Senior Android Developer · Vilnius, Lithuania

Armaan Mollah

7 years building Android apps — from award-winning university projects to production fintech platforms trusted by 50,000+ customers

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Years Android

Years at PayAlly

0k+

Customers Reached

9:41 📶 🔋

Good morning Armaan 👋

8,432 steps

420 kcal

3.2 km

48 bpm

Weekly Activity

🔔 Notifications

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Payment Sent €2,400 · SEPA Transfer

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KYC Verified Identity confirmed

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5-star review "Best Android dev on Fiverr"

About Me

The Android engineer who ships and delivers

I'm Armaan — a Senior Android Developer and Independent Consultant based in Vilnius, Lithuania. Over 7 years I've grown from writing my first lines of Java to architecting a production fintech platform that 50,000+ real customers rely on every day. I've lived through the full evolution of Android: Java → Kotlin, XML Views → Jetpack Compose, RxJava/LiveData → Coroutines/StateFlow.

At PayAlly Global I'm the sole Android engineer — I designed, built, and shipped a full EMI banking app from a blank canvas. Payment cards, multi-currency accounts, SEPA transfers, KYC, real-time messaging, SIP VoIP, Google Pay — all secured with AES-256-GCM, HMAC-SHA256, Android KeyStore, and Google Play Integrity API. That's what I deliver when trusted to own a product end-to-end.

Alongside PayAlly, I work as an Independent Consultant — Android Developer for international clients — advising on architecture, delivering production apps, and solving complex Android problems. I've also worked within engineering teams at Digimeglobal and Accenture. Whether leading solo or embedded in your team, I adapt and perform.

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Fintech & Security AES-256, HMAC, KeyStore, Biometric, Play Integrity

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Solo or Team — Equally Strong Led solo at PayAlly, collaborated at Digimeglobal & Accenture

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Award-winning Best project at KTU (10/10) & Accenture Bootcamp

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50,000+ Users Real customers across PayAlly & consulting engagements

Technical Skills

What I work with

Languages & UI

Kotlin95%

Jetpack Compose + Material 392%

Java85%

Architecture & Jetpack

Clean Arch / MVVM / MVI Store93%

Coroutines + StateFlow92%

Room + SQLCipher90%

Security & Fintech

AES-256-GCM / HMAC-SHA25690%

Android KeyStore + BiometricPrompt88%

Google Play Integrity API85%

Integrations & Tools

Retrofit + OkHttp92%

Hilt DI90%

Firebase (Crashlytics, FCM, Analytics)88%

Compose Destinations WorkManager CameraX + ML Kit Google Pay / Tap & Pay SumSub KYC ABTO VoIP SDK Baseline Profiles Gradle Version Catalogs KSP RxJava LiveData DataStore Spring Boot Git / GitHub

Experience

My journey so far

Feb 2023 – Present Current

Senior Android Developer

PayAlly Global · Vilnius, Lithuania

Sole Android engineer — built a production fintech/EMI banking app from scratch. The app covers payment cards, multi-currency accounts, SEPA transfers, KYC onboarding, real-time messaging, and SIP-based VoIP calling. Implemented enterprise-grade security: AES-256-GCM encrypted API requests, HMAC-SHA256 signing, Android KeyStore, BiometricPrompt, runtime tamper detection, and Google Play Integrity API. Managed 83 Room + SQLCipher migrations without data loss.

KotlinJetpack ComposeClean ArchHiltRoom + SQLCipherStateFlowGoogle PaySumSub KYCABTO VoIP

May 2019 – Present

Independent Consultant — Android Developer

Self-employed · International clients

Consulting independently for international clients — advising on architecture, delivering production apps, and solving complex Android challenges. Projects include a crypto price display app (RxJava), a nutrition tracking app (Room, LiveData), and a health & medical records app with encrypted storage. Also led Java→Kotlin and XML→Jetpack Compose migrations. Combined reach: 50,000+ users.

KotlinJavaRxJavaRoomMVVMRetrofit

Nov 2022 – Dec 2022 🏆 Best Project

Java Bootcamp — Best Project Award

Accenture

Intensive Java bootcamp culminating in Event Buddy — a full-stack social event application. Awarded best project dissertation. Built with Java 17, Spring Boot 3, Spring MVC, Spring Data JPA, JUnit 5, Thymeleaf, and Bootstrap in an Agile team workflow.

Java 17Spring Boot 3Spring MVCJUnit 5Agile

Apr 2021 – Jul 2021

Android Developer Intern

Digimeglobal

First professional Android role. Contributed to feature development, bug fixes, and learned production-grade workflows in a professional team environment.

JavaAndroid SDKGit

2017 – 2022 🏆 Grade 10/10

Bachelor's in Informatics, Information Technology

Kaunas University of Technology · Grade 8.4/10

Best Final Bachelor Project in the Informatics department (grade 10/10) — LaundryWala, an Android laundry marketplace with live delivery tracking, multi-role Firebase Auth, Cloud Firestore, Google Maps SDK, Places API, and MVVM. Recommended by the university to pitch at Technorama 2022. Also served as Vice President and Social Inclusion Co-ordinator at Erasmus Student Network Lithuania.

JavaFirebaseGoogle Maps SDKMVVMFirestore

Projects

Things I've built

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PayAlly — Fintech Banking App

Production EMI banking app built from scratch as the sole Android engineer. Covers payment cards, multi-currency accounts, SEPA transfers, KYC (SumSub), real-time messaging, SIP VoIP calling, and Google Pay integration. Enterprise security: AES-256-GCM, HMAC-SHA256, Android KeyStore, BiometricPrompt, Play Integrity API, and runtime tamper detection. 83 Room + SQLCipher migrations managed without data loss.

KotlinJetpack ComposeMaterial 3Clean ArchHiltRoom + SQLCipherStateFlowGoogle PayCameraX + ML KitBaseline Profiles

LaundryWala

Android laundry marketplace with live delivery tracking, multi-role authentication, and real-time order management. Best Final Bachelor Project at KTU (grade 10/10). Recommended to pitch at Technorama 2022.

JavaFirebase AuthCloud FirestoreGoogle Maps SDKPlaces APIMVVM

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Crypto Price Tracker

Freelance project — real-time cryptocurrency price display app with live market data feeds, portfolio tracking, and reactive UI updates.

KotlinRxJavaRetrofitMVVM

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Event Buddy

Full-stack social event app built at the Accenture Java Bootcamp. Won best project dissertation award. Users can create, discover, and join local events with a clean web interface.

Java 17Spring Boot 3Spring Data JPAThymeleafJUnit 5

What I Offer

How I can help you

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End-to-End App Development

I've built a full production banking app solo and delivered numerous consulting projects for international clients. You get a complete, production-ready app — not a prototype handed off mid-way.

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Fintech & Security Engineering

AES-256-GCM, HMAC signing, Android KeyStore, BiometricPrompt, Play Integrity API, runtime tamper detection. I build apps that handle sensitive financial data the right way.

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Jetpack Compose UI

Pixel-perfect Material 3 interfaces with smooth animations, adaptive layouts, and accessible components — built the modern way. No XML, no compromise.

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Legacy Modernisation

Java→Kotlin migrations, XML Views→Jetpack Compose rewrites, RxJava→Coroutines/StateFlow upgrades. Done for multiple consulting clients and in-house — without breaking production.

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Complex Integrations

Google Pay, KYC (SumSub), VoIP (SIP/ABTO), Firebase, REST APIs, CameraX + ML Kit. I've integrated all of these in live, customer-facing apps.

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Team or Solo — I Deliver Either Way

I've led engineering solo at PayAlly, collaborated in Agile teams at Accenture and Digimeglobal, and consulted independently for international clients. I adapt to what your situation demands and get the job done.

FAQ

Questions I get all the time

Kotlin-first, always. For UI I use Jetpack Compose with Material 3. Architecture is Clean Architecture with MVVM and an MVI-inspired Store pattern for state management. Dependency injection with Hilt, async with Coroutines + StateFlow, local persistence with Room (+ SQLCipher for sensitive data), and networking with Retrofit + OkHttp.

Yes — that's exactly what I did at PayAlly Global. I was the sole Android engineer and built the entire production banking app from a blank project to Play Store, covering UI, architecture, security, backend integration, and deployment. I've also delivered end-to-end apps independently for multiple consulting clients.

Absolutely. I started on Java and have led multiple Java→Kotlin migrations and XML Views→Jetpack Compose rewrites for clients. I know where the pain points are and how to modernise incrementally without breaking what's already working in production.

Security is something I've implemented at a fintech level — AES-256-GCM encrypted API requests, HMAC-SHA256 request signing, Android KeyStore for key storage, BiometricPrompt for authentication, runtime tamper detection, and Google Play Integrity API. For data at rest I use SQLCipher on top of Room. I treat security as a first-class requirement, not an afterthought.

Yes. I'm available for consulting engagements, short-term contracts, and advisory work. I work with international clients directly and remotely. I'm based in Vilnius, Lithuania — reach out via the contact form or LinkedIn and let's talk about what you need.

Performance is built in from the start, not bolted on at the end. I use Baseline Profiles to speed up app startup, Kotlin Coroutines to keep the main thread free, Paging 3 for large lists, and I regularly profile with Android Studio's tools to catch memory leaks and jank. I've shipped apps that serve 50,000+ users where performance directly impacts user trust.

Yes — I've integrated Google Pay / Tap & Pay, SumSub KYC, ABTO VoIP SDK, Firebase (Crashlytics, FCM, Analytics), CameraX + ML Kit, and various REST APIs. If you need a specific SDK integrated cleanly into your architecture, I've likely done something similar before.