Top React Developer Jobs in Toronto

Senior Software Engineer responsible for developing and maintaining web applications and microservices (React, Golang). Mentor team members, lead code reviews, influence technical decisions, improve CI/CD and testing strategies (unit, E2E, performance), collaborate across teams on integrations, and promote engineering best practices and documentation.

Lead design and development of scalable, cloud-native financial and reconciliation systems on GCP. Own architecture, drive technical decisions, mentor engineers, embed AI and automation, collaborate with product and QA, and ensure reliability, performance, and test automation.

Join a cross-functional team to develop data products, write efficient code, influence AI roadmap, and collaborate with diverse professionals.

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.

Lead design and development of enterprise full‑stack applications using Python and React. Architect scalable REST APIs and microservices, work with SQL/NoSQL databases, deploy on cloud (AWS/Azure) with Docker/Kubernetes, maintain CI/CD pipelines, optimize performance, mentor developers, and collaborate with cross‑functional teams in an Agile environment.

Design, build, test, and release cross-platform React Native apps for iOS and Android. Translate Figma designs to pixel-accurate interfaces, integrate REST/GraphQL APIs, implement auth, offline storage, and push notifications. Debug native modules, manage build/release pipelines, ensure performance and security, write clean TypeScript/JavaScript, and collaborate with backend, QA, and product through code reviews and agile ceremonies.

The Senior Full-Stack Developer will work closely with the co-founders to develop telehealth features, focusing on user-friendly software that's reliable and robust. They'll participate in code testing, deployment, and feature design within a collaborative office environment.

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

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.

Design and build customer-facing banking web applications using React and Vue.js. Implement scalable front-end solutions, define API contracts with backend partners, advance test automation and CI/CD, and ensure production readiness across performance, observability, security, and usability.

Senior full‑stack developer responsible for designing, developing, and maintaining enterprise‑scale React.js frontends and Java (17+) Spring Boot microservices. Modernize Angular apps to React, build REST APIs and event‑driven pipelines with Kafka, integrate SQL and NoSQL databases, support CI/CD and containerized deployments (Docker, Kubernetes, OpenShift), and monitor production systems using ELK/Grafana.

Design, build, and maintain scalable full‑stack applications using React, TypeScript, and NestJS. Translate business requirements into architecture and design, contribute to system and API design, support CI/CD and DevOps practices, integrate AI coding tools (Claude Code) and agentic workflows, establish prompt engineering standards, and define guardrails for AI‑generated code. Work on large‑scale, production‑grade distributed systems.

Develop and maintain cross-platform mobile applications using React Native, collaborating with designers and product managers to improve user experience and performance.

Join a small engineering team to build and maintain full stack web applications and backend services using React, Python, Go, C++, PostgreSQL, and AWS. Contribute to APIs, responsive frontends, CI/CD, monitoring, debugging, and engineering best practices while collaborating on cloud-native distributed systems.

Lead frontend development for native iOS and Android apps using React Native. Turn Figma designs into high-performance screens, ship end-to-end releases to App Store and Google Play, optimize performance and startup time, design architecture and state management, own code quality and reviews, implement rich animations and gestures, integrate APIs and AI features, and maintain analytics, logging, and monitoring.

The Senior Mobile Developer will build and maintain mobile applications using React Native and GraphQL, mentor teammates, and ensure quality in software development.

The Software Developer II will design and develop full-stack features focusing on front-end development, contribute to product and technical discussions, and enhance the ShareGate platform's user experience with C# .NET and React.

Build and maintain a production React Native tablet app: design reusable components, integrate REST and real-time APIs, write unit and component tests, debug crashes via Sentry, manage releases/OTA updates, participate in code reviews, and support production incidents in a distributed team.

Lead design and development of cross-platform web and mobile UI tooling and React Native SDKs. Architect reusable components, optimize mobile performance, integrate REST/GraphQL backends, implement CI/CD and testing, mentor engineers, and collaborate with product and design to deliver high-quality cardholder experiences.

Build scalable, high-performance front-end experiences using React/Next.js and Three.js, collaborate with product and design, own systems, integrate computer vision, and deliver polished UX for customers.

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.

Lead design, implement, and maintain a scalable SaaS insurance platform across front-end and back-end. Provide technical direction, mentor developers, enforce best practices, optimize performance, ensure security and compliance, and drive adoption of modern architectures and testing methodologies.