senior software developer.

We are seeking a highly accomplished Senior Software Developer with master-level expertise in n-tier enterprise architectures to lead the full-stack engineering, database design, and deployment of mission-critical business applications. In this role, you will take technical ownership of translating complex business specifications into scalable, secure, and accessible software solutions. Operating across modern frontend and backend frameworks, you will build data-driven applications, design optimized data schemas, and spearhead tier-3 environment triage—ensuring absolute system reliability and code maintainability.

Location: Toronto, ON (Fully Onsite - 5 days/week at 222 Jarvis St.)

Duration: 12-month contract

Advantages
Core Architectural Authority: Command the technical development path, pattern selection, and physical blueprint execution for high-visibility enterprise platforms.

Modern Multi-Model Tech Stack: Solidify your technical footprint combining enterprise Java ecosystems with cutting-edge frontend libraries and distributed NoSQL/relational hybrid data tiers.

Onsite Collaboration Hub: Gain immediate, face-to-face team synergy, rapid alignment loops, and visibility inside a central, structured provincial IT workspace.

Long-Term Strategic Impact: Establish a secure 12-month contract foundation overseeing full-lifecycle systems analysis, migration strategies, and platform rollouts.

Responsibilities
N-Tier Full-Stack Engineering: Lead the end-to-end design, construction, programming, and environment deployment of secure, high-performance n-tier enterprise applications.

Backend API Architecture: Design and build decoupled backend microservices, transaction pipelines, and secure RESTful APIs leveraging Spring Boot frameworks.

Object-Relational Persistence: Manage complex data persistence layers, caching, and mapping strategies utilizing JPA or Hibernate.

Modern Interface Engineering: Construct modern, responsive, and intuitive web user interfaces powered by React (or Angular) using JavaScript and TypeScript.

Advanced Database Design & Programming: Architect database schemas, index strategies, and write highly optimized programmable logic (PL/pgSQL) across PostgreSQL and distributed Azure Cosmos DB cloud data stores.

Requirements Translation & Architecture Mapping: Elicit, analyze, and document low-level programming specifications and data mapping criteria directly from diverse business stakeholders and subject matter experts (SMEs).

Quality Assurance & Verification: Design and execute automated unit, integration, and end-to-end regression scripts, leading code reviews and driving continuous deployment (CI/CD) pipelines.

Tier-3 Troubleshooting & Environment Triage: Conduct forensic root-cause analysis to debug, patch, and resolve deep-seated application bottlenecks and data migration issues across testing and production footprints.

Security & Accessibility Compliance: Ensure all digital interaction layers adhere strictly to PCI DSS transaction security rules and regional digital accessibility mandates (AODA / WCAG standards).

Technical Mentorship & Collaboration: Lead technical design walkthroughs, collaborate on deployment scripts, and provide consultative knowledge transfer across the project delivery team.

Qualifications
N-Tier Enterprise Seniority: 10+ years of progressive professional experience in full-lifecycle software engineering, systems analysis, and application design within large-scale n-tier enterprise landscapes.

Java Persistence & Framework Mastery: Deep, expert-level development experience building robust API layers using Spring Boot Framework combined with JPA or Hibernate data access models.

Advanced Database Proficiency: Demonstrated hands-on expertise performing relational database design, writing complex SQL, and tuning stored procedures in PostgreSQL (PL/pgSQL) along with cloud-native document architectures like Azure Cosmos DB.

Modern Frontend Tooling Fluency: Strong professional development experience writing scalable web clients utilizing React and TypeScript/JavaScript frameworks.

Requirements Engineering Competency: Proven experience engaging business units to gather requirements, abstracting technical layouts, and creating detailed programming documentation.

Deployment & Middleware Exposure: Practical understanding of application deployment scripts, middleware components, API gateways, and web communication protocols (REST/

Soft Skills: Elite analytical, problem-solving, and negotiation mechanics, with an established history of leading design walkthroughs and articulating complex dependencies to both engineering squads and non-technical managers.

Nice to Have:
Prior professional experience delivering public-sector internet-facing applications or working with Rapid Application Development (RAD) styles.

Direct working knowledge of data protection frameworks, specifically PCI DSS compliance.

Functional understanding of digital inclusion regulations, including AODA and WCAG compliance.

Summary
If you're interested in this "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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