Billy Pissios

Full Stack Blockchain Developer

  • Member since February 21, 2023
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(per hour)
  • 00 ongoing Projects
  • 00 Completed Projects
  • 00 Services in Queue
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Here is a full stack developer with over 8 years of experience in web and blockchain development.

Have developed DEX, DeFi and NFT marketplace and  my role is frontend, backend, smart contract development and web3 integration.

Very familiar with EVM and Solana network and also experienced in Aptos and Move.

Well-versed in using Hardhat and Truffle for smart contract development and unit test.

My skills;

- Solidity, Rust, Haskell, GO, Cosmwasm, Move

- Hardhat, Truffle

- Node.js, PHP, Express, Loopback, NestJS, GraphQL, Subgraph

- C, C++, C#, Python, Java

- Flask, Django, Fast API

- Web3.js, Ether.js, CosmosJS, Alchemy

- Mocha, Chai

- React.js, Vue.js, Angular, Next.js, Nuxt.js

- Javascript, TypeScript

- Laravel, CodeIgniter, WordPress

- Game development, Unity3D

My experience;

- DeFi, DEX and NFT marketplace development


- Blockchain(NFT) game development

- Website development (frontend and backend)

Can start working immediately and can work in your time zone.

I will share my previous projects and relevant experience in an interview.

Please feel free to contact me if you have any projects or new job opportunities.

Best Regards


Full Stack Blockchain Developer

  • United In Change
  • August 9, 2022 - December 17, 2022

• Development of multiple web-based applications using a combination of the latest technologies, such as Python, Django, Flask and Fast API for the backend, and React, Vue, Angular for the frontend. • Utilized modern JavaScript features such as ES6 and TypeScript to build efficient, high-performing, and maintainable code. • Implemented server-side data validation and security measures to protect against common web application vulnerabilities. • Worked with a variety of databases, including NoSQL databases like MongoDB and SQL databases such as MySQL, PostgreSQL. • Collaborated with frontend developers to create efficient and reusable APIs. • Worked closely with the DevOps team to improve the overall performance and scalability of the web application. • Implemented and integrated various cloud services such as AWS, Azure, and GCP to improve the overall performance and scalability of the web application.

Full Stack Blockchain Developer

  • January 15, 2019 - August 23, 2022

• Worked well independently and on a team to solve problems. • Used JavaScript frameworks (React.js, Next.js, Vue.js), TypeScript, Node.js and Web3.js/Ethers.js to interact with the EVM and Cardano networks. • Developed and deployed smart contracts for DEX, DeFi, DAO and NFT marketplace and integrated frontend with smart contracts using Ethers.js and Moralis SDK. • Implemented secure coding practices to prevent common security vulnerabilities, such as those related to contract reuse, reentrancy, and integer overflows. • Organized and prioritized work to complete assignments in a timely, efficient manner. • Worked with a keen understanding of marketing operations and campaign efforts. • Established and maintained advantageous working relationships. • Developed the unit test cases using Hardhat and Mocha. • Stayed up-to-date with the latest developments in the blockchain and smart contract development communities by attending developer conferences and reading relevant articles and blog posts. • Effectively interact with team members and business users from different regions for requirements capture and analysis.

Full Stack Blockchain Developer

  • RikkeiSoft
  • May 16, 2018 - August 7, 2019

• Worked well independently and on a team to solve problems. • Blockchain engineering and Building Smart Contract using Solidity. • Debugged and resolved issues related to contract deployment, data storage, and transaction processing. • Developed and deployed smart contracts on the EVM blockchain network to support decentralized applications and token sales. • Worked with the UI/UX team to integrate smart contracts with the front-end of a decentralized exchange, enabling users to trade tokens and execute trades on the blockchain. • Scheduled daily tasks based on immediacy and importance. • Assisted with the recruiting and interviewing of new and potential employees. • Followed Agile software development practice paired programming, test driven development and scrum status meetings. • Worked and developed functionalities in Agile Methodology of SDLC and involved in Team planning and grooming sessions and Retro session in Agile environment. • Worked on Rest Web services as well as Node Rest framework for back-end services and developed back-end code using NodeJS/Strong-Loopback collections including Set, List, Map, Multi-threading and Exception Handling. • Work with Development, Storage and Network teams in installation and administration of MongoDB in the IT Enterprise Environment.

Educational Details

Computer science

  • University of Toronto
  • September 1, 2010 - September 18, 2014

Studied computer science and software engineering. Bachelor of computer science

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