Senior Full-Stack Engineer — Go/React

Medasource is seeking a Full Stack Software Engineer to join its Sensors Infrastructure team and support the modernization of applications used in clinical research and wearable-device data management. This role centers on rebuilding the Study Device Portal with a React frontend and Go-based backend services, APIs, and data pipelines, while collaborating...

A leading CI/CD platform is looking for an experienced engineer to take ownership of building AI-native solutions. You will define the technical approach, build end-to-end features, and lead system design discussions. The ideal candidate has over 5 years of full-stack experience, strong capabilities in React, TypeScript, and Go, and is passionate about...

GFL Environmental Inc. in Vaughan, Canada seeks a Senior Full-Stack Developer to lead the modernization of core enterprise apps. You will deconstruct legacy .NET 4.8 MVC monoliths and re-engineer them into .NET 6+/microservices with a React frontend hosted on AWS. The role is not maintenance; it focuses on re-engineering for scalability, cloud-native design,...

Our client is seeking a contract based Senior Full Stack Engineer focused on building APIs and modern web applications using React, NestJS, and Azure cloud services. Duration: 6 months to start Location: Hybrid Markham (4d) Responsibilities:Design, develop, and maintain scalable APIs and microservices using NestJS and TypeScript. Build and enhance modern web...

ProMach is seeking a Senior Full Stack Developer to work on the Monitor & Report platform, delivering insights via .NET, APIs, data services, and a modern React UI. You’ll blend hands-on development with testing, releases, and production support across multiple layers. You’ll design backend services, support React features, and help modernize the app...

Company OverviewAt Bridgenext, we engineer Growth Operating Systems. Most enterprises have spent millions on their revenue stack and still aren't seeing the growth they expected.They have tools that function, but no system that wins. We help growth-hungry companies close that gap by turning fragmented platforms, siloed teams, and disconnected data into one...

Fitch Ratings, part of Fitch Group, is seeking a Senior Software Engineer to join our Toronto-based Ratings Technology team. You will build and maintain full-stack applications with Python and React, leveraging FastAPI/Flask on the backend and modern frontend practices. Expect to work with PostgreSQL, Oracle, and MongoDB, while deploying through CI/CD...

This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Senior Full Stack Developer (React + Node.js) based in Canada.Are you a seasoned full stack developer passionate about building scalable applications and solving complex engineering challenges? This opportunity allows you to...

Zapcom is seeking a Senior Full Stack Developer for our Toronto, ON hybrid team. The role demands strong hands-on development across the stack, with 8+ years of experience and proven project contributions. You will work with Java/Spring Boot on the backend and JavaScript/React on the frontend, building end-to-end applications, APIs, and microservices, while...