I make real tools — bots, agents, workflows.

Three days, one transformation. Recovery score (0–100) from HRV, resting HR, and sleep — rendered as a glowing ring on Today. Full strain engine mapping heart rate zone minutes to a 0–21 scale with a live intraday chart updating every 15 minutes. Stress Monitor classifying autonomic state (Optimal / Balanced / Low) from HRV variability and sleep fragmentation. Weekly Assessments: 7-day summary, Healthspan Index, and Correlation Insights. Respiratory rate had three stacked bugs — wrong filter, wrong parser, timezone offset silently dropping Panama 10 PM data from the UTC window. All fixed, two weeks backfilled. Coach rebuilt as a real chat: bottom-anchored, markdown tables.

Complete visual rebuild against a Claude Design spec — 22-component audit, 50 pull requests, dark-first token system with WCAG AA across three themes. New ring+pulse logo-mark, 6-keyframe SplashScreen, rebuilt PWA icons, MetricTile with coloured delta arrows, shared PageHeader with day-over-day deltas, SpO₂ reference band on every chart. Coach screen added: streaming Claude responses, markdown rendering, keyboard-safe layout. Trends screen overhauled: period toggle, real 30-day averages, mini-sparklines.

Added Fitbit support via Google Health API OAuth2 — second ingestion path alongside the Galaxy Watch companion app, same schema, device-agnostic. Five vital types only support the list endpoint (not dailyRollUp); that's a method-support constraint in the spec, not inferrable from the 400 error body. SpO₂ stored as daily median to resist outlier sensor readings; Samsung and Google Health pipelines de-collided so neither overwrites the other.

Two dedicated verticals — food & beverage and pet nutrition — from a single codebase, each with its own search experience and brand-level output. Four data sources run in parallel: Firecrawl (3 simultaneous searches across regional market data, global benchmarks, and industry reports), Google Trends (12-month search interest across 9 countries — CR, GT, DO, PR, PA, SV, HN, NI, JM — with direction signals and rising queries), YouTube (top Spanish-language videos from the last 6 months ranked by views), and Reddit (consumer conversations surfaced via Google Custom Search). Each query produces a full brief in under 3 minutes: three classified trends (Alto Momentum / En Ascenso / Emergente) with global benchmarks, emerging signals with cross-regional context, three key stats plus a consumer quote, strategic recommendations, consumption frequency, use occasions, three to five recipes with regional framing, and one tailored opportunity per brand. Country chips color-coded — green, amber, grey — with a search-term hint when low scores are terminology-driven. One-click print/PDF export. Full search history per vertical.