Logo
Jakub – React, React Native, Node.js, experts in Lemon.io

Jakub

From Poland (UTC+2)

flag
Mobile DeveloperSenior
Full-stack Web DeveloperSenior
5 years of commercial experience
AI
Banking
Blockchain
Cryptocurrency
E-commerce
Entertainment
Fintech
Fundraising
Gamedev
Logistics
Maritime
NFT
Retail
Social impact
Trade
Mobile apps
Platforms
Utilities
Web3
Gaming software
Web development
Lemon.io stats
5
projects done
1606
hours worked
1
offers now 🔥

Jakub – React, React Native, Node.js

With 5 years of experience under his belt, Jakub has a deep understanding of Javascript/Typescript and its various libraries and frameworks. He's a Senior front-end/mobile developer whose strengths lie in his exceptional knowledge of React, React Native and a great acquaintance with Node.js. He holds a Bachelor's degree in Computer Science and has proven himself to be an excellent communicator in both technical and non-technical English.

Jakub also has hands-on experience integrating AI tools, including OpenAI and Anthropic chat models. If you're looking for a developer who can deliver exceptional results, Jakub is your man!

Main technologies
React
4 years
React Native
4 years
Node.js
3 years
Typescript
2 years
Next.js
2.5 years
JavaScript
4 years
Additional skills
MongoDB
Nest.js
Fastlane
Symfony
Material UI
Expo
Playwright
GitLab CI/CD
RabbitMQ
PostgreSQL
Solana
Three.js
Redis
GraphQL
Tailwind CSS
Express.js
Prisma
Figma
Solidity
Wagmi
web3.js
Web scraping
Python
Docker Compose
TelegramBotAPI
OpenAI API
Stripe API
Smart contracts
Testimonials
"His performance is as great as we expected, he is really experienced developer. "
Direct hire
Potentially possible
Ready to get matched with vetted developers fast?
Let’s get started today!

Experience Highlights

Tech Lead
Feb 2025 - Ongoing4 months
Project Overview

Telegram bot that scrapes news about new listings on popular exchanges and allow users to instantly trade on connected exchanges

Responsibilities:
  • Created Telegram bot interface;
  • Integrated with Bybit, Binance, Gate.io, and MEXC;
  • Created a system that scrapes listings from all popular exchanges;
  • Created an AI assistant that analyzes tokens and gives advice for bot users.
Project Tech stack:
Node.js
Typescript
Prisma
TelegramBotAPI
AI
Python
Docker Compose
PostgreSQL
WebSocket
Web scraping
Senior Front-end Developer
Nov 2024 - Ongoing6 months
Project Overview

One of the largest ferry ticketing companies.

Responsibilities:
  • Developed pixel-perfect, responsive UI components based on Figma designs;
  • Refactored and modernized the legacy codebase to integrate newly built components;
  • Actively contributed to discussions and decisions regarding frontend architecture and best practices.
Project Tech stack:
React
Next.js
Zustand
CSS
Blockchain Engineer
Jan 2025 - Mar 20251 month
Project Overview

This is an all-in-one decentralized finance hub.
From creating liquidity pools to accessing smart dashboards,
the app helps users identify the best yields, optimize their portfolio, and automate transactions, all backed by T-Bill yields.

Responsibilities:
  • Integrated with UniswapV4 protocol (Liquidity Pool creation);
  • Audited TokenFactory smart contract;
  • Built front-end for Liquidity Pool creation;
  • Integrated with Uniswap's subgraph;
  • Created a staking smart contract.
Project Tech stack:
Solidity
React
Typescript
web3.js
Wagmi
Full-stack Developer
Nov 2024 - Dec 20241 month
Project Overview

A Web3 project featuring an AI-driven interview process. Users underwent three evaluation stages: Twitter profile analysis, a knowledge test, and an AI-conducted interview. The process concluded with a performance report and score.

Responsibilities:
  • Created front-end and back-end architecture;
  • Deployed the project infrastructure and services on AWS;
  • Built a custom reporting system from scratch, tailored to business needs;
  • Integrated Anthropic AI models to enhance product capabilities;
  • Developed a unique, automated interviewing pipeline to streamline candidate evaluation.
Project Tech stack:
React
Next.js
Node.js
Express.js
Prisma
PostgreSQL
Front-end Team Lead
Mar 2024 - Apr 2024
Project Overview

The project is about creating one of the first AI-related NFT collections in the company's game universe.

Responsibilities:
  • Led the front-end team, overseeing the development;
  • Delivered an innovative solution integrating Web3 technologies with AI capabilities.
Project Tech stack:
Solana
Nest.js
Three.js
Redis
RabbitMQ
PostgreSQL
Next.js
Senior Javascript Developer
Aug 2023 - Apr 20248 months
Project Overview

One of the most important freight exchanges in Europe, which offers a modern logistics platform for road transport. The platform brings together shipping companies, logistics operators, forwarders, and carriers.

Responsibilities:
  • Facilitated the migration from an outdated Leaflet map system to a modern, scalable Mapbox solution;
  • Maintained and optimized legacy code built on a custom framework, ensuring stability and performance.
Project Tech stack:
Nest.js
PostgreSQL
TypeORM
RabbitMQ
MapBox
React
React Native
Senior React Native Developer
Feb 2022 - Mar 20231 year 1 month
Project Overview

It is a company that specializes in developing apps for charity organizations, football teams, parishes, etc. The app comprises essential social platform elements and allows companies to raise money for goals and events. The project was fascinating as over 50 apps shared the same React native codebase.

Responsibilities:
  • Updated and refactored 4-year-old social modules, leveraging React hooks and context for improved performance and maintainability;
  • Debugged and resolved multiple critical bugs to ensure a seamless user experience;
  • Developed over 10 new variants of the app, expanding its functionality and adaptability;
  • Introduced Jira for project management and implemented Sprint releases, transitioning from Redmine;
  • Created comprehensive API documentation, addressing the previous lack of documentation and improving team collaboration.
Project Tech stack:
React Hook Form
React Native
Redux
Redux Saga
Fastlane
Typescript
Front-end Developer
Dec 2022 - Mar 20232 months
Project Overview

This is one of the UK's most innovative blockchain-related start-ups. Its goal is to simplify and accelerate the mortgage process. It consists of multiple apps that a typical broker would use into one well-designed app.

Responsibilities:
  • Refactored and redesigned the mortgage sourcing app;
  • Implemented document signing functionality;
  • Builta mortgage affordability app based on webscraping;
  • Wrote unit tests for each functionality;
  • Built reusable components in the shared library.
Project Tech stack:
React
GitLab
GitLab CI
CD
Playwright
Typescript
React Hooks
Styled-components
GraphQL
Next.js
Front-end Developer
Aug 2020 - Nov 20211 year 2 months
Project Overview

This is a Polish fintech company that sends money from the UK to Poland. Apps allow clients to manage accounts and send money with different transfer types.

Responsibilities:
  • Developed secure applications for safe money transfers;
  • Designed intuitive mockups in Figma, ensuring a user-friendly interface;
  • Collaborated with project managers to define and optimize UX workflows;
  • Proposed and implemented a modern front-end architecture to enhance scalability and performance.
Project Tech stack:
React Native
Redux
Cake PHP
React
React Hook Form
React Hooks
Typescript
Full-stack Developer
Dec 2020 - Aug 20217 months
Project Overview

This is one of the biggest Polish CRM. They decided to make a side-project that consisted of creating a 'buy now pay 30 days later' form that could be integrated into e-commerce sites.

Responsibilities:
  • Maintained the old version of the solution;
  • Implemented and deployed new architecture to simplify the deployment process;
  • Implemented kontomatik integration;
  • Wrote tests for the new frontend architecture;
  • Created CI/CD scripts.
Project Tech stack:
Symfony
Hapi.js
Nest.js
React
Next.js
Tech Lead / React Native Developer
Feb 2021 - Apr 20212 months
Project Overview

This is a Polish electronic shop and e-commerce company. They wanted to deploy an app that would allow them to engage with their customers.

Responsibilities:
  • Created a native login form and enabled biometric login;
  • Worked on advanced JavaScript code that allowed the website to communicate with the native app;
  • Created a push notifications system with a simple CRM.
Project Tech stack:
React Native
Redux
Team Lead / React Native Developer
Nov 2020 - Mar 20214 months
Project Overview

The project's goal was to create an app that contains a blog, 2D games, social competitions, and photo editing capabilities. It gives the company a social platform to host events and connect to customers. The app was developed in React Native, which allowed swift project delivery due to the nature of the cross-platform technology.

Responsibilities:
  • Split tasks between two other members of his team;
  • Deployed the app on the Google Play Store and the App Store;
  • Convinced the client to use Expo SDK to provide on-air updates in a testing environment;
  • Implemented push notifications with a simple CRM;
  • Created integration with WordPress blog API (fetching categories, tags, displaying blog pages inside the app);
  • Developed a photo editing module, featuring filters and stickers, to enhance user creativity;
  • Crested 2 different 2d games (memory and "czółko").
Project Tech stack:
React Native
Redux
Redux Thunk
WordPress
Typescript

Education

2022
Computer Science
BSc with first class honours

Languages

English
Advanced

Hire Jakub or someone with similar qualifications in days
All developers are ready for interview and are are just waiting for your requestdream dev illustration
Copyright © 2025 lemon.io. All rights reserved.