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Senior Software Developer – .NET Core & React.js

Job in New York, New York County, New York, 10261, USA
Listing for: MS Shift, Inc.
Full Time position
Listed on 2026-08-22
Job specializations:
  • Software Development
    Full Stack Developer, Backend Developer, Senior Developer, Software Engineer
Salary/Wage Range or Industry Benchmark: 120000 - 180000 USD Yearly USD 120000.00 180000.00 YEAR
Job Description & How to Apply Below
Location: New York

Senior Software Developer – .NET Core & React.js

We are looking for a Senior Software Developer with expertise in ASP.NET Core and React.js to join our dynamic team. The ideal candidate will have strong backend and frontend development skills, experience designing scalable applications, and a deep understanding of modern web technologies. You will play a key role in building and maintaining our web applications, ensuring high performance, scalability, and security.

Responsibilities
  • Design, develop, and maintain RESTful APIs using ASP.NET Core.
  • Implement authentication and authorization mechanisms using JWT, OAuth, or Identity Server.
  • Optimize database performance using Entity Framework Core (EF Core) with SQL Server/PostgreSQL.
  • Write efficient and secure backend logic, ensuring scalability and maintainability.
  • Integrate third-party services and APIs.
  • Frontend Development (React.js)
  • Develop and maintain user-friendly React.js applications.
  • Implement state management using Redux, Zustand, or React Query.
  • Ensure responsive UI/UX with CSS-in-JS, Tailwind, or Material UI.
  • General
  • Collaborate with product managers, designers, and other developers to define requirements and deliver high-quality software.
  • Perform code reviews and provide mentorship to junior developers.
  • Ensure best practices in coding, security, and Dev Ops.
  • Write unit and integration tests using xUnit, Jest, or Cypress.
  • Work with CI/CD pipelines (Git Hub Actions, Azure Dev Ops, or Jenkins) for automated deployments.
Qualifications
  • 10+ years of experience in full-stack web development.
  • Strong knowledge of C# and ASP.NET Core.
  • Experience with SQL Server, PostgreSQL, or No

    SQL databases.
  • Familiarity with microservices architecture and Docker/Kubernetes.
  • Hands-on experience with Azure.
  • Strong understanding of SOLID principles and clean architecture.
  • Experience with unit testing and test-driven development (TDD).
  • Proficiency with Git and Agile development methodologies.
  • Preferred: knowledge of Domain-Driven Design (DDD).

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

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Position Requirements
10+ Years work experience
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