I build reliable web, AI, and software products end-to-end.

Challenge

Real-time trending feed under high concurrency without database lock contention.

Technical decisions

Exponential half-life decay T½=30m; TTL 90m computed in memory; partitioned dual-tier auth (Better Auth + isolated JWT admin); Edge WAF allowlist.

Outcome

Lock-free trending updates, instant feed evaluation, and predictable DynamoDB multi-table GSI scaling.

Technologies: Next.js 15, RSC, React 19, DynamoDB GSI, Vercel AI SDK

Challenge

Intercepting global hotkeys instantly while preventing Spotlight AX paste operations from stealing window focus.

Technical decisions

Carbon C-APIs; Ifrit event-driven fuzzy aggregator; lazy AXUIElement with Toast queue fallback; strict [weak self] safety.

Outcome

Instant hotkey response path, 0 main-thread blocks traced via Instruments, and a clean LSUIElement daemon background footprint.

Technologies: Swift 5.9, Carbon C-APIs, mdfind, Sparkle

Challenge

Fine-grained CPU throttling without kernel instability paired with zero-server-cost offline licensing.

Technical decisions

POSIX SIGSTOP/SIGCONT with proc_pidinfo identity; 3-state license machine; file security 0600; Workers + D1 edge backend.

Outcome

Stable CPU limits across target ranges, zero-infrastructure licensing cost, instant global edge distribution, and offline license verification.

Technologies: Swift Actors, POSIX cpulimit, CF Workers, D1, SQLite

Challenge

High-volume multi-platform post ingestion across social handles with dynamic rate limits, anti-bot blocking, and cross-platform handle duplication.

Technical decisions

Pydantic v2 strict validation; Taskiq + Redis distributed workers; SSE heartbeat 2s to avoid CF 524 on LLM streaming; aioboto3 async S3 + local auto-cleanup; smart handle deduplication.

Outcome

Fast incremental daily crawl cycles, significant bandwidth savings via deduplication, and zero disk bloat.

Technologies: Python 3.12, FastAPI, Taskiq + Redis, PostgreSQL, SSE