Framer Designer & Developer

Karol Czerwinski

Based in Katowice, PL

Introduce

Say Hi from a Full Stack
& Blockchain Developer

My skills include both server-side and client-side development, using frameworks such as React, Vue, Node.js, Django, and Gin. With over 7 years of professional experience, I have worked on a wide range of projects, from financial platforms to enterprise web applications. I have also built websites for digital marketing agencies and worked as a freelance consultant. I am excited to join my next employer and contribute to shaping the future of the web.

7+

Years of
Experience

60+

projects completed on
8 countries

About

The future of the internet
is decentralized

My passion for web3 development stems from a belief in the power of community-driven innovation to change the world for the better.
Great things happen when people come together, which is why I love working with other developers and teams to create meaningful projects that make a difference in people's lives.

Resume

Education & Experience

2019 - 2023

Software Engineer

M8B, PL

- Spearheaded full life-cycle software development in multiple software environments.

- Programmed applications and tools using TypeScript, Node.js and Python object-oriented languages with goals for code abstraction, stability and reuse.

- Used Django, Express, React and Vue framework to build web apps for text editing, email campaign, management and video conferencing.

- Wrote 20+ lambda functions in Node.js/Python to AWS Lambda with API Gateway and Cloud Formation.

- Engineered, validated, and released secure smart contracts on various blockchain platforms, especially on EVMs and Solana. Successfully released 24+ contracts.

- Integrated Web3 on both front-end and back-end side using Ether.js, Web3.js.

- Conducted security audits and resolved vulnerabilities in smart contracts, back-end, as well as mobile programs. Ensured the safety of sensitive data and prevented potential security breaches.

- Led the development process of 5+ web2 and blockchain-related projects and mentored 2 junior developers. Successfully completed all projects on time and within budget.

2016 - 2019

Full Stack Developer

Netizens, PL

- Stayed current with emerging technologies and developed 10+ mobile applications.

- Created an application to control smart home devices through Bluetooth or Wi-Fi connectivity, resulting in a 15% increase in user engagement.

- Led the successful migration of an existing monolithic app from Python 2x and Flask to Python 3.x and Django, resulting in improved performance and compatibility. Additionally, accelerated future schema migrations by 30% through the implementation of optimized SQL scripts.

- Designed, developed, and deployed 20+ full-stack web applications tailored to the business objectives and needs of various clients using React, Express.js, MySQL, PostgreSQL, and MongoDB.

- By implementing SEO techniques in a React application with server-side rendering (SSR) using Next.js and Gatsby, successfully boosted page views per session by 23% for an e-commerce site with a catalog of 20,000+ products

- Performed test and audit for 12+ projects across the Netizens codebase, ensuring data safety and system performance.

2013 - 2016

BSc in Applied Computer Science

Wroclaw University of Science and Technology

- Studied Computer Science and Artifical Intelligence

- Researched ML-translation engine with corpus database written by Java and Python

- Rebuilt web application for school community platform

Services

My Specializations

Full Stack

As a full stack developer, I have worked on building and maintaining complex web applications for renowned companies. My experience in database management and server-side scripting has allowed me to build highly scalable systems that can handle large user traffic.

21 Projects

Mobile

During my previous work in mobile company, I have designed and developed multiple mobile applications for various industries such as healthcare, education, and finance. Additionally, I have collaborated with cross-functional teams to ensure seamless integration of the front-end and back-end functionalities.

12 Projects

Smart Contract

I have extensive experience in smart contract development on EVM and Solana networks and have built many decentralized applications such as token contracts, voting systems, and supply chain management solutions. Furthermore, I have worked closely with different stakeholders to understand their requirements and provide customized solutions.

28 Projects