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Mobile release trains that do not break

Fastlane, staged rollouts and feature flags — a practical playbook from eighteen App Store submissions without a Friday-night rollback.

Release day should be boring

Mobile teams feel production pain differently: store review delays, irreversible user updates, and crash reports that arrive hours later. A release train turns chaos into a calendar.

The playbook

  1. Trunk-based development with short-lived branches
  2. Fastlane for signing, screenshots and TestFlight uploads
  3. Staged rollouts — 5%, 25%, 100% with crash-rate gates
  4. Feature flags for risky UI, not for broken core flows
  5. Rollback plan — previous build artifact always one click away

React Native specifics

Keep native modules documented, pin dependencies monthly, and run device farms on the two oldest supported OS versions. Most regressions we see are permission or navigation edge cases, not JavaScript logic.

When clients push for daily releases

Explain store review realities early. Internal builds can be daily; public store releases should follow the train unless you have strong automated QA and on-call coverage.

Need help stabilising mobile delivery? Reach the studio.

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Shipping evals before prompts

Why we run regression suites on LLM outputs before every release — and how it changed our AI delivery cadence at ZNN.

Blog

The case for boring web stacks

TypeScript, Postgres and edge deployment are not exciting — they are how you still iterate fast in year three without rewriting the platform.

iGaming · Platform

Casino operator · NDA

Under NDA we stabilised three production gambling brands: cleaned up legacy PHP/JS stacks, extracted shared modules, and shipped a new marketing site without stopping live traffic.

Luxury · Shopify

Her-Age

We rebuilt data flows, updated deprecated endpoints, and clarified status UX so experts, sellers and buyers follow one transparent path from verification to digital passport.

iGaming · Click-to-call

iGaming operator · NDA

Under NDA we built click-to-call for an iGaming VIP desk: agents work the player without ever seeing the number, so the book stays with the operator when someone leaves.