Sr..NET Developer

Why is this Role Open?

Our client is undergoing a major modernization initiative within a core business platform. The organization is replacing a mission-critical legacy VB6 system and transitioning it to a modern .NET 10 solution. This is not simply a code conversion project. The team needs a Developer who can modernize legacy business functionality, convert legacy services into scalable API-driven architecture, validate and challenge architectural decisions, improve development standards, mentor junior developers, and bridge the gap between Architecture and Development teams. The objective is to ensure the modernized platform delivers the same or better functionality while positioning the business for long-term scalability, maintainability, and modernization.

What You’ll Do:

• Design, develop, and maintain .NET solutions
• Support migration from VB6 to .NET 10 · Build API-driven architecture
• Analyze and validate architectural solutions
• Participate in solution vetting and technical reviews
• Mentor junior developers
• Conduct code reviews
• Establish development best practices
• Support Azure cloud implementations
• Participate in Agile ceremonies
• Collaborate with business and technical stakeholders
• Ensure implementation aligns with architectural standards

Must-Have Skills:

• .NET / C# Development – Deep Senior-level experience with .NET technologies, architecture, and legacy modernization projects
• Azure & Azure DevOps – Experience working with cloud-based solutions, CI/CD pipelines, and Azure development environments
• SQL & API Development – Strong database expertise combined with experience designing and developing API-driven solutions

Why Join?

• Join a large-scale enterprise transformation initiative replacing critical legacy systems with modern technologies
• Play a key role in architecture discussions, solution reviews, and technical direction
• Mentor developers, establish best practices, and serve as a trusted technical advisor to the team
• Work with .NET 10, Azure, Azure DevOps, modern APIs, and cloud-native technologies
• Make a meaningful impact on a high-visibility modernization program with long-term business value

Job Type & Location

This is a Contract position based out of Waterloo, ON.

Pay and Benefits

The pay range for this position is $ - $

Workplace Type

This is a hybrid position in Waterloo,ON.

À propos de TEKsystems et TEKsystems Global Services

Nous sommes un fournisseur de services aux entreprises et de technologies. Nous accélérons la transformation de nos clients. Notre compétence en stratégie, conception, exécution et opérations libère la valeur de l’entreprise par un éventail de solutions. Nous sommes une équipe de 80 000 personnes qui collaborent avec plus de 60 000 clients, notamment 80 % du Fortune 500 en Amérique du Nord, Europe et Asie, qui collaborent avec nous dans le cadre de nos capacités full-stack et notre rythme. Nous sommes des penseurs stratégiques, des collaborateurs pratiques qui aident les clients à exploiter le changement et maîtriser le dynamisme de la technologie. Nous bâtissons le futur en livrant les résultats et en créant un impact positif dans nos communautés mondiales. TEKsystems et TEKsystems Global Services sont des entreprises d’Allegis Group. Découvrez d’autres informations à

Ordonnance sur l’égalité des chances de San Francisco: Conformément à l’Ordonnance sur l’égalité des chances de San Francisco, pour tous les postes situés dans la ville et le comté de San Francisco, nous examinerons les candidatures des personnes qualifiées ayant un casier judiciaire ou des antécédents criminels.

Utilisation de l’intelligence artificielle (IA): Nous pouvons utiliser l’intelligence artificielle (IA) pour soutenir certaines étapes de notre processus d’embauche, notamment la recherche, la présélection et l’évaluation des candidatures. L’IA aide à analyser les candidatures et les qualifications, mais les décisions finales sont prises par notre équipe de recrutement. En soumettant votre candidature, vous reconnaissez et acceptez que celle-ci puisse être examinée à l’aide d’outils d’IA.

About TEKsystems and TEKsystems Global Services

We’re a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We’re a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We’re strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We’re building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.econnaissez et acceptez que celle-ci puisse être examinée à l’aide d’outils d’IA.