Senior Mobile Engineer | React Native, iOS, Solidity | Building on Farcaster and Web3 | Madrid, Spain
I'm a Senior Mobile Engineer with 9 years scaling apps for millions of users. At Avios (IAG Loyalty), I led the UIKit -> SwiftUI -> React Native migration for British Airways, Aer Lingus, and Vueling—reducing codebase by 60%, cutting release cycles from 8 to 2 weeks, and enabling 3x faster feature delivery for 1M+ users. I've reduced CI/CD build times by 80%, integrated secure payments (3DS2, Apple Pay), and established TDD practices across teams.
Earlier, I co-founded AccentPOS, building a full-stack POS system with iOS app and payment integrations, which won a 2018 Business Innovation Award. I'm also a 5-star Codementor with 155+ sessions, and recently won 2 hackathons with Moxito, a Web3 fitness rewards app on Farcaster, and 10+ frames and iOS widgets.
I'm currently exploring opportunities where I can combine mobile architecture, team leadership, and emerging tech like Web3, in a remote-first environment.
Available for full-time and contract work | Email | LinkedIn
🏆 $10.5K in two hackathon winnings (Moxito)
📱 1M+ users served across airline loyalty apps
⚡ 80% faster CI/CD (40min → 8min builds)
✅ 99.5% crash-free sessions at scale
🏅 2018 European Innovation Award winner (AccentPOS)
💬 Earned a 5/5-star rating on Codementor (155+ sessions) and consistently recommended by engineering leadership on LinkedIn for communication and architectural insight
Check it out here: https://www.codementor.io/@christian.leovido
Recommendations: https://www.linkedin.com/in/christianleovido
Mobile & Frontend: React Native (Expo), iOS (Swift, SwiftUI), Android (Kotlin), JavaScript, TypeScript, React, Next.js
React Native: Expo, Metro, Hermes, React Navigation, Redux Toolkit, Native Modules.
iOS: Swift 6.x, SwiftUI, UIKit, Objective-C, async/await, Swift Package Manager, Keychain, Deep Linking/Universal Links.
Crypto/Web3: Smart Contracts (Solidity, Foundry), Wallet Integration (WalletConnect), ethers.js, viem, ZK Proofs (Noir), Farcaster SDK
Security and Payments: SSL Pinning, Secure Enclave, Keychain, Keystore, Biometrics (Face/Touch ID), 3DS2 (EMV 3-D Secure), PSD2 SCA, Apple Wallet, Google Wallet, Auth0, OAuth2/OIDC.
Testing and Quality: TDD/BDD, XCTest, XCUITest, Given-When-Then, Jest, Feature Flags, Crashlytics, Firebase, Instruments profiling, Cypress, Charles Proxy.
DevOps and Release: Fastlane, GitHub Actions, CI/CD, App Store Connect, TestFlight, Trunk-based development, Git (rebase/squash/fixups), Docker.
Other: Rust, AWS (Lambda, Serverless), NodeJS, Supabase, MongoDB, Localization, Accessibility, Scriptable
SwiftUI • TCA • HealthKit • TestFlight
Farcaster rewards tracking app with privacy-first architecture. Won 2 hackathons on Devfolio.
- 100 TestFlight users in first 3 months
- 1.1K Farcaster followers on launch
- HealthKit integration for activity rewards
https://www.codementor.io/@christian.leovido
Avios (IAG Loyalty) - British Airways, Aer Lingus, Vueling loyalty apps
- Led UIKit → SwiftUI → React Native migration
- Integrated payment providers and secure authentication
- Established TDD/BDD practices with XCTest
AccentPOS - Full-stack POS system (Co-founder)
- iOS app, Node.js backend, real-time sync
- Payment integrations (Star Micronics, Paymentsense, EVO)
- Won 2018 Business Innovation Award
Luzia AI - Consumer iOS app
- Google Ads SDK integration
- High-impact bug fixes with test coverage
SwiftUI • MVVM • Combine • async/await
Star Wars planet browser showcasing modern iOS patterns. Take-home exercise that landed me the Luzia job.
The Composable Architecture • SwiftUI • SPM
Finance demo with modular architecture. Take-home that got me an offer from "Much Better".
Pure Functions • Monads • State Management
Swift port of "13 Ways of Looking at a Turtle" from F#. Exploring functional patterns in iOS.
Zero-Knowledge Proofs • Farcaster Protocol
Anonymous Farcaster client using Noir ZK proofs.
- Codementor: 5/5 rating, 85+ sessions, 155+ mentoring sessions
- AWS Certified: Cloud Practitioner, AI Practitioner
- Active contributor to iOS and web3 ecosystems
Exploring: Farcaster protocol, React Native architecture patterns, modern iOS development
Available for: Senior Mobile Engineer roles (Madrid/Remote EU) and contract iOS/React Native work
Looking for:
I’m looking for a role that sits right at the intersection of deep R&D and high-velocity shipping.
First, I want technical variety. I thrive when I can jump between projects—applying what I’ve learned about ZK or Wallet infrastructure in one context to solve problems in another. I don't just want to write code; I want to expose myself to the breadth of the Web3 ecosystem.
Second, I’m looking for a team where I can act as a force multiplier. I’ve been building an internal orchestration tool to automate best practices and leverage AI for development. I want a culture where I can deploy systems like this to help not just my team, but the entire engineering studio move faster.
Finally, I want meaningful work. Whether it’s bridging TradFi to DeFi or solving identity privacy, I’m looking for equity and ownership in projects that are actually pushing crypto adoption forward.
Let's connect: LinkedIn • Twitter • Farcaster
📍 Madrid, Spain | 🌍 Open to remote opportunities | 💼 Available for immediate work