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I'm a developer who specializes in... from... Give an introduction about yourself, who are you, what are your most important skills and what differentiates you from other devs. This is the first thing clients will see. They are often interested in sector experience and knowledge, so please mention it. --- Employment and project experience Senior Developer Salesforce Inc. _January 2017 - March 2017_ Full-stack Developer Microsoft Inc. _January 2019 - March 2019_…I'm a developer who specializes in... from... Give an introduction about yourself, who are you, what are your most important skills and what differentiates you from other devs. This is the first thing clients will see. They are often interested in sector experience and knowledge, so please mention it. --- Employment and project experience Senior Developer Salesforce Inc. _January 2017 - March 2017_ Full-stack Developer Microsoft Inc. _January 2019 - March 2019_

Giorgos Kourtellos

Full Stack Developer, Blockchain Developer, Web Developer

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I'm a developer who specializes in... from... Give an introduction about yourself, who are you, what are your most important skills and what differentiates you from other devs. This is the first thing clients will see. They are often interested in sector experience and knowledge, so please mention it. --- Employment and project experience Senior Developer Salesforce Inc. _January 2017 - March 2017_ Full-stack Developer Microsoft Inc. _January 2019 - March 2019_…I'm a developer who specializes in... from... Give an introduction about yourself, who are you, what are your most important skills and what differentiates you from other devs. This is the first thing clients will see. They are often interested in sector experience and knowledge, so please mention it. --- Employment and project experience Senior Developer Salesforce Inc. _January 2017 - March 2017_ Full-stack Developer Microsoft Inc. _January 2019 - March 2019_

Available to hire

Limassol, Cyprus

I’m a developer who specializes in… from…

Give an introduction about yourself, who are you, what are your most important skills and what differentiates you from other devs. This is the first thing clients will see. They are often interested in sector experience and knowledge, so please mention it.

Employment and project experience

Senior Developer Salesforce Inc.
January 2017 - March 2017

Full-stack Developer Microsoft Inc.
January 2019 - March 2019

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Greek, Modern

Fluent

Work Experience

Sr. Fullstack Web3 Engineer at DeFi Labs GmbH – Nudge.xyz

October 1, 2024 - Present

Participated in system design and architecture for scalable on-chain and off-chain components. Set up infrastructure in Vercel and AWS, automating deployment through GitHub CI/CD pipelines. Developed secure smart contracts using Solidity and Foundry for testing and optimization. Built full-stack applications with TypeScript, React, Next.js, and Supabase for scalable and user-friendly solutions.

Sr. Blockchain / Web3 Engineer at OwnPlay Co. – CityVerse Tycoon

September 30, 2024 - August 6, 2025

Researched and analyzed various EVM blockchains to find the most appropriate blockchain for smart contract deployment. Designed and developed custom ERC721 / ERC1155 smart contracts for the game. Investigated and developed proofs of concept with fiat-to-crypto and crypto-to-fiat solution providers. Developed PoCs to enhance user experience for non-web3 native users using Account Abstraction (ERC4337). Collaborated closely with backend and frontend teams for seamless blockchain integration.

Sr. Smart Contract Engineer at MonaxLabs – Aspen NFT

October 1, 2023 - August 6, 2025

Designed, developed, and deployed complex smart contracts on Ethereum using Solidity. Collaborated with clients and cross-functional teams to meet project requirements. Created custom Ethereum tokens (ERC721, ERC1155) supporting decentralized applications. Executed comprehensive unit and integration tests using Hardhat and Foundry. Implemented upgradeable smart contracts using proxy patterns, and presented technical solutions to stakeholders. Stayed current with blockchain and Ethereum ecosystem developments.

Chief Blockchain Architect - CTO at Bloxxy – LaCucina

September 1, 2022 - August 6, 2025

Selected and ensured compatibility of system component design solutions. Established and documented standards for operational and quality compliance. Evaluated system architecture for security and scalability. Communicated project information via presentations, technical reports, and white papers. Developed and approved project plans, schedules, and budgets. Contributed to employee development plans supporting job-specific skills.

Chief Blockchain Architect - Head of Development at Decentralized Vision – PumaPay

September 1, 2022 - August 6, 2025

Designed and implemented subscription-based payments (pull payments) on Ethereum blockchain. Liaised with staff and clients to understand system requirements. Developed application-specific software to meet project goals. Developed system engineering, software engineering, system integration, and distributed system architectures. Advised on project costs, design concepts, and changes.

Sr. Full Stack Developer at IBM Client Innovation Center – Benelux

February 1, 2018 - August 6, 2025

Worked on multiple projects as a full stack developer including blockchain projects for grid balancing, financial post-trading using Hyperledger Fabric, and power forecasting of wind farms. Responsible for entire process from design workshops to delivering final products. Involved in trade finance blockchain PoC and expansion of Calvin Klein B2C web store implementing responsive design for mobile and tablets.