Our client is looking for a Senior Front-End Developer to build and maintain the accessible, responsive, user-facing side of a large enterprise platform. You'll turn approved research, wireframes, prototypes, design specs, and user stories into reusable, maintainable components that give users a consistent experience across platform features and onboarded services. You'll work alongside UX, product, business analysis, architecture, backend, QA, accessibility, security, and DevOps teams. You'll also champion secure coding, accessibility, performance, and testing standards, and support releases and production stability so businesses get a reliable digital experience.

Turn approved technical specifications into working, tested, accessible, and maintainable front-end applications.

Write detailed programming specifications, and design, code, debug, document, and maintain front-end code.

Connect front-end components to RESTful APIs, identity and access services, security gateways, workflows, notifications, documents, and other platform services.

Create and run unit, component, integration, accessibility, and end-to-end tests.

Take part in design walkthroughs, code reviews, backlog refinement, estimation, and sprint and release planning.

Work closely with business analysts, UX designers, architects, backend developers, testers, and DevOps engineers across the SDLC.

Review and update configuration, build, and installation scripts for testing, deployment, conversion, and migration.

Investigate and resolve complex technical issues during development, implementation,



migration, and day-to-day operations.

Provide post-go-live support for production, performance, usability, accessibility, security, and integration issues.

Produce user, system, technical, deployment, and support documentation as needed.

Deliver on commitments while adapting to shifting priorities and tight timelines.

Extensive experience designing and building large-scale, multi-client, internet-ready web applications.

A proven ability to turn specifications, wireframes, prototypes, user stories, and acceptance criteria into working, tested applications.

Experience integrating UIs with RESTful APIs and web services, identity services, security gateways, middleware, and backend components.

Working knowledge of relational or hierarchical databases and query languages for retrieving and presenting data.

Experience with communication protocols and security approaches such as OAuth 2.0, JSON Web Tokens, and SSL certificates.

Experience applying structured and Agile methodologies across the full SDLC, including design, coding, unit testing, deployment, conversion, migration, and implementation.

Experience with Azure DevOps or similar tools for source control, work management, CI, and deployment.

Hands‑on experience building accessible experiences in line with AODA and WCAG standards.

Experience gathering and documenting technical information from stakeholders, SMEs, architects, designers, and other IT professionals.

Experience with front-end performance monitoring tools.

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📌 Software engineer senior H/F (IT) (Toronto)
🏢 Querentia
📍 Toronto