Senior Frontend Developer — Core AI Platform

Join nesto — proudly named Canadian Rocketship 2025*. A Deloitte Fast 50 company evolving alongside Canada’s top tech innovators and disrupting a 2.1 Trillion-dollar mortgage industry at light speed by building the mortgage ecosystem of the future.

with the best developers, AI engineers, and mortgage experts in the country. Work on a modern tech stack and a development framework designed to unlock your full potential and accelerate your career.

• Hypergrowth:
  Deloitte Fast 50 — 3 years in a row
• Tech community credibility:
  TechTO Canadian Rocketship 2025*
• Industry leadership: CLA Lending Company of the Year — 4 consecutive years
• Talent magnet: CMP Top Mortgage Employer 2025
• Trusted technology: powering major financial institutions across Canada
• An entrepreneurial culture built on trust, speed, uncomfortable ambition, being stronger together, and a relentless obsession with our clients.

Builders. Problem-solvers. Curious minds. People who move fast, embrace innovation, and believe we’re stronger together. If you trust your skills and want to build real technology that reshapes an entire industry, join us now.

nesto is Canada’s leading provider of mortgage technology and financing solutions, managing $73B+ CAD in residential and commercial mortgages, with 1,000+ team members across 12 offices nationwide. You will be working on Nesto Cloud, Canada’s most advanced cloud platform, delivering end-to-end technology solutions for lenders in the digital age.

Core AI is building a secure, multi-tenant platform that helps nesto teams ship AI-powered, SaaS-grade decisioning and workflows. We need a lightweight but powerful internal interface for teams to configure, observe, and operate workflows safely. You’ll build the UI that makes the platform usable: configuration views, trace/debug tools, audit trails, and operational insights, with access controls baked in.

• Build our internal portal experiences (Type Script/React) for:
  • viewing and managing configuration (flows/graphs, rulesets, prompts)
  • viewing decision/workflow traces
  • audit trails and version history
  • experimentation controls and results views
• Implement UI patterns that support platform governance:
  • approvals, promotion (dev → staging → prod), rollback flows
  • RBAC-aware screens and permission-sensitive actions
  • safe confirmation patterns for high-impact actions (publish, rollback, permission changes)
• Create polished, consistent components and workflows:
  • forms, diff views, tables, timelines, and trace viewers
  • clear empty/loading/error states for operational scenarios
• Make sensitive-data UX safe by default:
  • redaction/minimization patterns, masked fields, access-gated detail views
  • clear affordances when access is restricted by permissions
• Build for operational excellence:
  • performance optimization for large traces/tables
  • basic front-end telemetry to measure reliability and usage
• Add automated tests and collaborate on quality and performance (unit/integration/e2e where appropriate).
• Partner closely with backend and ML to ensure the UI stays aligned with platform APIs and supports real operational workflows.
• Work in an Agile delivery cadence, contributing to planning, estimation, and iterative release.

• 6–8+ years of frontend experience shipping production UI.
• Strong Type Script + React experience (Next.js a plus).
• Strong UI systems thinking: component architecture, state management, data fetching patterns.
• Strong experience integrating with and designing against APIs (REST/JSON; familiarity with auth patterns is a plus).
• Experience building complex internal tools (admin portals, observability UIs, workflow/config editors).
• Comfort working with RBAC, auditing requirements, and sensitive-data UX constraints.
• Excellent collaboration and communication skills.
• Experience working in Agile teams (iterative delivery, cross-functional collaboration).

• Experience visualizing workflow graphs, timelines, and traces.
• Familiarity with design systems and accessibility standards.
• Experience with observability tooling UX (logs/metrics/traces views).
• Experience building…