Full-Stack Developer to Implement Subscription Billing & Secure Authentication for Constructefy App

Futura USA is looking for an experienced full-stack developer to enhance our Constructefy application by implementing a complete subscription and user authentication system. Project Scope Subscription & Billing * Implement subscription-based access plans * Integrate a secure payment gateway (Stripe preferred, open to recommendations) * Manage recurring billing and subscription renewals * Handle upgrades, downgrades, cancellations, and payment failures * Restrict or grant access based on subscription status * Create subscription management screens for users Authentication & User Management * Build secure user registration to the login functionality * Implement multi-factor authentication (2FA) * Support authentication via: * Email verification codes * SMS/text verification codes * Password-based login * User account management (profile, password reset, email updates, etc.) * Session management and security best practices * User notifications for account activity and authentication events Requirements * Proven experience with subscription billing systems and payment integrations * Experience implementing secure authentication and authorization workflows * Strong understanding of security best practices, MFA, user access control, and account protection * Ability to work within an existing application and codebase * Excellent communication and documentation skills When Applying, Please Include * Relevant projects you’ve completed involving subscriptions and user authentication * Your preferred payment platform(s) and why * Your estimated timeline for completing this project * Your hourly rate or fixed-price proposal We are looking for someone who can deliver a secure, scalable, and production-ready solution with clean, maintainable code.