Lightspeed is looking for a Senior Frontend Developer to join our team. As a Frontend engineer, you will support Lightspeed's mission to build intelligent, AI-powered tools and capabilities that transform how our teams and customers work.
You're a frontend engineer who is excited about AI and eager to explore how LLMs and agents can reshape user experiences.
Designing and Building AI-Powered Interfaces: Design and build intuitive frontend interfaces that effectively expose AI and LLM capabilities to users and partners.
Frontend Architecture for AI Workflows: Cross-Functional Collaboration: Work closely with backend engineers, Product Managers, and Designers to integrate AI features and ship products that delight users.
Outstanding JavaScript/TypeScript knowledge with 5+ years of production experience, including expert-level React.js and modern frameworks (Next.js, etc.).
Proven technical leadership and ability to set frontend technical direction.
Strong understanding of API integration patterns, data fetching strategies, and frontend performance optimization.
Experience with modern styling approaches (CSS Modules, Tailwind, CSS-in-JS) and web components / shadow DOM.
Experience with AI-powered frontend development: agent SDKs (Vercel AI SDK, assistant-ui), Generative UI concepts, or LLM API integrations.
Experience building responsive, adaptive interfaces such as chat UIs, conversational flows, or backend-for-frontend architectures.
Experience contributing to or working with open-source frontend or AI projects.
What’s in it for you
Genuine career growth opportunities within a company that's continuously expanding
Work on high-traffic products with a global user base
and enjoy a range of benefits that’ll keep you happy and healthy:
Mental health online platform and counseling & coaching services.
Health and wellness benefits.
LinkedIn Learning license (learning is always ongoing).
We were founded in 2005, in Montreal’s gay village and our original members were all part of the LGBTQ+ community. Powering the businesses that are the backbone of the global economy, Lightspeed's one-stop commerce platform helps merchants innovate to simplify, scale, and provide exceptional customer experiences. Our cloud commerce solution transforms and unifies online and physical operations, multichannel sales, expansion to new locations, global payments, financial solutions, and connection to supplier networks.