Martin Rajniak – Senior Mobile Engineer

Experienced Mobile Developer with 10+ years of delivering robust Android and iOS apps. Specialising in CI/CD, Kotlin Multiplatform, and cross-platform architecture. Proven leadership in mobile engineering, with recent focus on machine learning using TensorFlow and Google Cloud.

Experience

iOS Senior Engineering Manager Nov 2022 – Oct 2024

Gen Digital (Avast) · Remote, Slovakia

Directed 4 iOS teams to deliver strategic cross-functional mobile solutions
Drove a cross-departmental CI/CD initiative to overcome post-merger integration barriers
Led an initiative to improve cross-departmental collaboration focused on the Design System
Co-led a KMP workshop at a dev conference, expanding the team hiring pipeline

Principal Software Engineer Mar 2022 – Nov 2022

Avast Software · Remote, Slovakia

Built and integrated Kotlin Multiplatform libraries in production iOS apps
Drove the initiative to increase KMP adoption using working groups and production data

Lead Mobile Developer Jan 2018 – Mar 2022

Avast Software · Prague, Czechia

Led Android and iOS teams to develop VPN mobile clients
Applied Continuous Delivery practices to cut release cycles from bi-monthly to bi-weekly
Maintained client library for Google Play's Billing System
As a domain expert, helped ML experts build a solution to identify a suspicious release

Lead Android Developer Nov 2016 – Jan 2018

Avast Software · Prague, Czechia

Rebuilt legacy Alarm Clock app, boosting ad revenue via A/B-tested placements
As an acting product manager, spearheaded redesign based on analytics data and feedback

Senior Android Developer Sep 2015 – Nov 2016

Avast Software · Prague, Czechia

Worked on file cleanup, password management, serving ads and remote configuration

Android Developer Jun 2012 – Aug 2015

Foundation, s.r.o. · Bratislava, Slovakia

Created Android client for cloud backup service (Soonr) and integrated C++ sync agent via JNI

Technical Skills

Mobile

Android · iOS
Kotlin · Swift
Jetpack Compose
Kotlin Multiplatform

DevOps

CI/CD · Gradle
GitHub Actions
Fastlane
Docker

Leadership

Team Management
Cross-functional
A/B Testing
Performance & Monetization

Key Highlights

CI/CD Transformation

Cut release cycles from bi-monthly to bi-weekly with Continuous Delivery practices
Drove cross-departmental CI/CD initiative post-merger at Gen Digital

CI/CDFastlaneGitHub Actions

Kotlin Multiplatform Adoption

Built and shipped KMP libraries in production iOS apps
Drove org-wide adoption through working groups and production data
Co-led KMP workshop at developer conference

KMPKotliniOSAndroid

Product & Monetization

Boosted ad revenue via A/B-tested placements in Alarm Clock app
Maintained Google Play Billing System client library

A/B TestingBillingAnalytics

Education

MSc Economic Informatics – Univ. of Economics, Bratislava 2007–2012

Thesis at Luleå University of Technology, Sweden Exchange