Senior Full Stack Mobile Dev — React Native (Onsite, Toronto)

S.I. Systems Ltd. in Downtown Toronto is seeking a Senior Full Stack / React Native Developer to support a major aviation client project.

You will own features end-to-end across mobile and backend, using React Native, Expo, Node.js, and GraphQL. The role requires strong frontend expertise, cloud/serverless experience, DevOps skills, and the ability to work autonomously. Expected duration is 1 year with on-site work four days a week.