Top Full Stack Developer Jobs in Toronto

Build and maintain Cohere’s user-facing Dashboard across browser and server environments. Responsibilities include developing resilient, mission-critical systems, crafting intuitive product experiences, collaborating with engineers and stakeholders, removing technical roadblocks, documenting designs, and adopting technologies that improve performance and reliability.

Designs and builds full-stack API platform capabilities, including developer portals, API sandboxes, SDKs, documentation tools, API gateways, MCP servers, and secure partner integrations. Responsibilities include API lifecycle management, versioning, authentication and authorization, rate limiting, access management, and high-performance routing. The role collaborates with product, developer experience, DevSecOps, security, and technical teams to deliver scalable, developer-friendly APIs and AI-ready integrations.

Build and oversee robust full-stack applications for OTC derivatives within Markets Technology. Responsibilities include participating across the SDLC, reviewing technical solutions, shaping application-development strategies, collaborating with product, business, and support teams, managing risks and controls, and strengthening engineering culture. The role requires Java and modern web development expertise, cloud and distributed-systems experience, leadership, stakeholder management, and strong communication skills.

Design and build secure, scalable backend services, APIs, integrations, event-driven pipelines, and content-driven frontends connecting enterprise, SaaS, and AI platforms. Implement cloud infrastructure, authentication, authorization, and Infrastructure as Code while meeting security and compliance requirements. Integrate GenAI capabilities, collaborate across Product and Data teams, participate in architecture reviews, and mentor engineers through code reviews and knowledge sharing.

Build end-to-end features in a JS/TS stack, designing scalable backend services and responsive real-time frontends. Improve observability, performance, and reliability, collaborate with product/design, and own full-stack implementation from APIs and data models to UI.

The Senior Full Stack Software Developer will design, develop and implement scalable applications, manage system architecture, mentor developers, and drive engineering excellence.

Build and own user-facing features and core platform architecture across frontend, backend, and ML pipelines. Integrate AI workflows (LLMs, embeddings) for curriculum generation and automated evaluation. Manage end-to-end development: requirements, design, implementation, CI/CD, testing, observability, and iteration while collaborating with product, design, ML, and customer teams.

The Full Stack Engineer will develop features for the advertising platform, collaborate on architecture, perform code reviews, and ensure quality software development.

Build and operate full-stack product capabilities using React, TypeScript, backend services, APIs, cloud infrastructure, and data systems. Responsibilities include implementation, testing, deployment, monitoring, incident learning, and technical design. The role partners with product, design, and ML teams to turn life sciences data and AI capabilities into accessible customer experiences, while using coding AI agents and modern delivery practices.

Own full-stack product capabilities from problem framing through deployment and iteration. Build React and TypeScript user experiences, AWS Lambda computation services, scalable APIs, and backend systems across AWS, Kubernetes, Snowflake, PostgreSQL, DuckDB, and DataFusion. Lead technical design, code reviews, architecture discussions, testing, observability, and mentoring while partnering with product, design, ML engineering, and leadership on roadmap decisions.

Responsible for leading programming efforts, mentoring teammates, and developing robust, cloud-based applications using modern technologies and methodologies.

Develop and launch scalable full-stack Quora features using Python and React. Collaborate with designers, product managers, engineers, and data scientists to improve user engagement, moderation, creator experiences, and AI-powered content. Use experimentation and data to guide product iterations, contribute across the development lifecycle, and participate in on-call support for reliable service delivery.

Build Nango’s developer infrastructure platform across backend services, APIs, runtimes, dashboards, SDKs, CLI, MCP, and web applications. Own product surfaces end to end, work directly with customers, shape product and technical roadmaps, design reliable systems, and maintain open-source projects. The role requires strong backend fundamentals, TypeScript experience across Node.js and React, product ownership, developer empathy, communication, and autonomy in a remote startup environment.

Develop scalable Java applications and microservices using Spring, while applying AI-assisted development and prompt engineering throughout the SDLC. Build and maintain CI/CD pipelines, cloud deployments, containerized services, and observability solutions. Collaborate with product managers, designers, and engineers on architecture, testing, documentation, and complex problem-solving. The role also involves reviewing AI-generated code, working with front-end technologies and databases, and applying agile, TDD, or BDD practices.

Develop and own critical CRM systems in a serverless microservices environment. Build customer, property, ticketing, business operations, contract management, automation, and notification features using TypeScript across frontend, backend, and infrastructure. Collaborate with designers, developers, product managers, and QA specialists to create user-friendly interfaces and scalable cloud solutions.

Build and maintain full-stack features for a security infrastructure platform, expand PKI, PAM, and KMS products, work directly with enterprise customers, and explore AI applications in secrets management. The role requires strong JavaScript ecosystem expertise, particularly React, Node.js, and TypeScript, with optional Go and developer tools experience. This is a primarily remote role requiring work during US hours.

Build, optimize, and expand Infisical’s open source security infrastructure platform. Develop product features, work directly with enterprise customers, expand PKI, PAM, and KMS offerings, and explore AI applications in secrets management and security infrastructure. The role requires deep JavaScript ecosystem expertise, particularly React.js, Node.js, and TypeScript, with Go, DevOps, developer tools, and open source experience beneficial.

Join as the founding full-stack engineer to extend a TypeScript React/Next.js prototype, design product features, integrate AI/OCR, write tests and infrastructure, talk to users, and iterate quickly to drive growth.

Build and ship full-stack, user-facing AI and analytics features for large datasets. Responsibilities include designing high-performance experiences, rapidly prototyping and validating LLM- and agent-powered workflows, integrating agents with tools such as Slack and alerting systems, collaborating across teams, and owning scalable production solutions. The role requires strong software engineering, product judgment, cloud-native experience, observability knowledge, and practical GenAI expertise.

Lead hands-on development and operation of backend-heavy full-stack systems for billing, usage metering, rates, and marketplace workflows. Build Go services and APIs, contribute to TypeScript/React applications, manage databases and Kubernetes infrastructure, automate operational processes, investigate production issues, and execute deployments and migrations. Provide technical leadership through design, reviews, mentoring, incident response, and end-to-end project delivery.

Develop, integrate, test, deploy, and maintain complex Java applications and Azure-based microservices. Build interfaces, APIs, integrations, business logic, and database components while supporting automated testing, secure coding, CI/CD, monitoring, and production readiness. Provide technical leadership, conduct code reviews, mentor developers, troubleshoot defects and performance issues, contribute to solution design and planning, and ensure alignment with architecture and delivery standards. This is a 12-month onsite role in Toronto requiring five days per week onsite.

Build and improve full-stack web and mobile workflows for MaintainX’s maintenance platform. Ship features end to end, shape architecture and product roadmaps, own feature reliability and performance, review code, mentor developers, and improve testing and delivery practices. Work with TypeScript, React, Node.js, and MySQL while addressing large datasets, responsive interfaces, offline behavior, and multi-site scalability.

Develop and support full-stack enterprise applications, including backend services, front-end interfaces, user experiences, integrations, and scalable web services. Responsibilities include writing and reviewing code, testing, debugging, documenting solutions, maintaining data quality, supporting legacy applications, participating in Agile SDLC activities, and using AI-assisted development tools to improve productivity and code quality.

Develop and maintain full-stack coaching applications across web and mobile platforms. Build React frontends, Python and AWS-backed APIs, and support React Native iOS applications. Apply testing, automation, DevOps, security, documentation, and AI-assisted development practices. Collaborate with infrastructure and engineering teams on integrations, technical planning, sizing, and project delivery from requirements through launch.

Design, develop, test, deploy, and maintain scalable full-stack enterprise applications across front-end, back-end, Azure, and AWS platforms. Collaborate in Agile teams, build APIs and integrations, troubleshoot and optimize solutions, participate in code reviews, and apply CI/CD, TDD, and BDD practices. Mentor junior developers, improve engineering standards, document solutions, and provide effective customer support.