Position Description:

Senior .NET Developer - Web and Mobile Application Security

Position Description

We are looking for an experienced .NET Developer to contribute to the development, evolution, and security of our critical web and mobile applications.

You will actively participate in the design and optimization of modern application solutions based on the Microsoft .NET ecosystem, while integrating best practices in application security, performance, observability, and software architecture.

You will work in a stimulating technological environment where code quality, system robustness, and continuous improvement are top priorities.

Your future duties and responsibilities

- Design, develop, and maintain web applications and APIs in .NET
- Participate in the evolution and integration of mobile applications (iOS and Android) with backend services
- Design robust, high-performance, and secure application solutions
- Participate in improving application architecture and modernizing existing systems
- Optimize the performance of applications and SQL Server databases
- Integrate and utilize monitoring, logging, and observability tools (Elastic Stack or equivalent)
- Implement secure development best practices
- Participate in code reviews and the improvement of development standards
- Collaborate with architecture, infrastructure, security, and development teams
- Contribute to technical documentation and knowledge sharing

Required qualifications to be successful in this role

- Degree in Computer Science or equivalent
- Minimum of 5 years of experience in software development
- Excellent command of the .NET / C# ecosystem
- Experience in developing modern web applications
- Good understanding of API and microservices architectures
- Experience in Agile environments
- Strong analytical and problem-solving skills
- Autonomy, rigor, and a strong sense of responsibility




- Ability to work effectively in a team
- Fluent in spoken and written French

Assets

- Experience with mobile applications (iOS / Android)
- Knowledge of payroll, HR, or management systems

Essential Technical Specializations

Development

- C#, .NET Framework / .NET Core / .NET 8+
- ASP.NET MVC, Web API, Microservices Architecture

Web and Mobile

- Web Applications
- Integration with iOS and Android applications
- REST API

Data

- SQL Server, Query Optimization, Stored Procedures, Performance Analysis

Security Application Security

- Application security best practices
- API security
- Access management and authentication (OAuth2, JWT – an asset)

Observability and monitoring

- Application logging
- Elastic Stack (Elasticsearch, Kibana, Logstash) or similar tools
- Monitoring and APM tools

Tools

- Visual Studio / Git
- GitHub / Jira / Confluence
- Windows Server / IIS

General skills

- Excellent autonomy
- Technical and functional analysis skills
- Technological curiosity
- Continuous improvement mindset
- Ability to design robust and scalable solutions
- Strong collaborative work skills

CGI is providing a reasonable estimate of the pay range for this role. The determination of this range includes factors such as skill set level, geographic market, experience and training, and licenses and certifications. Compensation decisions depend on the facts and circumstances of each case. A reasonable estimate of the current range is $60 000–$115 000. This role is an existing vacancy.





Bilingualism (French and English) is required for this position due to the nature of the role requiring interaction with national and global clients.

What you can expect from us:

Together, as owners, let’s turn meaningful insights into action.

Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you’ll reach your full potential because…

You are invited to be an owner from day 1 as we work together to bring our Dream to life. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction.

Your work creates value. You’ll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.

You’ll shape your career by joining a company built to grow and last. You’ll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.

At CGI, we value the strength that diversity brings and are committed to fostering a workplace where everyone belongs. We collaborate with our clients to build more inclusive communities and empower all CGI partners to thrive. As an equal-opportunity employer, being able to perform your best during the recruitment process is significant to us. If you require an accommodation, please inform your recruiter.

To learn more about accessibility at CGI, contact us via email. Please note that this email is strictly for accessibility requests and cannot be used for application status inquiries.

Come join our team—one of the largest IT and business consulting services firms in the world.

📌 Senior .NET Developer - Web and Mobile Application Security (Montreal)
🏢 CGI
📍 Montreal