Backend Developer for SaaS

Backend developer needed for a live B2B SaaS built for French SME leaders. Need help finishing an OAuth2/API integration with Google Ads and running a security review covering authentication, sessions, encrypted tokens, and API endpoints. French is required as the main working language; English is welcome. An NDA and non-compete/non-solicitation clause must be signed before any code or data access. Remote, freelance, hourly billing. Please apply with your rate, relevant experience, and availability.