Mobile Engineer& Developer

Building high-performance native applications for iGaming, FinTech, and consumer platforms.
7+ years of expertise in Kotlin, Jetpack Compose, and Clean Architecture.

LET'S TALKVIEW WORK
MY SERVICES

Experience

7+ years building scalable Android applications across multiple industries

July 2023 - Present

Senior Android Engineer

Yolo Group

Tallinn, Estonia

  • • Developed large-scale iGaming platform serving 2M+ monthly users
  • • Built real-time gaming features with WebSocket integration
  • • Optimized performance: 40% faster startup, 35% less memory, 99.5% crash-free
  • • Accelerated release cycles by 30% through comprehensive testing & CI/CD
May 2022 - June 2023

Android Engineer

Klar

Berlin, Germany

  • • Built modular banking app serving 500K+ users with SOC 2 compliance
  • • Implemented biometric auth, Android Keystore encryption, certificate pinning
  • • Increased user engagement by 25% with custom Material Design 3 components
  • • Achieved 90% code coverage with comprehensive testing
January 2022 - October 2022

Senior Android Engineer

Moniepoint

Lagos, Nigeria

  • • Architected payment SDK serving 5M+ users, processing $2B+ transactions
  • • Reduced SDK size by 45% through ProGuard optimization
  • • Improved transaction success rate by 18%
  • • Implemented Clean Architecture with MVVM, Coroutines, and PCI-DSS security
January 2021 - February 2022

Lead Android Engineer

Lassod Consulting

Lagos, Nigeria

  • • Led team of 4 Android developers building consumer app (Oyoyo)
  • • Reduced deployment time from 4 hours to 30 minutes with CI/CD
  • • Achieved 85% notification open rate with Firebase integration

Technical Skills

Expert-level proficiency in modern Android development

Languages

KotlinJavaDartSQL

Android

Jetpack ComposeMaterial Design 3Custom ViewsXML Layouts

Architecture

MVVMMVIClean ArchitectureSOLID Principles

Jetpack

NavigationRoomHiltPaging 3WorkManagerLiveData

Async

CoroutinesFlowStateFlowRxJava

Networking

RetrofitOkHttpKtorGraphQLWebSockets

Testing

JUnit 5MockitoEspressoMockKTDD

CI/CD

GitHub ActionsFastlaneGradleFirebase

Security

Android KeystoreBiometric APICertificate PinningEncryption

Let's Work Together

Open to exciting opportunities and collaborations

Josemaria Abah

About Me

Hi, I'm Josemaria Abah

Senior Android Engineer with 7+ years of building native high-performance Android applications for iGaming, FinTech, and consumer platforms. Expert in Kotlin, Java, Jetpack Compose, MVVM, Clean Architecture, Coroutines, RxJava, and Dagger/Hilt.

Proven track record in providing scalable apps that serve 5M+ users with 99.9% uptime and 4.5-star Play Store ratings. Strong expertise in CI/CD automation, comprehensive testing strategies, and cross-platform development.

Tallinn, Estonia
hello@abahnj.dev

© 2025 Josemaria Abah. All rights reserved.