Next.js Migration Engineer (React ? Next.js)

Contract (3–6 months) with option to extend • Full-time (remote)
Start Date: ASAP

About Us
OneTree Marketing is a Toronto-based global funnel-building agency. We create high-converting, AI-driven web experiences for medical, beauty, and home-service brands across North America and Asia. Our current sites are prototyped in Lovable AI (exported as standard React). We’re ready to scale by migrating these sites to Next.js so we can leverage server-side rendering, incremental static regeneration, and multi-language SEO at enterprise grade.

What You’ll Do
Audit & plan the migration path from Lovable AI React exports to a modern Next.js (v14) codebase using the App Router.

Refactor existing components into server and client components, ensuring SSR/SSG strategies align with performance and SEO goals.

Implement internationalization (i18n) and structured-data best practices to support English/Korean/Chinese content.

Optimize performance (Core Web Vitals, image optimization, edge-cache strategy).

Integrate headless CMS or MDX content workflow (we currently evaluate Sanity/Contentlayer).

Build API Routes (Node/Express-style) for lead-capture forms and Stripe payments.

Set up CI/CD (GitHub Actions / Vercel) with automated preview deploys.

Write unit & integration tests (Jest, React Testing Library) and ensure 90 % coverage on critical paths.

Collaborate directly with our CTO (AI) and SEO lead to ensure clean, scalable code.

Document the migration playbook so future projects follow a repeatable pattern.

Must-Have Skills
Core Tech Details
Next.js 13/14 App Router, server-side data fetching, ISR
React (18+) & TypeScript Hooks, Context, component composition
Tailwind CSS Utility-first workflow, PostCSS config
SEO & Accessibility Schema.org markup, WCAG 2.1, Core Web Vitals
Git & CI/CD Branch workflows, GitHub Actions (or similar)
Testing Jest, React Testing Library, basic E2E (Playwright/Cypress)
REST/GraphQL APIs Consumption & light authoring in Next.js API Routes

Nice-to-Have
Experience with Lovable AI or other AI site builders (Framer, Webflow)

Internationalization frameworks (next-i18next / next-intl)

Familiarity with Edge Functions (Vercel / Cloudflare Workers)

Stripe or other payment integrations

Understanding of Google Tag Manager & advanced analytics setups

Basic knowledge of medical industry compliance (PHIPA/HIPAA)

What We Offer
Competitive hourly or project-based rate (let’s talk)

100 % remote flexibility with core hours overlap (9 AM–1 PM EST)

Direct impact on global, high-traffic sites (doctors, clinics, e-commerce)

Small, fast-moving team that iterates quickly and values clean code

Option for long-term collaboration on multiple funnels and SaaS products (OneTree AI)




We can’t wait to see how you’ll help us turn Lovable AI prototypes into high-performing Next.js experiences!