Gábor Berényi

IOS Engineer

Penn Valley, California, United States12 yrs 8 mos experience

Most Likely To SwitchHighly Stable

Key Highlights

Led development of award-winning fintech apps.
Founded AI guild to enhance developer experience.
Expert in Kotlin and Android development.

Stackforce AI infers this person is a Fintech expert with a strong focus on Android development and AI integration.

Contact

Skills

Core Skills

KotlinAndroid DevelopmentAi Development

Other Skills

Jetpack ComposeGraphQLMobile Application DevelopmentMCPCopilot SDKAndroid SDKML KitCoroutinesDagger (Software)Model-view-viewmodel (MVVM)compose multiplatformkotlin multiplatformAndroidMobile ApplicationsJava

About

I’m a Staff/Principal Android engineer with 10+ years building digital banking and payments experiences at American Express and Jenius Bank (SMBC Manubank). I design and lead Kotlin, Jetpack Compose, and KMP architectures that ship reliably at scale, with a focus on performance, safety, and developer efficiency. I’m currently looking for Staff/Principal Android or Mobile Platform roles in fintech (my main domain but open to any other) — ideally remote in the US or hybrid in the SF Bay Area.

Experience

12 yrs 8 mos

Total Experience

2 yrs 6 mos

Average Tenure

4 yrs 6 mos

Current Experience

Smbc manubank

Principal Engineer - Android

Nov 2021 – Present · 4 yrs 6 mos · California, United States · Remote

Led Android development for Jenius Bank from zero to launch, building a 100% Kotlin + Jetpack Compose digital banking app.
Partnered with backend engineers to define and shape mobile‑optimized GraphQL API contracts, ensuring data shapes, pagination patterns, and error handling were designed for the mobile client from the start.
Owned end‑to‑end flows for secure login, account details, transfers, mobile check deposit, and managing/aggregating external accounts to surface insights and facilitate transfers.
Designed a multi‑module architecture with clear api/impl/mock boundaries and an app‑level injector to maximize testability and iteration speed.
Built internal tooling including a robot‑pattern Kotlin DSL for regression and a debug drawer for runtime inspection and feature flags.
Implemented an M3‑based design system and component browser shared with design and iOS, ensuring consistency across platforms.
Founded and led a company‑wide AI guild, using MCP and the Copilot SDK to standardize AI‑assisted development patterns and improve developer experience across teams.
Advised leadership on technical strategy, roadmaps, solution architecture, and process improvements; drove ~20 successful production releases.
Led hiring and mentored Android engineers; shaped team culture and engineering standards.
Result: Android became the most engaged channel, with user interaction over 4× higher than web and near 5‑star ratings for ease of use.

KotlinJetpack ComposeGraphQLAI DevelopmentMobile Application DevelopmentAndroid Development

American express

Senior Engineer

Mar 2019 – Nov 2021 · 2 yrs 8 mos · US remote

Tech lead on the Mobile Platform team, owning shared internal Kotlin and Android SDKs and developer tooling adopted across multiple Amex apps.
Led large-scale architectural efforts for Amex's flagship credit card apps — a J.D. Power award winner in the U.S. credit card app category — serving 2M+ monthly active users in the US and deployed across 22 countries.
Defined architectural vision and standards for Android; authored influential internal engineering blog posts that shaped platform-wide practices.
Drove greenfield development and adoption of cutting-edge tech — including Jetpack Compose, ML Kit, and Coroutines — across teams with a historically RxJava/legacy stack.
Built and maintained a design system and developer tooling that improved consistency and velocity across Android teams.
Mentored engineers, contributed to hiring, and collaborated cross-functionally on internal SDK design and platform strategy.

KotlinAndroid SDKJetpack ComposeML KitCoroutinesAndroid Development