Top Full Stack Developer Jobs in Toronto

Senior full-stack engineer responsible for designing, building, and owning end-to-end features across frontend (TypeScript/React) and backend (JVM languages or Python). Mentor junior engineers, drive best practices (unit testing, CI), deploy generative AI infrastructure, work with databases and cloud/distributed systems, collaborate in cross-functional teams, and contribute to product excellence in a remote, agile environment.

Design, build, and maintain full-stack features across frontend (TypeScript/React) and backend (JVM language or Python). Mentor engineers, participate in code reviews and pair-programming, deploy generative AI infrastructure, and ensure quality via unit testing and CI in an agile, remote environment.

Develop and customize WooCommerce-based WordPress sites, integrate with the Konect360 platform, implement front-end and back-end features, optimize performance and SEO, integrate APIs and plugins, troubleshoot technical issues, and collaborate with team members during US EST business hours. Role begins part-time with potential to become full-time after probation.

The Senior Full-Stack Engineer will build end-to-end features, create APIs, write requirement documents, and learn Rust while improving product experiences for users.

Develop scalable applications and backend infrastructure for brand safety and content suitability. Design APIs, deploy ML models, and manage database systems.

The Full-Stack Engineer will develop and maintain full-stack applications, collaborate with teams, and enhance performance and reliability using React and Go.

As a Senior Fullstack Engineer, you will lead complex projects, mentor engineers, and build user-facing SaaS products using React, Node.js, and more. You'll work on various teams focusing on Third Party Risk Management, Monetization, Expansion, and Collaboration to enhance security and user experience.

Join the Platform squad to build and maintain a Typescript-based serverless microservices platform on AWS. Improve cloud availability, security, CI/CD, public APIs, data pipelines, internal DevOps libraries, and developer tooling while collaborating across product and engineering teams.

Join the Billing squad to design and build a flexible billing engine, payment/tax integrations, rating and charging infrastructure, GraphQL APIs, and user interfaces within a serverless TypeScript microservices stack. Collaborate with product, QA, and design to deliver production-grade solutions for communications service providers.

Build and maintain end-to-end web applications powering sales and operations. Design tools for quoting, scheduling, and fulfillment, integrate AI into products, collaborate on UX, ship high-impact features, and contribute to architecture, deployment, and engineering culture.

The Senior Fullstack Engineer will deliver software products, collaborate with product and business teams, lead technical practices, and ensure high-velocity iteration on a mobile advertising platform.

Lead full-stack development of scalable, high-performance front-end and back-end systems using 3D/computer-vision tech. Drive architecture, mentor engineers, own key front-end systems, and deliver features from design to launch while collaborating with internal and external partners.

Develop and maintain full-stack integrations for Grafana Cloud observability: build TypeScript/React frontends, Go backends, and Jsonnet mixins. Ship end-to-end features, own projects from design to production, contribute upstream to Prometheus/OpenTelemetry, participate in on-call rotation, and represent the team's work across the org.

Build responsive web applications and scalable frontend/backend services, design secure APIs and databases, implement AI-powered search and asset management features, collaborate on system architecture, and optimize performance and UX for a cloud-native DAM platform.

Design and build end-to-end, enterprise-grade systems that enable AI agents to initiate and complete finance workflows. Own features across backend and frontend, integrate AI/ML models into auditable production systems, ensure scale, security, and reliability, and collaborate with product and customers to solve accounting problems.

Lead design and implement end-to-end features across frontend and backend for a data analytics platform. Build React/TypeScript UIs, backend services (JVM languages/Python/GraphQL), work with Postgres, cloud and distributed systems, collaborate with Product and UX, mentor engineers, improve processes, and adopt new technologies including AI to accelerate development.

Design behavioral specs, harnesses, and validation systems so AI agents implement reliable full-stack features. Build CI gates, structural tests, linting, knowledge bases, and end-to-end verification. Diagnose failures across spec, harness, and agent layers. Architect and operate production systems across cloud and on-prem environments for regulated energy deployments, prioritizing reliability, observability, and graceful degradation.

As a Senior Full-Stack Engineer, lead development of secure AI-driven SaaS applications, focusing on backend architecture, frontend design, and AI integrations. Collaborate with teams to operationalize models and enhance application functionality through cutting-edge AI solutions.

Build and maintain core platform features, expand Infisical PKI/SSH/KMS product lines, collaborate with CTO and engineers, communicate with enterprise customers, and prototype AI applications for secrets management.

Join a small team to improve a tech product aimed at upskilling users in MENA, working with JavaScript and Node.js in a collaborative remote environment.

As an Operations Reliability Engineer, design and implement automations to eliminate manual tasks in brokerage operations, focusing on efficiency and reliability while collaborating with cross-functional teams.

As a Senior Full Stack Engineer, you'll design and develop custom Shopify applications, integrate solutions, and collaborate with clients to meet their needs.

The Senior Full Stack Developer will build features for a data security platform, focusing on microservices, code quality, and security best practices while leveraging AI tools for development efficiency.

The Senior Full Stack Engineer will develop features for HyperDX, enhancing developer experience by improving debugging and monitoring tools, collaborating with the community, and tackling technical challenges at a petabyte scale.

As the first engineering hire, you will build the core intelligence engine for factories, handling full-stack development and influencing product decisions.