Caleb – Ethers.js, Smart contracts, Solidity

It's an automated MEV searcher and arbitrage platform for Ethereum and EVM-compatible sidechains, focused on mempool monitoring, transaction simulation, generalized frontrunning research, and automated execution of profitable opportunities.

• Designed and implemented the core TypeScript/Node.js system for listening to pending mempool transactions, filtering candidate transactions, and generating simulation variants.
• Built transaction analysis logic to inspect calldata, identify ERC-20 token addresses, detect externally owned account addresses, evaluate internal transaction recipients, and generate modified transaction candidates.
• Developed a large Solidity smart contract used for transaction simulation, profitability checks, execution support, and revert-on-unprofitable protection.
• Wrote Foundry/Forge Solidity tests and TypeScript/Node.js tests for the simulation and execution contracts, with extensive coverage of core execution paths.
• Built deployment scripts and operational tooling for deploying contracts across the Ethereum mainnet and EVM sidechains, including Polygon and Binance Smart Chain.
• Optimized node connectivity by using IPC-based communication with locally hosted blockchain nodes to reduce network overhead and improve simulation throughput.
• Designed and maintained self-hosted infrastructure for running multiple blockchain nodes and simulation workers, including Dockerized node deployments on a high-core-count server with high-memory and high-throughput NVMe storage.
• Operated the system in production on Polygon and Binance Smart Chain, processing high transaction volumes and generating live MEV/arbitrage revenue.

It's a liquidation-free, high-LTV crypto lending system using DEX swaps and options-like payoff structures.

• Built the protocol from the ground up while focusing on security and exploit protection.
• Architected and implemented core smart contracts and supporting technical design for the product's initial build-out.
• Helped secure more than $1M in funding by pitching the product and technical vision to a16z and led the team through the a16z Crypto Startup Accelerator in London as the sole engineer.

It's an automated agent-based smart contract vulnerability scanner.

• Designed and prototyped the overall architecture for an AI-agent-based smart contract security analysis system during a one-month contract engagement.
• Built code ingestion and retrieval workflows for processing Solidity smart contract repositories and making relevant contract context available to GPT-4 through retrieval-augmented generation.
• Integrated LangChain and Pinecone to support vector-based search over smart contract source code, documentation, and protocol context.
• Developed prompt chains and agent workflows for identifying common Solidity and DeFi vulnerability classes, including re-entrancy, ownership and access-control failures, governance attack paths, and other known exploit patterns.
• Implemented analysis flows that allowed the system to retrieve relevant code snippets, reason about potential vulnerabilities, and produce written findings for review.
• Tested the system against representative Solidity vulnerability patterns to evaluate its ability to identify and explain potential exploit paths.
• Iterated on retrieval strategy, prompting, and agent behavior to improve accuracy despite the limited context windows and model capabilities available at the time.
• Delivered a working prototype within the contract period, including the core codebase, retrieval pipeline, agent logic, and vulnerability analysis workflows.

It's a decentralized stablecoin issuer and a protocol-controlled value store.

• Designed, prototyped, and implemented core and peripheral smart contracts, security checks, testing framework, and middleware utilities for the Fei stablecoin and Tribe governance token.
• Developed and audited more than 20 smart contracts for governance and protocol-controlled value systems and implemented security auditing frameworks for the protocol.
• Led design and development on the protocol through reaching a peak of $3.5B in protocol-controlled value.
• Started as the sole Solidity engineer, interviewed candidates, mentored junior engineers, and helped grow the engineering team by five hires.
• Designed and implemented a Markle-tree smart contract for token redemption along with monitoring infrastructure.
• Implemented a security monitoring framework with automated scripts and checks via OpenZeppelin Defender and PagerDuty, along with custom hourly scripts to protect protocol-controlled value.
• Created and administered the protocol bug-bounty program through ImmuneFi, triaging issues and coordinating responses to high- and critical-security issues.

It's a decentralized compute marketplace that enables users to rent out unused computing resources to others through a secure, distributed network.

• Researched and architected Layer 2 payment-channel systems for metered and subscription-based compute services with Ethereum as the source of finality using Connext DAO and instant settlement.
• Developed Solidity contracts and the middleware and infrastructure needed to connect off-chain application logic with on-chain settlement.
• Served as the primary blockchain engineer for the project.

It's an internal warehousing and inventory system used by the company's employees and Home Depot operations across the United States.

• Built a Node.js and webdriver.io automated test suite integrated with BrowserStack and CI/CD pipelines for the main company product.
• Created CI/CD pipelines for automated testing with commit hooks and hourly smoke checks via GitHub CI.
• Created process documentation and built dashboard-based monitoring with high-priority error alerting and at-a-glance resource visibility.

It's a fully on-chain casino platform backed by more than 20 interoperable Ethereum smart contracts, a dynamic bankroll system, and a tokenization system that lets users receive a portion of house profits by holding the protocol token.

• Led a distributed team of 9 engineers.
• Developed Solidity contracts and automated tests using Truffle and Ganache while coordinating with a Vue.js/web3 frontend-based team of developers.
• Secured the smart contract and bankroll platform against malicious attackers and set up monitoring and alerting systems that enabled mitigation of exploit attempts.