Senior Frontend Software Engineer

We are seeking a highly accomplished Senior Software Developer - Front End for an enterprise-level contract opportunity based in Toronto. In this role, you will take on a premier engineering capacity within the front-end development stream, specializing in the architectural design, construction, optimization, and modernization of user-facing digital applications and high-performance Single Page Applications (SPAs).

As a principal front-end expert, you will bridge the gap between complex backend application data and accessible, intuitive user interfaces. Operating within a hybrid work model, you will provide critical technical leadership across all phases of the development lifecycle—translating user stories and technical specifications into clean, reusable code. This role demands an expert who can confidently manage component architectures, lead root-cause diagnostics during outages, and enforce strict web accessibility compliance across web and mobile layouts.

Contract Duration: 6 months (with a 6-month optional extension)

Full Component Ownership: Take independent engineering control over large-scale, client-facing web components, from early layout architecture to continuous testing and deployment.

Modern Integration Depth: Advance your front-end capabilities by engineering dynamic data-ingestion layers connecting reactive interfaces with complex RESTful APIs.

Serve as the team's digital accessibility champion, ensuring that core digital products deliver universal usability across Web, iOS, and Android formats.

Interface directly with business analysts, system architects, and executive teams to shape future-state digital solutions.

Front-End Engineering & Lifecycle Delivery

Design, develop, upgrade, test, and implement high-quality software components for client applications and responsive Single Page Applications (SPAs).

Coordinate enhancements across a suite of complex digital applications, utilizing cutting-edge software engineering principles and component patterns.

Formulate robust data-fetching mechanics to integrate user interfaces smoothly with backend RESTful web services handling JSON and XML payloads.

Manage, update, and validate application layouts to ensure a seamless and pixel-perfect user experience across both desktop online views and mobile viewports.

Participate actively in rigorous code reviews, applying corrections and maintaining compliance with established naming, design, and formatting rules.

Technical Architecture & System Governance

Act as an independent technical authority to structure front-end application architectures, data flow pathways, and interface integrations with minimal supervision.

Create, refine, and maintain key architectural documentation, including comprehensive system design blueprints, component layouts, and data dependency diagrams.

Execute thorough root cause analyses during unanticipated system outages, delivering rapid troubleshooting, debugging recommendations, and technical resolutions to preserve platform availability.

Adhere strictly to institutional change control policies, ensuring code deployment sequences are fully audited, safe, and transparent.

Requirements Elicitation, Compliance & Training

Ensure all web architectures strictly comply with digital accessibility standards (WCAG 2.x AA, AODA, and WAI-ARIA specifications) while optimizing accessibility attributes across web and mobile platforms.

Author and update highly organized user documentation, technical specifications, operational playbooks, and end-user training guides to support system rollouts.

Provide active professional mentoring, technical onboarding guidance, and collaborative support to a multi-disciplinary, cross-functional project team.

Core Technical & Front-End Requirements

Professional Frontend Development Tenure: Extensive experience operating as a Senior Front End Developer or Technical Lead building and maintaining large-scale enterprise information technology applications.

Deep, hands-on expertise engineering Single Page Applications (SPAs) utilizing HTML5, CSS3, JavaScript (ES6+), jQuery, and Bootstrap.

Proven track record designing and scaling web components using modular UI engines and architectural libraries (such as React and Backbone).

API Integration Depth: High proficiency executing asynchronous data ingestion and interface connectivity with RESTful APIs handling JSON and XML data structures.

Advanced Diagnostics & Debugging: Exceptional critical thinking and troubleshooting capabilities to run root-cause analysis, trace environmental layout bugs, and optimize data integrity.

Specialized Accessibility & Testing Attributes

Digital Accessibility Champion: Extensive practical experience engineering digital products that strictly align with web accessibility legislation (AODA, WCAG 2.x AA, and WAI-ARIA) across Web, iOS, and Android platforms.

Quality Assurance Acumen: Solid background managing QA/UAT feedback loops, drafting comprehensive functional test scenarios, and executing risk assessments for client applications.

Agile Pipeline Fluidity: Practical experience executing software delivery within structured Agile/Scrum project teams, managing feature branch architectures and source repositories.

Education & Industry Domain Assets

Education: Post-secondary education in Computer Science, Software Engineering, or a related quantitative discipline, or an approved equivalent combination of verified education and hands-on technical leadership experience.

Public Sector Exposure: Prior experience working within government jurisdictions, broader public sector frameworks, or highly regulated corporate settings is considered a strong asset.

Soft Skills: Outstanding verbal and written communication skills, with polished ease when presenting detailed design specifications, risk evaluations, and technical options to both technical squads and business partners.

If you're interested in the Senior Software Developer- Front End role based in Toronto, we encourage you to apply online at Only qualified candidates will be contacted for the next steps. 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.