagrams** - to show the organization and dependencies among a set of components.
4. **Deployment Diagrams** - to depict the physical deployment of artifacts on nodes.
5. **Flowcharts** - to represent the flow of processes or algorithms.
6. **Use Case Diagrams** - to capture functional requirements and interactions between users and the system.
7. **Entity-Relationship Diagrams (ERD)** - to model the data and relationships in a database.
8. **Architecture Diagrams** - to provide a high-level view of the system architecture and its components.

Application Architecture

Ques:- What kind of diagrams have you used in designing parts of an architecture or a technical design?

Asked In :- Recodem, Christie Digital, Hiya, textron, omc, ibp, perfecto mobile, moogsoft, symphony summit, core ecs,

Right Answer:
I have used the following diagrams in designing parts of an architecture or technical design:

1. **Component Diagram** - to show the components and their relationships.
2. **Class Diagram** - to represent the structure of classes and their interactions.
3. **Sequence Diagram** - to illustrate how objects interact in a particular scenario over time.
4. **Deployment Diagram** - to depict the physical deployment of artifacts on nodes.
5. **Flowchart** - to visualize the flow of processes or data.
6. **Use Case Diagram** - to capture functional requirements and user interactions.
7. **Architecture Diagram** - to provide an overview of the system architecture and its components.

Application Architecture refers to the blueprint or framework that outlines how software applications are structured and how their components interact with each other and with external systems. It involves defining the layers, modules, interfaces, and data flow to ensure that an application meets business requirements, performs efficiently, and is easy to maintain and scale.

A well-designed application architecture considers aspects such as usability, security, performance, and reliability. Common architectural patterns include monolithic, microservices, client-server, and event-driven architectures. Architects decide on technology stacks (like databases, APIs, frontend/backend frameworks), integration methods, and deployment strategies.

Professionals working in this domain analyze business needs and translate them into technical specifications. They also focus on modularity, reusability, and ensuring that different components can evolve independently without breaking the system. Understanding cloud architectures, containerization (Docker, Kubernetes), and DevOps practices is increasingly important.

Good application architecture reduces development time, improves collaboration between teams, and supports future growth. It helps avoid technical debt and ensures that applications remain robust as user demands increase.

Whether you’re a software developer, system architect, or project manager, knowledge of application architecture principles is essential for delivering quality software solutions aligned with organizational goals.

Questions in: Application Architecture

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