Senior .NET Developer

Senior.NET Developer

CGI is seeking an experienced Senior.NET Developer to join our Applications Development and Maintenance team supporting a large metropolitan client's IT Application environment. This role offers the opportunity to work in a sophisticated, enterprise-scale technology environment and contributes to the development, modernization, and ongoing support of critical business applications.

Location: Candidates should reside within commuting distance of one of our CGI offices in Wausau, WI; Lafayette, LA; Belton, TX; Knoxville, TN; Mobile, AL; Troy, AL; Lebanon, VA; or Henderson, NV.

Work Model: Hybrid preferred. Remote work may be considered for highly qualified candidates.

How We're Transforming Government

We use technical expertise and secure solutions to help government reinvent the ways of working to improve citizen services and increase efficiency. Our work helps civil entities provide services transparently and with fewer resources.

Your Future Duties and Responsibilities

• Design, develop, test, implement, and support enterprise web applications using the.NET platform, C#, and ASP.NET

• Translate business and technical requirements into scalable, secure, and maintainable software solutions

• Serve as a technical subject matter expert for assigned solutions and act as a key point of contact between vendors and the development team to resolve complex technical issues

• Participate in project planning and requirements-gathering sessions with technical and functional leads, business analysts, and other stakeholders to analyze business needs and define proposed IT solutions

• Develop technical specifications and contribute to application architecture, system design, data flow, and integration strategies

• Participate in design and architecture reviews, ensuring solutions align with established technical standards and architectural specifications

• Incorporate security requirements and industry best practices into application design and development

• Participate in code reviews to ensure code quality, maintainability, security, and adherence to development standards

• Troubleshoot and resolve complex application and code-related issues in collaboration with QA and other technical teams

• Provide hands-on technical guidance, coaching, and mentoring to senior and junior developers throughout all phases of the project lifecycle

• Provide technical leadership from project initiation through implementation, with an emphasis on sound architecture, reusable solutions, development best practices, and creative problem-solving

• Act as an independent technical advisor on complex phases of system design, programming, implementation, integration, and analysis

• Lead or contribute to major system design, development, modernization, and implementation initiatives

• Gather and analyze system requirements, develop technical specifications, and write software in accordance with established standards

• Perform quality reviews of code and technical designs and support continuous improvement of development practices and processes

• Collaborate effectively with cross-functional teams in a multidisciplinary and fast-paced environment

Required Qualifications to Be Successful in This Role

• 5+ years of hands-on software development experience, with a focus on developing enterprise web applications

• Strong understanding of the Software Development Life Cycle (SDLC), including requirements and issue management, defect tracking, source control, build and test automation, and release management

• General technical application support experience with a solid understanding of enterprise IT concepts, including application troubleshooting, infrastructure, networking, operating systems, and databases. Experience with additional programming languages and technologies is an asset

• Proven experience designing and developing applications using the .NET platform, C#, and ASP.NET

• Demonstrated experience with TFS/Azure DevOps Server, JIRA, Confluence, or similar development and collaboration tools

• Strong knowledge of software version control concepts and change management processes

• Strong understanding of data modeling principles and relational database concepts

• Hands-on database experience with Microsoft SQL Server (T-SQL) and/or MySQL

• Working knowledge of software architecture and development patterns, including MVC, MVVM, Domain-Driven Design (DDD), Test-Driven Development (TDD), and CI/CD

• Strong understanding of authentication, authorization, and application security concepts

• Experience developing and integrating web services and APIs

• Experience with front-end development technologies, including jQuery, CSS, and HTML5

• Experience conducting application security code reviews and/or application vulnerability assessments

• Strong written, verbal, and interpersonal communication skills

• Demonstrated ability to learn, adopt, and implement new technologies based on evolving client and business needs

• Ability to work effectively in a rapidly changing environment while managing priorities, meeting deadlines, maintaining high-quality standards, and responding flexibly to customer needs

• Familiarity with modern AI-assisted software development and coding platforms, such as Claude Code, GitHub Copilot, or ChatGPT Codex

Nice-to-Have Qualifications:

• Experience working in major cloud environments, including AWS, Google Cloud Platform (GCP), or Microsoft Azure

• Experience with Model Context Protocol (MCP)

• Experience designing, developing, or supporting data pipelines

• Experience with containerization and orchestration technologies, including Docker, Docker Compose, and Kubernetes

• Exposure to Oracle 11g/12c

• Experience designing and developing solutions using Windows Workflow Foundation (WF)

• Hands-on experience with dashboard, reporting, and business intelligence platforms, such as Tableau, Salesforce, or Microsoft Dynamics

• Experience developing accessible applications that comply with ADA and WCAG 2.1 Level AA standards

Minimum Education Required:

Associate degree in Computer Science, Information Technology, Engineering, or a related field, or equivalent combination of education and professional experience.

CGI is required by law in some jurisdictions to include a reasonable estimate of the compensation range for this role. The determination of this range includes various factors not limited to skill set, level, experience, relevant training, and licensure and certifications. To support the ability to reward for merit based performance, CGI typically does not hire individuals at or near the top of the range for their role. Compensation decisions are dependent on the facts and circumstances of each case. A reasonable estimate of the current range for this role in the U.S. is $80,600.00 $141,100.00.

CGI's benefits are offered to eligible professionals on their first day of employment to include:

• Competitive compensation
• Comprehensive insurance options
• Matching contributions through the 401(k) plan and the share purchase plan
• Paid time off for vacation, holidays, and sick time
• Paid parental leave
• Learning opportunities and tuition assistance
• Wellness and well being programs

CGI anticipates accepting applications for this position through 2026 09 22.

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.

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

Qualified applicants will receive consideration for employment without regard to their race, ethnicity, ancestry, color, sex, religion, creed, age, national origin, citizenship status, disability, pregnancy, medical condition, military and veteran status, marital status, sexual orientation or perceived sexual orientation, gender, gender identity, and gender expression, familial status or responsibilities, reproductive health decisions, political affiliation, genetic information, height, weight, or any other legally protected status or characteristics to the extent required by applicable federal, state, and/or local laws where we do business.

CGI provides reasonable accommodations to qualified individuals with disabilities. If you need an accommodation to apply for a job in the U.S., please email