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Senior Full stack Developer Canada Jobs

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Senior Software Developer - Full Stack
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Senior Full Stack Developer needed for a 12-month onsite contract in Toronto. You will build Java EE and Cloud-Native apps using Angular, React, Node.js, Spring Boot, and GraphQL. Key duties include developing Web Services (SOAP/ReST) and complex Oracle PL/SQL scripts. Earn a competitive daily ra...
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Canada , Toronto
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Not provided
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Randstad
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Senior Software Developer - Full Stack
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Senior Full Stack Developer sought in Toronto to architect and scale high-performance web/mobile apps using React, Next.js, and Elasticsearch. You will lead the full development lifecycle—from microservices and cloud deployment to AODA/WCAG-compliant UI/UX. Requires 5+ years React expertise, 3+ y...
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Canada , Toronto
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Randstad
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Senior Software Developer - Full Stack
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Senior Full Stack Developer needed for a 15-month onsite contract in North York. Leverage 10+ years of experience in public sector healthcare IT, including OPS methodologies and clinical system integration. You will support the m-IMMS UI, enhance system maintainability, and align with provincial ...
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Canada , North York
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Randstad
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Senior Full Stack Java Developer
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Senior Full Stack Java Developer sought in Mississauga, Canada. Leverage 5+ years of expertise in Java, React, Spring Boot, and Oracle to lead application systems analysis and programming. Design and maintain robust web applications using Microservices, REST, and GraphQL, with practical AI tool e...
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Canada , Mississauga
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94300.00 - 141500.00 USD / Year
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Citi
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Senior Full Stack Developer
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Join Citi in Mississauga as a Senior Full Stack Developer. You will build scalable microservices and React-based front-ends for a global client platform. This role requires 5-8 years of Java/Spring and ReactJS expertise. Shape the future of a large-scale, modern technology stack.
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Canada , Mississauga
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94300.00 - 141500.00 USD / Year
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Citi
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Senior Full Stack Developer
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Lead complex web application projects as a Senior Full Stack Developer at Netsweeper in Waterloo. Utilize 10+ years of experience with React, Node.js, and microservices to design scalable solutions and mentor junior developers. Enjoy a competitive package, flexible remote options, and work on cut...
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Canada , Waterloo
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100000.00 - 140000.00 CAD / Year
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EdTech Jobs
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Senior Software Developer - Full Stack
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Join our client in Toronto as a Senior Full Stack Developer for a 12-month onsite contract. Leverage your advanced skills in React.js, Python/FastAPI, and .NET Core to design and build robust applications and data pipelines. This role requires expertise in cloud architecture, CI/CD with Azure Dev...
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Canada , Toronto
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565.97 - 601.35 CAD / Hour
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Randstad
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Senior Java React Full Stack Developer
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Join Citi in Mississauga as a Senior Java React Full Stack Developer. Leverage 6+ years of experience with Java Spring Boot microservices and React.js/TypeScript frontends. Design scalable APIs and deploy on AWS/OpenShift, with a focus on innovative AI and LLM integration.
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Canada , Mississauga
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94300.00 - 141500.00 USD / Year
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Citi
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Senior Application Full Stack Developer
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Seeking a Senior Full Stack Developer in Mississauga to lead high-volume, low-latency Java applications for Capital Markets. This role requires 5+ years in Java, Angular, and Oracle RDBMS, with Weblogic EJB expertise. You will design, develop, and provide L3 support for critical inventory managem...
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Canada , Mississauga
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94300.00 - 141500.00 USD / Year
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Citi
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Senior Software Developer - Full Stack
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Join our client's team as a Senior Full Stack Developer for a 12-month contract in North York. Leverage your expertise in React, Next.js, Node.js, and TypeScript to build accessible, cloud-native web applications. This role requires strong skills in Entity Framework, REST APIs, and WCAG/AODA comp...
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Canada , North York
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Not provided
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Randstad
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Senior Software Developer - Full Stack
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Seeking a Senior Full Stack Developer for a 12-month onsite contract in Toronto. This role requires deep expertise in Java, J2EE, JSF, and open-source frameworks like Spring and jQuery. You will design data pipelines, translate specifications into applications, and resolve technical issues. Earn ...
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Canada , Toronto
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Randstad
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Senior Software Developer - Full Stack
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Lead the modernization of the legacy AERO platform as a Senior Full-Stack Developer in Milton. You will refactor systems using VB.NET, C#, and Oracle PL/SQL while implementing CI/CD with Azure DevOps. This strategic role bridges legacy code and modern practices, requiring strong technical leaders...
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Canada , Milton
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Randstad
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Senior Software Developer - Full Stack
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Join our client in Toronto as a Senior Full Stack Developer for a 12-month onsite contract. Leverage your expertise in Java EE, Spring, React, and cloud-native technologies to design and build robust applications. This role requires hands-on experience with Azure, DevOps, and Oracle databases. En...
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Canada , Toronto
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Not provided
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Randstad
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Senior Software Developer - Full Stack
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Join our client in Toronto for an 11-month contract as a Senior Full Stack Developer. Leverage your advanced Java, SpringBoot, JavaScript/TypeScript, React, and Next.js expertise to architect and build performant web/mobile applications. This role involves mentoring, leading development across th...
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Canada , Toronto
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Randstad
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Senior Full Stack .Net Developer
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Join Citi in Mississauga as a Senior Full Stack .Net Developer. Leverage 5-8 years of experience with .Net Core, Angular 10+, and REST/SOAP services. You will design, develop, and implement key applications using modern design patterns and databases. This role offers a chance to solve complex pro...
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Canada , Mississauga
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94300.00 - 141500.00 USD / Year
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Citi
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Senior Full Stack Java Developer
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Join Citi in Mississauga as a Senior Full Stack Java Developer. You will design and build web applications using Java, Spring Boot, and modern front-end technologies like ReactJS. This role requires strong expertise in microservices, RESTful APIs, and both SQL/NoSQL databases. Collaborate with a ...
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Canada , Mississauga
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94300.00 - 141500.00 USD / Year
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Citi
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Senior Full Stack Developer
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Lead the development of a global client platform as a Senior Full Stack Developer in Mississauga. Utilize your 6+ years of Java/Spring and ReactJS expertise to build scalable microservices and modern front-ends. Mentor a team and shape architecture on a large-scale, real-time technology stack.
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Canada , Mississauga
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120800.00 - 170800.00 USD / Year
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Citi
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Senior or Lead Full-Stack Developer
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Join MaintainX, a leading workflow management platform, as a Senior or Lead Full-Stack Developer in Montreal or Toronto. Leverage your expertise in TypeScript, React, Node.js, and SQL to build impactful web and mobile products. Enjoy a competitive package with equity, comprehensive benefits, and ...
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Canada , Montreal, Toronto
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Not provided
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MaintainX
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Senior Full-Stack Software Developer
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Join our Canadian startup as a Senior Full-Stack Developer. Shape our healthcare product and culture, making foundational technical decisions. We seek a product-minded owner with 4+ years' experience in Node, JavaScript, and CSS. Enjoy equity, work closely with founders, and drive projects from c...
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Canada
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140000.00 - 200000.00 CAD / Year
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Finni Health
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Senior Full Stack Java Developer
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Lead the technical direction for mission-critical web applications as a Senior Full Stack Java Developer in Mississauga. This leadership role requires deep expertise in Java, Spring Boot, microservices, and modern front-end technologies like React. You will architect robust systems, mentor a tale...
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Canada , Mississauga
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Salary
94300.00 - 141500.00 USD / Year
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Citi
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Until further notice
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About the Senior Full stack Developer role

Explore the pinnacle of software engineering careers with Senior Full Stack Developer jobs. This senior-level role represents a critical and highly sought-after position within the technology landscape, blending deep technical expertise with strategic leadership. A Senior Full Stack Developer is a versatile architect of digital solutions, proficient in both front-end and back-end technologies, responsible for building, deploying, and maintaining complex, scalable, and secure enterprise-grade applications. These professionals are the cornerstone of modern development teams, translating business requirements into robust technical realities across the entire software development lifecycle.

The core responsibility of a Senior Full Stack Developer is end-to-end ownership of application systems. This involves designing system architecture, writing high-quality, maintainable code, and integrating various software components and third-party services. They lead the development of user interfaces using frameworks like Angular or React, while simultaneously engineering powerful server-side logic, APIs, and microservices with technologies such as Java Spring Boot or Node.js. Beyond coding, they ensure application performance, quality, and responsiveness. A significant part of the role involves mentoring mid-level and junior developers, conducting code reviews, and establishing best practices for coding, testing, and security. They are key collaborators, working closely with product managers, business analysts, UX/UI designers, and infrastructure teams to align technical execution with business goals.

Typical day-to-day duties include analyzing and refining functional requirements, troubleshooting and debugging complex issues, and optimizing applications for maximum speed and scalability. They implement rigorous testing protocols, including unit and integration tests, and champion CI/CD pipelines for automated deployment. Senior Full Stack Developers are also guardians of software security, proactively addressing vulnerabilities and ensuring compliance with industry standards like OWASP. They often participate in or lead Agile ceremonies, manage technical debt, and stay abreast of emerging technologies, such as cloud-native development, containerization with Docker/Kubernetes, and generative AI tools, to drive innovation and efficiency.

The skill set for these senior roles is comprehensive. On the technical front, proficiency in both front-end (JavaScript, TypeScript, HTML/CSS) and back-end (Java, .NET, Python, etc.) languages is essential, coupled with expertise in relevant frameworks, relational and NoSQL databases, and version control systems like Git. Equally important are the leadership and soft skills: excellent problem-solving and analytical abilities, clear communication for both technical and non-technical audiences, project management, and a strong sense of ownership and risk awareness. Most positions require a bachelor's degree in computer science or a related field and a substantial track record of professional experience, typically 8-15 years, demonstrating progressive responsibility and successful project delivery. For those seeking to lead from the front lines of technology, Senior Full Stack Developer jobs offer a challenging and rewarding path to shape the digital future.

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