David Rynn

Senior iOS Engineer · AI‑Forward Mobile Development

Nine years shipping native iOS apps used by millions across fintech, healthcare, and media — from Chase payment flows serving 80M+ customers to an indie App Store launch built with Apple Intelligence. I lead teams in adopting AI-assisted development: MCP, agentic workflows, and the tooling that makes engineers faster.

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Where I've Worked

Fieldlight Interactive — Independent iOS Product Engineer

2026 – Present

Built and launched Clear Next Step on the App Store — product, design, architecture, and code — using Swift, SwiftUI, and Apple Intelligence / Foundation Models.

Chase — Senior iOS Engineer

Nov 2023 – Present

Own user-facing payment flows for 80M+ customers; refactored networking for a 12% app-wide stability gain. Led the global AI Ambassador Mobile Chapter — the first mobile-focused AI leadership role at Chase — driving MCP, agent frameworks, and AI coding tools across distributed teams.

Maven Clinic — Senior iOS Engineer

Jul 2022 – Oct 2023

Shipped a native SwiftUI debit card feature integrated with Stripe, concept through App Store release; built subscription and payment workflows.

Capital One — iOS Engineer

Jun 2021 – Jun 2022

Built activation and onboarding features with RxSwift, Combine, and Redux; migrated legacy Objective-C to Swift, cutting crash rates.

Prolific Interactive / WeWork & Small Planet — iOS Engineer

2019 – 2021

Agency and consulting work: client apps in fintech, retail, and media; onboarding features with GraphQL and RIBS at WeWork; owned internal CocoaPods and coding standards.

NYC Dept. of Information Tech & Telecom — Mobile Developer

2016 – 2018

Lead developer for Notify NYC, the city's emergency notification app with 25K+ active users.

Before code: public defender with 30+ jury trials. Full resume →

Side Projects

More experiments — wave function collapse, SwiftUI Charts, concurrency demos — on GitHub.

Custom GPTs

Purpose-built assistants I've published on ChatGPT.

Speaking & Community

Toolbox