---
title: "Luke Farrell"
description: "Luke Farrell has over a decade in mobile work and contributes to Expo, React Native Image Picker and Camera Roll. Meet the Callstack engineering team."
url: https://www.callstack.com/team/luke-farrell
updated: 2026-10-22T14:18:28.036Z
---

# Luke Farrell

Luke Farrell has over a decade in mobile work and contributes to Expo, React Native Image Picker and Camera Roll. Meet the Callstack engineering team.

_Senior Software Engineer_

Luke is a mobile app developer with more than a decade of experience across user experience, design, and software development. Over the past four years, he has focused exclusively on React Native, contributing to major open source libraries such as Expo, React Native Image Picker, and React Native Camera Roll, while also building more than 30 open source libraries of his own.

[LinkedIn](https://www.linkedin.com/in/lukebrandonfarrell/) · [X](https://x.com/lukebfarrell) · [GitHub](https://github.com/lukebrandonfarrell)

## What I’ve been shipping

- [MCP and Supervisor Agents in eBay's Monitoring Workflow With Leonel Candido da Silva](https://www.callstack.com/podcasts/mcp-and-supervisor-agents-in-ebays-monitoring-workflow-with-leonel-candido-da-silva) (Podcast, 10/13/2026): Leonel Candido da Silva explains eBay's agentic monitoring workflow: specialized agents, MCP, PagerDuty reports, and plans to learn from past incidents.
- [Can Engineers Trust AI Agent Fleets? Nishant Gupta on Scale and Reliability](https://www.callstack.com/podcasts/can-engineers-trust-ai-agent-fleets-nishant-gupta-on-scale-and-reliability) (Podcast, 10/12/2026): Nishant Gupta of Meta explains AI agent fleets, reusable control planes, and why verifying outcomes still matters as teams delegate more work.
- [State Machines for AI Agents With David Khourshid](https://www.callstack.com/podcasts/state-machines-for-ai-agents-with-david-khourshid) (Podcast, 10/12/2026): David Khourshid explains state machines for AI agents, human approval steps, tracing, and handling invalid model outputs in agent workflows.
- [What AI Changes for Paywalls and Monetization](https://www.callstack.com/podcasts/what-ai-changes-for-paywalls-and-monetization) (Podcast, 7/7/2026): Perttu Lähteenlahti (RevenueCat) talks about AI-generated paywalls, MCP tooling, monetization experiments, and what RevenueCat is building next across mobile and web.
- [Where Reanimated Goes Next](https://www.callstack.com/podcasts/where-reanimated-goes-next) (Podcast, 7/7/2026): A conversation with Bartłomiej Błoniarz on CSS animations in Reanimated, native primitives on iOS, shared element transitions, and the work still left on stability.
- [Why Nitro Is More Than a Faster Bridge](https://www.callstack.com/podcasts/why-nitro-is-more-than-a-faster-bridge) (Podcast, 7/3/2026): Marc Rousavy (Margelo) talks Nitro modules, native state, zero-copy data, Vision Camera, and why speed is only part of the story.
- [Redraw for Effects Beyond Skia](https://www.callstack.com/podcasts/redraw-for-effects-beyond-skia) (Podcast, 7/1/2026): William Candillon talks about where Redraw fits next to Skia, from physics-based rendering to camera effects, AR, and new UI patterns.
- [How Voice Agents Handle Latency, Turn-Taking, and Safety](https://www.callstack.com/podcasts/how-voice-agents-handle-latency-turn-taking-and-safety) (Podcast, 6/29/2026): Kræn Hansen (ElevenLabs) talks voice-agent UX, from turn-taking and safety to layered SDK design for React and React Native.
- [The Missing QA Loop for Mobile Agents](https://www.callstack.com/podcasts/the-missing-qa-loop-for-mobile-agents) (Podcast, 6/25/2026): A conversation with Michał Pierzchała on how agents use simulators, logs, screenshots, and accessibility data to verify mobile apps in real workflows.
- [Expo UI with SwiftUI and Jetpack Compose in practice](https://www.callstack.com/events/expo-ui-meets-native-jetpack-compose-and-swiftui-in-practice) (Live Stream, 3/26/2026): Exploring Expo UI with SwiftUI and Jetpack Compose, including setup challenges, architecture tradeoffs, and real-world developer insights.

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