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.

The Senior Software Engineer will develop software by writing clean, efficient code, automate tasks, and collaborate with teams to enhance products, emphasizing TDD and API development.

Lead modernization of TD's Jira/JSM platforms and build enterprise applications using Java, React, and Spring. Drive Atlassian Cloud migration, design secure integrations (OAuth/LDAP/REST), maintain ScriptRunner customizations, contribute to CI/CD pipelines, and support high-availability production systems. Provide technical leadership, mentor developers, and ensure compliance with change management and operational standards.

Develop and optimize high-performance React Native weather applications used by millions. Own features end to end, including clean coding, testing, refactoring, CI/CD deployments to the App Store and Google Play, and performance optimization. Collaborate across AWS, Go, Node.js, Docker, Kubernetes, and microservices environments while using GitHub Copilot and engineering best practices.

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.

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.

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.

Build the new ShareGate Migrate web app as a senior full-stack developer using React, TypeScript, and C#/.NET. Ship full-stack features, shape technical choices, integrate Microsoft APIs (Graph, Azure AD/Entra ID, MSAL), mentor teammates, anticipate risks, and use AI-assisted development tools to accelerate delivery and quality.

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.

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.

Develop and maintain a SaaS platform: design, build, deploy features; participate in architecture and technical decisions; ensure quality, performance and stability; perform code reviews; contribute to CI/CD and use AI tools to improve productivity and innovation.

Design, build, and maintain cross-platform mobile apps using React Native and JavaScript. Implement reusable components, integrate RESTful APIs and WebSockets, write unit and integration tests, debug and optimize performance, and collaborate with product, design, and backend teams using Git.

Design and build cross-platform mobile applications using React Native and JavaScript. Implement reusable components, integrate RESTful APIs and WebSockets, write unit and integration tests, debug issues, and collaborate with product, design, and backend teams using Git.

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.