Job Title: Senior Frontend Engineer

Company Name: JIG-SAW US, Inc.

Job Url: https://www.simplyhired.com/job/pjHbnbYdtA6b4uEsnnT3CagN_A3ZC8PmNqICp5I5OyFvwRbTkeogSw

Job Description: Senior Frontend Engineer (Next.js / TypeScript), AI/ML-powered IoT Platform
JIG-SAW US, Inc.
Remote

Job Details
Contract
$100,000 - $150,000 a year
3 hours ago
Benefits
Health insurance
Dental insurance
Paid time off
Vision insurance
Qualifications
AI models
TensorFlow
Responsive design
Dashboard development
Performance tuning
Tailwind CSS
Computer Science
Internet of Things
D3.js
5 years
Big data
UI design systems
Bachelor's degree
Machine learning
Model deployment
Next.js
GitHub
User flows
Front-end development
Model training
Data visualization
Real-time data processing implementation
Senior level
SaaS
AI
Bachelor's degree in computer science
TypeScript
Software architecture
Design systems
Mobile design
Full Job Description
Who We Are

JIG-SAW operates 24/7 Operations Centers in Japan and Canada that proactively monitor systems and deliver live incident response—keeping web services and IoT environments stable and high-performing.

Corporate site: https://jig-saw.com/en
NEQTO.ai: https://neqto.ai
About the Role

We are looking for a Senior Frontend Engineer who doesn’t just build "pages," but crafts high-performance interfaces for our multi-tenant SaaS IoT platform. You will own the frontend architecture end-to-end—building dashboards that handle high-velocity data, complex onboarding workflows, and live monitoring views.

This role requires a blend of technical optimization (making things fast) and product thinking (making things intuitive). You’ll collaborate with Backend and AI teams to bridge the gap between complex data streams and a seamless, responsive user experience.

What You’ll Do

Performance Optimization: Proactively audit and optimize UI performance (Core Web Vitals, bundle sizes, and execution time) to ensure the platform remains snappy while handling massive IoT datasets.
Responsive Architecture: Design and implement a truly responsive UI that functions flawlessly across desktop, tablet, and mobile—ensuring field engineers and executives alike have the data they need.
User Flow & UX: Own the user flow of critical features; you'll think through how a user moves from "device registration" to "alert monitoring" to minimize friction and maximize clarity.
Modern Stack Ownership: Evolve our architecture using Next.js 15 (App Router), React 18+, and TypeScript 5.
Design Systems: Scale a modern design system using (Radix UI + Tailwind CSS v4).
Real-time Data: Implement streaming updates and efficient caching strategies to display live sensor data without draining the user's browser resources.
Required Qualifications

Experience: 5+ years of professional experience with Next.js/React and TypeScript.
Modern Tooling: Deep expertise in Next.js 15 (App Router), React 18+, and Tailwind CSS v4.
Responsive Mastery: Expert-level knowledge of CSS/Tailwind for building complex, responsive layouts that don't break on edge-case screen sizes.
Optimization Mindset: Proven track record of optimizing heavy client-side applications (virtualization, memoization, and efficient data fetching).
Education: Bachelor’s degree or higher in Computer Science (or closely related field).
Nice-to-Have

User Flow Design: Experience mapping out and implementing intuitive user journeys for complex B2B or SaaS products.
Data Visualization: Experience with D3.js, Recharts, or Canvas for real-time sensor data visualization.
IoT Awareness: Experience with monitoring systems, device management, or telemetry dashboards.
Portfolio Requirement (Mandatory)

Applications without a portfolio will not be considered. Please provide links to:

GitHub or GitLab profile.
Live product sites or technical demos.
Case studies highlighting your role in optimization or UI architecture.
Candidates must also pass a third-party programming assessment as part of the screening process.

Job Type: Contract

Pay: $100,000.00 - $150,000.00 per year

Benefits:

Dental insurance
Health insurance
Paid time off
Vision insurance
Application Question(s):

Tell us about your experience optimizing heavy client-side applications (virtualization, memoization, bundle optimization).
Can you provide a portfolio with GitHub/GitLab profile and live product sites or demos?
Education:

Bachelor's (Required)
Experience:

TypeScript: 5 years (Required)
Next.js/React : 5 years (Required)
Tailwind CSS: 5 years (Required)
Shift availability:

Day Shift (Preferred)
Night Shift (Preferred)
Work Location: Remote