Role Overview We are seeking a Senior Full Stack / React Native Developer to support a major application development initiative for our aviation client The ideal candidate will bring strong frontend expertise in React Native and Expo , combined with hands-on backend, cloud/serverless, and Dev

Ops experience.

This is a highly autonomous development role requiring someone who can take ownership of an assigned feature or task and drive it through the entire development and deployment lifecycle with minimal supervision .

The successful candidate will also have experience with AI-enabled software development , particularly using tools such as Cursor or Claude Code to accelerate and enhance development.

Location: Downtown Toronto Work Mode: Onsite 4 days per week Duration: 1-year contract, starting in October Key Responsibilities Design, develop, test, and deploy high-quality mobile applications for iOS and Android using React Native and Expo.

Take end-to-end ownership of assigned features, from requirements and solution design through development, testing, deployment, and production support.

Develop scalable frontend solutions using React Native, Expo, React, and Type

Script .

Build and integrate backend services using Node.js, GraphQL, and cloud/serverless technologies .

Develop and consume GraphQL APIs using Apollo Client and GraphQL Codegen .

Manage application state using Jotai, Apollo Client caching, and cache persistence .

Work within established enterprise design systems to deliver consistent, responsive, and accessible user experiences.

Support bilingual application functionality using i18next for English and French .

Leverage Firebase Analytics, Crashlytics, Performance Monitoring, and Remote Config for application monitoring and optimization.

Design, build, and maintain Dev

Ops and CI/CD pipelines .

Support multiple application environments from local development through production.

Develop automated tests and maintain code quality using Jest, ESLint, and Husky .





Use AI-enabled development tools such as Cursor and/or Claude Code as part of the software development lifecycle.

Troubleshoot complex application issues across frontend, backend, API, cloud, and deployment layers.

Collaborate effectively with developers, designers, architects, product teams, and other technical stakeholders.

Must-Have Skills Strong hands-on React Native development experience, ideally with Expo and Expo Router .

Advanced React and Type

Script development experience.

Solid experience developing mobile applications for both iOS and Android .

Hands-on backend development experience using Node.js .

Strong experience with GraphQL and Apollo Client .

Experience with AWS and serverless/cloud-native application development .

Hands-on experience creating and maintaining CI/CD pipelines .

Experience using AI-assisted development tools , preferably Cursor and/or Claude Code .

Experience with application state management and caching solutions.

Strong understanding of the complete software development and deployment lifecycle.

Technical Environment Core Technologies React Native / Expo Expo Router React 19 Type

Script Node.js 24 Yarn 4 Data & State Management GraphQL Apollo Client GraphQL Codegen Jotai Apollo cache persistence UI & Internationalization Enterprise/in-house design system i18next – English/French Dev

Ops, Testing & Monitoring AWS / Serverless Firebase Analytics Firebase Crashlytics Firebase Performance Monitoring Firebase Remote Config Jest ESLint Husky CI/CD pipeline development Ideal Candidate The ideal candidate is a senior, hands-on developer rather than someone who requires significant technical direction .

They should be comfortable owning a feature independently, making sound technical decisions, collaborating with the broader team when required, and taking their work all the way through development, testing, deployment, and production.

Strong React Native/Expo expertise, full-stack capability, AWS/serverless experience, Dev

Ops knowledge, and modern AI-enabled development experience will be critical to success in this role.

📌 Senior Full Stack / React Native Developer to support a major application development initiative for our aviation client (Toronto)
🏢 S.i. Systems
📍 Toronto