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Oleksandr – React, Node.js, Gatsby.js, experts in Lemon.io

Oleksandr

From Poland (UTC+2)

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Full-stack Web DeveloperSenior
9 years of commercial experience
Administration
AI
Analytics
Banking
Blockchain
Climate tech
Data analytics
Design
Fashion
Fintech
Logistics
Manufacturing
NFT
Open source
CRM
Lemon.io stats
2
projects done
1077
hours worked
Open
to new offers

Oleksandr – React, Node.js, Gatsby.js

Oleksandr is a proactive and business-oriented senior full-stack developer with over 7 years of commercial experience. He demonstrates exceptional soft skills in project management, teamwork, communication, adaptability, and leadership, crucial for startup success. Possessing extensive technical expertise in React, Node.js, TypeScript, and various backend architectures, including monolith, microservices, and serverless, Oleksandr also has some experience in UI/UX design. Moreover, he is an experienced mentor who has created a mini-course to guide a group of students from scratch to become junior web developers.

Main technologies
React
6 years
Node.js
7 years
Gatsby.js
3 years
Typescript
6 years
Next.js
2 years
AWS
3 years
Additional skills
Flutter
Prisma
Firebase
PostgreSQL
React Native
REST API
Angular
MongoDB
OpenAI
Rust
JavaScript
npm
OAuth
Microsoft Azure
Figma
Nest.js
ChakraUI
AWS Lambda
Redux
Express.js
Vanilla JS
FastAPI
D3.js
Linux
Rewards and achievements
Open source enthusiast
Tech influencer
Ready to start
ASAP
Direct hire
Potentially possible
Ready to get matched with vetted developers fast?
Let’s get started today!

Experience Highlights

Software Engineer
Oct 2024 - Ongoing6 months
Project Overview

AI-powered working activity tracker

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Responsibilities:
  • Created a desktop tool that collects info about user activity and sends it to the server for processing;
  • Built a server that processes a huge amount of client activity info using Open AI API;
  • Found a way to reduce the cost of Open AI API usage to 4x times.
Project Tech stack:
OpenAI API
Next.js
Node.js
PostgreSQL
Prisma
Bash
Front-end Team Lead
Nov 2023 - Ongoing1 year 5 months
Project Overview

NFT exchange platform

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Responsibilities:
  • Was responsible for continuous improvements of FE code to keep up-to-date;
  • Managed different chain integrations;
  • Contributed to open-source projects related to target integrations.
Project Tech stack:
React
NFT
Blockchain
Solidity
Firebase
Founder, CTO
Feb 2023 - Nov 20241 year 9 months
Project Overview

Founded a company specializing in software solutions and development services for manufacturing enterprises. Delivered a product based on Node.js and TypeScript for efficient management of production processes and real-time progress tracking.

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Responsibilities:
  • Developed a white-label app that is actively used by multiple clients from scratch and sold it;
  • Developed a responsive front end with React and Bootstrap and managed data with PostgreSQL and Prisma;
  • Made cross-platform DevOps scripts with Bash to run the app on different platforms;
  • Automated manual process of sensor data collection;
  • Worked on edge between software and hardware for the first time.
Project Tech stack:
Typescript
React
Node.js
Prisma
PostgreSQL
Bash
Bootstrap
RaspberryPi
Software Engineer
Sep 2023 - Nov 20232 months
Project Overview

An AI-powered app that simplifies CRM analytics for companies of any size, presenting insights in a user-friendly and intuitive manner.

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Responsibilities:
  • Migrated tech stack to improve the performance of daily data processing and API server;
  • Supported and refactored really bad legacy code on FE.
Project Tech stack:
Node.js
Azure Functions
Azure DevOps
Python
React
OpenAI API
Angular
Flask
Hubspot
PostgreSQL
Senior Full-stack Engineer
Dec 2022 - Jun 20235 months
Project Overview

This project is a platform aimed at facilitating the buyback and resale of unused clothing items, utilizing TypeScript as its core language. It involved collaboration with esteemed brands, including Kuyichi, Haglöfs, and Rains, to advance sustainable practices in the fashion industry. Backend development was conducted using Node.js and Nest.js, while the front end was built with Next.js and Chakra UI. Management of monorepo was achieved with NX, and the applications were hosted on the Azure cloud platform. Data storage was implemented using PostgreSQL, and Figma was employed for design collaboration throughout the development process.

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Responsibilities:
  • Reorganized Front-end and Back-end architecture;
  • Implemented the best practices of development processes to enhance the development experience and ensure efficient delivery.
Project Tech stack:
React
Next.js
Typescript
Node.js
Nest.js
ChakraUI
PostgreSQL
Figma
NX
Azure DevOps
Tech Lead
Oct 2021 - Jul 20228 months
Project Overview

Open Banking payment system that seamlessly integrated with leading banks in the UK and EU.

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Responsibilities:
  • Migrated from serverless stack to monolith;
  • Improved development flow by adding code checks and docs coverage;
  • Mentored four developers starting from scratch and helped them reach the junior level.
Project Tech stack:
Node.js
Typescript
AWS
AWS Lambda
React
Redux
Next.js
MongoDB
Figma
Styled-components
Project management
Core Contributor (Senior Full-stack Developer)
Sep 2018 - Jan 20223 years 4 months
Project Overview

Open-source project with 6k weekly downloads developed entirely from scratch. It features a React component designed for a simple login integration with Microsoft services, based on the Official Microsoft Authentication Library for JavaScript.

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Responsibilities:
  • Developed all components and functionalities from scratch;
  • Provided ongoing support over multiple years;
  • Ensured adherence to the Official Microsoft style guidelines throughout the project's lifecycle.
Project Tech stack:
React
npm
Microsoft Azure
OAuth
Typescript
Senior Full-stack Developer
Nov 2019 - Apr 20211 year 4 months
Project Overview

React components of Figma design system based on thomas-lowry/figma-plugin-ds, and implements UI2: Figma Design System.

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Responsibilities:
  • Spearheaded the launch of the open-source initiative for Figma as one of the founding members;
  • Collaborated closely with Figma officials to drive the initiative forward;
  • Successfully managed multiple projects within the Figma Plugins ecosystem;
  • Transformed a CSS UI framework into a comprehensive React UI components library.
Project Tech stack:
React
Figma
Typescript
npm

Languages

English
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