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Swift Package Manager can transform a slow, tangled iOS monolith into a fast, modular codebase — but only if you draw the right boundaries. This episode breaks down the practical strategies that make it work in real projects.

Show Notes

Monolithic iOS codebases have a way of growing quietly out of control — slow builds, tangled dependencies, and features bleeding into places they were never meant to go. This episode of DEV.co tackles the problem head-on, drawing on this guide to Swift Package Manager and modular iOS architecture to lay out a clear, practical path from chaos to clarity. Whether you're starting a new project or migrating years of legacy code, the principles here are grounded in how real teams actually ship software.

Here's what the episode covers:

  • Why modularity pays off: Cleaner ownership, faster issue isolation, and build times that improve as the codebase grows — rather than spiraling upward.
  • Drawing good boundaries: The key questions that reveal where one module should end and another begin, including the difference between functional modules (by feature) and layered modules (by technical role).
  • Designing a minimal public API: Why defaulting to internal access and keeping initializers narrow isn't just tidy — it protects the maintainability of every module over time.
  • Managing dependencies with discipline: How to evaluate whether a new external package is truly necessary, how to pin versions intentionally, and why transitive dependencies deserve more attention than most teams give them.
  • CI and reproducible builds: The case for committing Package.resolved as a single source of truth, and how to structure caching so that unchanged modules never get recompiled unnecessarily.
  • Testing and migration strategies: Giving each package its own test target and fixtures, keeping the test suite fast enough to run habitually, and moving from CocoaPods or Carthage in calm, verifiable increments rather than a risky overnight switch.

The episode closes with a reminder that tooling only gets a team so far — naming conventions, documentation, and shared norms about where new code belongs are what make modular architecture sustainable. More from the show: check out the episode Website Design Costs in 2026: What AI Actually Changes and What It Doesn't for another look at how evolving tools reshape real engineering and business decisions.

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What is DEV?

Software and web development from the side that has to ship it and then live with it. Architecture decisions with a cost attached, scoping, technical debt, hiring and vendor selection, and the AI tooling question every engineering team is now answering whether they planned to or not.

Each episode takes one decision — rewrite or refactor, framework choice, build versus buy, how to scope a fixed-bid project honestly — and works through the tradeoffs, including the ones that only show up in year two. Written for engineering leads, technical founders and the people who fund them. Five or six minutes, no hand-waving.

Topics include rewrite versus refactor, build versus buy, scoping fixed-bid work honestly, technical debt you should keep, framework and platform choices, hiring and vendor selection, code review culture, and where AI tooling actually helps.

Produced by DEV.co, web and software development. Full details, services and further reading at https://dev.co