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.

BUILD lending technology
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.

Why join us

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.

Who Are You
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.

About Nesto And Nesto Cloud
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.

About The Team
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.

What You’ll Be Doing

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.

Who We Are Looking For

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).

Nice to Have

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…