Senior Developer

We are seeking a highly accomplished Senior Developer for an enterprise-level contract opportunity based in Toronto. In this role, you will take on a premier software engineering and database modernization capacity, specializing in full-stack .NET application development, database migrations, and enterprise reporting integration.

As a principal developer, you will bridge the gap between complex legacy systems, modern cloud-ready database architectures, and operational support teams. Operating within a hybrid work model, you will lead application upgrades to modern .NET frameworks, execute database migrations from Oracle to SQL Server, build automated data integration pipelines using SSIS, and remediate defects identified during Quality Assurance (QA) and User Acceptance Testing (UAT). This position demands a seasoned technical authority who can optimize application performance, author comprehensive operational support documentation, and deliver structured coaching and knowledge transfer to junior developers and operational staff.

Location: Toronto, ON

Assignment Type: Hybrid (2 to 3 days per week onsite)

Contract Duration: 3-month contract (with potential for extension

Advantages
Full-Stack Modernization Scope: Direct high-visibility application upgrades transitioning projects to modern .NET and SQL Server environments.

Database & Data Pipeline Architecture: Lead database migrations from Oracle 12c to SQL Server, developing SSIS packages and data transformation workflows.

Multi-Platform Analytics Integration: Build and integrate enterprise reports using Crystal Reports, BusinessObjects Enterprise (BOE), and Power BI.

Capacity Building & Leadership: Conduct structured coaching, training, and technical knowledge transfer to strengthen internal developer teams.

Responsibilities
Design, code, test, and implement application enhancements and system modernization initiatives.

Execute end-to-end database migrations from legacy Oracle 12c environments to SQL Server Enterprise databases.

Upgrade core application frameworks to modern .NET standards, ensuring performant, secure, and maintainable codebases.

Design, build, and optimize SSIS packages, interfaces, and automated data integration processes.

Develop, convert, and integrate enterprise reports using Crystal Reports, BusinessObjects Enterprise (BOE), and Power BI.

Provide dedicated technical support and defect remediation across System Integration Testing (SIT), Quality Assurance (QA), and User Acceptance Testing (UAT) phases.

Perform deep technical troubleshooting, debugging, and query optimization to resolve application and database bottlenecks.

Support initial production implementations, phase enhancements, and post-go-live stabilization.

Author comprehensive technical system support documentation, operational runbooks, and technical troubleshooting guides.

Deliver structured coaching, training sessions, and technical knowledge transfer to junior developers and operational support teams for long-term system sustainability.

Qualifications
Core Technical & Engineering Requirements
Full-Stack .NET Expertise: Extensive experience developing enterprise web applications and APIs using ASP.NET Core, ASP.NET Web APIs/REST APIs, and ASP.NET Core MVC.

Framework Upgrades & Development: Hands-on experience developing with Microsoft .NET frameworks, including upgrading applications across major framework versions.

Database Migration & SQL Mastery: Proven experience with Oracle 19c/12c and SQL Server, including direct project experience migrating databases from Oracle to SQL Server Enterprise editions.

Data Integration & SSIS: Strong background developing SQL Server Integration Services (SSIS) packages, data pipelines, and complex data migration workflows.

Reporting Ecosystem: Hands-on experience converting and integrating Seagate Crystal Reports with BusinessObjects Enterprise (BOE) and building Power BI reports.

UI Frameworks & Testing: Proficiency using modern UI frameworks (such as Telerik UI) and operating within structured QA, UAT, and production release processes.

Preferred Assets & Certifications
Certifications: Microsoft .NET Developer certifications are considered a strong asset.

Security & Front-End Frameworks: Experience with OWASP security testing methodologies and JavaScript frameworks (such as Angular).

Domain Exposure: Background developing sales, inventory management, or costing platforms is an asset.

Soft Skills & Collaboration
Analytical Problem Solving: Superior diagnostic, debugging, and performance optimization capabilities to resolve complex technical defects.

Mentorship & Communication: Outstanding verbal and written communication skills with a proven track record of authoring technical documentation and mentoring junior technical staff.

Summary
If you're interested in the "Senior Developer" role based in Toronto, we encourage you to apply online at www.randstad.ca.
Only qualified candidates will be contacted for the next steps. We look forward to hearing from you!

Randstad Canada is committed to fostering a workforce reflective of all peoples of Canada. As a result, we are committed to developing and implementing strategies to increase the equity, diversity and inclusion within the workplace by examining our internal policies, practices, and systems throughout the entire lifecycle of our workforce, including its recruitment, retention and advancement for all employees. In addition to our deep commitment to respecting human rights, we are dedicated to positive actions to affect change to ensure everyone has full participation in the workforce free from any barriers, systemic or otherwise, especially equity-seeking groups who are usually underrepresented in Canada's workforce, including those who identify as women or non-binary/gender non-conforming; Indigenous or Aboriginal Peoples; persons with disabilities (visible or invisible) and; members of visible minorities, racialized groups and the LGBTQ2+ community.

Randstad Canada is committed to creating and maintaining an inclusive and accessible workplace for all its candidates and employees by supporting their accessibility and accommodation needs throughout the employment lifecycle. We ask that all job applications please identify any accommodation requirements by sending an email to accessibility@randstad.ca to ensure their ability to fully participate in the interview process.