Senior iOS Engineer | SwiftUI, UIKit, TCA | Madrid, Spain
9+ years building production iOS apps at scale. Led 80% CI/CD optimization and architecture migrations for airline loyalty programs (British Airways, Aer Lingus, Vueling). Expert in secure payments, trunk-based delivery, and scalable mobile architectures.
Available for full-time and contract work | Email | LinkedIn
🏆 $10.5K in hackathon winnings (Moxito)
📱 1M+ users served across airline loyalty apps
⚡ 80% faster CI/CD (40min → 8min builds)
✅ 99.5% crash-free sessions at scale
💬 155+ mentoring sessions with 5/5 stars
🏅 2018 European Innovation Award winner (AccentPOS)
iOS: Swift 6.x, SwiftUI, UIKit, Combine, async/await, The Composable Architecture (TCA), Xcode Cloud, protocol-oriented programming (POP), MVVM+Coordinator, Cocoapods, Swift Package Manager (SPM), Keychain, CallKit, APNs, CallKit, AVFoundation, CoreData, App Tracking Transparency, Privacy Manifest, Deep Linking/Universal Links
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
Security and Payments: SSL Pinning, 3DS2 (EMV 3-D Secure), PSD2 SCA, Apple Pay, Apple Wallet, Google Pay, Auth0 OAuth2/OIDC, Encryption
Cross-platform: React Native (3 years production), Expo, Metro, Hermes, React Navigation, Redux Toolkit, Native Modules
Other: AWS (Lambda, Serverless), TypeScript, ReactJS, NextJS, NodeJS, MongoDB, Localization, Accessibility
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. Live at rumourcast.fun
- 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 iOS Engineer roles (Madrid/Remote EU) and contract iOS/React Native work
Looking for: Product-focused teams that value quality, trunk-based development, and building products users love
Let's connect: LinkedIn • Twitter • Farcaster
📍 Madrid, Spain | 🌍 Open to remote EU opportunities | 💼 Available for immediate contract work