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 full-stack engineering and technical leadership capacity, specializing in the analysis, design, development, and integration of large-scale, multi-tier systems.

As a principal software developer, you will bridge the gap between business requirements, solution architecture, and hands-on application execution. Operating fully onsite in Toronto, you will lead full SDLC activities—translating requirements into conceptual, logical, and physical architecture artifacts, coding complex REST and SOAP web services, designing responsive user interfaces, and leading cross-functional developer teams. This position demands a technical authority who can troubleshoot complex system incidents, execute code walkthroughs, optimize multi-tier applications, and ensure all deliverables conform to strict enterprise standards.

Location: Toronto, ON

Assignment Type: Onsite

Contract Duration: 6-month contract (with potential for extension)

Advantages

End-to-End Enterprise Stack: Drive full-stack design and integration across REST APIs, SOAP/WSDL services, JSON/XML messaging, and modern UI frameworks.

Technical Leadership & Mentorship: Lead development teams, guide systems analysts, and conduct formal design and code walkthroughs.

Multi-Platform Systems Scope: Gain exposure across enterprise environments spanning web, desktop, application servers, and relational database systems.

Complex Problem Solving: Direct system refactoring, performance optimization, and root-cause incident resolution for high-impact applications.

Responsibilities
Collaborate closely with business analysts to perform detailed requirements analysis and technical feasibility assessments.

Author comprehensive solution design and architecture artifacts, including conceptual, logical, and physical models.

Complete architecture checkpoint activities, support governance reviews, and lead technical design walkthroughs.

Develop, code, and integrate multi-tier full-stack application components, REST APIs, SOAP web services, and user interface components.

Build unit and integration test cases, execute component testing, and collaborate with QA teams to support functional, performance, and security testing.

Investigate, diagnose, and resolve technical incidents, leading root-cause analyses and system optimizations.

Direct and lead development teams, assigning work packages and ensuring deliverables align with project parameters and ITIL best practices.

Prepare comprehensive technical documentation, deployment guides, user manuals, and conduct knowledge transfer walkthroughs for project teams.

Partner with project managers, technical leads, and external service delivery partners to ensure seamless solution delivery.

Qualifications
Core Technical & Systems Engineering Requirements
IT Systems Development Experience: 10+ years of demonstrated experience in systems analysis, design, coding, and integration across multi-platform and multi-tier enterprise environments.

Full-Stack & Integration Mastery: Advanced knowledge and hands-on experience with REST APIs, SOAP/WSDL web services, JSON/XML messaging, UI frameworks/libraries, and third-party service integrations.

Multi-Platform Stack Exposure: Proven experience across enterprise technologies including JEE/JEE components (JSP, Servlets, EJB, JDBC, JMS), Struts, .NET, application servers (Tomcat, WebLogic, WebSphere), operating systems (Windows, Solaris), and Oracle PL/SQL.

Development & Modeling Tools: Hands-on proficiency with design and IDE tools such as MS Visio, PowerDesigner, Eclipse, JetBrains IntelliJ, and VS Code.

Methodologies & ITIL: In-depth understanding of enterprise systems analysis methodologies, work estimation techniques, project management frameworks, and ITIL best practices.

Preferred Assets & Technical Capabilities
Public Sector Context: Familiarity with government strategies, directives, security/privacy baselines, and architecture governance checkpoints.

Security Protocols: Knowledge of security standards, PKI, VPNs, LDAP, and secure application packaging.

Soft Skills & Leadership Attributes
Technical Leadership: Proven ability to lead developers and testers, direct technical staff, and manage service delivery partners.

Analytical Problem Solving: Superior diagnostic capabilities for system debugging, refactoring, and technical incident resolution.

Consultative Communication: Outstanding written, verbal, negotiation, and stakeholder engagement skills to explain complex solutions to technical and non-technical audiences.

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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