Sebastian Lorenz
CTO at Freelancing
Vienna, Austria
Summary
🤩
Rockstar🎓
Top SchoolSebastian Lorenz is a CTO and seasoned full-stack engineer with 13 years of experience building developer-focused platforms and blockchain tooling from Vienna. He co-founded Avantgarde Finance and now leads technology at Edge & Node, blending hands-on development with strategic product leadership. Sebastian has deep backend expertise shown by contributions to prominent open-source projects like Guzzle and Hardhat, and practical experience integrating auth, OAuth, and GraphQL systems across PHP, TypeScript, and Solidity stacks. His work often targets developer ergonomics and reliability—examples include authentication integrations in Lagoon and block-tag handling improvements in Hardhat. Originally trained in medicine, he brings an analytical, systems-thinking approach to engineering and product problems. Comfortable toggling between core protocol fixes and high-level architecture, he thrives on making complex distributed systems more predictable and usable.
13 years of coding experience
4 years of employment as a software developer
Medicine, Medicine at Medical University of Vienna
English, German
Github Skills (48)
hardhat10
caching10
drupal10
javascript10
graphql-php10
solidity10
back-end-development10
apidoc10
testing10
user-authentication10
typescript10
authentication10
wpgraphql10
guzzle10
psr-710
Programming languages (19)
Github contributions (5)
drupal-graphql/graphql
Aug 2015 - Oct 2019
GraphQL integration for Drupal 9/10
Role in this project:
Back-end Developer
Back-end DeveloperContributions:446 commits, 592 PRs, 1161 pushes in 4 years 2 months
Contributions summary:Sebastian's contributions centered around implementing GraphQL integration for the Drupal CMS. This included adding field schema providers, particularly for custom entity reference functionality. They refactored the code to leverage the typed data API, enabling the proper resolving of schema types, adding support for various field types, entity loading, and caching. Their work focused on the core architecture and resolving the schema types within the system.
drupaldrupal-9graphqldrupal-8
enzymefinance/protocol
Nov 2018 - Dec 2022
Enzyme Protocol Implementation
Role in this project:Back-end Developer
Back-end DeveloperContributions:4 releases, 274 commits, 84 PRs in 4 years 1 month
Contributions summary:Sebastian primarily focused on implementing core functionality and making environment-related fixes within the Enzyme protocol implementation. They modified solidity code, adding and refactoring several files to include features like sync deployment retrieval and environment construction. Their contributions also involved debugging and fixing existing solidity code.
enzymeblockchaindefiethereumprotocol
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.