Guilherme Caramori

Senior full stack developer and go-to engineer for technical questions at Performa.AI, an intelligence and conversion platform for e-commerce. I develop APIs, catalog and order integrations, and tools embedded in stores.

• Reliable order processing: I implemented idempotent webhook processing to prevent duplicate records in a service with more than 150 connected clients and thousands of requests per minute, keeping data consistent for recommendation evaluation.
• E-commerce integration automation: I developed and maintained catalog and order integrations with platforms such as Shopify, Nuvemshop, and Loja Integrada, automating updates to the data used by Performa.AI tools and reducing the need for manual intervention.
• APIs and security: an API backed by replicated MongoDB with JWT, HMAC, and rate limiting, serving thousands of daily accesses.
• Platform partnerships: technical discussions to obtain integration guidance and support partnership agreements.
• Support and clients: assistance to the support team, client-specific implementations, and resolution of complex technical issues.
• Mentoring: helping early-career professionals with day-to-day technical questions and decisions.
• Production efficiency: I optimized JavaScript scripts and data access routines, reducing loading times for tools embedded in stores and database resource usage.
• AI automations: WhatsApp workflows with AI, MCP, and RAG, alongside work on payments and auditing.

My freelance experience includes websites, web platforms, corporate intranets, scheduling systems, and email marketing automations. I work from requirements gathering through production delivery, covering frontend, backend, integrations, and maintenance.

• Corporate intranet: an internal communication system with a photo archive and a noticeboard.
• Email marketing: a sending queue built with Bull Queue, Node.js, and Amazon SES, deployed to a DigitalOcean VPS.
• Dental clinic: an appointment scheduling system with management of doctors, staff, and available time slots.
• Academy platform: student acquisition, registration, authentication, recurring payments via GoCardless, and PostgreSQL/Prisma.
• Gym website: a responsive commercial website with service information, social proof, and calls to action for contact.