Senior Full-stack Application Developer

Our partner is looking for a Senior Fullstack Developer based in Canada. This role is a front-end-leaning full-stack engineering position focused on building high-performance, scalable digital applications. You’ll work end-to-end across modern user interfaces, APIs, services, and data layers, with a strong emphasis on React, Next. js, and TypeScript. Reporting to the Technical Director, you’ll contribute to architecture and technical direction while remaining hands-on in development. It’s well suited to a technically strong engineer who enjoys solving challenging problems in a fast-paced, client-facing digital agency environment. Accountabilities - Lead the architecture, design, and development of complex full-stack applications using React, Next. js, TypeScript, and supporting Node. js APIs and services. - Design and develop RESTful and/or GraphQL APIs, including data models, authentication, integrations, and connections to SQL or NoSQL databases. - Translate business requirements, client needs, and UI/UX designs into scalable, responsive, accessible, and high-performing full-stack solutions. - Collaborate closely with clients, product managers, UI/UX designers, and engineering teams throughout the development lifecycle. - Serve as a technical expert across the front-end and back-end stack, providing guidance and best-practice recommendations to junior and mid-level engineers. - Drive adoption of modern development techniques, tools, frameworks, and engineering practices across the technology stack. - Ensure applications meet high standards for performance, scalability, security, maintainability, and reliability from the UI through the API and data layers. - js server-side capabilities, including SSR, React Server Components, and API routes, where they improve application performance or developer experience. - Participate in code reviews across the stack, promoting quality, consistency, maintainability, and adherence to established standards. - Troubleshoot and resolve complex technical issues spanning front-end, API, and data layers. - Communicate technical concepts, solutions, and project progress clearly to both technical and non-technical stakeholders, including clients. - Stay current with emerging front-end and back-end technologies and evaluate new approaches that could improve project outcomes. - Contribute to project planning, technical estimation, documentation, and broader technical decision-making. Requirements - Bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience. - 5+ years of professional experience as a Front-End or Full-Stack Engineer, with strong expertise in React, Next. js, and TypeScript. - 2+ years of hands-on backend development experience using Node. js frameworks such as Express or Nest. js and working with relational or NoSQL databases such as PostgreSQL or MongoDB. - At least 3 years of experience working within a digital agency environment, including direct client interaction and relationship management. - Proven ability to build responsive, accessible, performant web applications supported by well-designed APIs and data models. - Deep understanding of modern JavaScript across both client-side and server-side development. - Practical experience with SSR, React Server Components, and static site generation as approaches for connecting front-end and back-end functionality.