Top Full Stack Developer Jobs in Toronto

Design and develop Large Language Model-based applications within Pharma R&D, focusing on client collaboration and technical excellence while ensuring production readiness and performance optimization.

Develop and maintain cloud-based IoT applications for manufacturing. Design secure, scalable full-stack solutions, APIs, data integrations and pipelines. Collaborate with architects, product owners, developers, and stakeholders; follow DevOps and agile practices; mentor team members and troubleshoot production issues.

Develop full-stack features for an internal onboarding tool across frontend, backend, databases, infrastructure, testing, deployment, monitoring, and cybersecurity. Collaborate throughout the software development lifecycle, participate in Agile ceremonies, conduct design and code reviews, document technical work, and collaborate with Product and Analyst stakeholders. The role includes learning AWS cloud infrastructure and contributing to requirements definition, system architecture, and continuous improvement.

Work on a collaborative engineering team throughout the software development life cycle. Responsibilities include developing features, participating in design and code reviews, writing unit, component, and integration tests, building AWS infrastructure, supporting CI/CD, documenting technical work, monitoring applications, addressing vulnerabilities, and collaborating with Product and Analyst stakeholders in an Agile environment.

Build and maintain full-stack web applications using Vue.js/Nuxt 3, TypeScript, Node.js, and AWS. Implement SSR, reusable components, Node APIs and integrations with headless CMS and third-party platforms. Contribute to AI-enabled marketing workflows, performance, accessibility, SEO, testing, monitoring, and troubleshoot across browsers, APIs, CMS, and cloud infrastructure. Participate in code reviews, documentation, and cross-functional planning.

Join the Cloud Data Ingestion & Transformation team to design, build, and operate scalable data ingestion and transformation systems. Own end-to-end features (primarily back-end with front-end delivery), process very high data volumes, drive architectural decisions, and improve platform reliability and customer data integrations.

Build and maintain the TypeScript-based Duo Client SDK, including Node.js core packages, public APIs, browser-compatible modules, Vue 3 client components, and platform adapters. Responsibilities include migrating consumers from the GitLab Language Server, managing versioning and deprecation paths, strengthening credential security, optimizing browser performance, writing tests, conducting code reviews, and participating in on-call support.

Lead development of core client systems and engine-level infrastructure in Unity/C#. Diagnose and fix cross-cutting performance issues, upgrade third-party SDKs, evolve build tooling, produce design docs, scope multi-week infrastructure initiatives, mentor engineers, and drive profiling, optimization, and architecture changes to enable future features.

Lead design and review of scalable, secure solution architectures and HLDs. Drive architectural governance, create ADRs, collaborate with stakeholders, mentor teams, and align technical capabilities with business objectives in a cloud-first environment.

You will lead engineers to meet quarterly goals, support product development, solve complex issues, and foster talent development in your team.

Deliver and maintain scalable, reliable full-stack solutions across front-end WYSIWYG designer experiences and back-end rendering systems. Write well-tested, reusable code, refactor to reduce technical debt, build tooling and processes, conduct empathetic code reviews, collaborate with stakeholders, mentor teammates, and drive projects from design through rollout.

Lead full-stack design and development for Capital One's travel platform, owning architecture, implementing front-end and back-end features, improving engineering tools and practices, mentoring junior engineers, and integrating with partners like Brex while leveraging cloud services and databases.

Lead design and delivery of scalable, secure solution architectures for Capital One's travel portal. Create ADRs and HLDs, participate in governance, maintain capability catalogs, evaluate new technologies, collaborate with stakeholders, mentor teams, and ensure solutions meet architectural and security standards in a regulated environment.

Lead full-stack design and development for Capital One's travel portal across front-end and back-end. Own architecture, apply HLD methodology, establish engineering best practices, mentor junior engineers, and improve developer experience while working through the SDLC on fault-tolerant, multi-platform systems.

Build end-to-end full-stack AI features on a Ruby on Rails backend and React frontend, including LLM inference infrastructure, RAG, AI agents, and evaluation/observability. Design and run experiments (A/B tests), optimize systems for production performance and reliability, and iterate rapidly with product and design partners.

Build and evolve Circle Discover marketplace features: high-converting purchasing flows, algorithmic recommendations, content feeds, and listings. Work across a Ruby on Rails backend and React/Next.js front-ends, optimize performance and SSR/SSG, collaborate with designers and leaders, and improve codebase quality while shipping at pace in a distributed remote team.

Lead design and delivery of scalable, secure solution architectures across cloud-based systems. Create ADRs and HLDs, participate in governance, collaborate with stakeholders, mentor teams, and ensure alignment with architectural and security standards.

Contribute to design, development, testing and maintenance of web applications using AngularJS, Spring Boot and SQL. Collaborate with product, design and engineering teams, conduct code reviews, troubleshoot and debug, identify security vulnerabilities, mentor junior analysts, and drive process improvements to deliver scalable, maintainable backend and full-stack solutions.

Build and maintain React front-end interfaces and accompanying API routes for an AI security platform. Visualize large-scale usage, cost, and forecasting data with a focus on performance and accessibility. Debug full-stack production issues, write cloud deployment and monitoring automation, participate in customer feedback and prototyping, and continuously ship, test, and improve product with peers.

Design, build, test, deploy and support client-facing features across an Angular front end and C#/.NET back end. Own APIs, data contracts, observability, and production reliability. Collaborate with product, design, QA, and data teams to deliver performant, accessible, and secure financial product experiences that drive customer adoption and business outcomes.

Contribute to design, development, testing, and implementation of enterprise applications. Build and integrate web applications (Java, Angular/React), implement REST/Kafka integrations, optimize performance and reliability, apply security best practices, support users, coach junior analysts, and assist cloud migration efforts.

The Full Stack Engineer will design, build, and maintain scalable web applications, impact customer onboarding and integrations, write and review code, and support technical improvements.

The Senior Full Stack Engineer will design and build core infrastructure for a logistics platform, focusing on backend systems, high-scale CRUD APIs, and real-time, event-driven architectures in a startup environment.

Provide Java full‑stack development and application support (including on‑call rotation) for credit systems. Troubleshoot, fix, and enhance applications; write and maintain quality code; perform unit/integration testing; collaborate with analysts and stakeholders; participate in incident management, root cause analysis, and continuous improvement while adhering to security and delivery standards.

Leads the design, development, and implementation of complex full-stack applications using Java, Spring Boot, Node.js, React, and microservices. Architects scalable solutions, integrates Oracle and MongoDB, optimizes performance, and applies test-driven development and automated testing. Collaborates with cross-functional teams, conducts code reviews, mentors developers, manages complex development tasks, and promotes engineering quality, security, DevOps, and continuous improvement.