Strategic Mobile Engineer | React Native, iOS, Solidity | Madrid, Spain
I translate complex technical challenges into systematic solutions. With 9 years scaling apps for millions of users, I bridge high-level architecture decisions with pragmatic, real-world execution.
How I work:
- Strategic: I gather data from multiple sources, assess conditions systematically, and mobilize teams around clear plans
- Autonomous: Self-directed, internally motivated, accountable for outcomes
- Creative + Deliberative: I find original solutions through rigorous analysis
- Behind-the-scenes impact: I prefer driving results over being in the spotlight
Email | LinkedIn | Substack | Twitter
At Checkout.com: Driving React Native SDK feature parity, automating release pipelines, and establishing shift-left QA practices across platform teams.
AI & Knowledge Sharing: Writing about AI harness engineering on Substack — exploring systematic approaches to working with AI, embedding expertise into portable workflows, and building compounding leverage for developers.
🏆 $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
I'm currently exploring how to systematically work with AI — moving beyond ad-hoc prompting to structured, portable AI systems.
My approach: Building AI harnesses that embed expertise, preserve context, and compound knowledge over time.
Recent writing: Why am I learning AI harness engineering?
- How to save time with
AGENTS.mdandCLAUDE.mdfiles - Creating specialized subagents (DevOps, mobile, code review)
- Protecting critical thinking while leveraging AI
- Building compounding leverage in a landscape of changing models
Currently learning: Walking Labs Harness Engineering course
When facing ambiguity, I:
- Gather data from multiple sources and assess conditions systematically
- Balance exploring new possibilities with taking decisive action
- Create backup plans while remaining adaptable to change
When architecting solutions, I:
- Think abstractly and conceptually, then translate into concrete implementation
- Combine imagination, logic, and rigor — the best outcomes require all three
- Focus on direct, real-world consequences of technical decisions
When collaborating, I:
- Prefer small circles of close contacts (quality over quantity)
- Tell people honestly what I think and hold them accountable
- Stay behind the scenes while driving strategic outcomes
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
AI & Automation: AI Harness Engineering, AWS AI/ML, Systematic prompting workflows, AGENTS.md patterns
Other: Rust, AWS (Lambda, Serverless), NodeJS, Supabase, MongoDB, Localization, Accessibility, Scriptable
React Native SDK Strategy & Execution
- Drove SDK to full feature parity with native SDKs — translated product requirements into technical roadmap
- Architected critical payment processing features balancing innovation with security constraints
Release Pipeline Automation (Planner archetype in action)
- Automated mobile release pipelines, eliminating manual friction and reducing release cycles
- Result: Faster, more reliable releases with systematic rollback plans
Quality Strategy: "Shift-Left QA"
- Strengthened E2E test reliability, reducing test suite execution time by 50%
- Designed and POC'd config-driven E2E testing framework
- Established systematic testing practices across iOS, Android, and React Native teams
Security & Risk Mitigation
- Resolved critical security vulnerabilities using systematic risk assessment
- Implemented secure coding practices for payment-sensitive codebases
Cross-Platform Consensus Building (Strategist trait: mobilizing others)
- Built alignment across iOS, Android, and React Native platform teams
- Introduced mobile engineering practices that balanced innovation with pragmatism
AI & Developer Productivity
- Applied AI harness techniques for cross-platform collaboration, boosting team productivity
- Building systematic approaches to embed mobile development expertise into AI workflows
- Led UIKit → SwiftUI → React Native migration, reducing codebase by 60%
- Cut release cycles from 8 to 2 weeks, enabling 3x faster feature delivery for 1M+ users
- Integrated payment providers and secure authentication (3DS2, Apple Pay)
- Established TDD/BDD practices with XCTest across teams
- Reduced CI/CD build times by 80% (40min → 8min)
- iOS app, Node.js backend, real-time sync
- Payment integrations (Star Micronics, Paymentsense, EVO)
- Won 2018 Business Innovation Award
- Google Ads SDK integration
- High-impact bug fixes with test coverage
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
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.
- Substack: Writing on AI harness engineering — systematic approaches to embedding expertise into AI workflows
- Codementor: 5-star rating, 155+ sessions — mentoring on mobile architecture, React Native, iOS
- Internal: Led "shift-left QA" sessions; building consensus on mobile best practices
