What you will do

• Build and maintain Flutter applications for iOS and Android.
• Own features from product refinement and API contract through implementation, store release, and monitoring.
• Model loading, empty, partial, offline, timeout, authorisation, and recoverable error states.
• Collaborate with backend engineers on schemas, pagination, versioning, idempotency, and error contracts.
• Select maintainable architecture and state boundaries appropriate to each product.
• Write focused unit, widget, and integration tests around important behaviour.
• Profile startup, rendering, memory, networking, and mid-range-device performance.
• Maintain signing, CI/CD, TestFlight, Play tracks, phased rollout, and store submissions.
• Use crash reporting and analytics to investigate regressions after release.
• Review human- and AI-generated code and communicate directly with clients.

Required experience

• 5+ years of professional mobile or software development, including 3+ years of production Flutter and Dart.
• At least one Flutter application shipped and maintained on both the App Store and Google Play.
• Strong asynchronous programming and deep experience with at least one production state-management approach.
• Experience integrating REST or GraphQL APIs with explicit failure handling and local persistence or caching.
• Practical automated-testing experience across unit, widget, or integration levels.
• Store signing, release, and post-release monitoring experience.
• Ability to profile and diagnose performance problems and crashes.
• Strong written and spoken English for client calls, reviews, and specifications.

Useful, not required

• Swift or Kotlin and platform channels or plugins.
• Offline-first synchronisation or conflict resolution.
• Fastlane, GitHub Actions, Firebase, Sentry, or equivalent tooling.
• Payments, fintech, healthcare, IoT, or other regulated products.
• Accessibility, localisation, deep links, notifications, or secure storage.
• Previous consultancy, outsourcing, or direct client-facing delivery.

What we offer

• Full-remote work with a flexible schedule outside agreed client and team overlap.
• Full-time independent-contractor engagement.
• 14 paid vacation days and 7 paid sick days per year.
• Official public holidays in your country of residence in addition to the paid days above.
• Work from your own laptop; EthBerry provides the project accounts and paid software licences required for the engagement.
• Compensation agreed individually based on relevant experience.
• Ownership of mobile engineering decisions from API contract through store release.
• The contract does not include health insurance, company hardware, or office-based benefits.

Hiring process

1. Application review.
2. HR screening — 30 minutes.
3. Technical interview — 75 minutes. We discuss a production application, architecture, API failures, offline behaviour, tests, release incidents, and performance diagnosis.
4. Unpaid take-home assignment — strictly capped at 4–6 hours. Build a small paginated list and detail flow using a supplied mock API, with loading, empty, malformed-response, timeout, retry, session-expiry, caching or explicit offline behaviour, and focused tests.
5. Assignment review — 60 minutes. You explain decisions and respond to one changed API or product requirement.
6. Final cultural-fit interview — 30 minutes.

AI coding tools are allowed. Their use must be disclosed briefly, and you must be able to explain and defend every submitted decision. The assignment is not used in production.