.Net Developer

Valiant Technologies LLC; Boston (MA); On-site; USD 100,000 - 140,000; Full time

Job summary

Valiant Technologies LLC is seeking a skilled .NET developer to design, build, and maintain scalable web applications. You will work with C#, ASP.NET Core, REST APIs, and cloud services to deliver enterprise solutions.

You will implement business logic, integrate with frontend apps (Angular/React), and optimize database access using EF Core and SQL Server. Join a collaborative Agile team and contribute to DevOps practices.

Qualifications

• Experience designing and developing scalable web applications using C# and .NET technologies.
• Hands-on experience with RESTful services and backend integration.
• Proficiency with SQL Server, stored procedures, and ORM (EF/EF Core).
• Familiarity with modern frontend frameworks and integrating with backend APIs.
• Knowledge of authentication/authorization mechanisms (JWT, OAuth2).
• Experience with Azure cloud services and DevOps tooling.

Responsibilities

• Design, develop, and maintain scalable web applications using C# and .NET Stack.
• Build RESTful Web APIs to support enterprise integrations.
• Implement business logic, OOP patterns, and reusable components.
• Develop database objects and optimize SQL queries for performance.
• Use EF/EF Core for data access and ORM operations.
• Integrate frontend apps with backend APIs (Angular/React).
• Ensure security with Identity, JWT, OAuth2, and RBAC.
• Develop microservices for scalability and resilience.
• Collaborate in Agile/Scrum with QA and analysts.
• Write tests with xUnit, NUnit, and Moq; perform code reviews.

Skills

C#

.NET

ASP.NET Core

REST APIs

SQL Server

Entity Framework

Angular

React

Azure

Git

CI/CD

Authentication

Tools

Azure App Services

Azure Functions

Azure SQL Database

Job description

Roles and Responsibilities

Designed, developed, and maintained scalable web applications using C#, .NET Framework, .NET Core, and ASP.NET Core.

Developed RESTful Web APIs and backend services using ASP.NET Core Web API to support enterprise application integration.

Implemented business logic and application functionality using C#, Object-Oriented Programming (OOP), and design patterns.

Developed database objects, stored procedures, views, functions, and complex SQL queries using Microsoft SQL Server.

Used Entity Framework and Entity Framework Core for database connectivity, data access, and ORM operations.

Implemented LINQ queries for efficient data retrieval, filtering, and manipulation.

Designed and developed reusable components, services, and middleware to improve application maintainability.

Integrated third-party applications and external systems using REST APIs, JSON, and SOAP services.

Implemented authentication and authorization using ASP.NET Identity, JWT, OAuth 2.0, and role-based access control.

Developed microservices-based applications to improve scalability, flexibility, and application performance.

Integrated frontend applications built with Angular or React with backend .NET APIs.

Optimized application performance by improving SQL queries, API response times, and backend processing.

Implemented exception handling, logging, debugging, and application monitoring to ensure system reliability.

Developed unit and integration tests using xUnit, NUnit, and Moq.

Deployed and maintained applications using Microsoft Azure services such as Azure App Services, Azure Functions, and Azure SQL Database.

Used Git, GitHub, and Azure DevOps for source control, CI/CD pipelines, and application deployments.

Participated in code reviews, technical discussions, defect resolution, and production support.

Collaborated with business analysts, QA engineers, and development teams in an Agile/Scrum environment.

Participated in all phases of the Software Development Life Cycle (SDLC), including requirement analysis, design, development, testing, deployment, and maintenance.

We are an equal opportunity employer. All aspects of employment including the decision to hire, promote, discipline, or discharge, will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, national origin, citizenship/ immigration status, veteran status, or any other status protected under federal, state, or local law.