Senior iOS Engineer — São Paulo, Brazil

CaioAceti

Seven years building iOS for payments, fintech and consumer products — at companies like PayPal, SumUp and iFood. I also design and ship my own apps, end to end.

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I care about the architecture underneath as much as the pixels on top.

Senior iOS engineer with 7+ years building user-centric mobile apps, plus two years at the Apple Developer Academy. I've shipped payments, AI-driven consumer features, EV experiences and regulated healthcare flows — for companies like PayPal, SumUp, Serasa, PicPay and iFood — and published four of my own apps on the App Store.

I work the way I like products to be built: clean architecture, modular code and sane data flow underneath, with motion and detail that make an app feel considered on top.

7+ years iOSApple Developer AcademyWWDC 2022 winnerEnglish C2
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Apps I designed & built

Personal apps — interface and iOS engineering, end to end, by me. Cards cycle through screens; open a case for the full story.

PawslyPawslyPawslyPawsly
01 — iOS

Pawsly

All-in-one pet health companion
SwiftUI · Clean Architecture · Supabase
View full case →
VogaVogaVogaVoga
02 — iOS

Voga

Social network for sustainable fashion
UIKit · MVVM-C · Firebase · CloudKit
View full case →
Lines n' LiesLines n' LiesLines n' LiesLines n' Lies
03 — iOS

Lines n' Lies

Real-time multiplayer party game
UIKit · Node.js · WebSockets
View full case →
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Where I've worked

Seven years across Brazil's and the world's biggest fintech and consumer apps.

Apr 2025 — Present
Independent Consulting
Senior iOS Engineer · remote, US clients
  • PayPal — introduced an AI-agentic development workflow with Claude Code, cutting feature time by 40% while holding the bug rate flat; shipped 5 production features on Package Tracking.
  • Toyota — architected the end-to-end flow for charging EVs at Tesla Superchargers and raised coverage from 0% to 80%. Also: Quittr (+20% monthly revenue) and Wellth (regulated healthcare).
Feb 2024 — Apr 2025
SumUp
Senior iOS Engineer
  • Shipped Pix & Bill Payments (Brazil) and Cards, Transfers & Accounts (Europe) for a payments company across 35+ countries, lifting the App Store rating by 30%.
Feb 2023 — Feb 2024
Serasa
Senior iOS Engineer · Experian
  • Drove +USD $130K in monthly revenue, cut app size by 30MB, raised the rating to 4.8, and built an in-app logging SDK covering 100% of critical flows.
May 2022 — Feb 2023
PicPay
iOS Engineer
  • Reduced bugs and crashes in transfer flows by 70% and migrated 60% of Objective-C modules to modern Swift, on a wallet with 30M+ active users.
Dec 2020 — Nov 2022
Apple Developer Academy
iOS Developer
  • Won the WWDC 2022 Swift Student Challenge; published three authorial apps and taught TDD, Combine, Core Data and SOLID to younger developers.
Feb 2021 — May 2022
iFood
iOS Engineer
  • Authored 10+ payment components used across squads and cut delivery time by 40% per sprint for teams that adopted them, on one of Latin America's highest-traffic apps.
Dec 2018 — Feb 2021
Dextra
iOS Engineer · consultancy
  • Qualicorp, Confidence & Meu Alelo — cut app startup time by 50% and helped save over R$1M / month through in-app automation.
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What I bring

Senior-level depth, backed by what it shipped.

Payments & fintech

Pix, cards, transfers and bill payments shipped at SumUp, PicPay, iFood and PayPal — high-stakes flows where reliability is everything.

Architecture at scale

Clean Swift, VIPER, TCA and MVVM-C, plus reusable SDKs and modular SPM packages that hold up as teams and codebases grow.

Quality & testing

TDD, XCUITests, snapshot and A/B testing. I once took a legacy module from 0% to 80% coverage and made the strategy team-wide.

Modern iOS

SwiftUI, Swift Concurrency, Combine, Core Data and Core ML — with a real eye for Apple's Human Interface Guidelines and accessibility.

Delivery & CI/CD

Fastlane, GitHub Actions, Bitrise and Datadog — observability and analytics wired across 100% of critical flows.

Design & product

I design my own apps end to end. The three below are mine, from first sketch to App Store — interface, motion and engineering.

/ recognition

Recognition

Swift Student Challenge
Winner, WWDC 2022 — a quantum-physics iPad app
Apple Developer Academy
Two-year Apple-sponsored scholarship
OBMEP
3× bronze medal, Brazilian Math Olympiad
4 apps shipped
Published on the App Store
Let's talk

Building something
worth shipping?

caio.aceti.ga@gmail.com