senior software developer.

We are seeking a highly accomplished Senior Software Developer for an enterprise-level contract opportunity based in Toronto. In this role, you will take on a premier frontend architecture, digital portal development, and technical delivery capacity, specializing in designing and building scalable, public-facing digital registration and permit solutions.

As a Senior Software Developer, you will bridge the gap between user-centered interface design, middleware services, and enterprise back-office applications. Operating fully onsite in Toronto, you will lead the design and development of modern, accessible web portals using React, Next.js, and TypeScript, integrating directly with enterprise middleware (MuleSoft) and CRM back-office platforms (Microsoft Dynamics CRM). This position demands a seasoned development authority with extensive full-lifecycle software delivery tenure, robust modern JavaScript/TypeScript framework expertise, and a commitment to delivering accessible, responsive, and resilient enterprise applications.

Location: Toronto, ON

Assignment Type: Onsite (5 days per week)

Contract Duration: 7-month contract (with potential for extension)

Advantages
Modern Web Stack: Architect and develop public-facing applications using React, Next.js, TypeScript, and modern asynchronous frameworks.

Complex Enterprise Integrations: Gain hands-on exposure connecting digital portals with MuleSoft middleware and Microsoft Dynamics CRM.

High-Impact Public Portals: Lead the engineering of high-visibility registration and permit platforms serving a broad user base.

Technical Leadership & Innovation: Drive modern UI/UX design, AODA accessibility standards, and AI-assisted developer productivity workflows.

Responsibilities
Translate complex business requirements and functional specifications into scalable, secure, and fully responsive web applications.

Lead the end-to-end frontend architecture, design, and implementation of public-facing registration and permit web portals using React, Next.js, and TypeScript.

Design and implement clean, reusable UI components adhering to modern responsive design principles, HTML5, CSS3, and modern frontend design systems.

Integrate frontend applications with enterprise back-office systems (Microsoft Dynamics CRM) via RESTful APIs and MuleSoft middleware services.

Ensure all digital interfaces strictly adhere to accessibility regulations and web standards, including WCAG and AODA compliance.

Apply object-oriented principles, modern design patterns, and clean code methodologies across the entire application lifecycle.

Utilize asynchronous reactive programming techniques with RxJS alongside Node.js/NPM tooling for optimized state management and performance.

Mentor and provide technical leadership to intermediate and junior developers, conducting design walkthroughs and code reviews.

Coordinate technical delivery with cross-functional teams, including solution architects, quality assurance analysts, and business stakeholders.

Troubleshoot and resolve complex application bugs, frontend performance bottlenecks, and cross-browser compatibility issues.

Maintain version control best practices and release management workflows utilizing Git.

Author detailed technical documentation, component architecture designs, and implementation runbooks to support ongoing platform sustainment.

Qualifications
Core Technical & Frontend Engineering Requirements
Enterprise Development Tenure: Minimum 10+ years of professional experience as a software designer and developer building large-scale, multi-tier web applications.

Modern JavaScript & TypeScript: Minimum 5+ years of hands-on experience developing enterprise web solutions using TypeScript and modern JavaScript.

React Ecosystem: Minimum 5+ years of dedicated experience building component-driven frontends using React, supported by hands-on delivery experience with Next.js and Vue.js.

Web Fundamentals & Styling: Minimum 5+ years of hands-on expertise with HTML5, CSS3, Bootstrap, and responsive web design frameworks.

Package Management & Tooling: Minimum 5+ years of experience working with Node.js environments and NPM.

Reactive & Asynchronous Programming: Minimum 5+ years of experience utilizing RxJS and modern state management patterns.

API Integration: Proven expertise integrating user interfaces with RESTful APIs, web services, and enterprise middleware layers.

Version Control: Minimum 3+ years of experience using Git for source code control and collaborative branching strategies.

Accessibility Standards: Demonstrated hands-on experience implementing web accessibility standards adhering to AODA and WCAG guidelines.

Preferred Technical Assets & Industry Background
Enterprise Architecture: Experience designing applications within microservices-based architectures and integrating with middleware platforms such as MuleSoft.

CRM & Back-Office Integration: Familiarity with Microsoft Dynamics CRM or similar enterprise back-office platforms.

Public Sector Context: Prior experience delivering web applications or modern digital services within public sector environments is considered an asset.

Productivity Innovation: Familiarity leveraging modern developer AI productivity tooling (e.g., Microsoft Copilot, LLM-based coding assistants).

Soft Skills & Delivery Attributes
Technical Mentorship: Strong leadership and coaching capabilities to guide development teams and champion software engineering best practices.

Stakeholder Management: Excellent verbal and written communication skills with the ability to convey architectural approaches and trade-offs clearly to diverse stakeholders.

Problem Solving & Delivery: Exceptional analytical problem-solving skills with a track record of meeting delivery milestones and resolving technical bottlenecks effectively.

Summary
If you're interested in the "Senior Software Developer" role based in Toronto, we encourage you to apply online at
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 View email address on randstad.com to ensure their ability to fully participate in the interview process.

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