Joey Stockermans
Founder at Mokomoko
Ishigaki, Okinawa, Japan
Summary
👤
Senior🎓
Top SchoolJoey Stockermans is a founder and CTO with 11 years of engineering experience building production-grade systems and teams across fintech, marketplaces, and consumer platforms. He led custody and NFT product engineering at Gemini—protecting billions in assets—and bootstrapped AkiyaMart into a high-six-figure ARR real estate platform serving 10,000+ users and 80+ cross-border purchases. Technically versatile, Joey has shipped backend systems in Scala, Java, Python, Go and contributed to prominent open-source Ethereum tooling like web3.py and eth-tester. His background in data science informs pragmatic performance and testing improvements that have turned multi-hour jobs into millisecond tasks and hardened QA for blockchain integrations. Based in Ishigaki, Japan, he blends product-first startup instincts with institutional-grade security and a curious history that even includes leading roles in Japanese children’s television.
11 years of coding experience
8 years of employment as a software developer
BA, International Economics and Business, BA, International Economics and Business at International Christian UniversityMaster of Philosophy, Economic Research, Master of Philosophy, Economic Research at University of Cambridge
English, Japanese
Github Skills (8)
pytest10
web3py10
python10
ethereum10
blockchain10
testing10
backend9
back-end-development9
Programming languages (9)
Github contributions (5)
ApeWorX/web3.py
Nov 2017 - Apr 2018
A python interface for interacting with the Ethereum blockchain and ecosystem.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:12 commits, 16 PRs, 19 comments in 5 months
Contributions summary:Joey primarily contributed to the `ethereum/web3.py` repository by implementing and refining functionalities related to interacting with the Ethereum blockchain. Their work included adding the `eth_getLogs` method, formatting parameters for it, and converting the status code from hex to integer in `getTransactionReceipt`. They also made updates to test the handling of byte arrays as arguments.
blockchainethereumpython
ApeWorX/eth-tester
Jan 2018 - Jan 2018
Tool suite for testing ethereum applications.
Role in this project:Backend & QA Engineer
Backend & QA EngineerContributions:6 commits, 1 PR, 8 comments in 5 days
Contributions summary:Joey primarily focused on improving the testing infrastructure for the `eth-tester` project, a tool suite for testing Ethereum applications. Their contributions included adding comprehensive tests for different Ethereum implementations like pyethereum16, pyethereum21, and py-evm. Additionally, the user refactored and corrected core backend functionalities within the pyethereum backend, specifically addressing how calls and transactions interact with the test environment after failures.
ethereumtesting
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