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Denis – React Native, React, Node.js, experts in Lemon.io

Denis

From Ukraine (GMT+3)

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Mobile DeveloperSenior
Front-end Web DeveloperSenior
Hire developer
6 years of commercial experience
Blockchain
Cryptocurrency
Customer support
Event management
Healthcare
Content creation and licensing
Helpdesk software
Mobile apps
Platforms
Lemon.io stats

Denis – React Native, React, Node.js

Having mastered his React and React Native proficiency while working on business projects, Denys is definitely the developer you don’t want to overlook. The notes of our technical interviewer clearly demonstrate that Denys is a fast learner; he dives deep into the problem and tries his best to resolve it straight away. Moreover, he can work under pressure and still deliver fantastic results. On top of that, Denys was involved in various startups, so he is fully cognizant of process flows, and he passionately wants to be part of the team exploring new business heights.

Main technologies
React Native
3 years
React
4 years
Additional skills
Node.js
Firebase
Cloud Firestore
Firestore
PostgreSQL
Jest
Web 3.0
Sentry
Typescript
GraphQL
AWS
Expo
Docker
Redux Saga
React Query
Google Analytics
Ready to start
ASAP
Direct hire
Potentially possible

Experience Highlights

Senior mobile developer
Jun 2023 - Mar 20249 months
Project Overview

The app offers dozens of Hebrew meditations that can help users deal with anxieties and tensions, sleep better, and be focused. Those who have never practiced meditation can easily learn how to do so and relax.

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Responsibilities:
  • improved app stability and performance
  • reduced bundle size and initial load time
  • redesigned and improved the existing front-end
  • added several new screens and refactored the old codebase
  • added caching mechanisms for images and endpoints
Project Tech stack:
React Native
Redux Saga
React Native CLI
React Query
Front-end / Mobile Developer
Jul 2021 - Aug 20232 years 1 month
Project Overview

The UK’s fastest-growing ticket and booking platform, and it is proven to increase attendance, spending per head, and exposure for anyone in the nightlife industry.

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Responsibilities:
  • fixed bugs and issues in the old mobile app;
  • refactored legacy front-end part;
  • wrote a bunch of unit tests;
  • added new components to the storybook;
  • helped to divide whole app into smaller packages;
Project Tech stack:
React
React Native
React
React Native
Expo
Mobile Developer
Feb 2021 - Jul 20215 months
Project Overview

A mobile app that enables mindfulness teachers to record audio meditations and earn with a direct-to-client subscription.

Skeleton
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Responsibilities:
  • built all UI/UX parts;
  • added firebase;
  • debugged and resolved the application issues;
  • published and updated the app in stores.
Project Tech stack:
React Native
Node.js
Software Engineer
Apr 2020 - Feb 20219 months
Project Overview

The 24/7 remote helpdesk that's here to help businesses achieve operational excellence every day.

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Responsibilities:
  • built an app from scratch;
  • added deep links;
  • wrote unit tests;
  • added and configured firestore/cloud functions;
  • published and updated the app in stores with expo;
Project Tech stack:
React Native
React
Firebase
Cloud Firestore
Firestore
Full-stack developer
Mar 2019 - Apr 20201 year
Project Overview

A mobile application where users can earn crypto.

The features Denys worked on were:

  • watching videos for famous brands and earning even more XP;
  • tracking progress on Leaderboard;
  • the option of expanse being earned with XP;
  • earning rewards faster with the boost timer.
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Responsibilities:
  • created both front-end and back-end parts;
  • created and configurated database and server;
  • published and updated a mobile app;
  • added web3 to communicate with blockchain data.
Project Tech stack:
React Native
Node.js
PostgreSQL

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