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Deividas Vasilevskis

@deividasvasilevskis

Mobile engineer at CheckBonus who developed its receipt-scanning cashback app and bonus features for earning and withdrawing rewards.

Lithuania

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At CheckBonus, I designed and developed a cashback app where users earn bonuses by scanning fiscal receipts. I built the receipt-scanning flow, partner catalogue, referrals, and bonus withdrawal experience, and integrated push notifications, analytics, and OTA updates.

At PlayRewards, I developed a rewards app and its NestJS API, including a personalized game catalogue, real-time referral statistics, and bonus-to-cash exchange. I also developed NeoCoin’s Telegram Mini App and worked on UWords, a cross-platform language-learning app concept and marketing site.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

CheckBonus

Aug 2025 - Present (1 year 2 months)

Designed and developed a cashback mobile app using Expo/React Native, implementing QR scanning, guest-first auth, partner card catalogue, referral flows, daily bonus systems, and multi-step bonus withdrawal. Integrated push notifications, analytics, and OTA updates.

React React Native Expo TypeScript Redux Redux RTK Query Tailwind Feature Sliced Design QR Scanning Authentication Push Notifications AppMetrica OTA Updates

Full Stack Engineer

PlayRewards

Jan 2025 - Aug 2025 (7 months)

Designed and developed a reward-based mobile app using FSD architecture, built a NestJS API with Prisma/MySQL, Redis, JWT auth, and Socket.IO gateways. Implemented personalized game catalog, referral system, leaderboards, bonus-to-cash exchange, and daily tasks system.

React React Native Expo TypeScript Redux toolkit Redux RTK Query React Navigation Gluestack UI Nativewind Tailwind React Native Reanimated Socket.IO NestJS Prisma MySQL Redis JWT WebSockets

Frontend Developer

UWords

May 2025 - Jul 2025 (2 months)

Built a Next.js marketing site and a cross-platform language learning app concept, implementing JWT auth, 2FA, onboarding, dictionary module, TTS, and interactive mini-games.

React React Native Expo TypeScript Zustand Gluestack UI Tailwind lottie React Native Reanimated Next.js JWT 2FA TTS

Software Engineer

NeoCoin

Feb 2024 - Jan 2025 (11 months)

Designed and developed a Telegram Mini App for tap-to-earn coin mining, implementing optimistic taps, i18n, dual auth, onboarding, daily streaks, referral flows, accelerator shop, and analytics integration.