Ramiz RajaBook a call
Available for senior + lead mobile work

Mobile software,
shipped on cadence.
Stable, fast, accountable.

I’m Ramiz — a Senior Mobile Developer and Mobile Technical Lead. Twelve years of native Android, iOS, Flutter, and React Native. I inherit unstable mobile codebases, unblock stuck release pipelines, and ship measurable stability and performance wins.

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12+
Years shipping production mobile apps
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10M+
Installs on Unified Remote (Android / iOS)
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10+
B2B flavors of Plume WorkPass shipped
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Maven Central
Published Portal's multi-module crypto SDK
About

A hands-on senior mobile engineer and tech lead for teams that need to ship reliably.

I’ve spent twelve years building mobile apps that go to production — across Android, iOS, Flutter, and React Native — for startups, scale-ups, and well-known consumer brands. My deepest stack is Android, but I’m hands-on across iOS in Swift and cross-platform in Flutter and React Native when the product demands it.

I’m usually called in for one of two reasons: an unstable codebase that needs architecture and stability, or a release pipeline that’s blocking shipping. I take the codebase as I find it, define MVVM and clean-architecture boundaries, lift business logic into a real domain layer, and get crash and ANR rates moving in the right direction release over release.

On the delivery side I rebuild broken CI/CD, automate Play Store internal-testing deployments, and shepherd apps through review — most recently at Carewell, where I built a Flutter pipeline from scratch and shipped to the Play Store, and at Portal, where I unblocked Maven Central publishing for a multi-module Android SDK that consumer apps now pull via standard Gradle dependencies instead of manual binary handoffs.

When the work calls for it, I lead — squads of 4 to 6, PR review discipline, design-system ownership, and the GitHub code-ownership that goes with it.

Services

Where I can help your mobile team.

Six focus areas. They overlap on real projects — most engagements pull from three or four at once.

  • Android app development and rescue

    01

    Build new Android apps and rescue unstable ones. Kotlin, Jetpack Compose, Coroutines/Flow, Hilt, Room, WorkManager — production code that ships.

    • Compose + XML interop
    • MVVM + clean architecture
    • Maven Central publishing

  • iOS app development and release support

    02

    Ship and maintain iOS apps in Swift, SwiftUI, UIKit, and Combine — alongside the Android counterparts so both stores stay in sync.

    • SwiftUI + UIKit
    • App Store deployment
    • Combine + XCTest

  • Cross-platform app delivery

    03

    Flutter and React Native when one team and one codebase fits the product. Riverpod / GetX / GoRouter / Dio on Flutter; app and SDK work on React Native.

    • Riverpod / GetX
    • Design-system parity
    • RN SDK integration

  • Stabilize legacy mobile codebases

    04

    Take over unstable or hard-to-change codebases, set MVVM + clean-architecture boundaries, and get crash and ANR rates moving in the right direction.

    • Module + DI boundaries
    • Testability over cleverness
    • PR review discipline

  • CI/CD and release rescue

    05

    Rebuild broken pipelines, automate Play Store internal-testing deployments, and eliminate manual APK hand-offs to QA.

    • GitHub Actions / Bitbucket Pipelines
    • Play Store + App Store automation
    • Firebase App Distribution

  • SDKs built for smooth third-party integration

    06

    Multi-module SDKs consumed by external teams — clean public APIs, versioned releases, and example apps so client developers can integrate with minimal support from your team.

    • Public API design
    • Versioning + release notes
    • Consumer-developer example apps
Selected work

Apps and SDKs I’ve shipped.

A representative slice — consumer apps, B2B rollouts, and SDKs used by other developers.

More apps

More shipped apps.

Additional production apps I’ve contributed to across Android, iOS, Flutter, and React Native.

Experience

Recent client and team experience.

Most recent first. Companies and clients across Switzerland, the US, the UK, KSA, Lebanon, and Sweden — all remote.

  1. Feb 2026 — Present
    Switzerland · Remote

    Senior Mobile Developer · Carewell

    Flutter app (Android & iOS) for a healthcare workforce marketplace connecting medical institutions with nurses and medical professionals across France, Germany, and Switzerland.

    • Built CI/CD from scratch: rebuilt the broken Android pipeline, created the iOS pipeline from zero, migrated distribution from Firebase App Distribution to Play Store internal-testing, and shepherded the Android app through Play Store review.
    • Ships major features on a 2-week release cadence — multi-slot shift scheduling, core UI refactor, login/logout and work-account flow hardening, app-wide data-loading performance.
  2. Feb 2026 — Present
    Lebanon · Remote · Part-time

    Mobile Lead for AI Integration · SKEDit Software Intl.

    • Restored broken Telegram and WhatsApp scheduling integrations — the app's core value proposition — and resolved multiple message-delivery failure modes.
    • Rebuilt a broken CI/CD pipeline and shipped 10+ production releases in 3 months; automated Play Store internal-testing deployments, eliminating manual APK hand-offs to QA via Slack.
    • Leading a full app redesign and driving team adoption of Claude Code to accelerate dev velocity and design hand-off.
  3. Feb 2025 — Jul 2025
    USA · Remote · Contract

    Lead Mobile Developer · NurivaTech AI

    • Led architecture of SportFX — NurivaTech's AI-powered sports biomechanics Flutter app — defining module structure, dependency injection, and MVVM layer boundaries for maintainability and testability.
    • Designed and enforced a Figma-aligned design system with multi-theme support, keeping UI/UX consistent across the app.
    • Mentored a team of 4 junior developers through PR reviews and pair programming.
  4. Apr 2024 — Apr 2025
    USA · Remote

    Senior Mobile Developer · Portal

    Lead Android SDK developer for an MPC crypto wallet SDK used by Bitso and other clients with millions of monthly active users and multi-million-dollar transaction volumes.

    • Unblocked a long-standing release problem: published the multi-module Android SDK to Maven Central — previously impossible for the in-house team, leaving clients to update via manual binary handoffs on every version. Clients now consume it via standard Gradle dependencies.
    • Contributed to the Portal React Native SDK and built an Android-SDK-powered Flutter integration example app for consumer developers.
  5. Jul 2023 — Dec 2023
    California · Remote · Contract

    Senior Mobile Developer · VegaGem

    • Joined a greenfield codebase; defined MVVM + clean-architecture conventions top-to-bottom; built and shipped the complete user-profile and onboarding stack (Figma → API integration), including session-token management.
  6. Sep 2021 — Feb 2023
    USA · Remote

    Senior Android Engineer · Yahoo Sports

    • Rebuilt critical user-facing screens (contests, lineups) in the Daily Fantasy module of the Yahoo Fantasy Sports Android app.
    • Led the MVP → MVVM refactor, unifying duplicated code across screens by lifting business logic into a dedicated domain layer.
    • Owned stability for Daily Fantasy and later Core Fantasy modules — significantly reduced crash and ANR rates release-over-release using Sentry, Embrace, and QA-filed Jira tickets.
  7. Aug 2020 — Sep 2021
    USA · Remote

    Senior Android Developer · Plume Design, Inc.

    • Key member of the Mobile team shipping Plume's new B2B app, WorkPass, deployed across 10+ business flavors; also shipped features, bug fixes, and performance work on the existing HomePass B2B/B2C app.
    • Led a squad of 4 within a Mobile org of 30+ developers; served as feature owner and GitHub code owner for the Android UI layer — ran PR reviews on a 2-week-sprint Agile cadence under MVVM + clean-architecture guidelines.
  8. Jul 2018 — Aug 2020
    Riyadh, KSA

    Senior Android Developer · Jirah

    • Led a team of 4 shipping two production Android apps — Jirah Sitter and Jirah Parent. Delivered Jirah Sitter from inception to deployment in under 6 months.
    • Took over the unstable Jirah Parent app; eliminated UI jank in under 1 month through targeted profiling and render-pipeline fixes.
    • Established a clean Kotlin codebase (Coroutines, Dagger 2, Retrofit 2, Room, ViewModel, WorkManager, Paging, Navigation); set up Bitbucket Pipelines + Google Play API CI/CD; wrote a custom Chat SDK on top of SendBird used by both apps.
  9. Jun 2017 — Jul 2018
    Sweden · Remote

    Mobile Developer (Android & iOS) · Unified Intents AB — Unified Remote

    • Took over the Unified Remote Android & iOS apps from the outgoing team — 10M+ installs today (1M+ during tenure); upgraded the aging codebase from min API 9 → 14 in under 3 months, removing dead and duplicated code along the way.
    • Eliminated UI jank via GPU and memory profiling and achieved 3× faster live-image rendering by moving bitmap uploads to the GPU on a background thread; brought frame times and memory under Android Vitals limits.
  10. Jun 2013 — Jun 2017
    Remote

    Mobile Developer (Android & iOS) · Chat Sports (USA) & Heya (Finland)

    • Chat Sports: shipped the Android app inception → deployment in under 1 year. Heya: core team on a dating app — real-time chat, user profile, onboarding; post-launch image-download optimization.
Toolkit

Technical depth clients can rely on.

A compact view of the technologies I use to stabilize, ship, and maintain production mobile apps.

Languages
KotlinJavaSwiftDartTypeScript
Android
Jetpack ComposeCoroutines + FlowHilt / DaggerRoomWorkManagerNavigation + PagingRetrofit + OkHttpMVVM + Clean ArchitectureSDK DevelopmentMaven Central publishing
iOS
SwiftSwiftUIUIKitCombineXCTestApp Store deployment
Cross-Platform
FlutterRiverpodGetXGoRouterDioReact Native (app & SDK)
Backend & Tooling
Firebase (Auth, Firestore, Remote Config, FCM, Crashlytics, ML Kit)GitHub ActionsBitbucket PipelinesGoogle Play APIPlay Store internal-testing automationGit
Quality & Stability
Crash + ANR reductionGPU + memory profilingSentry + EmbracePR review disciplineRelease rescue
Education
B.S., Computer Science
University of the Punjab
2009 – 2013 · Gold Medalist
Certifications
  • Google Certified Associate Android Developer
  • Triplebyte Certified Android Engineer
  • Upwork Skill Certification — Android
Open source
opencv-face-recognition-python533 stars343 forksA face-recognition library the community has starred and forked widely.
Contact

Have an app that needs
to ship on time?

Whether it’s a stalled release, an unstable codebase, an SDK that needs to leave your repo, or a new product from zero — I’m happy to take a look. Send a short note about the problem and the team, and I’ll come back with a read on scope and fit.

Book a call

Prefer platform billing? Hire me through Toptal or Upwork.