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Pebl is a global employment platform that uses AI to help companies hire, pay, and manage employees across 185+ countries. The company is building Alfie, a conversational AI assistant, and seeking a Senior Frontend Software Engineer to lead the design and development of user-facing AI experiences.
In this role, you will own the frontend/UX side of full-stack feature development for a conversational AI assistant. You'll apply hands-on experience with LLM-based and agentic systems—including prompt design, tool/function calling, multi-step agent reasoning, and evaluation—to shape both how the assistant behaves and how that behavior surfaces in the UI. You'll bring product taste and a strong point of view on what makes an AI-driven experience great, pushing for better UX rather than shipping "good enough."
Key responsibilities include:
- Design and build full-stack features with particular depth and ownership on the frontend/UX side
- Apply hands-on LLM and agentic systems experience to shape assistant behavior and UI presentation
- Push boundaries of conversational and generative AI interfaces; prototype and propose new interaction patterns
- Build and maintain both frontend (TypeScript/React) and backend components; design clean contracts and APIs supporting agentic workflows
- Lead by example in clean, maintainable code; mentor junior team members
- Contribute to technical discussions, design reviews, and code reviews
- Troubleshoot end-to-end issues in production, including AI-specific failure modes (bad model output, latency, dropped tool calls)
This is not a backend AI infrastructure, RAG platform, internal automation, or AI-assisted developer tooling role. The core need is someone who can drive the user-facing AI experience. You'll work at the edge of what's possible in conversational and agentic UX, not maintaining what's already been figured out.
The role requires in-office collaboration Monday–Wednesday in the Toronto office.
REQUIREMENTS:
- 8+ years of professional software engineering experience, full-stack, with demonstrated strength and clear preference for frontend/UX work
- 1+ years of hands-on experience building LLM-powered or agentic products (not just calling an API, but designing how an agent reasons, uses tools, and hands control back to the user)
- Experience building interfaces for AI-powered or agentic products (conversational UIs, copilots, assistants), including exposure to generative/dynamic UI techniques where the interface adapts to model behavior
- Solid understanding of LLM design patterns, prompt engineering, and observability/instrumentation for agentic systems
- Strong command of modern frontend (React/TypeScript) paired with solid understanding of how frontends integrate with backend services, APIs, and real-time/streaming data
- Track record of helping build products beyond standard CRUD apps and dashboards—something with real craft, polish, or distinctive user experience
- Comfort working across the full stack when needed (backend, infra)
- Lean mindset focused on delivering customer value by minimizing waste, optimizing workflows, fostering continuous improvement, and prioritizing quick iteration with quick feedback cycles
- Excitement for working in a rapidly evolving space where the best patterns for AI-driven UX are still being discovered
