Senior Frontend Software Engineer, AI UX @ Pebl

Bot Jobs; Toronto; On-site; CAD 140,000 - 180,000; Full time

Benefits offered by this job

Flexible Time Off

Parental Leave

Health and Dental Insurance

Retirement Savings + Employee Incenti­

Office perks

Job summary

Pebl is seeking an experienced software engineer to design and ship full-stack features for a conversational AI assistant, with a strong emphasis on frontend/UX.

You’ll apply LLM-based design patterns, tool calls, and multi-step reasoning to shape product behavior and how it appears in UI. Expect collaboration across the stack, mentoring, and ongoing UX improvements.

Qualifications

• 8+ years of professional software engineering experience, full-stack.
• ≥1 year hands-on experience building LLM-powered or agentic products.
• Experience building AI-powered interfaces and dynamic UIs.
• Strong understanding of LLM design patterns and prompt engineering.
• Proficiency in frontend (React/TypeScript) and backend integration.
• Experience improving UX beyond CRUD workflows.

Responsibilities

• Design and build full-stack features for our conversational AI assistant, focusing on frontend/UX.
• Apply hands-on experience with LLM-based agentic systems to shape behavior and UI.
• Contribute to a strong AI-driven UX, proposing better interactions and patterns.
• Prototype new interaction patterns as models evolve.
• Lead by example, mentor juniors, and maintain high engineering standards.
• Build and maintain frontend and backend components; design clean contracts.
• Troubleshoot end-to-end including AI failure modes.

Skills

Full-stack

Frontend/UX

React

TypeScript

LLM/Agentic design

Prompt engineering

Observability

APIs/Real-time data

Backend/Infra

Tools

React

TypeScript

APIs

Job description

What Makes You a Great Fit

• 8+ years of professional software engineering experience, full-stack, with demonstrated strength and a 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 a solid understanding of how frontends integrate with backend services, APIs, and real‑time/streaming data.
• A track record of helping build products beyond standard CRUD apps and dashboards — something with real craft, polish, or a distinctive user experience.
• Comfort working across the full stack when needed (backend, infra) — this isn’t a pure frontend role.
• A lean mindset — focus 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 space that’s evolving rapidly, where the best patterns for AI‑driven UX are still being discovered — and a desire to help discover them.

This role will require in‑office collaboration Monday‑Wednesday in our Toronto, Ontario office.

How You’ll Make an Impact

• Design and build full‑stack features for our conversational AI assistant, with particular depth and ownership on the frontend/UX side.
• Apply hands‑on experience with LLM‑based and agentic systems — prompt design, tool/function calling, multi‑step agent reasoning, evaluation — to shape both how the assistant behaves and how that behavior surfaces in the UI.
• Bring product taste and a strong point of view on what makes an AI‑driven experience great — push for a better UX rather than shipping
• Push the boundaries of what conversational and generative AI interfaces can feel like — prototype and propose new interaction patterns as the underlying models and agent capabilities evolve.
• Help shape the future of how people interact with software at Pebl — you’ll be working at the edge of what’s possible in conversational and agentic UX, not maintaining what’s already been figured out.
• Build and maintain both frontend and backend components (TypeScript/React on the frontend; comfortable enough on the backend to design clean contracts and APIs that support agentic workflows).
• Lead by example in clean, maintainable code across the stack; mentor junior team members and foster a culture of constant learning and improvement.
• Contribute to technical discussions, design reviews, and code reviews to maintain high engineering standards.
• Troubleshoot issues end‑to‑end (frontend and backend) in production, including AI‑specific failure modes (e.g., bad model output, latency, dropped tool calls).

Let’s Connect If You Have

• 8+ years of professional software engineering experience, full‑stack, with demonstrated strength and a 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 a solid understanding of how frontends integrate with backend services, APIs, and real‑time/streaming data.
• A track record of helping build products beyond standard CRUD apps and dashboards — something with real craft, polish, or a distinctive user experience.
• Comfort working across the full stack when needed (backend, infra) — this isn’t a pure frontend role.
• A lean mindset — focus 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 space that’s evolving rapidly, where the best patterns for AI‑driven UX are still being discovered — and a desire to help discover them.

Our Commitment to You

At Pebl, we’re committed to supporting our team with comprehensive rewards and benefits designed to meet diverse needs across roles and locations. Our core offerings include:

• Flexible Time Off – Take the time you need to recharge.
• Parental Leave – Support for growing families.
• Health and Dental Insurance – Where applicable, to cover you and your loved ones.
• Retirement Savings + Employee Incentive Plan – Plan for the future while sharing our success.

Please visit our career page for more information https://hellopebl.com/company/careers/.