Senior Software Developer - Full Stack

Randstad Canada; Toronto; On-site; CAD 90,000 - 120,000; Full time

Job summary

Randstad Canada in Toronto is seeking a Senior Software Developer - Full Stack with expert-level proficiency in the Microsoft .NET ecosystem and Azure Cloud platform to lead the design, technical implementation, and end-to-end delivery of modern multi-tier web applications.

In this role, you will hold engineering ownership across legacy and next-generation frameworks—ranging from classic ASP.NET Web Forms to decoupled Blazor WebAssembly architectures.

Qualifications

• 10+ years leading full-lifecycle software development in enterprise environments.
• Expert-level .NET stack experience: C#, Web API, Blazor WASM, .NET Core, EF, WCF.
• Azure security with Entra ID, OAuth, SSO, MFA and App registrations.
• Relational DB design/SQL in Oracle/SQL Server; TOAD/PLSQL Developer familiarity.
• Web UI with JavaScript, HTML5, CSS; WCAG AA and AODA compliance.
• Automated testing using xUnit and MOQ; API testing with Swagger/Postman/ThunderClient.

Responsibilities

• Design, build, test, and debug secure web apps bridging ASP.NET Web Forms to Blazor WASM on Azure.
• Architect and implement scalable RESTful API services with Web API and WCF.
• Configure authentication with Entra ID, OAuth, SSO, MFA; manage app registrations and policies.
• Model and optimize databases in Oracle/SQL Server; write advanced SQL, stored procedures.
• Build accessible, responsive UIs with JavaScript, HTML5, and CSS.
• Lead design reviews, enforce code quality, and mentor cross-functional teams.
• Validate API telemetry and CORS; conduct contract testing with Swagger, Postman, ThunderClient.
• Translate complex specs into ETL/data migration code; collaborate with stakeholders.

Skills

C#

Web API

Blazor WASM

.NET Core

LINQ

WCF

Entity Framework

Azure Entra ID

RESTful APIs

Security

Tools

TOAD

PL/SQL Developer

Swagger

Postman

ThunderClient

Xunit

MOQ

Redis Cache

Job description

We are seeking a highly accomplished Senior Software Developer - Full Stack with expert-level proficiency in the Microsoft .NET ecosystem and Azure Cloud platform to lead the design, technical implementation, and end-to-end delivery of modern multi-tier web applications. In this role, you will hold engineering ownership across legacy and next-generation frameworks—ranging from classic ASP.NET Web Forms to decoupled Blazor WebAssembly architectures. Operating across full-stack layers, you will design secure RESTful APIs, orchestrate enterprise identity integrations, optimize relational data schemas, and spearhead robust automated testing frameworks to deliver resilient, scalable, and highly compliant digital solutions.

Location: Toronto, ON (Fully Onsite - 5 days/week required)

Duration: 8-month contract.

Advantages

• Diverse Full-Stack Architecture Canvas: Command a comprehensive role that blends reliable enterprise .NET patterns with cutting-edge front-end WebAssembly frameworks and cloud-native microservices.
• Enterprise Security & Identity Sandbox: Master deep cloud identity engineering controls, managing cross-tenant configurations across modern security gateways like Microsoft Entra ID.
• Stable, Real-Time Synergy: Capitalize on a structured, fully onsite team environment engineered for rapid release deployment loops and cross-functional problem-solving.
• Legacy-to-Cloud Modernization Footprint: Drive valuable technical impact by steering data structures and application components from localized databases safely toward cloud ecosystems.

Responsibilities

• Full-Stack Application Engineering: Design, build, test, and debug secure web applications by bridging classic ASP.NET Web Forms environments with modern cloud-native architectures using .NET Core, C#, and Blazor WASM (WebAssembly).
• REST API & Cloud Integration Architecture: Architect and implement high-performance, scalable RESTful API services using Web API and WCF technologies, backed by distributed memory caching using Redis Cache.
• Identity Infrastructure & Secure Access: Configure enterprise-grade authentication frameworks, executing integrations with Microsoft Entra ID (OAuth), Single Sign-On (SSO), and Azure Multi-Factor Authentication (MFA), including the setup of Azure App registrations and token policies.
• Relational Database Design & Modeling: Model and optimize enterprise database structures for web platforms, writing sophisticated SQL queries, triggers, and stored procedures across Oracle and Microsoft SQL Server engines using tools like TOAD and PL/SQL Developer.
• Advanced Interface & Accessibility Engineering: Build semantic, multi-browser compliant web interfaces using JavaScript, HTML5, and CSS, ensuring complete alignment with the WCAG AA and AODA compliance regulations.
• Rigorous Code Verification & Testing: Establish a high-coverage quality standard across backend and API controllers, utilizing Xunit for unit testing and MOQ for structural mock layer generation.
• API Telemetry & Lifecycle Validation: Secure and test client and server-side Cross-Origin Resource Sharing (CORS) parameters, executing contract testing using utilities like Swagger, Postman, and ThunderClient.
• Data Flow & Conversion Optimization: Translate complex physical system specifications into working code, developing data integration transformations (ETL properties) to facilitate safe system migrations.
• Technical Collaboration & Walkthroughs: Lead design walkthrough sessions, manage code quality reviews, and communicate architectural dependencies to developers, business analysts, and project leadership.

Qualifications

• Core Systems Engineering Seniority: 10+ years of progressive professional experience leading full-lifecycle software development, application design, and system analysis within enterprise computing environments.
• Advanced Microsoft .NET Ecosystem Mastery: Expert-level development experience building data-driven systems utilizing C#, Web API, Blazor WASM, .NET Core, LINQ, WCF, and .NET Entity Framework.
• Azure Cloud Security Specialization: Demonstrated hands-on experience designing and securing API management environments inside the Azure Cloud, with specific competency managing Entra ID (OAuth), App Registrations, SSO, and Azure MFA.
• Database Modeling & Tooling Fluency: Strong background performing relational database design, data translation modeling, and query tuning inside Oracle or SQL Server using IDEs like TOAD or PL/SQL Developer.
• Web UI & Inclusivity Engineering: Advanced proficiency building responsive web layouts with JavaScript, Web Forms, and CSS, explicitly backed by a proven history of meeting WCAG AA and AODA compliance thresholds.
• API Telemetry & Testing Toolkit: Highly proficient writing automated test frameworks using Xunit and MOQ, paired with API testing literacy using Swagger, Postman, or ThunderClient.
• Soft Skills: Outstanding analytical problem-solving and critical-thinking mechanics, with a track record of driving technical alignment across matrix teams and meeting project deadlines.

Nice to Have

• Prior professional software development experience delivering full-stack solutions or database migrations within a Canadian public sector framework, ministry cluster, or highly regulated industry space.
• Foundational familiarity with complementary front-end JavaScript frameworks (such as Angular) or legacy Java application hosting spaces (WebLogic, Tomcat).

Summary

If you're interested in the "Senior Software Developer - Full Stack" 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!

Employer Commitment to Diversity, Equity, & Inclusion

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 [e-mail] to ensure their ability to fully participate in the interview process.

This posting is for existing and upcoming vacancies.