Backend Engineer - .NET & Azure - REST APIs & Security

Kunwardeep Singh Nagpal

+91-911******* — *************@*****.*** — LinkedIn — GitHub

Profile Summary

Backend Software Engineer with 1+ year of internship experience building secure REST APIs, cloud-native services, and SQL- backed systems on the .NET and Azure stack. Delivered auth systems securing 2000+ users, reduced API latency by 35%, and maintained 80%+ test coverage in a production fintech environment. Skilled in OOP, SOLID principles, CI/CD, and Agile delivery.

Work Experience

Junior Software Engineer InvoiceCloud, Hyderabad Apr 2025 – May 2026

• Designed and developed SSO and MFA authentication systems using SecureAuth, securing 2000+ Biller Logins and eliminating token vulnerabilities across production environments.

• Built 5+ scalable REST APIs following clean architecture (Controller-Service-Repository) with Swagger/OpenAPI documentation, integrating Microsoft In-Memory Cache for biller data to reduce redundant DB calls and improve response times.

• Designed SQL Server schemas and optimized stored procedures, reducing backend API latency by 35% across critical billing endpoints.

• Implemented SQL Server RowVersion-based optimistic concurrency control on the User Management page to prevent conflicting updates during MFA enablement, ensuring data integrity under concurrent biller sessions.

• Managed secure key rotation using Azure Key Vault across Git repositories, enabling zero-downtime deployments across all production releases.

• Developed and maintained unit tests achieving 80%+ code coverage, validating business logic and reducing regression defects during feature releases.

• Performed API validation for REST and SOAP services using SoapUI; contributed to Selenium-based UI automation, reducing manual testing effort by 40% per release cycle.

• Utilized Jira, Confluence, and XRay for sprint tracking, documentation, test management, and defect lifecycle in a 2-week Agile SDLC.

Education

B.E. Computer Science, Chitkara University 2022 – 2026 CGPA: 8.59/10 Skills

Backend: C#, .NET Core/.NET 8, ASP.NET Core Web API, EF Core, LINQ, JWT, Swagger/OpenAPI Database: SQL Server, Stored Procedures, Query Optimization, Indexing, Performance Tuning, RowVersion Concurrency Cloud/DevOps: Azure, Azure Key Vault, Azure DevOps, CI/CD, Git, GitHub, Jira, Confluence Testing & Quality: Unit Testing (80%+ coverage), API Testing, Selenium, Cucumber, SoapUI, XRay, SonarQube CS Fundamentals: DSA (700+ Solved), OOP, SOLID, SDLC, Agile Frontend: React, JavaScript, HTML, CSS, jQuery

Projects

Movie Search Application (.NET Core + Semantic Vector Search using GitHub Models)

• Built a natural language movie recommendation engine over 5000+ movie records, enabling similarity-based retrieval via descriptive queries instead of keyword matching — replacing traditional exact-match search.

• Implemented semantic vector search using OpenAI embeddings and an in-memory vector store; achieved top-5 nearest-neighbor retrieval with sub-second response times across the full dataset. E-Commerce Web Application (.NET Core + React)

• Built a full-stack platform supporting product catalog, cart, and order management using ASP.NET Core Web API, EF Core, LINQ, and JWT-based authentication.

• Developed 10+ secure REST APIs with centralized validation, exception handling, and clean Controller-Service-Repository architecture following SOLID principles.

Achievements

• Solved 700+ DSA problems on LeetCode and GeeksforGeeks, demonstrating strong problem-solving ability across arrays, trees, graphs, and dynamic programming.

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