Top Full Stack Developer Jobs in Toronto

Lead the design, architecture, and development of scalable, low-latency full-stack applications for Citi’s global client onboarding platform. Build Java microservices, REST APIs, and ReactJS interfaces; establish coding, testing, and architectural standards; conduct proofs of concept; ensure performance, reliability, and scalability; mentor developers; collaborate with technical and business stakeholders; and provide post-release support.

Lead the design, architecture, and development of scalable Java full-stack applications for Citi’s global client onboarding platform. Build real-time microservices, RESTful APIs, reusable components, and high-performance systems using Java and ReactJS. Mentor developers, conduct code reviews, guide architectural decisions, support proofs of concept, and ensure reliability through testing, continuous integration, and post-release support.

Develop scalable Java Spring Boot APIs, microservices, React-based interfaces, ETL pipelines, and SQL data solutions. Deploy workloads on AWS, optimize performance, implement monitoring and automation, and collaborate with product, frontend, data, and DevOps teams. The role also contributes to architecture, accessibility, reliability, and data-driven product improvements.

Develop and deliver maintainable, testable, and performant web applications for consumer and enterprise clients. Responsibilities include software development, code reviews, extensive testing, researching and sharing new technologies, collaborating with teammates, and improving development workflows. The role requires strong full-stack JavaScript expertise and understanding of modern web application architecture, APIs, data storage, security, optimization, and cloud technologies.

Develop and maintain performant, testable web applications for consumer and enterprise clients. Responsibilities include software development and architecture, code reviews, extensive testing, researching technologies, and collaborating with a skilled development team. The role requires strong programming ability, modern web application knowledge, database experience, and familiarity with frontend frameworks or backend platforms.

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 design and implementation of scalable, secure solution architectures and high-level designs. Create ADRs/HLDs, participate in governance, evaluate technologies, collaborate with stakeholders, mentor teams, and ensure compliance with architectural and security standards.

Own full-stack product features from technical scoping through deployment and post-launch iteration. Design schemas, APIs, and business logic; build user-facing applications across frontend, backend, and databases; collaborate with ML researchers, product, design, and engineering; incorporate user feedback; and improve development, testing, and deployment practices.

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.

Senior Full Stack Software Engineer responsible for building and owning scalable cybersecurity product experiences across front-end and back-end systems. The role uses TypeScript, Golang, React, Node.js, Kubernetes, cloud platforms, databases, APIs, and CI/CD pipelines. Responsibilities include architecture, performance optimization, security, mentoring engineers, leading projects, Agile planning, and adopting AI-assisted development tools.

Leads architecture and development of enterprise CRM and financial applications for global institutional clients. Designs microservices using Java and Spring, migrates monoliths to scalable cloud architectures, automates zero-downtime deployments, and owns application stability and engineering roadmaps. Serves as a technical liaison across business, technology, and vendor teams while mentoring 20 or more engineers and ensuring regulatory, risk, and client-asset protections.

Lead backend architecture and development across the full SDLC for Capital One's travel platform. Own technical design, build fault-tolerant systems, improve developer experience, establish engineering best practices, and mentor junior engineers while collaborating with cross-functional stakeholders.

Design, develop, test, maintain, and support scalable Java full-stack applications for TD’s prime brokerage platform. Translate business requirements into secure technical solutions, build REST APIs and microservices, develop React front ends, and manage database integrations. Participate in code reviews, production support, incident resolution, root-cause analysis, deployment, performance tuning, and continuous improvement. Collaborate with business, QA, infrastructure, and application support teams while managing technical risks, dependencies, and delivery requirements.

Build and maintain an internal computer vision annotation platform, including interactive workflows, dashboards, data pipelines, and quality measurement tools. Develop customer-facing ML services for PII blurring and model-assisted labeling. Deploy and optimize detection and segmentation models using PyTorch, TensorRT, and ONNX, and expose them through high-performance concurrent APIs. The role requires strong frontend engineering, production Python, applied ML deployment, video processing, and human-in-the-loop workflow expertise.

Build and operate full-stack features across TypeScript, Node.js, React, and Rust services. Own development from design through production, including APIs, webhooks, integrations, testing, CI automation, code review, refactoring, troubleshooting, and on-call support. Improve agentic development workflows and quality practices, expand automated coverage, and collaborate with distributed product and engineering teams in an Agile/Scrum environment.

Develop and support full-stack applications for OTC derivatives and Markets Technology. Responsibilities include feasibility analysis, system design, coding, testing, implementation, user support, security improvements, risk assessment, and advising junior analysts. The role requires Java-based REST API development, JavaScript or React proficiency, TDD, clean code, algorithms, SQL, and independent work in a fast-paced financial technology environment.

Build and scale full-stack Hiring Assistant features using React and Ruby on Rails. Develop AI-driven hiring workflows for candidate discovery, screening, matching, and onboarding; integrate LLMs, agents, and automation tools; and contribute to architecture, APIs, distributed systems, performance, testing, and scalability. Collaborate with Product, Design, and Data while improving engineering velocity and code quality in a high-ownership hybrid environment.

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 Texas Instruments’ Embedded Processing Software Engineering Tools team in Toronto through a first-year Career Accelerator Program. Develop desktop and cloud-based embedded tooling, contribute to complex application software, learn software development life cycles, and work with embedded devices, SDKs, and industry-standard tools. The role requires collaboration, problem-solving, communication, and programming experience with TypeScript, JavaScript, React, HTML, and CSS.

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.

Build and maintain performant, scalable full-stack SaaS systems using front-end and back-end technologies. Develop reliable features, write unit and integration tests, monitor performance, debug issues, review logs, and contribute to architectural decisions. Own features from technical design through deployment and post-release support while documenting solutions and collaborating with engineering, UX, and product teams.

Build AI-augmented, full-stack applications from concepts and prototypes through production, with emphasis on frontend excellence. Create accessible, responsive React, Vue, and Nuxt interfaces; develop APIs and backend services; manage SQL and NoSQL databases; implement authentication, caching, performance, and scalability strategies. Use AI design tools, Figma, design systems, and specification-driven workflows while collaborating with designers and innovation teams.

Build and operate scalable, low-latency APIs, event-driven services, integrations, and web applications supporting membership and loyalty experiences. Integrate and extend Antavo with commerce, CRM, CDP, marketing, and data platforms. Apply distributed-systems, reliability, observability, and security practices; troubleshoot production issues; contribute to reusable engineering assets; and mentor junior engineers.