Sr. Dot Net Developer

RELQ TECHNOLOGIES LLC; Toronto; Remote; CAD 120,000 - 150,000; Full time

Job summary

RELQ TECHNOLOGIES LLC is seeking a hands-on Senior .NET Engineer to design, build, and deliver scalable SaaS applications. You will own backend services, RESTful APIs, and database design using SQL Server, EF, and Web API, with a focus on clean code and testing.

This role requires strong C#/.NET Core experience, Angular frontend familiarity, and daily use of AI tools like GitHub Copilot or Claude. You will collaborate across teams in a remote setting with a growth-minded environment.

Qualifications

• 5+ years of enterprise or SaaS software development experience.
• Strong hands-on experience with C#, .NET Core and Web API.
• Experience with EF Core/EF6 and SQL Server performance tuning.
• Frontend experience with Angular or similar frameworks.
• Familiarity with CI/CD, Git and Agile environments.
• Active daily use of AI development tools (GitHub Copilot, Claude).

Responsibilities

• Break down large problems and design clean solutions.
• Build and maintain RESTful APIs and backend services.
• Apply DDD and CQRS to build modular, scalable systems.
• Design databases, write queries, and tune performance in SQL Server.
• Write clean, testable code with documentation and tests.
• Lead testing initiatives in a shift-left mindset with no dedicated QA.
• Collaborate with product managers to deliver customer-focused features.

Skills

5+ years experience

English communication

Debugging & troubleshooting

Tools

C#

NET Core

Web API

EF Core

EF6

SQL Server

Angular

Git

CI/CD

GitHub Copilot

Claude

Job description

Job Title : Senior .NET Developer

Location : Canada ( Remote)

Contract Duration : 6-12+ Month with possible extension

We're looking for a hands-on Senior .NET Engineer to help design, build, and deliver high-quality, scalable enterprise SaaS applications. This role is ideal for someone who enjoys solving complex problems, writing clean code, and taking full ownership of their work-including testing and quality.

What You'll Be Doing

• Break down large or complex problems into smaller parts, design clean solutions, and implement the core framework.
• Build and maintain RESTful APIs and backend services using C#, .NET Core, Entity Framework, and Web API.
• Apply software architecture patterns like Domain-Driven Design (DDD) and CQRS to build modular and scalable systems.
• Work directly with SQL Server - designing databases, writing stored procedures, optimizing queries, and tuning performance.
• Use Entity Framework (EF Core or EF6) for ORM and data access.
• Write clean, testable, and maintainable code with proper documentation.
• Take full ownership of testing your own code-unit, integration, and performance testing-as part of a Shift Left / No QA team setup.
• Collaborate with product managers and other teams to understand requirements and deliver customer-focused features.
• Use AI development tools (required)-including GitHub Copilot, Claude, or similar-to assist with code generation, refactoring, documentation, and development speed.

What You Should Bring

• 5+ years of experience in enterprise or SaaS software development.
• Strong hands-on experience with:
• C#, .NET Core, Web API
• Angular or other frontend frameworks.
• Entity Framework (EF Core or EF6)
• SQL Server writing queries, stored procedures, indexing, and performance tuning
• Solid understanding of object-oriented programming, design patterns, and enterprise architecture.
• Experience with DDD, CQRS, and clean layering of business logic and data access.
• Familiarity with multi-threading, asynchronous programming, and system performance tuning.
• Comfortable with Git and working in a modern development environment (CI/CD, Agile).
• Strong debugging and troubleshooting skills.
• Excellent communication skills (written and verbal) in English.
• Experience working across multiple teams or squads.
• Required: Active daily use of AI development tools like GitHub Copilot, Claude, or similar in your workflow.