Alexander Ng

At Writer, I build enterprise AI products including Agent Builder and AI Studio, helping organizations create secure domain-specific agents, workflows, and applications using governed enterprise knowledge.

I've built Python/FastAPI services for Palmyra inference workflows, evaluation pipelines for groundedness and hallucination risk, and MCP-based integrations with enterprise APIs and systems. My work improved AI response latency by 40% through retrieval optimization, asynchronous execution, semantic caching, and streaming.

Previously at Nubank, I delivered card controls, real-time authorization, dispute-resolution capabilities, and fraud operations tools for millions of customers. At VTEX, I improved order-processing latency by 45% during peak events, and at Wellhub, I helped reduce production defects by 30% through automated testing and CI/CD.

I enjoy solving real customer problems through thoughtful product design, reliable distributed systems, and close collaboration with product, design, AI, risk, fraud, compliance, and business teams.