Senior .Net Developer

Remote from: Poland
Annual salary: Undisclosed
Salary information is not provided for this position. Check our Salary Directory to estimate the average compensation for similar roles.
Department: Programming
Employment type: Full Time,
Job posted: 2 Jun 2026
Apply before: 2 Jul 2026
Experience level: Senior
Views / Applies: 19 / 2

We share a common goal of making a positive impact through partnership & technology, helping clients move beyond the conventional and unlock new opportunities to achieve their most ambitious goals.

Computer Software
2011

AI Summary

Trinetix is seeking a Senior .NET Developer with 5+ years of experience to design and maintain secure, scalable APIs using .NET C#. The role involves working with Entity Framework Core and SQL, supporting cloud migration to Azure, and exploring machine learning integration. The ideal candidate will collaborate with cross-functional teams to deliver high-quality solutions and contribute to CI/CD practices. This position offers an opportunity to work on impactful projects in a global, people-first company.

Role DNA

Job Complexity

Easy Hard

Pace & Pressure

Relaxed Fast-paced

Autonomy Level

Guided Full Ownership

Communication Load

Independent Highly Collaborative

AI Insight The role requires a senior-level skill set with deep expertise in .NET, SQL, and cloud technologies, plus emerging exposure to machine learning, making it challenging but not the hardest.

Salary Analysis

AI Insight The job posting does not specify a salary range. Based on US market data, a Senior .NET Developer typically earns between $90,000 and $170,000 annually, with a median around $130,000. The offered compensation is likely competitive given the seniority and technical requirements.

Key Skills

.NET C# Entity Framework Core SQL RESTful APIs Azure Git CI/CD Machine Learning Microservices

Cover Letter Sample

Dear Hiring Manager,

I am writing to express my strong interest in the Senior .NET Developer position at Trinetix. With over 5 years of professional experience in .NET C# development, I have a proven track record of building secure, scalable RESTful APIs and optimizing database performance using Entity Framework Core and SQL. My background includes working with Azure services such as App Services and Azure Functions, and I am eager to contribute to your cloud migration initiatives.

I am particularly drawn to the opportunity to integrate machine learning models into applications, as I have a foundational understanding of ML model deployment via APIs. My experience with CI/CD practices and unit testing frameworks like xUnit aligns well with your commitment to clean, maintainable code. I thrive in collaborative environments and am adept at working independently to solve complex problems.

I am excited about the chance to join a global team that values innovation and people-first culture. I look forward to the possibility of discussing how my skills can contribute to Trinetix's success. Thank you for your consideration.

Sincerely,
[Your Name]

Possible Interview Questions

Can you describe your experience with designing and implementing RESTful APIs using .NET C#? Provide an example of a complex API you built.

I have extensive experience building RESTful APIs with ASP.NET Core. For example, I designed a scalable API for an e-commerce platform that handled thousands of requests per second. I used attribute routing, middleware for authentication and logging, and implemented versioning to ensure backward compatibility.

How do you optimize SQL queries and ensure efficient data access with Entity Framework Core?

I analyze query execution plans, use indexing strategies, and avoid N+1 query problems by eager loading related data. With EF Core, I leverage compiled queries and raw SQL for complex operations. I also implement pagination and caching to reduce database load.

What experience do you have with Azure services, and how would you support a cloud migration from on-premises infrastructure?

I have worked with Azure App Services, Azure SQL Database, and Azure Functions. For migration, I assess the current architecture, identify dependencies, and refactor applications to be cloud-native. I use Azure Migrate for assessment and implement gradual migration with minimal downtime.

Can you explain how you would integrate a machine learning model into an existing .NET application?

I would expose the ML model as a RESTful API using Azure ML or a custom service, then consume it from the .NET application via HTTP calls. I ensure proper error handling and authentication. For real-time predictions, I might use Azure Functions for serverless integration.

Describe your approach to writing unit tests and ensuring code quality in a CI/CD pipeline.

I use xUnit for unit testing and apply TDD principles. I write tests for business logic and edge cases. In CI/CD with GitHub Actions, I automate test execution on each push, enforce code coverage thresholds, and integrate static analysis tools to maintain code quality.

We’re looking for a skilled .NET C# Developer.

If you’re passionate about building secure, scalable APIs, working with established systems while helping guide our shift toward the cloud, and are excited by the opportunity to explore machine learning integration—this is your chance to be part of something that truly matters.

Requirements

5+ years of professional experience in .NET C# development

Proficiency with Entity Framework (preferably EF Core)

Strong command of SQL, including complex query writing and optimization

Experience building RESTful APIs with ASP.NET or ASP.NET Core

Familiarity with version control systems, especially Git

Solid problem-solving and debugging skills

Ability to communicate effectively and work independently or as part of a team

Nice-to-haves

Exposure to Azure services such as App Services, Azure SQL, and Azure Functions

Basic understanding of machine learning model integration via APIs or Azure ML

Familiarity with OData, microservices, and distributed systems concepts

Experience writing unit tests (e.g., xUnit, NUnit, MSTest)

Knowledge of CI/CD practices, especially using GitHub Actions

Interest or experience in DevOps practices and automation

Core Responsibilities

API Development: Design, build, and maintain RESTful APIs using .NET C#, focusing on performance, reliability, and security.

Entity Framework & SQL: Develop efficient data models using Entity Framework Core, and write optimized SQL queries for relational databases like SQL Server.

Cloud Transition Support: Contribute to new development efforts that utilize Azure services (e.g., Azure Functions, App Services, Azure SQL) as we begin migrating from on-prem infrastructure.

Machine Learning Integration: Collaborate with stakeholders to integrate machine learning models via RESTful APIs or Azure ML services.

Clean, Maintainable Code: Follow best practices to write testable, maintainable, and well-documented code.

Cross-Team Collaboration: Work closely with fellow developers and business partners to deliver secure, scalable solutions.

CI/CD Practices: Support continuous integration and delivery efforts using tools like GitHub Actions.

Problem Solving: Investigate and resolve performance issues, bugs, and bottlenecks in existing systems.

About Us
Established in 2011, Trinetix is a dynamic tech service provider supporting enterprise clients around the world.

Headquartered in Nashville, Tennessee, we have a global team of over 1,000 professionals and delivery centers across Europe, the United States, and Argentina. We partner with leading global brands, delivering innovative digital solutions across Fintech, Professional Services, Logistics, Healthcare, and Agriculture.

Our operations are driven by a strong business vision, a people-first culture, and a commitment to responsible growth. We actively give back to the community through various CSR activities and adhere to international principles for sustainable development and business ethics.

To learn more about how we collect, process, and store your personal data, please review our Privacy Notice: https://www.trinetix.com/corporate-policies/privacy-notice

Requirements

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