Senior.NET Developer - Web and Mobile Application Security

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
- Git Hub / 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 $60 –$ . This role is an existing vacancy.

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