Senior iOS Engineer & AI · São Paulo

Hello, I'm Bruno Mello

Crafting exceptional mobile experiences with 8+ years in Swift, SwiftUI, and Clean Architecture — building scalable, performant apps for PayPal, WHOOP and Venmo. Integrating AI & machine learning into iOS, now reaching into Spatial Computing and Apple Intelligence.

Get in touch View experience
PortfolioView.swift 
import SwiftUI

struct PortfolioView: View {
  var body: some View {
    VStack(spacing: 16) {
      Text("Hello, World!")
        .font(.largeTitle)
      Spacer()
    }
    .animation(.spring())
  }
}
Scroll

01 — About

The human behind the craft

I'm a Senior iOS Engineer with over 8 years building apps that are fast, reliable and a pleasure to use. I started in Objective-C, quickly embraced Swift and SwiftUI, and I'm now diving into Spatial Programming on Vision Pro and integrating AI / Machine Learning into native iOS workflows. I'm passionate about clean architecture, reactive programming, and delivering pixel-perfect UX — and I'm looking to scale my impact as an iOS Architect.

I've designed scalable architectures — MVVM, VIPER, TCA — and lean on Combine and RxSwift to keep apps testable, modular and decoupled.

Whether integrating APIs, squeezing out performance, or shaping clean, maintainable code, I enjoy every step of building products people genuinely love.

0+
Years crafting iOS
0+
Roles & shipped apps
0%
Swift native

02 — Experience

A flight path through iOS

Ten roles, one obsession: shipping apps that feel inevitable.

iOS Software Engineer

PayPal Mar 2024 — Present
  • Built features with Swift and UIKit using View Code
  • Maintained legacy Objective-C codebases alongside Swift modules
  • Implemented reactive data flows with RxSwift and RxCocoa
  • Wrote unit and automation tests for reliability and performance
  • Consumed RESTful services to power real-time app data
  • Firebase Remote for server-driven feature flags on/off without app updates
  • Crashlytics for crash triangulation and bug resolution across millions of users
  • Google Analytics to track usage patterns and identify UX improvements

iOS Software Engineer

WHOOP Feb 2023 — Feb 2024
  • Built features with SwiftUI and UIKit
  • Maintained legacy code written in Objective-C
  • Leveraged the Combine framework for reactive event handling and data binding
  • Wrote unit and UI tests to ensure app quality and stability
  • Consumed RESTful services for seamless data synchronization
  • Firebase Remote for server-driven feature flag management
  • Crashlytics for crash analytics and bug triage across high-traffic usage
  • Google Analytics to monitor engagement and inform product decisions

iOS Software Engineer

Klever Apr 2021 — Jun 2023
  • Developed apps with SwiftUI 3.0, Combine and iOS 15, improving performance
  • Implemented gRPC via Protocol Buffers for efficient data communication
  • Adopted TCA (The Composable Architecture) for testable, reusable modules
  • Gained hands-on experience with blockchain technology and crypto wallets
  • Built data layer with GRDB, CoreData, UserDefaults and FileManager
  • Firebase for real-time data sync and user authentication
  • Bugsnag + Crashlytics for error tracking — significantly reduced crash rates
  • Xcode Cloud CI/CD for faster deployment cycles and version control with GitHub
  • OneSignal push notifications boosting user engagement; Deep Links for navigation

iOS Software Engineer

Venmo May 2022 — Feb 2023
  • Built features with Swift, UIKit and View Code
  • Built reactive programming model with RxSwift, RxCocoa and RxTests
  • Managed dependencies using CocoaPods, Carthage and SPM
  • Implemented MVVM design pattern and Coordinators for maintainable architecture
  • Led app Modularization, implemented Deep Links and Dynamic Links
  • CI/CD with Buildkite; wrote and ran unit, regression and UI tests
  • Ensured all products met accessibility standards for inclusive experiences
  • Jira task management, analytics and Crashlytics for performance monitoring

iOS Software Engineer

SKY Brasil Aug 2020 — Aug 2021
  • Led implementation of new features, enhancing app functionality and UX
  • Designed components aligned to the company's Design System
  • Used View Code and Coordinators for clean, modular code organization
  • Optimized algorithms for faster execution and improved performance
  • Rigorous testing: unit, performance and interface tests for quality assurance
  • Maintained legacy code ensuring continuous app functionality and risk mitigation
  • Firebase Analytics for in-depth error analysis, reducing bug occurrence

iOS Software Engineer

ModalMais Home Broker Mar 2020 — Aug 2020
  • Spearheaded innovative feature implementations driving app enhancements
  • Crafted components aligned to the company's Design System
  • Used Xibs and Coordinators for efficient, modular code structure
  • Built reactive functionality with RxSwift and RxCocoa
  • Optimized existing algorithms for improved execution times
  • Meticulous testing: unit, performance and interface tests for quality assurance
  • Maintained legacy code reducing system vulnerabilities and ensuring continuity
  • Fabric + Firebase Analytics for detailed error analysis and rapid bug resolution

iOS Software Engineer

PagSeguro PagBank Jul 2019 — Mar 2020
  • Built new features using Xibs and Coordinators for clean architecture
  • Maintained legacy code optimizing performance, speed and stability
  • Implemented accessibility support ensuring inclusive experiences for all users
  • Rigorous testing: unit, performance and interface tests for app stability
  • Managed legacy code reducing vulnerabilities and ensuring continuous performance
  • Fabric + Firebase Analytics for in-depth error analysis and rapid remediation

Lead iOS Developer

Megaleios Mobile Jan 2019 — Jul 2019
  • Maintained and developed features in Objective-C and Swift, improving app stability
  • Built new features using Storyboards and Xibs with Coordinators for better UX
  • Deployed numerous apps to the App Store with full distribution management
  • Analyzed app analytics via Fabric and Firebase to drive feature development decisions
  • Integrated Firebase and Cloud Firestore for real-time data synchronization
  • Implemented geolocation with Google Maps, Mapbox and MapKit
  • Managed internal testing via TestFlight and Installr, reducing post-release bugs
  • Integrated SOAP, REST and JSON/XML services for robust data communication
  • Managed App Store Connect, Ad Hoc and Enterprise certificates for distribution readiness
  • Integrated Facebook APIs expanding social networking capabilities
  • OneSignal push notifications boosting user engagement

iOS Developer

Mobile Saúde Jan 2018 — Jan 2019
  • Maintained Objective-C legacy codebase and developed new Swift features
  • Built UI using Storyboards and Xibs for polished user experiences
  • Used fastlane for continuous app updates, fixes and App Store releases
  • Managed TestFlight internal testing reducing post-release bugs
  • Firebase integration for real-time data updates and user authentication
  • Integrated REST/JSON services for app communication layer
  • Fabric + Firebase Analytics tracking usage patterns and engagement metrics

iOS Jr Developer / Trainee

Pag! Jan 2017 — Jan 2018
  • Maintained and developed features in Swift, improving performance
  • Built UI with Storyboards and Xibs for responsive interfaces
  • Firebase integration for real-time database synchronization
  • Google Maps and MapKit for geolocation features
  • Managed TestFlight internal testing cycles
  • Interactive REST/JSON service integrations for data flow
  • Fabric + Firebase Analytics tracking user engagement patterns

03 — Skills

An engineer's toolkit

Languages, frameworks and patterns I reach for.

Languages

Swift Objective-C Java C/C++

iOS Frameworks

SwiftUI UIKit Combine RxSwift Vision Pro SDK

Architecture

MVVM VIPER TCA Clean Arch

Data & Backend

REST APIs gRPC Firebase CoreData Core Data (GRDB)

Tooling & DevOps

GitHub Xcode Cloud Xcode Cloud CI/CD Fastlane SPM CocoaPods Carthage

Testing & Analytics

Unit Testing UI Testing Integration Testing Crashlytics Bugsnag Firebase Analytics Google Analytics

AI & Machine Learning

AI Engineer Anthropic Claude Core ML Vision Core ML Tools

Services & APIs

OneSignal Push Deep Links / Dynamic Links Mapbox / Google Maps Firebase Firestore Facebook APIs SOAP / REST / GraphQL

Design & Patterns

Coordinators View Code Design Systems Accessibility (a11y) Modularization Feature Flags

04 — Selected Work

Apps in millions of pockets

Venmo
Swift UIKit MVVM

Venmo

Contributed to one of the world's leading peer-to-peer payment platforms — helping millions send and receive money seamlessly.

Visit app
WHOOP
SwiftUI Combine HealthKit

WHOOP

Built iOS features for the premium fitness & recovery platform athletes rely on to track performance.

Visit app
Klever
Swift Core Data Clean Arch

Klever

Built components for the crypto wallet platform — securely managing, trading and staking digital assets.

Visit app
Glance
SwiftUI Combine TCA

Glance

Developed features for the customer-experience platform, surfacing insights that improve every interaction.

Visit app

05 — Education

Always calibrating

Computer Science, Bachelor

Centro Universitário FMU · FIAM-FAAM

2024 — Completed

Java Development

Caelum

2017

Oracle Database 12c

Instituto Infnet

2017

Scrum Master

Scrum.org

2017

iOS Development

Udemy

2017

06 — Certifications

Continuously sharpening the craft

Machine Learning for iOS Developers

Udemy / Specialization

Certified

Unit Testing for iOS Developers

Udemy / Specialization

Certified

07 — Writing

Sharing what I learn on the way

Deep dives into local AI, Apple Silicon performance and Swift architecture — published on DEV.

DEV.to May 2026

Running a Fully-Local AI Agent on a Mac Studio — OpenClaw + Ollama + MLX

A real-world guide to running a personal WhatsApp AI agent entirely on-device with Apple Silicon — zero per-token API billing. Includes benchmarking MLX vs Ollama across quantized models on an M3 Ultra (96 GB).

Local AI Apple Silicon MLX OpenClaw
Read article
DEV.to 2026

Running Local LLMs as Your AI Coding Assistant on Apple Silicon

How to set up and run local language models on Apple Silicon as a daily AI pairing partner for Swift development — no cloud, no API keys, full privacy.

AI Coding Apple Silicon LLM
Read article
DEV.to 2026

Unidirectional Data Flow Architecture in SwiftUI

A practical guide to building clean, testable SwiftUI apps using unidirectional data flow — leveraging TCA principles, reducer patterns and predictable state management.

SwiftUI Architecture TCA
Read article

08 — Based in

São Paulo, Brazil

São Paulo

The largest city in Brazil and Latin America's leading tech hub — home to countless startups, scale-ups and innovation centers.

Tech Hub
Innovation
Global City
Maps — São Paulo, BR

09 — Contact

Let's build something

Have a project, a role, or a spatial idea? My inbox is open.

Emailbruno.guitarpro@gmail.com LinkedInin/bruno-lopes-de-mello GitHubgithub.com/BrunoCerberus