One-man studio. 12+ years of product engineering experience.
I have shipped products across consumer and business verticals including fitness, fintech, weather, logistics, media, and productivity. I now partner with founders and teams to build robust mobile/web products and practical AI-enabled experiences.
Studio Services
JST.Studio works directly with founders and product teams — shaping ideas, designing architecture, and shipping production-grade products with strong engineering standards.
Delivery & Track Record
From solo engineering to leading teams of 20+ developers — delivering scalable, production-grade apps across fintech, fitness, logistics, media, and productivity.
Shipped products across fitness, weather, logistics, fintech, and media
Led end-to-end delivery across API, web, and mobile surfaces
Scaled iOS engineering standards across teams of 20+ developers
Applying AI to product workflows, mobile features, and user experiences
Portfolio
Over 12 years, the work has spanned consumer and enterprise apps across mobile, web, and AI. Each project below represents a real product shipped to real users.
Lifestyle & Productivity · Featured Build
Led iOS mobile development for Atoms, the official companion app to Atomic Habits by James Clear — a New York Times best-seller. Built and led the mobile engineering effort, delivering a daily habits tracker grounded in behavior science used by readers worldwide.
Swift · iOS · Mobile Lead · 2+ years
Visit Atoms →Fintech & Banking
Contributed iOS engineering from the initial launch through multiple product areas of Fi, a consumer banking and money management app. Set engineering standards and shipped across the product from day one.
Swift · iOS · Fintech
fi.money ↗Fitness & Health
Led iOS development across multiple fitness products, enabling users to track their workouts from various devices, trackers, and HealthKit. Built end-to-end from architecture and API integration through App Store delivery.
Swift · iOS · HealthKit · REST APIs
Logistics & Transportation
Delivered iOS apps across transportation verticals: fleet and trucking logistics with real-time tracking, a parking management platform with location-based workflows, and highway toll integration. Built for field reliability.
Swift · iOS · Real-time Sync · Maps
Weather & Utilities
Shipped a weather utility app with clean UX and dependable location-based data pipelines — a space where engineering precision and design attention make all the difference.
Swift · iOS · Location APIs
News & Media
Built a personalized news feed aggregated from various sources across multiple local languages. Developed the iOS app and web platform end-to-end, including a custom NLP engine for topic detection and content personalization.
Swift · iOS · NLP · Play Framework