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Mert Serin

@mertserin

iOS engineer at Going Merry, where I lead a team of five and shipped eight consumer apps with shared purchase libraries.

Sweden

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At Going Merry, I lead a team of five iOS developers and architected and shipped eight consumer apps, including apps for AI music generation, camera filters, and AI headshots. I also built shared in-app purchase libraries that standardized integration across the apps.

At Liquid, I built the first iOS app for a decentralized crypto trading platform. Its trading interface supported up to 150x leverage, real-time order management, and instant risk visibility; the app shipped to the App Store.

Earlier, I contributed to SCRL, a photo and video editing app, improving its crash-free user rate from 97% to 99.9%. I’ve also built iOS apps and SDKs across live shopping, banking, energy, and blockchain payments, and developed full-stack personal projects including a dating app and a multiplayer Sudoku game.

Experience

Work history, roles, and key accomplishments

Current

Tech Lead

Current

Going Merry

May 2024 - Present (2 years 5 months)

Lead a team of 5 iOS developers, defining architecture standards, conducting code reviews, and driving sprint planning across the full app portfolio. Architected and shipped 8+ consumer apps spanning AI music generation, camera filters, AI headshot creation, and smart TV remote control.

SwiftUI UIKit Go NodeJS Adapty PostgreSQL Firestore A B Testing

Senior iOS Developer

Liquid

Mar 2025 - Feb 2026 (11 months)

Built the first version of the iOS app for Liquid, a decentralized crypto trading platform backed by a $7.6M seed round led by Paradigm. Delivered a high-performance trading interface supporting up to 150x leverage, real-time order management, and instant risk visibility.

Swift SwiftUI UIKit WebSockets Crypto DeFi REST APIs

Senior iOS Engineer

Appostrophe

Oct 2022 - May 2024 (1 year 7 months)

Core contributor to SCRL, a photo and video editing app generating over $1M in Monthly Recurring Revenue. Improved crash-free user rate from 97% to 99.9%, directly improving retention and App Store ratings.

UIKit RevenueCat NodeJS PostgreSQL Firestore A B Testing

Senior iOS Engineer

Umain AB

Nov 2021 - Oct 2022 (11 months)

Developed and maintained the global McDonald's iOS app, serving 62+ international markets. Led the UI redesign effort, migrating legacy screens to a modern SwiftUI architecture.

SwiftUI UIKit Snapshot Testing Agile Localization

Senior iOS Developer

Bambuser AB

Jan 2021 - Oct 2021 (9 months)

Built and maintained Bambuser's live-shopping iOS app for a NASDAQ-traded company. Created a client-facing SDK distributed via Swift Package Manager, enabling third-party live-shopping integrations.

SwiftUI UIKit Swift Package Manager Bitrise Unit and Snapshot Testing

iOS Engineer

P.F.C. AB

Mar 2020 - Jan 2021 (10 months)

Developed core features for a Swedish neo-banking app: premium subscriptions, family/junior mode, group payments, and savings goals. Collaborated with a team of 4 iOS developers using Coordinator and Observer patterns for clean navigation architecture.

SwiftUI UIKit Bitrise Unit UI Testing Coordinator Pattern Firestore

Senior iOS Developer

Eliq AB

Jun 2019 - Mar 2020 (9 months)

Built the company's first native iOS app from the ground up for a green-tech energy startup. Architected a white-label system driven by configuration files, enabling rapid deployment of branded app variants for utility partners.

UIKit Snapkit Private Pods Unit UI Testing

iOS Engineer

Barakatech

May 2018 - Jun 2019 (1 year 1 month)

Developed MenaPay, the first blockchain-based payment app targeting the MENA region. Integrated the Stellar SDK for iOS to handle on-chain transactions and wallet management.

Swift StellarSDK Snapkit Certificate Pinning API Design

Full-Stack Engineer

Freelance

Dec 2016 - Sep 2018 (1 year 9 months)

Built an on-demand babysitter platform (usit.care) end-to-end: Golang backend with PostgreSQL, real-time location tracking via WebSockets, and a native Swift iOS client. Integrated Onfido for identity verification and PayPal for secure payment processing.

Go PostgreSQL WebSockets Swift Onfido PayPal