Backend Developer for Public Procurement Marketplace

I have a structured platform operating as a digital marketplace for public administration in Brazil and need a backend developer to secure the system, implement required integrations, and improve usability. Responsibilities include auditing and strengthening security, implementing API integrations with government systems, fixing bugs, and documenting code and APIs. You should have proven backend and API integration experience, solid web security knowledge, and good written English. LGPD/GDPR experience is a plus. Engagement starts with an introductory phase and a paid test task, with potential for long-term fixed monthly pay plus performance-based compensation. NDA and IP assignment required before code access. To apply, start your proposal with "PROCUREMENT" and describe your most relevant security or API experience, along with your hourly rate.