Senior Software Developer - Toronto

We are seeking a highly accomplished Senior Software Developer for an enterprise contract opportunity based in Toronto. In this role, you will take on a premier full-stack software engineering, application architecture, and technical delivery capacity, specializing in the design, development, and enhancement of scalable, multi-tier enterprise solutions.
As a Senior Software Developer, you will bridge the gap between business requirements, complex backend architectures, responsive modern frontends, and relational/NoSQL data platforms. Operating fully onsite in Toronto, you will lead the implementation of secure RESTful APIs and microservices using Java and Spring Boot, build user-friendly and accessible user interfaces using React and Angular, and design high-performance database schemas across PostgreSQL, PL/pgSQL, and Azure Cosmos DB. This position demands a seasoned development authority with extensive full-lifecycle software delivery tenure, robust automated testing and CI/CD capabilities, and a commitment to delivering resilient, high-quality enterprise applications.
Location: Toronto, ON
Assignment Type: Onsite (5 days per week)
Contract Duration: 10-month contract (with potential for extension)
Advantages
Modern Full-Stack Stack: Hands‑on development across Spring Boot, Java, React, TypeScript, and modern JavaScript frameworks.
Diverse Data Ecosystem: Architect enterprise data solutions using PostgreSQL, PL/pgSQL, Azure Cosmos DB, and Redis caching.
Cloud & Microservices Scope: Build and deploy scalable microservices leveraging Microsoft Azure services and modern API patterns.
Comprehensive Quality Engineering: Lead automated testing frameworks across JUnit 5, Mockito, Jest, and Playwright within CI/CD pipelines.
Responsibilities
Translate business requirements and technical systems specifications into scalable, secure, and fully tested enterprise applications.
Develop detailed technical designs, architecture patterns, and programming specifications for n-tier application frameworks.
Design, build, and maintain robust backend microservices, RESTful APIs and batch processes utilizing Spring Boot and the broader Spring Framework.
Design and implement modern, responsive, and accessible UI components and web applications utilizing React, Angular, TypeScript, and modern JavaScript.
Architect and optimize database structures, normalization models, indexing strategies, stored procedures, and functions in PostgreSQL, PL/pgSQL and Azure Cosmos DB.
Implement data persistence layers and object-relational mapping utilizing JPA, Hibernate, or MyBatis.
Integrate caching solutions and middleware adapters using tools such as Redis to maximize backend throughput and minimize latency.
Build, maintain, and execute automated test suites spanning unit, integration, API and end-to-end testing utilizing JUnit 5, Mockito, Jest and Playwright.
Troubleshoot, debug, and resolve complex application errors, performance bottlenecks, and integration defects across development, test and production environments.
Support application deployments, data conversions, migrations and system integration testing in close collaboration with infrastructure and DevOps teams.
Ensure all application interfaces comply with corporate security standards, performance benchmarks, and accessibility regulations (AODA/WCAG).
Participate actively in Agile sprint ceremonies, technical design walkthroughs, backlog refinements and peer code reviews.
Qualifications
Core Technical & Application Development Requirements
Enterprise Development Tenure: Minimum 10+ years of hands‑on professional experience developing scalable, n-tier enterprise software applications.
Backend Architecture (Java / Spring): Deep expertise in application design and microservices architecture using Java, Spring Boot, and the Spring ecosystem (Core, MVC, Security, Data, Batch).
Modern Frontend Frameworks: Demonstrated proficiency building component-based, responsive web applications using JavaScript/TypeScript alongside React or Angular.
Database & ORM Mastery: Strong expertise in database design, SQL development, and query tuning with PostgreSQL, PL/pgSQL, and Azure Cosmos DB, alongside hands‑on experience with ORM frameworks (JPA, Hibernate, MyBatis).
Application Design Patterns: Proven expertise in modern design patterns (MVC, integration patterns, caching strategies), application performance optimization and troubleshooting.
Test Automation & Quality Engineering: Strong experience in automated testing across the test pyramid, including JUnit 5, Mockito, Jest, and modern end-to-end testing frameworks (Playwright, Katalon).
Requirements Elicitation: Proven experience gathering, analyzing and documenting technical and functional requirements from business stakeholders and subject matter experts.
Preferred Technical Assets & Methodologies
Cloud Platforms: Hands‑on experience deploying and supporting cloud-native applications on Microsoft Azure (Azure App Services, Azure Functions, Azure Storage, and Azure Database for PostgreSQL).
Accessibility Standards: Knowledge and practical understanding of the Accessibility for Ontarians with Disabilities Act (AODA) and WCAG compliance standards.
Agile Delivery: Solid track record working within structured Agile/Scrum delivery environments with CI/CD integration.
Enterprise Integration: Experience with API gateways, messaging queues, or enterprise service integration platforms.
Soft Skills & Delivery Attributes
Analytical Problem Solving: Superior diagnostic and analytical capabilities to troubleshoot complex multi-tier application failures and performance bottlenecks.
Communication & Collaboration: Excellent written and verbal communication skills with the ability to lead technical discussions, document system specifications and engage cross‑functional stakeholders.
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 ca.hrm.tc to ensure their ability to fully participate in the interview process.
This posting is for existing and upcoming vacancies.
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