Top Full Stack Developer Jobs in Toronto

Design, build, and maintain full-stack web applications for insurance pricing using Python backends (Flask/FastAPI) and React/TypeScript frontends. Translate product requirements into scalable, tested production features, improve observability and reliability, perform code reviews, and participate in agile processes. Implement pricing algorithms, data visualizations, and CI/CD pipelines while refining systems to meet SLOs.

The Senior Full Stack Engineer will design and scale KEV's SaaS platform, contributing to both frontend and backend development while ensuring system reliability and security for financial transactions.

Lead front-end architecture and implement React/TypeScript UIs for CPQ and revenue lifecycle features. Integrate front-ends with Salesforce (Apex/Lightning) and collaborate with Node.js/Java backend teams to design APIs, ensure performance, test coverage, and monitor production. Mentor engineers and shape UI libraries, accessibility, and UX for quote-to-cash workflows.

The Full Stack Engineer will develop both frontend and backend solutions to empower business users in data analysis without technical skills, utilizing various technologies including NextJS and Python.

Seeking a Full-Stack Engineer with 3+ years of experience to develop and enhance data collaboration tools using LLMs, focusing on frontend and backend development.

The Staff Full Stack Engineer will design, develop, and maintain scalable applications and APIs, lead architectural decisions, enhance advertising features using AI, and engage in technical discussions within an Agile team environment.

The Senior Full Stack Software Engineer will lead the design and implementation of AI-integrated applications, mentor team members, and engage with clients on technical scopes, emphasizing hands-on development and architectural decisions.

Build and maintain cross-platform mobile apps (primarily Flutter) and full-stack services. Design and operate serverless backend infrastructure on GCP/Firebase, model Firestore databases, implement RESTful APIs and integrations, monitor and debug production systems, support deployments, and collaborate across product, design, QA, and engineering to deliver scalable, well-tested features.

Build reusable client-side JavaScript/CSS SDKs and multi-tenant frontend architecture. Develop high-performance React/Next.js applications with Tailwind CSS, implement SSR/SSG/ISR, integrate with REST/GraphQL backends, optimize performance, and support backend data modeling, cloud deployment (AWS/GCP), CI/CD, and production monitoring.

Design, develop, test, and deploy scalable full-stack applications. Build Python backends, TypeScript frontends (Angular/React), REST APIs and microservices, integrate databases, use AWS for deployment, contribute to CI/CD, troubleshoot production issues, and follow best practices and testing processes.

Design, implement, and deploy Java/Spring Boot microservices and single-page applications for an event-driven deal management platform. Participate in coding, peer reviews, CI/CD, performance tuning (MongoDB), testing (TDD/BDD), troubleshooting, and lead agile delivery efforts with product and DevOps partners.

The Full Stack Engineer will develop and maintain scalable web applications, design system architecture, optimize performance, and collaborate with teams for code reviews in a hybrid work environment.

Build end-to-end features, design intuitive interfaces, manage asynchronous backend jobs, and contribute to open-source efforts, while leading project development from concept to monitoring.

Develop and deliver user-friendly software for B2B SaaS products. Collaborate with teams on both front-end and back-end development.

Build end-to-end user experiences for accounts, homepage, and e-commerce. Ship frontend and backend features using AI-assisted tooling, optimize performance and conversion, own releases, and collaborate on high-velocity product development.

Build end-to-end live streaming and game features across frontend and backend for a high-scale, bursty consumer product. Ship reliable, performant real-time systems using AI-assisted development, and own features from development through production and monitoring.

As a Full Stack Developer, you will design and maintain scalable applications, collaborate with teams, implement best practices, and mentor junior developers.

Design and implement full‑stack features for a cloud-native SaaS platform using React front-end and C# back-end. Build case management and shared UX, write automated tests, deploy and scale services, participate in code reviews, and collaborate with product and UX teams to deliver customer-focused solutions.

Remote short-term contract to modernize cloud-native full‑stack applications. Build scalable APIs and services, implement Terraform-based infrastructure, develop automated tests, maintain frontend (React/TypeScript) and backend (Node.js/C#), work with PostgreSQL, Docker, GitLab CI/CD, and collaborate across architecture and product teams.

Design, develop, and maintain server-side applications, APIs, and database schemas with a focus on scalability, performance, testing, and reliability. Collaborate with front-end, product, and DevOps teams, participate in architecture decisions, troubleshoot production issues, and support CI/CD and deployments.

Design, build, and iterate on fullstack systems for AI agents. Collaborate with teams to enhance UX and contribute to internal best practices while engaging in research related to AI technologies.

Design, architect, and ship full‑stack monetization and ad-creation UI features. Build scalable React/TypeScript frontends, integrate with GraphQL/REST backends, run prototypes/A-B tests, ensure automated testing and code quality, and collaborate with product, design, and backend teams.

Lead the development and implementation of application systems, mentor developers, and drive technical excellence in software solutions supporting Citi's global operations.

Lead application systems analysis and programming to enhance the Onboarding Master Central platform, mentor developers, and ensure technical excellence.

As a Senior Full-Stack Engineer, you’ll architect technology and customer experiences for web products, mentor junior staff, and develop scalable platforms and APIs while collaborating with cross-functional teams.