Senior Software Engineer (.NET / C# / RESTful APIs)

Nexaminds; United States; À distance; USD 120 000 - 180 000; Plein temps

Avantages offerts par ce poste

Stock options

Remote work options

Flexible hours

Benefits above the law

Mentorship and learning

Résumé du poste

Nexaminds in the United States is seeking a Senior Software Engineer to design, develop, and maintain scalable backend services using C#, .NET Core, SQL Server, and EF Core. You will build RESTful APIs following API-First principles, collaborate across teams, and contribute to architectural decisions, CI/CD, and quality improvements, shaping complex distributed systems.

We offer stock options, remote work options, flexible hours, and strong opportunities for mentorship and learning in a dynamic

Qualifications

• 5–8 years of professional software development experience with C# and .NET Core.
• Hands-on experience designing, developing, and maintaining RESTful APIs using API-First design principles.
• Strong SQL Server experience including schema design, stored procedures, query optimization and performance tuning.
• Hands-on experience with Entity Framework Core.
• Solid understanding of OOP, design patterns, and SOLID principles.
• Experience with asynchronous programming, DI, and unit testing frameworks.
• Experience with Git, CI/CD pipelines, and Agile development methodologies.
• Strong understanding of backend architecture, service integration, and scalable design.
• Analytical, troubleshooting and problem-solving skills.
• Excellent communication and collaboration skills.

Responsabilités

• Design, develop, and maintain RESTful APIs and backend services using C# and .NET Core.
• Apply API-First design principles to build scalable, maintainable, and reusable services.
• Define and maintain API specifications to ensure consistency and integration across applications.
• Develop and optimize data access layers using EF Core and SQL Server.
• Collaborate with Product, Front-End, QA, and Engineering teams to translate requirements into solutions.
• Apply software engineering best practices including clean code, design patterns, automated testing, and version control.
• Contribute to CI/CD processes and continuous improvement of development workflows.
• Troubleshoot and resolve complex performance, scalability, and integration issues.
• Conduct code reviews and provide mentorship to other developers.
• Participate in architecture discussions involving backend services and API governance.
• Ensure applications meet quality, performance, security, and maintainability standards.

Connaissances

C#

.NET Core

RESTful APIs

API-First design

SQL Server

Entity Framework Core

OOP & SOLID

Async programming

Dependency Injection

Unit testing

Git & CI/CD

Agile

Backend architecture

System integration

Problem solving

Communication

Outils

Swagger/OpenAPI

Docker

Kubernetes

Azure/AWS

Description du poste

Unlock Your Future with Nexaminds!

At Nexaminds, we’re on a mission to redefine industries with AI. We’re passionate about the limitless potential of artificial intelligence to transform businesses, streamline processes, and drive growth.

Join us on our visionary journey. We’re leading the way in AI solutions, and we’re committed to innovation, collaboration, and ethical practices. Become a part of our team and shape the future powered by intelligent machines. If you’re driven by ambition, success, fun, and learning, Nexaminds is where you belong.

This position is open exclusively to candidates who are currently residing in Mexico. Before applying, we encourage you to review our open positions and make sure the location requirements match your current location.Candidates who are not currently based in Mexico will not be contacted for this opportunity.

Nexaminds is looking for a Senior Software Engineer to design, develop, and maintain scalable enterprise applications and backend services using C#, .NET Core, SQL Server, and Entity Framework. The ideal candidate has strong hands‑on experience building RESTful APIs following API-First design principles , with a focus on performance, scalability, maintainability, and code quality. This role combines backend development with technical collaboration, contributing to architectural decisions, engineering best practices, and the development of reliable solutions across distributed systems.

Qualifications we are looking for:

• 5–8 years of professional experience in software development using C# and .NET Core.
• Strong hands‑on experience designing, developing, and maintaining RESTful APIs following API-First design principles.
• Strong proficiency in SQL Server , including database schema design, stored procedures, query optimization, and performance tuning.
• Hands‑on experience with Entity Framework / Entity Framework Core (EF Core).
• Solid understanding of object‑oriented programming (OOP), design patterns, and SOLID principles.
• Experience with asynchronous programming, dependency injection, and unit testing frameworks.
• Experience with Git, CI/CD pipelines, and Agile development methodologies.
• Strong understanding of backend architecture, service integration, and scalable application design.
• Strong analytical, troubleshooting, and problem‑solving skills.
• Excellent communication and collaboration skills.

Nice to have:

• Experience with Microsoft Azure or AWS cloud services.
• Familiarity with microservices architecture and containerization technologies such as Docker or Kubernetes.
• Experience with message queues, caching mechanisms, or distributed systems.
• Knowledge of Swagger / OpenAPI , API documentation, and API versioning.
• Basic understanding of front‑end technologies such as React, Angular, or Vue.

Job Duties:

• Design, develop, and maintain RESTful APIs and backend services using C# and .NET Core.
• Apply API-First design principles to build scalable, maintainable, and reusable services.
• Define and maintain API specifications to ensure consistency, discoverability, and integration across applications.
• Develop and optimize data access layers using Entity Framework Core and SQL Server.
• Collaborate with Product, Front‑End, QA, and Engineering teams to translate business requirements into reliable technical solutions.
• Apply software engineering best practices, including clean code, design patterns, automated testing, and version control.
• Contribute to CI/CD processes and continuous improvement of development workflows.
• Troubleshoot and resolve complex application performance, scalability, and integration issues.
• Conduct code reviews and provide technical guidance and mentorship to other developers.
• Participate in architectural discussions involving backend services, API governance, and system integration.
• Ensure applications meet quality, performance, security, and maintainability standards.

What you can expect from us

Here at Nexaminds, we’re not your typical workplace. We’re all about creating a friendly and trusting environment where you can thrive. Why does this matter? Well, trust and openness lead to better quality, innovation, commitment to getting the job done, efficiency, and cost-effectiveness.

• Stock options
• Remote work options
• Flexible working hours
• Benefits above the law
• But it’s not just about the work; it’s about the people too. You’ll be collaborating with some seriously awesome IT pros.
• You’ll have access to mentorship and tons of opportunities to learn and level up.