Thien Phu Nguyen

I’m a product-minded engineer who builds B2B SaaS by surfacing product risks, challenging roadmap decisions with structured rationale, and driving outcomes across design, AI, and leadership. I currently lead Circadia as Product Lead, taking it from 0 → 1 while contributing product and engineering work at TSC.ai.

At Circadia, I identified a fragmentation problem in consumer wellness—sleep, focus, and wake tools operate in isolation—then translated it into a clear product vision and go-to-market strategy. I defined ICP, a competitive moat, cold-start and freemium timing, and a three-tier signal architecture (wearable / self-report / passive phone). I also designed acquisition/retention as two intentionally separate quality bars, and I set a leading retention KPI/OKR around D21 insight delivery rate (≥70% of active users receiving first cross-pillar insight by Day 21), while leading a cross-functional team of 3 toward an Android MVP targeted for Q4 2026.

At TSC.ai, I contribute both product and engineering. I diagnosed UX and product context issues (not model quality problems), shipped analytics improvements like transforming a creation-only network graph into a shareable analytical tool with centrality metrics, and managed graph integrity risks pre-ship. On the engineering side, I work on Genie—an AI-driven stakeholders and issues intelligence platform—build RESTful APIs with NestJS using PostgreSQL and Neo4j, develop React front-end functionality, and expand capabilities by integrating Amazon QuickSight, Google BigQuery, and OpenAI GPT APIs.