Rafael Escaleira — iOS Specialist at Globo, on Cartola
Cartola is the largest fantasy football game in Brazil. Millions of people open it on the same Sunday afternoon, every round, and the scores have to be right the first time. That constraint is most of what I've learned: how to build native software for a system that can't quietly fail and be fixed on Monday.
Everything below is either something I ship at work, or something I build to make that work repeatable.
Two sibling Swift packages, built as one system. Cosmos is what things look like; Nebula is how they're put together.
| cosmos | A multi-platform SwiftUI design system for iOS, macOS, tvOS, watchOS and visionOS. Tokens, components and patterns that stay consistent across five platforms. |
| nebula | A clean-room Swift foundation and architecture library — the layer everything else is built on, with no third-party dependencies. |
| markly | A SwiftUI markdown e-reader: chapters, multi-colour highlights, an Apple-Books-style toolbar, themes and share. Apple-only stack, Swift 6. |
All three carry CI and coverage, because a design system nobody trusts is just a folder of opinions.
The bet is that AI accelerates the craft and a human owns the outcome. These exist to make that true in practice rather than in principle — by giving the model the same conventions, tests and guardrails a senior reviewer would apply.
| daedalus | A disciplined iOS agent for Claude Code — memory, planning, TDD, subagents and documentation in one plugin. |
| helios | An invisible iOS specialist for Claude Code. Detects iOS projects and validates every change with build, tests, lint and format. |
| ios-spec | A local Ollama model tuned as an iOS engineering specialist, following the Cosmos and Nebula conventions. Built on qwen3-coder:30b. |
| byescaleira-plugin | My own operating system as a Claude Code plugin — codenames, repo template, branding rules, engineering rituals. |
| nova | A reusable documentation template that renders a live OpenAPI spec into a readable site. |
| Cartola | Fantasy football, millions of players every round |
| Next Joy | Kids banking at Banco Next |
Globo / Cartola — iOS Specialist · 2022–Present Deliver IT / Letsbank — iOS Developer · 2022 Next — iOS Developer · 2021 TocaLivros — Mobile Developer · 2020 Boviplan — Mobile Developer · 2019 A.A.A. UFMS — Developer · 2018 CATWORK — Developer · 2017
Core — Swift · SwiftUI · UIKit · Swift Concurrency · SPM Platforms — iOS · iPadOS · watchOS · macOS · visionOS Architecture — Modular SPM · Clean Architecture · MVVM · TDD Tooling — Xcode · GitHub Actions · Fastlane · Firebase AI — LLM APIs · CoreML · Vision · on-device inference
Native first. Platform APIs before cross-platform shortcuts. Apple's frameworks come before abstractions over them.
Design is engineering. Spacing, motion and typography are architecture decisions, and they get the same review as any other interface.
Small modules, clear contracts. A boundary you can test is worth more than a boundary that reads well in a diagram.
Ship, then polish. Working software in production beats a perfect branch.
byescaleira.com · LinkedIn · X