Senior Founding Android & Backend Engineer

Founding engineer (1st hire) at Regain — co-built a Kotlin/Jetpack Compose productivity app from zero to 3.5M+ downloads, 4.6 across 116K reviews, and ">=99.5% crash-free sessions. Shipped 9,000+ commits across two production consumer Android apps over 3 years (Regain + Brainpal). Full-stack ownership: Android + Python/FastAPI backend + self-managed Hetzner cluster. Originated and shipped Brainpal (4.7), now Regain's second app, live globally. Looking for: Founding Engineer, Senior Android, or Senior Mobile roles at small/mid-stage startups. Remote, USD comp via Deel/EOR-style setup. Comfortable across mobile + backend + infra.