Senior Software Engineer – .NET, C#

Nexaminds

. Design, develop, and maintain RESTful APIs and backend services using C# and .NET Core .

Posted 11/4/2026full-timeRemote • MexicoSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and developing RESTful APIs using C# and .NET Core, with a strong focus on API-First design principles and backend architecture. Proficient in SQL Server and Entity Framework Core, ensuring high-quality, scalable, and maintainable software solutions.

Highest-signal resume keywords

C# DevelopmentRESTful API DesignSQL Server OptimizationEntity Framework CoreCI/CD Processes

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

C#RESTful APIsSQL ServerEntity Framework CoreAsynchronous ProgrammingObject-Oriented ProgrammingDesign PatternsUnit TestingGitAgile Methodologies

Soft Skills

Analytical SkillsTroubleshootingProblem-SolvingCommunicationCollaboration

Tools & Technologies

Microsoft AzureAWSDockerKubernetesSwaggerOpenAPI

Industry Keywords

API GovernanceMicroservices ArchitectureContinuous ImprovementVersion ControlPerformance Tuning

Tech Stack

Tools & technologies

AngularAWSAzureCloudDistributed SystemsDockerEntity FrameworkKubernetesMicroservicesReactSQLVue.js.NET

About the role

Key responsibilities & impact

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

Requirements

What you’ll need

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
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

Benefits

Comp & perks

Stock options
Remote work options
Flexible working hours
Benefits above the law
Mentorship and opportunities to learn and level up
Collaboration with experienced IT professionals