Senior Software Developer - Full Stack

We are seeking a highly accomplished Senior Software Developer - Full Stack to lead the technical design, architectural implementation, and modernization of cloud-native web applications and multi-tier enterprise solutions. In this role, you will take technical ownership of the entire solution architecture—spanning complex user interfaces, secure RESTful API layers, and highly optimized database frameworks. Working within an Agile/Scrum delivery environment, you will collaborate with cross-functional product squads to translate user stories, storyboards, and structural data models into high-performance, secure, and fully accessible software products.

Location: Toronto, ON (Onsite / Hybrid TBD)

Duration: 9-month contract.



Advantages
Architectural Authority: Command a primary technical role shaping the solution architecture for high-profile cloud-native applications and Minimum Viable Products (MVPs).

Premium Modern Stack Integration: Solidify your engineering footprint by combining cutting-edge frameworks (Next.js/React) with powerful backend engines (Node.js/Entity Framework) and automation lifecycles.

Cross-Functional Influence: Act as a central consultative expert bridging technical capabilities with UX Designers, Business Analysts, and Cloud Architects.

Stable High-Visibility Runway: Secure a 9-month engagement dedicated entirely to complex engineering, technical modernization, and institutional knowledge transfer.



Responsibilities
Full-Stack Technical Leadership: Lead the end-to-end design, construction, and deployment of scalable web architectures, ensuring the entire application stack is optimized for maximum speed and performance.

Modern Front-End Engineering: Architect and develop clean, modular, and responsive user interfaces using React and Next.js frameworks powered by JavaScript and TypeScript.

Back-End & API Design: Design, build, and maintain highly available REST APIs and server-side logic utilizing Node.js or modern Java enterprise models (Spring Boot).

Data Layer Architecture: Oversee relational database design, data persistence pipelines, and schema deployment utilizing Object-Relational Mapping (ORM) data access tools (such as Entity Framework or JPA) alongside complex SQL querying.

Accessibility Compliance: Ensure all front-end digital experiences strictly conform to the Web Content Accessibility Guidelines (WCAG) and regional digital inclusion legislation (AODA standards).

DevOps Pipeline Maintenance: Assist in supporting, scaling, and automating continuous integration and continuous deployment (CI/CD) release workflows.

Quality & Performance Validation: Partner with QA squads to facilitate automated testing streams, covering unit tests, penetration vulnerability scans, performance load testing, and accessibility checks.

Structural Design Artifacts: Create advanced object-oriented models in UML using enterprise design tools (such as Power Designer) to map technical execution paths.

Tier-3 Operations & Support: Provide critical support for complex production applications—diagnosing root-cause incidents, implementing long-term technical bug fixes, and delivering post-implementation support.

Documentation & Knowledge Transfer: Author comprehensive implementation packages (Method of Procedure documents), operational guidelines, and technical specification sheets while providing structured mentorship to internal staff.



Qualifications
Core Full-Stack Seniority: 8+ years of progressive professional experience serving as a Software Designer and Developer, with a dedicated focus on building complex, multi-tiered application environments.

Front-End Framework Mastery: Expert, hands-on development experience implementing web applications using React and Next.js ecosystems natively driven by JavaScript and TypeScript.

Backend API Engineering Toolkit: Proven capability constructing and integrating secure REST APIs and server-side application logic using Node.js or Java EE (Spring Boot/MVC frameworks).

ORM & Database Acumen: Strong practical experience utilizing Entity Framework (or equivalent Object-Relational Mapping tools) combined with relational database design and advanced SQL scripting.

Accessibility Engineering Fluency: Thorough operational knowledge of building applications that strictly comply with WCAG guidelines for web application development and AODA standards.

Methodological Fluency: Solid practical experience delivering production code under structured Agile/Scrum methodologies, managing sprint backlogs, and reviewing user stories.

Analytical Problem Solving: Exceptional analytical, decision-making, and software troubleshooting capabilities, with a verified record of translating abstract architecture models (UML) into production software.

Soft Skills: Outstanding consultative, negotiation, and verbal/written communication mechanics, with an established history of conducting technical design walkthroughs and coordinating multi-disciplinary teams.



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!

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.