Senior Full-Stack Architect: High-Performance SaaS Infrastructure Migration (Figma Ready)

Project Overview:
We are migrating an established SaaS platform from an outdated, legacy WordPress build to a high-performance, custom-engineered infrastructure. All 16 high-fidelity UI/UX layouts are already finalized in Figma. We are looking for an architect to build the "frontend shell" for SEO/Ads speed and the "backend engine" for secure data handling.

Core Technical Scope:
• Track 1 (Performance Frontend): Convert Figma designs into a 100% custom-coded environment. Objective: 95+ Mobile PageSpeed Score for optimized Ad-spend and SEO rankings.

• Track 2 (Logic & Security):
o Implementation of a custom pricing engine with dynamic percentage-based fee logic.
o Development of a secure encryption vault for sensitive user credentials (AES-256).
o Integration of a high-end REST API analytics dashboard.
• Track 3 (Payments): Advanced integration of secure payment gateways for tiered subscription plans.

Mandatory Technical Requirements:

• No Page Builders: Zero reliance on Gutenberg, Elementor, or heavy plugins.

• Security-First: Proven experience with OpenSSL and secure data transit.

• Architecture: Ability to build modular, scalable PHP/JS that can handle high-volume data without performance lag.

Note to Applicants: This is a high-confidentiality project. Shortlisted candidates will be required to sign a Mutual NDA before receiving the full Technical Mandate, Brand Identity, and Figma access.