Appinventiv interview experience Real time questions & tips from candidates to crack your interview
Dotnet Fullstack Developer
Appinventiv
3 rounds | 16 Coding
problems
Selected Interview preparation journey
Journey
My journey into software development began with curiosity and very basic programming knowledge. Initially, even simple concepts in C# and object-oriented programming felt challenging. I focused on building strong fundamentals and practiced consistently. Gradually, I moved into ASP.NET Core, learning how APIs, databases, and authentication work in real-world applications.
The real growth happened when I shifted from just coding to understanding core concepts like dependency injection, asynchronous programming, and database optimization. Learning React further strengthened my full-stack perspective.
There were challenges and moments of self-doubt, but staying consistent and continuously improving helped me grow. Cracking this interview reflects disciplined effort, practical experience, and a commitment to learning every single day.
Application story
I came across this opportunity while actively exploring roles that aligned with my experience in .NET Core and full-stack development. After reviewing the job description, I felt that my skills and project experience matched the requirements well, so I applied through the official career portal.
Shortly after applying, I received communication from the recruitment team regarding the next steps. The process was well-structured and transparent, with clear instructions at each stage. The interviews were scheduled in advance, and the coordination was smooth throughout. Overall, the journey from application to interview was professional and organized, which made the experience positive and encouraging.
Preparation
Duration: 2 months
Topics: C#, .NET Core Web API, Entity Framework Core, SQL Server (query optimization, indexing, joins, CTEs), REST API design, JWT authentication, React (hooks, state management, API integration), HTML, CSS, JavaScript, Clean Architecture, SOLID principles, Git, basic deployment concepts
Tip 1: Focus on strengthening your fundamentals first (OOP, API lifecycle, SQL basics) before jumping into advanced topics. Strong basics make complex concepts easier to understand.
Tip 2: Build at least 2–3 real-world projects and try to understand every layer, from database design to frontend integration, instead of just making it work.
Tip 3: Practice debugging and performance optimization regularly. Learning how to fix real issues and improve efficiency builds deeper confidence than just writing code.
Application process
Where: Naukri
Eligibility: B.Tech degree with 3+ years of experience in the domain. (Salary Package: 12 LPA)
Tip 1: Keep your resume concise and project-focused. Clearly mention the technologies used and your exact contributions instead of listing generic responsibilities.
Tip 2: Be honest about your skills and experience. Only include technologies that you can confidently explain with practical examples during the interview.
Tip 3: Highlight measurable impact wherever possible (e.g., improved API performance, reduced query time, optimized load time) to showcase real value.
Interview rounds
01
Round
Easy
Face to Face
Duration60 minutes
Interview date18 Nov 2025
Coding problem7
1. Framework Differences
What is the difference between .NET Framework and .NET Core?
2. .NET Filters
What are filters in .NET Core (Action, Authorization, and Exception)?
3. JWT Authentication
How does JWT authentication work?
4. Caching Concepts
What is caching? Have you used in-memory caching or distributed caching?
5. DBMS
What is normalization? Explain the different normal forms. (Learn)
6. Query Optimization
How do you optimize a slow query?
7. Component Control
In React, what is the difference between controlled and uncontrolled components?
02
Round
Hard
Face to Face
Duration60 minutes
Interview date20 Nov 2025
Coding problem8
1. SQL Queries
Write an SQL query:
- Find the second-highest salary. (Practice)
- Remove duplicate records.
2. HTTP Lifecycle
Explain the complete lifecycle of an HTTP request in .NET Core.
3. API Debugging
If your API is slow in production, how would you debug it?
Discussion points include:
- Logging
- Application Insights
- SQL execution plan
- Indexes
- Async blocking calls
- Thread pool starvation
- Caching strategy
4. DI Concepts
- How does Dependency Injection work internally?
- Service provider
- Lifetime management
- What happens if a scoped service is injected into a singleton?
- Circular dependency handling
5. Async Internals
How does async/await work internally? (Learn)
Be prepared to discuss:
- What is a Task?
- What is SynchronizationContext?
- What happens if you forget await?
- Can async improve CPU-bound operations?
6. API Design
How would you design a large, scalable Web API project?
Expected topics:
- Clean Architecture
- Layer separation
- DTOs
- AutoMapper
- Repository + Unit of Work
- Logging
- Validation (FluentValidation)
- Versioning
- Swagger
- Health checks
7. API Caching
How would you implement caching in a high-traffic API?
- In-memory cache
- Distributed cache (Redis)
- Cache invalidation strategy
- Sliding vs. absolute expiration
8. SQL Queries
Write an SQL query to:
- Find the third-highest salary
- Remove duplicate rows
- Implement pagination without using OFFSET
03
Round
Medium
Online Coding Interview
Duration40 minutes
Interview date25 Nov 2025
Coding problem1
1. HR Questions
- Why are you looking for a job change?
- Tell me about a conflict with your team or manager. How did you handle it?
- Have you ever made a mistake in production?
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Skill covered: Programming
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