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Vasyl – Node.js, PostgreSQL, MongoDB, experts in Lemon.io

Vasyl

From Ukraine (UTC+3)

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Back-end Web DeveloperSenior
14 years of commercial experience
Accounting
Administration
Blockchain
Cryptocurrency
Entertainment
Food production
Govtech
Information services
IoT
Logistics
Retail
Sports
Telecommunications
Collaboration tools
Mobile apps
Platforms
POS systems
Software development
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Vasyl – Node.js, PostgreSQL, MongoDB

A bold master of code and a talented back-end developer, Vasyl is a quiet genius whose modesty belies his profound confidence in his skills. With deep experience in Node.js and mastery of frameworks, he demonstrates an impressive ability to tackle tasks even in the most challenging situations. His capacity to adapt quickly and work both collaboratively and independently makes him a valuable asset for any project. Even in interpersonal interactions, he proves to be adept, facilitating high-quality and productive exchanges of ideas.

Main technologies
Node.js
9 years
PostgreSQL
4 years
MongoDB
4 years
Additional skills
Docker
Express.js
Koa.js
Microsoft SQL Server
Microsoft Azure
AWS
Angular JS
API
Backbone.js
Nest.js
Ready to start
ASAP
Direct hire
Potentially possible
Ready to get matched with vetted developers fast?
Let’s get started today!

Experience Highlights

Senior back-end developer
Sep 2022 - Feb 20252 years 5 months
Project Overview

Platform providing web and mobile applications for interacting with multi- chain cryptocurrencies and NFTs

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Responsibilities:
  • Contributed to breaking a monolithic service into microservices.
  • Developed a transaction service with an admin panel to interact with the EVM blockchains and manage transaction statuses.
  • Integrated the Moralis API for handling NFT data.
  • Built a coin service to manage cryptocurrency historical data and account balances, integrating CoinGecko API and QuickNode API.
  • Contributed to services related to the Invisible Wallet functionality.
  • Implemented login functionality via Apple OAuth.
  • Built an auth library for JWT verification and published it via GitHub Packages.
  • Integrated linting tools and static application security testing (SAST) tools into the CI/CD pipeline.
Project Tech stack:
Node.js
Express.js
RabbitMQ
PostgreSQL
MongoDB
Redis
AWS
GitHub Actions
Payload CMS
Ethers.js
Senior Back-End Web Developer
Jan 2021 - Mar 20221 year 2 months
Project Overview

An application that collects and aggregates information about companies. It searches companies' information in several vendors, merges it, and allows to generate reports with company profiles and its member's data. Know Your Business (KYB) service.

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Responsibilities:
  • Developed core part of the application;
  • Developed API to generate PDF, ZIP files;
  • Integrated telemetry services;
  • Developed pages to show company-related information;
  • Released application versions.
Project Tech stack:
Node.js
Nest.js
MongoDB
Docker
AWS
Senior Back-End Web Developer
Nov 2017 - Dec 20203 years 1 month
Project Overview

A collaboration platform that allowed organizations to manage their documents and interact with customers and government services.

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Responsibilities:
  • Designed, developed, documented, and supported new microservices;
  • Tested and troubleshot the application;
  • Transferred functionality from .NET monolith server application to Node.js microservices;
  • Developed application for generating microservices scaffold;
  • Integrated third-party services;
  • Updated CI/CD flows;
  • Released platform versions;
  • Mentored team members.
Project Tech stack:
Node.js
Koa.js
Microsoft SQL Server
Docker
Microsoft Azure
Express.js
Senior Back-End Developer
Jul 2017 - Nov 20173 months
Project Overview

The system serves butcher shops and other produce stores. It has a webshop platform that allows configuring online ordering. It has an order kiosk that helps customers easily and quickly enter their orders in a store. It has software for the configuration and generation of bar codes. Also, it has a dashboard for handling charges, customers, etc.

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Responsibilities:
  • Developed core part of the new version;
  • Integrated Zebra printer;
  • Implemented service for handling barcodes structure (via ZPL language).
Project Tech stack:
Node.js
PostgreSQL
AWS
ZPL
Express.js
Back-End Web Developer
Jul 2016 - Jul 20171 year
Project Overview

The platform provides a game where participants assemble virtual teams composed of proxies of real players of professional soccer leagues. These teams compete based on the statistical performance of those players in actual games.

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Responsibilities:
  • Developed back-end features;
  • Developed Twitter bot;
  • Developed admin panel features on front-end and back-end;
  • Integrated monitoring system with Slack bot.
Project Tech stack:
Node.js
MongoDB
AWS
Express.js
Angular JS
Back-End Web Developer
Nov 2015 - Jul 20168 months
Project Overview

The platform helps businesses customize a last-mile delivery solution to provide the best service to their customers. On the other hand, it helps the courier community to grow their business by picking up shifts, scheduled jobs, or on-demand deliveries.

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Responsibilities:
  • Developed microservices for mobile API;
  • Developed microservice for bundling orders in shift run (estimate and bundle food orders into driver routes);
  • Developed microservice for providing external API usage;
  • Implemented integration with Google Directions API.
Project Tech stack:
Node.js
MongoDB
Express.js
Tech lead, Back-End Web Developer
May 2015 - Nov 20156 months
Project Overview

Mobile application that interactively provides the leading services in order to ease the life of Telecommunications Regulatory Authority customers.

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Responsibilities:
  • Developed core part of the system;
  • Developed mobile API;
  • Integrated with Microsoft Dynamics CRM;
  • Set proxy library on C#;
  • Developed markup meta-language for mobile dynamic views;
  • Developed admin panel;
  • Released application.
Project Tech stack:
Node.js
MongoDB
.NET
Express.js
Back-End Web developer
Oct 2014 - May 20157 months
Project Overview

Mobile application that provides kinds of games that are based on beacons and connected to mall stores. It allows you to accumulate loyalty points, find great deals, redeem awesome prizes, and participate in fantastic competitions.

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Responsibilities:
  • Developed core part of the system;
  • Developed mobile API;
  • Developed admin panel;
  • Developed a points system to receive and redeem prizes;
  • Implemented integration with beacons.
Project Tech stack:
Node.js
PostgreSQL
Backbone.js
AWS
Express.js

Education

2012
Computer Systems and Networks
Master degree

Languages

English
Advanced

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