Dulat Theo

I've built and shipped iOS apps across banking, fintech, productivity, and health products, including Opus One: Calendar Planner and WonderPlan. My work spans Swift, Objective-C, UIKit, SwiftUI, React Native, and end-to-end application architecture.

At Crystal Spring, I developed a banking application from scratch, led a six-person iOS team, and mentored more than 20 junior developers. I also contributed to Freedom SuperApp, rated 4.9 from 104k+ App Store ratings, and Onlinebank – Halyk Bank for business customers.

For StockRepublic, I co-developed a social trading app and helped build a white-label product later adapted into Hi!Stocks for Comdirect Bank's 3M+ customer base. I've worked directly with clients, banks, stakeholders, and distributed teams throughout remote contract engagements.

More recently, I've delivered cross-platform planning, subscription, authentication, CloudKit, AWS Amplify, wearable, audio/video, and AI meal-scanning features. I'm comfortable working remotely across time zones and owning products from architecture through App Store release.