Twine
Twine

I am a senior full-stack developer. s a Senior Full-Stack Developer, I specialize in creating scalable, high-performance web and mobile applications. With expertise in React, Vue, Angular, and Next for front-end development, and

TomaszKowalski

I am a senior full-stack developer. s a Senior Full-Stack Developer, I specialize in creating scalable, high-performance web and mobile applications. With expertise in React, Vue, Angular, and Next for front-end development, and Node.js (Express, Nest) and Python frameworks (Django, Flask, FastAPI) for the back-end, I deliver robust solutions that scale with business growth. Additionally I have enough experience of development for CMS using Webflow and WordPress. I design efficient APIs using RESTful and

Available to hire

I am a senior full-stack developer.
s a Senior Full-Stack Developer, I specialize in creating scalable, high-performance web and
mobile applications.
With expertise in React, Vue, Angular, and Next for front-end development, and Node.js
(Express, Nest) and Python frameworks (Django, Flask, FastAPI) for the back-end, I deliver
robust solutions that scale with business growth.
Additionally I have enough experience of development for CMS using Webflow and WordPress.
I design efficient APIs using RESTful and GraphQL protocols, ensuring seamless data exchange across platforms.
My experience with MongoDB, MySQL, and PostgreSQL enables me to build optimized, reliable data architectures tailored to each project’s needs.
Passionate about innovation, I solve complex technical challenges and deliver solutions that align with both business and user requirements.

My work Experience:
Full-Stack Web Developer
Digis
08/2022 -12/2024 Odesa, Ukraine
• Developed scalable SaaS platform E-Commerce and Shopify Platform using the MEAN
stack, optimizing performance and maintainability.
• Integrated OpenAI API and Claude AI to generate personalized product
recommendations, improving conversion rates by 15%.
• Implemented Server-Side Rendering (SSR) for React to enhance SEO rankings and improve
page load speeds.
• Optimized the UI for performance by using image optimization techniques, lazy loading,
and Code splitting to ensure faster page load times, improving the overall customer
experience and SEO.

Full-stack Web Developer
Hong Kong Cyberport
11/2019- 07/2022 Hong Kong, Hong Kong
• Designed and developed custom backend services using Node.js and Express.js, building
RESTful APIs to integrate Shopify with third-party services such as payment gateways,
shipping providers, and ERP systems.
• Leveraged Shopify Admin API, Storefront API, and GraphQL to create efficient, flexible
queries, allowing the frontend to request only the necessary data and improving load
times.
• Leveraged GraphQL to improve data fetching efficiency, allowing the frontend to retrieve
only necessary fields and reducing bandwidth usage.

Junior Developer
Atos
09/2017 - 10/2019 Hong Kong, Hong Kong
• Assisted in developing backend services using Node.js and Express.
• Maintained SQL and NoSQL databases, optimizing performance.
• Fixed bugs, wrote unit tests, and contributed to API development.

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Experience Level

AngularJS
Expert
SQLite
Expert
React JS
Expert
Express
Expert
PHP
Expert
Node.js
Expert
JavaScript
Expert
MongoDB
Expert
C++
Expert
Vue.js
Expert
MySQL
Expert
GraphQL
Expert
Python
Expert
TypeScript
Expert
C#
Expert
Flutter
Expert
Django
Expert
Kotlin
Expert
PostgreSQL
Expert
.NET
Expert
React Native
Expert
Spring
Expert
Swift
Expert
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Language

English
Fluent
Chinese
Advanced

Education

Bachelor’s Degree in Computer Science at Hong Kong University of Science and Technology
September 2, 2013 - July 3, 2017

Qualifications

Add your qualifications or awards here.

Industry Experience

Healthcare, Wholesale & Distribution, Travel & Hospitality, Education

Experience Level

AngularJS
Expert
SQLite
Expert
React JS
Expert
Express
Expert
PHP
Expert
Node.js
Expert
JavaScript
Expert
MongoDB
Expert
C++
Expert
Vue.js
Expert
MySQL
Expert
GraphQL
Expert
Python
Expert
TypeScript
Expert
C#
Expert
Flutter
Expert
Django
Expert
Kotlin
Expert
PostgreSQL
Expert
.NET
Expert
React Native
Expert
Spring
Expert
Swift
Expert
See more

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