Gabriel Marwa Mahando

Senior mobile engineering · product operations · automation

Android, Flutter & Full‑Stack Engineering for Products Built to Scale

I’m Gabriel Marwa Mahando. I build, launch, monetize and operate production mobile products—from application architecture and media systems to backend infrastructure and automated Google Play releases.

8+ years of practical experience 21 Android apps built and managed 16 of 16 parallel releases completed
Discuss a Role or Product Explore the App Portfolio

Vision · product ownership · execution

Engineering products that remove barriers and earn trust.

My Bible products begin with a clear conviction: Scripture belongs to everyone. That means multilingual access, offline-first design, understandable interfaces and media that works reliably. The same discipline shapes every product I build—solve the real problem, engineer the full system and keep complexity away from the user.

Vision

Make Scripture clear and accessible—online or offline, wherever the reader may be.

Ownership

Own the lifecycle from architecture through monetization, release and continuous improvement.

Engineering standard

Build for performance, correctness, long-term maintainability and a calm user experience.

How I create value

I don’t just develop mobile apps. I operate mobile products.

I take responsibility across the complete lifecycle: evaluating an existing application, designing scalable architecture, shipping features, integrating monetization and analytics, managing APIs and infrastructure, automating releases, diagnosing production problems and improving the product after launch.

BuildAndroid, Flutter, responsive interfaces and reusable multi-app architecture
MonetizeAdMob, Google Play Billing, subscriptions and server-side validation
OperateAnalytics, production servers, APIs, databases, logs and release management
ImproveReliability, performance, store readiness, automation and product economics

Core capabilities

One engineer across the product, platform and operation.

This range reduces handoffs and makes it easier to understand an app as both a technical system and a business asset.

01

Android & Flutter Engineering

Native Android, Kotlin, Java, Flutter, Dart, responsive interfaces, offline-first architecture and reusable multi-app foundations.

02

Monetization & Product Growth

AdMob, Google Play Billing, subscriptions, analytics, store optimization and product decisions informed by retention and revenue.

03

Release & Workflow Automation

Python, Bash, Google Play Publisher API, Google Apps Script, data pipelines and repeatable portfolio-wide operations.

04

Backend & Infrastructure

REST APIs, OAuth, Python, Node.js, PHP, Java, SQL, Firebase, Redis, Linux VPS, Apache, Nginx and production troubleshooting.

05

Audio, Video & Offline Systems

ExoPlayer, MP3, HLS, MP4, background playback, downloads, caching, signed media URLs and resilient error handling.

06

Technical Due Diligence

Codebase quality, architecture, debt, security, subscriptions, analytics, performance, store-policy risk and maintenance cost.

Selected work · systems · outcomes

Products I have built, shipped and operated.

These are not isolated interface exercises. Each project combines product judgement, engineering execution and the operational work required to move from an idea to a dependable release.

21 Android products built and managed across a multilingual app portfolio
16 / 16 Parallel Android App Bundle releases completed successfully in one production run
100K+ Public installs recorded for All Bible Versions Offline
Mobile product Kuria Audio Bible application icon

Android · Flutter · offline media

Kuria Audio Bible – Offline

A production Bible and audio product for Kuria-speaking readers, combining Kuria Scripture with English and Swahili support, offline access, native audio, search, bookmarks, notes and dependable in-app navigation.

Offline-firstAudio playbackPlay operations
Explore the product
Published product All Bible Versions Offline application icon

Flutter · Firebase · multilingual

All Bible Versions Offline

A multilingual Bible product designed for uninterrupted reading, with offline access, search, highlights, bookmarks, notes and sharing. Product decisions span the interface, local data, release quality and continued store operation.

100K+ installsOffline readingProduct lifecycle
View on Google Play
Release infrastructure
Production release run 16 / 16 AAB validation, upload, track assignment and structured reporting completed successfully.

Python · Google Play API · automation

Automated Google Play Publishing System

A release-management system built to operate an Android portfolio reliably. It handles service-account authentication, Google Play edits, bundle uploads, track assignment, validation, parallel execution and machine-readable reports.

Parallel releasesValidationJSON reporting
Discuss release automation
Source content flowing through an automation pipeline into a live Android application

Reusable product system

YouTube to Android App Generator

A reusable workflow that turns a channel and its content structure into a branded Android experience with organized playlists, notifications and monetization-ready foundations. The emphasis is repeatability, maintainability and a clear viewer journey.

Reusable architectureContent deliveryNotifications
Discuss a content product
Google data automation dashboard workflow

Operational intelligence

Google Data Automation

A workflow connecting Google Analytics and Search Console with Sheets, then cleaning and synchronizing records into practical dashboards. It replaces repetitive manual reporting with structured data that is easier to review and act on.

Data pipelinesApps ScriptDashboards
Discuss workflow automation
Mobile and web payment integration

Commerce infrastructure

Payment and API Integrations

End-to-end integration work across mobile and web, including API connectivity, request validation, transaction state, user feedback and failure handling. Experience includes payment flows involving PayPal, Flutterwave, Selcom and Stripe.

API integrationFailure handlingMobile & web
Discuss an integration

Project · brand · content notice

Clear context for the work shown here.

This portfolio describes selected products, systems and delivery outcomes so visitors can understand the nature of my work. It does not transfer third-party rights or replace the terms attached to an individual product or service.

Read the full website disclaimer

Portfolio scope and accuracy

Descriptions and figures reflect the project information available when this page was updated. They are presented as evidence of engineering work, not as a promise that every feature or metric will remain unchanged.

Third-party names and services

Google Play, Android, Flutter, Firebase, YouTube and other names or marks belong to their respective owners. Their appearance identifies tools, platforms or integrations and does not imply sponsorship or endorsement.

Scripture, audio and media rights

Bible translations, recordings and other licensed materials remain subject to the rights and permissions of their publishers or licensors. Product pages and in-app notices provide the context relevant to each application.

No professional guarantee

Website content is general portfolio information, not legal, financial or other professional advice. Any client engagement, scope, delivery commitment or commercial term must be agreed separately in writing.

Work with me · remote · international

Need an engineer who can own the product beyond the codebase?

I work across Android, Flutter, monetization, release automation, backend services and production infrastructure. That range is useful when a product needs one accountable technical owner who can evaluate the system, improve it and carry the work through release and operation.

Share the product, the current constraint and the outcome you need. I can help with a focused technical review, an existing product that needs stronger ownership, or a complete build-and-operate engagement.

Start a conversation on WhatsApp Call +255 754 777 754 Email support@mahando.com

Based in Tanzania · Available for remote product engineering, automation and technical due diligence.