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Demonic Binary
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Services / Mobile Engineering

Mobile App Development, Security & Performance.

From concept to launch and beyond, Demonic Binary develops and strengthens iOS and Android applications. We deliver native interfaces, secure API integrations, performance improvements and practical release support.

Get StartedMobile App Repair
CONCEPTUAL ARCHITECTURE / MOBILE + APISession, API and data boundaries
  1. 01

    Swift / Kotlin

  2. 02

    Session token

  3. 03

    API endpoint

  4. 04

    Backend policy

    Backend authority

  5. 05

    Tenant-owned data

An authenticated request still needs object-level authorization and predictable token-failure handling.

Conceptual system design, not an undisclosed customer architecture.

Choose a starting point

Solutions for every stage of your app.

Build a mobile app

New MVP, customer app, internal tool or a second-platform release. Start with user flows, scope and the right native or shared-code choice.

Plan an app build

Fix an existing app

Crashes, ANRs, missing source/build ownership, login loops, broken SDKs or an App Store / Google Play rejection. Start with reproduction.

Get help fixing an app

Improve a live app

Modernize Swift/Java code, improve performance or accessibility, strengthen test coverage and create a safer update cadence.

Review modernization

Platform engineering

Native first when platform behavior matters.

Apple iOS & iPadOS

Swift, SwiftUI and UIKit; structured concurrency; Keychain, Secure Enclave and App Attest where justified; push, local storage, accessibility, TestFlight and App Store Connect.

Native iOS services

Android

Kotlin, Jetpack Compose and existing Views; Coroutines/Flow, Room, WorkManager, Credential Manager and Play Integrity; Android vitals, Android App Bundles and Play Console.

Native Android services

Shared code where appropriate

Evaluate Kotlin Multiplatform, Flutter and React Native against the actual device APIs, performance budget, team ownership and long-term maintenance cost. Native remains an option.

Compare cross-platform options

Mobile application services

Build, improve and protect your mobile applications.

Explore development, modernization, integration, security, quality assurance and release services for iOS and Android.

01 / Mobile

Build & design

Start a new mobile product, improve its interface or choose a shared-code strategy.

02 / Mobile

Fix & modernize

Take over a broken app, remove performance bottlenecks, migrate safely and strengthen tests.

03 / Mobile

Integrate, ship & maintain

Connect APIs and devices, manage purchases and releases, and operate a bounded maintenance plan.

Capabilities

Mobile engineering from interface to infrastructure.

Connect user experience, native platform behavior, backend services and operational reliability across the full application lifecycle.

Product & UX

  • Discovery, MVP definition and technical feasibility
  • Wireframes, UX flows, reusable UI and responsive layouts
  • Accessibility, localization and dark mode
  • Onboarding, account settings and customer journeys

Core features & integrations

  • REST/GraphQL APIs, identity and passkeys
  • Push notifications, deep links and messaging
  • Maps, location, camera, media and file workflows
  • Payments, subscriptions and backend entitlements

Platform & enterprise

  • Offline storage, sync and conflict resolution
  • NFC, BLE, QR/barcode and supported device integrations
  • Enterprise SSO, managed devices and shared-device flows
  • Tablet, foldable, iPad and device-specific layouts

Quality & operations

  • Crashes, ANRs, app startup and memory profiling
  • Unit, UI, integration and device matrix tests
  • Signing, CI/CD, TestFlight and Google Play releases
  • Dependency upgrades, monitoring and maintenance scope

Delivery

From concept to production.

01 / Diagnose or discover

Review goals, existing apps, code ownership, target devices, risk and integration constraints.

02 / Define scope

Agree on the smallest shippable milestone, technology choices, access and acceptance tests.

03 / Build & validate

Implement reviewable changes with device, error, accessibility and security tests relevant to the feature.

04 / Release & hand off

Prepare customer-owned store builds, rollout notes, monitoring and a maintainable operations handoff.

We plan the work around your platforms, release requirements and business priorities, with testing and handoff built into delivery.

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