Alex Sheiko

Experience

1. HotShots Labs OÜ

   Tallinn, Estonia

   Staff Mobile Engineer Jul 2025 – Present
   Senior Mobile Engineer Mar 2024 – Jul 2025
   • Led end-to-end technical architecture across all client projects, including feasibility research, stack selection, and team-wide knowledge sharing on best practices.
   • Mentored mid-level mobile developers across multiple concurrent projects, conducting code reviews and supporting growth in architectural thinking and mobile architecture patterns.
   • Introduced AI-assisted development workflows across the team: adopted Cursor for code generation, set up AI-driven test case authoring and maintenance, integrated CodeRabbit for automated code review, and used AI assistance for writing technical specs, while continuously evaluating emerging tools to stay current.
   • Developed 3 client products: an IoT sleep mask companion app (SnoozeBand), a mobile logistics platform for delivery drivers (Deed Driver), and an on-demand task marketplace (SmartTasker).
   • Architected BLE communication layer for SnoozeBand, enabling reliable device pairing, real-time LED and audio control, and session scheduling for a Bluetooth-connected sleep mask that reached 10,000 users within weeks of launch.
   Technologies: Mobile SDKs, MVVM, Supabase, Firebase (Crashlytics, FCM, Analytics), RevenueCat, Bluetooth/BLE

2. Cashews Finance LLC

   Atlanta, GA

   Senior Mobile Engineer Aug 2022 – Feb 2024
   • Developed cross-platform iOS and Android personal finance application for Cashews, a subscription-based budgeting app connecting to thousands of financial institutions via bank account aggregation.
   • Integrated read-only bank account aggregation for automated transaction ingestion and real-time spendable balance calculation across linked accounts.
   • Built a recurring expense detection engine that classified transactions by recurrence cycle (weekly, bi-weekly, monthly, quarterly, annual), removing the need for manual categorization.
   • Implemented cashflow visualization dashboards rendering 12-month income and spending trend graphs that increased user session duration by 28%.
   Technologies: Mobile SDKs, Plaid API, Auth0, MVVM, Lottie

3. HitPay Payment Solutions Pte Ltd

   Singapore

   Mobile Engineer May 2019 – Jul 2022
   • Led an incremental refactor toward modular MVVM architecture with a shared abstraction layer for payment providers, allowing new payment methods to be added without duplicating logic across iOS and Android.
   • Introduced automated UI and integration tests around critical payment paths, cutting regression testing time by 40% per release cycle.
   Technologies: Swift, Kotlin, iOS SDK, Android SDK, MVVM, Stripe SDK, NFC, UI/integration testing

4. StrangeLogic LTD

   London, UK

   Mobile Engineer Feb 2018 – Apr 2019
   • Engineered mobile SDK for Proxyrack's peer-node monetization infrastructure, enabling third-party app publishers to generate passive revenue by contributing users' idle device bandwidth to a residential proxy network.
   Technologies: Kotlin, Mobile SDKs, RxJava, jmDNS, PermissionsDispatcher, JUnit

5. Real Brokerage Inc

   Newark, CA

   Software Engineer, Mobile Mar 2015 – Jan 2018
   • Built MLS-connected property search and listing features with map integration, giving agents a way to discover, filter, and share active listings directly from the app.
   Technologies: Java, Mobile SDKs, Google Maps API, SQLite

6. BlazePod Inc

   Miami, FL

   Junior Mobile Developer Sep 2014 – Feb 2015
   • Contributed to mobile companion application for BlazePod, a Bluetooth-connected reaction light training system used by elite organizations including Arsenal, FC Bayern München, and the UFC Performance Institute.
   Technologies: Mobile SDKs, Bluetooth Low Energy (BLE), GATT, REST APIs, Git

Skills

Featured Work