Mobile app engineering for ambitious products

Swift, SwiftUI, UIKit

Architectures: MVVM, The Composable Architecture. Tooling: Xcode, Tuist, Swift Package Manager.

• Offline-first sync, Core Data/Realm
• In‑app purchases, Sign in with Apple
• Accessibility, Dynamic Type, localization

Kotlin, Jetpack

Architectures: MVVM/MVI, Kotlin Coroutines/Flow. Tooling: Android Studio, Gradle, KSP.

• Jetpack Compose or XML
• Room/SQLDelight, WorkManager
• Play Billing, App Bundles, ProGuard/R8

Flutter · React Native

Share a single codebase where it makes sense, keep native extensions for platform‑specific UX and performance.

• Flutter: Riverpod/Bloc, Navigator 2.0
• React Native: TypeScript, Reanimated
• Native Modules, Detox/E2E testing

Secure, scalable services

Node.js, Go, Python. REST/GraphQL/gRPC. AuthN/Z, rate limiting, observability.

• AWS/GCP/Azure, Cloud Run/ECS/Lambda
• PostgreSQL, DynamoDB, Redis
• OpenAPI/Swagger, contract testing

CI/CD, test coverage

XCTest, Espresso, JUnit, MockK, Playwright. Fastlane, Gradle tasks, build pipelines.

• Unit, snapshot, integration, E2E
• Device farms (Firebase Test Lab)
• Release trains, feature flags

Fast, reliable apps

Profiling and budgets: cold start, jank, memory, network, and size.

• p95 cold start ≤ 1.8s, ANR < 0.3%
• Crash‑free sessions ≥ 99.8%
• Tracing, metrics, alerting (Crashlytics, Sentry)

01 · Discover

Product goals, success metrics, risks. Technical audit if applicable.

• Scope & assumptions
• Risks & mitigations
• High‑level architecture

02 · Design

Collaborate on flows and UI. Define API contracts and data models.

• UX flows, wireframes
• Design tokens & theming
• API specs (OpenAPI/GraphQL)

03 · Build

Trunk‑based development with short‑lived branches, code reviews, and CI checks.

• Feature flags, migrations
• Static analysis & lint rules
• Automated test suite

04 · Quality

Regression suite, device matrix, performance budgets, accessibility checks.

• E2E & snapshot baselines
• Device lab runs per PR
• Security review (OWASP MASVS)

05 · Launch

Release trains, staged rollouts, store assets, submissions, and monitoring.

• App Store & Play Console
• Crash & ANR watch windows
• Rollbacks & hotfix playbooks

06 · Grow

Experiment, measure, and iterate. We align engineering with business results.

• Analytics & product telemetry
• A/B tests & cohort analysis
• Roadmap and capacity planning

Fintech onboarding re‑build

iOS + Android · Kotlin/Swift · Feature flags

• Reduced p95 onboarding time by 38%
• Crash‑free sessions from 99.4% ➝ 99.9%
• Weekly release cadence with staged rollouts

Logistics driver app

Android first · Offline‑first · Background sync

• Cut ANR rate to 0.2%
• Offline delivery flow with conflict resolution
• Real‑time telematics and alerts

Healthcare patient portal

Flutter · HIPAA‑aware architecture

• End‑to‑end encryption at rest and in transit
• 90% automated regression coverage on core flows
• App size reduced by 25% with code‑split

Tooling & Stack

• Swift, Kotlin, TypeScript, Dart
• SwiftUI, UIKit, Jetpack Compose, React Native, Flutter
• Gradle, Fastlane, Tuist, SPM
• Firebase, Crashlytics, Sentry
• AWS/GCP, Terraform, GitHub Actions

Quality & Security

• Code review + PR checks on every change
• Static analysis (Detekt, ktlint, SwiftLint)
• Secret scanning, SAST/DAST, SBOMs
• OWASP MASVS best practices
• Threat modeling & secure storage

Metrics we own

• Crash‑free users and sessions
• p95 cold start and jank frames
• ANR rate and error budgets
• Release lead time and change failure rate
• Automated test coverage on core flows

Tell us about your project

Share your goals, timeline, and constraints. We’ll return a tailored plan and estimate.

Company & Legal

• Legal Business Name: clouNine LLC
• Legal Structure: Limited Liability Company (some platforms may display “Corporation” as a general label)
• Address: 1942 Broadway Ste 314C, Boulder, CO 80302, USA
• Email: jason@cloudnineapp.net