Top React Developer Jobs in Toronto

Develop end-to-end cloud-native applications across frontend, backend, APIs, AI, and data layers. Build React interfaces, Python and Java services, LLM and agentic AI solutions, RAG systems, data pipelines, and Azure-based infrastructure. Responsibilities include testing, deployment automation, security, observability, troubleshooting, architecture, and cross-functional collaboration.

Build and release secure, high-performance mobile applications for digital asset users across iOS and Android. Own features from design through post-launch monitoring, integrate RESTful APIs, manage offline state and caching, implement comprehensive testing, and debug complex issues. The role requires deep experience with React Native, iOS, or Android development and collaboration in a fast-paced, onsite Toronto environment.

Build and operate customer-facing SaaS applications using Java, Spring, React, and TypeScript. Own complex features from design through production support, develop APIs and distributed systems, improve frontend experiences, apply AI-assisted coding tools, modernize legacy software, strengthen CI/CD and observability, and mentor engineers through technical leadership and code reviews.

Build and own React Native features for Kraken’s consumer mobile app, from product discovery through launch, measurement, and iteration. Partner with Product and Design to create responsive, trustworthy financial experiences using dynamic or real-time data. Guide development for a new Asian-market app, including regional UX, connectivity restrictions, vendors, and telemetry. Contribute to architecture, performance, reliability, code reviews, and product engineering standards.

Leads the design, development, maintenance, and technical direction of a scalable insurance SaaS platform. Works across .NET back-end and Vue/React front-end technologies, optimizes performance, enforces coding and security standards, leads code reviews, resolves bugs, and mentors developers. Collaborates with product, design, and engineering teams on architecture, requirements, testing, cloud infrastructure, microservices, and continuous platform improvement.

Leads delivery of complex React Native screens and integrations across multiple waves. Establishes engineering patterns, reference implementations, code standards, and architecture decisions; reviews pull requests and mentors client engineers. Owns payment, Auth0 identity, push notification, deep-linking, and native platform integrations. Supports hypercare self-sufficiency exercises and must have production experience with React Native New Architecture, mobile replatforming, secure token storage, and iOS and Android development.

Develop and optimize high-performance React Native weather applications used by millions. Own features end to end, including clean coding, testing, CI/CD deployment to the App Store and Google Play, performance optimization, refactoring, and collaboration across AWS, Go, Node.js, Docker, Kubernetes, and microservices environments.

Develop scalable Java Spring Boot APIs, microservices, React-based interfaces, ETL pipelines, and SQL data solutions. Deploy workloads on AWS, optimize performance, implement monitoring and automation, and collaborate with product, frontend, data, and DevOps teams. The role also contributes to architecture, accessibility, reliability, and data-driven product improvements.

Build and scale consumer-facing frontend experiences for patient sign-up, care flows, and account management across web and mobile platforms. Own frontend architecture and feature development from concept through production, ensure cross-browser and device compatibility, write clean and well-tested React code, and collaborate on feature design, architecture, and delivery in an on-site product and engineering environment.

Design and deliver scalable full-stack applications using Java, Spring Boot, Angular, React, and Next.js. Build secure REST APIs, responsive accessible interfaces, and maintainable tested code. Collaborate with product, design, platform, and engineering teams on end-to-end features. Contribute to architecture, code reviews, CI/CD, cloud-native deployment, automated testing, and continuous process improvement while owning delivery risks and technical trade-offs.

As a React Engineer, you will build responsive user interfaces and collaborate with cross-functional teams to enhance the user experience through performance optimization, integration with APIs, and adhering to accessibility standards.

Develop and maintain mobile applications using React Native, collaborate with cross-functional teams, and optimize applications for performance and user experience.

As a React Engineer, you'll build responsive user interfaces for web applications, optimizing performance and integrating with APIs while ensuring accessibility and SEO best practices.

The Java Full Stack Developer will develop backend services, design Microservices, and build responsive UIs with React.js, ensuring integration and performance optimization.

Lead the development of cloud-native enterprise applications using React and AWS, mentor team members, collaborate with stakeholders, and optimize solutions.

The React Full Stack Developer will design, develop and maintain web applications, leveraging expertise in Java and JavaScript frameworks, specifically React, along with deep knowledge of cloud-native application development and microservices architectures.

Design, implement, and maintain backend services and web applications on a Microsoft stack; build front-end features with React; write well-tested, secure code; collaborate with product and design; participate in code reviews and improve CI/CD/DevSecOps pipelines.

The role involves designing and developing front-end and back-end components, mentoring team members, ensuring system efficiency, and optimizing platform performance in a collaborative team environment.

The Senior Full Stack Developer will build features for a data security platform, focusing on microservices, code quality, and security best practices while leveraging AI tools for development efficiency.

Lead design, development, and maintenance of high-performance React Native mobile apps for iOS and Android. Build shared UI components, collaborate with backend/product/design teams, mentor engineers, optimize performance, and research new technologies to deliver scalable, production-grade mobile experiences.

The Mobile Developer (React Native) will build high-quality cross-platform mobile applications, participate in testing, and collaborate with the development team.

Lead development of cross-platform mobile applications using React Native, integrating APIs and hardware. Collaborate with teams and optimize performance across platforms.

Design and implement frontend applications using JS, CSS, React, and Flutter. Collaborate on technical specs and contribute to documentation, ensuring user experience and performance.

Design and build scalable mobile applications using React and React Native. Collaborate with teams to deliver high-performance applications.

Design and develop scalable applications in an Agile team, collaborating closely on features while learning and applying new technologies.