John Ruff

Hello, I am

John Ruff.

🌍 Full Stack || Blockchain Developer 🌍

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Services

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Mobile App Development

I create captivating mobile apps from concept to deployment for iOS and Android. Using cutting-edge technologies, I ensure seamless performance, intuitive interfaces, and robust functionality that align with your business goals. Enjoy a flawless user experience and outstanding results.

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Web Development

I deliver stunning, user-friendly websites to establish your online presence. From simple sites to complex e-commerce platforms, I provide tailored solutions using the latest frameworks and technologies for a seamless, responsive, and SEO-friendly browsing experience. Enhance your online identity with quality.

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Backend Development

I enhance digital applications with robust, scalable backend infrastructures. I develop efficient database structures, APIs, and configure servers for optimal performance, security, and scalability, ensuring your applications handle high traffic and complex data management seamlessly. Rely on strong backend solutions.

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Blockchain Development

I have successfully developed numerous smartconatact using Solidity, Rust and NFT marketplace website. I developed a solana NFT Game Demo project using Solana Web3, Next.js, Node.js and so on.

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DevOps

I streamline development and operations processes through effective DevOps practices. I implement continuous integration and deployment pipelines, manage cloud infrastructure, and use containerization to ensure efficient, reliable, and scalable software delivery. Improve your workflow with DevOps solutions.

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Database Management

I manage and optimize your database systems for performance, reliability, and scalability. With expertise in SQL and NoSQL databases, I design schemas, write complex queries, and implement best practices for data integrity and security. Ensure your data is managed effectively and efficiently.

Experiences

Apr 2023 - Present

Blockchain Engineer

@Freelance (Remote)

Collaborated with front-end developers to integrate blockchain functionalities into web applications using React and Web3.js.

Conducted code reviews and provided mentorship to junior developers, fostering a collaborative and knowledge-sharing environment.

Optimized performance and scalability of DApps through effective use of Layer2 scaling solutions and state channels.

Nov 2022 - Apr 2023

Blockchain Engineer

@Everledger (Remote)

Led the design and implementation of a multi-chain DeFi platform that increased transaction throughput by 50%.

Developed smart contracts for various DeFi applications, managing over $200M in total value locked.

Collaborated with cross-functional teams to integrate blockchain solutions into existing systems.

Mentored junior developers on blockchain best practices and smart contract development.

Jun 2020 - Nov 2022

DeFi Developer

@ZyCrypto (Remote)

Designed and implemented decentralized applications (dApps) for marketplace functionalities using Ethereum.

Utilized Solidity to develop and deploy smart contracts ensuring security and efficiency.

Conducted code reviews and security audits to enhance the reliability of blockchain applications.

Mar 2019 - Jun 2020

Smart Contract Developer

@Freelance (Remote)

Developed and optimized smart contracts for various tokenization projects on Ethereum.

Implemented automated testing frameworks to ensure the integrity of smart contracts.

Collaborated with front-end developers to create a seamless user interface using React.js and Web3.js.

Developed smart contracts for minting and trading NFTs compliant with ERC721 and ERC1155 standards.

Collaborated with product managers to define requirements and deliver innovativeblockchain solutions.

Jul 2016 - Apr 2019

Full-Stack Developer

@Synodus (Part-time/Freelancer)

Led the front-end development of a smart price recommendations platform used by large retail and eCommerce clients.

Built responsive web applications using JavaScript frameworks React.js, Node.js ,integrated with blockchain backends.

Developed RESTful APIs to connect frontend applications with blockchain data.

Developed server-side logic using Node.js and Express to support web applications.

Managed database interactions with MongoDB to ensure efficient data storage and retrieval.

Implemented security protocols to protect sensitive user data.

Collaborated with UX/UI designers to create engaging user experiences.

Optimized application performance for mobile and desktop platforms.

Designed and built a feature-rich e-commerce application using React Native, achieving a 25% increase in sales within the first quarter post-launch.

Assisted in the development of mobile applications for iOS and Android.

Developed and maintained high-quality applications for iOS and Android platforms.

Skills

Programming Languages

logo-JavaScript

JavaScript

logo-TypeScript

TypeScript

logo-Python

Python

logo-Dart

Dart

Frontend Development

logo-Next.js

Next.js

logo-React.js

React.js

logo-HTML

HTML

logo-CSS

CSS

logo-SASS

SASS

logo-Redux Toolkit

Redux Toolkit

Backend Development

logo-Node.js

Node.js

logo-Express.js

Express.js

logo-Socket.io

Socket.io

logo-Nest.js

Nest.js

Blockchain Development

logo-Solidity

Solidity

logo-Rust

Rust

logo-DApp

DApp

logo-Solana

Solana

logo-Ethereum

Ethereum

Mobile App Development

logo-Flutter

Flutter

logo-GetX

GetX

Database Management

logo-MongoDB

MongoDB

logo-PostgreSQL

PostgreSQL

logo-MySQL

MySQL

DevOps/VCS

logo-Docker

Docker

logo-AWS

AWS

logo-Git

Git

logo-GitHub

GitHub

Miscellaneous

logo-Firebase

Firebase

logo-Ubuntu

Ubuntu

Nontechnical Skills

logo-Problem Solving

Problem Solving

logo-Collaboration

Collaboration

logo-Analytical Skills

Analytical Skills

Recent Works

project-Travel  Website

Travel Website

Private

This Webiste have developed using Next.Js,TailwindCSS, MongoDB

Next

TailwindCss

MongoDB

Node.Js

AWS

project-Healthcare Chatbot

Healthcare Chatbot

Private

This project have developed using HTML, CSS, BootStrap, JavaScript in front-end, Google TensorFlow, Firebase, Dialog Flow API in Backend, Google Cloud

HTML

CSS

TensorFlow

Firebase

Dialog Flow API

project-Pumpfun Wallet Tool

Pumpfun Wallet Tool

Public

The ultimate trading suite for professional traders, featuring a fully modular interface and advanced trading tools

TypeScript

Node.Js

Bitquery

project-Algo IBKR Addon Window

Algo IBKR Addon Window

Public

This project is to make UserInterface for ALgo Trading and connect IBKR with userinterface using TWSAPI.

C#

TWS API

MongoDB

project-SmartContract for Tron

SmartContract for Tron

Public

SmartContract for Tron.

Solidity

project-US_Visa_Booking_Bot

US_Visa_Booking_Bot

Private

This is a bot which will book the US Visa Appointment for you.

Python

Selenium

BeautifulSoup