contractJefferyAkorfulis BlockchainEngineerDesigns, tests and ships smart contract systems.that’s me
@notice
Smart-contract & DeFi engineer. Solidity + Foundry. Contracts, tests, indexers, and the app on top.
@dev
I like owning the whole thing: the contract that holds the money, the tests that try to take it, the indexer that watches it, and the interface people actually click. Most of my work is DeFi, across EVM and other networks. I’d rather a contract enforce the rules than trust anyone to follow them, and I learn a new stack by shipping something on it.
Work
Three builds in depth, with their tests and deployed contracts. 14 more below, plus 2 earlier builds.
From the contract to the interface, and the tests that hold it together.
01
DeFi protocols
Lending, staking, and vaults: collateral management, interest-rate logic, reward distribution, and precision-safe math, built gas-efficient and tested before deployment.
02
Cross-chain
Messaging and bridge integrations that move assets and state between networks, with message validation and replay protection built in.
03
Security and testing
Unit, fuzz, and invariant suites, static analysis and access-control design, so edge cases surface before deployment.
Onchain indexers, event pipelines and real-time services that track protocol state and keep dashboards and automation current.
06
dApps and wallets
The app on top: wallet onboarding, typed signing flows and live contract state, across EVM and non-EVM chains.
Experience
Really Great Tech
Blockchain Engineer · Hybrid
currently here! Dec 2025 – Present
Design and build lending and staking DeFi protocols on EVM chains: collateral management, interest-rate logic, and reward distribution, with an emphasis on gas efficiency and test coverage.
Integrate cross-chain messaging for asset and state transfers across EVM networks, building message validation and replay protection into the bridge integrations.
Build and maintain backend services and onchain indexers that track protocol events, contract state, and user positions in real time, powering internal dashboards and automated operations.
Write unit, fuzz, and invariant test suites in Foundry across lending, staking, and cross-chain modules, catching edge cases in reward math, token accounting, and reentrancy paths before deployment.
Contribute to architecture decisions on governance, treasury structure, and access control across DeFi and DAO systems.
Npontu Technologies
Intelligent Systems Intern · Hybrid
Oct 2024 – Dec 2024
Built a real-time pipeline streaming MySQL and PostgreSQL changes into Kafka with Kafka Connect and Debezium, with Filebeat and Logstash ingestion into Elasticsearch.
Fine-tuned a Gemini model for a customer-support chatbot and shipped the full-stack app with OAuth, Docker, and Railway.
National Information Technology Agency
SOC Analyst Intern · On-site
Sep 2023 – Dec 2023
Monitored and analyzed security alerts across SIEM tooling and live network traffic, using log analysis to find indicators of compromise.
Helped investigate and resolve incidents (malware, phishing, and unauthorized access) and fed threat-intelligence findings back into detection.
2023 – Present
Education
BSc Computer Engineering · Kwame Nkrumah University of Science and Technology, Kumasi · 2025
Google Cybersecurity Professional Certificate (Coursera, 2024) · 84 badges on Credly ↗
Contact
Building something? Let’s talk.
Building something or hiring for it? Tell me what you’re working on and we’ll take it from there.
Foundry
Solidity
TypeScript
USDC
Hardhat
iExec Nox