Solidity · Yul · Foundry · Celestia · Modular Rollups · EVM Internals · FHE · TypeScript

I’m a smart contract engineer, protocol researcher, and full-stack Web3 builder with 6+ years of experience shipping production systems across:

• DeFi protocols and on-chain marketplaces
• Modular rollups (Celestia / Rollkit / Ethermint)
• Explorers & verification tooling
• FHE & cryptography-driven applications
• Decentralized education & media protocols

I’ve contributed to audited, production-grade DeFi, designed sovereign rollup architectures, built developer tooling for real networks, and taught 30+ students Solidity, EVM internals, and security.

Right now I’m focused on:

• Advanced Solidity/Yul engineering
• Protocol / infra design on modular stacks
• DED, a decentralized education protocol for verifiable, peer-to-peer learning

Smart Contracts & Security
Solidity · Yul · Foundry · Hardhat · gas optimization · fuzzing · invariants · audit prep

Blockchain / Infra
Celestia · Rollkit · Ethermint · DA layers · IPFS · Filecoin · Sourcify · FHE

EVM Internals
Opcodes · stack/memory analysis · gas profiling · low-level assembly

Full Stack
TypeScript · Node.js · Prisma · PostgreSQL · Next.js · React · Angular

Other
WebRTC · Python · Golang · hypergraphs · wallet integrations

DED is a protocol and platform for permissionless, trust-minimized, peer-to-peer education.

It explores:

• Verifiable learning sessions

  • On-chain commitments around live instruction
  • Identity-agnostic participation with cryptographic guarantees

• Transparent payment & escrow flows

  • Conditional settlement and dispute-aware escrows
  • Incentive-aligned economics for students and instructors

• Decentralized credentialing

  • “Proof-of-learning” artifacts
  • Non-transferable completion receipts and on-chain skill attestations

• Replayable, permissioned sessions

  • Controlled access to session recordings
  • Rental / licensing flows enforced on-chain

Implementation spans Solidity, rollup-friendly design, and WebRTC-driven live sessions.
Current status: MVP contracts + frontend + WebRTC integration on testnet, pushing toward mainnet.

A decentralized contract verification + explorer stack integrating Sourcify, serverless indexing, and a dev-friendly UI.

Highlights:

• Sourcify-based contract verification flows
• Explorer-style UX for multiple networks
• ABI/metadata pipelines and schema design
• Serverless APIs for contract and transaction data

Tech: Solidity, Next.js, TypeScript, Node.js, Prisma

🔗 Repo: https://github.com/modularcloud/explorer

An NFT-native social protocol for publishing and interacting with dynamic on-chain media.

My work (high level):

• Core smart contract architecture & modular NFT primitives
• Ownership & access control flows
• Metadata and minting mechanisms
• Backend/indexer integration and UX-driven contract APIs

Tech: Solidity, Foundry, Angular, TypeScript, Node.js

Code is private under NDA; happy to discuss patterns and architecture at a high level.

Contributions to Wells (Basin), a production-grade ERC-20 DEX:

• Implemented new features and protocol logic
• Wrote stateful fuzz tests & invariants
• Performed gas optimization and audit-prep improvements

Tech: Solidity, Yul, Foundry, Hardhat

🔗 Repo: https://github.com/BeanstalkFarms/Basin

A collection of experiments in Yul and low-level EVM patterns:

• Opcode-level control flow and micro-optimizations
• Storage and memory layout patterns
• DeFi primitive prototypes written close to the metal

Tech: Yul, Solidity, Foundry

🔗 Repo: https://github.com/pynchmeister/yul-greatest-hits

An MVP exploring long-term verifiable storage on top of Celestia:

• Architecture for data availability + content addressing
• Off-chain storage with on-chain proofs
• DA-aware application patterns for future rollups & dApps

Tech: Celestia, Rollkit, Ethermint, TypeScript, IPFS/Filecoin

🔗 Repo: https://github.com/pynchmeister/celestia-long-term-data-storage-mvp

I actively contribute to open-source Web3 infra and protocol tooling.

Selected upstream work:

• Modular Cloud Explorer — contract verification & explorer improvements

  • PRs: https://github.com/modularcloud/explorer/pulls?q=is%3Apr+is%3Aclosed+author%3Apynchmeister

• Beanstalk Farms / Basin — DeFi primitives and testing

  • PRs: https://github.com/BeanstalkFarms/Basin/pulls?q=is%3Apr+is%3Aclosed+author%3Apynchmeister

I also maintain and experiment with:

• yul-greatest-hits — low-level EVM/Yul R&D
• vyper-greatest-hits — Vyper contract experiments
• huff-examples-foundry — Huff patterns and examples in a Foundry workspace

I’ve taught 30+ students how to build secure, real-world blockchain systems:

• Custom Solidity & EVM internals curriculum
• Smart contract security, threat modeling, and audit prep
• Foundry, Hardhat, invariant testing, and fuzzing
• Modular rollups, DA layers, and next-gen L1/L2 architectures

I care deeply about decentralized education and making advanced protocol concepts accessible.

I’m open to:

• Smart Contract Engineer / Protocol Engineer roles
• Blockchain Infra / Rollups / DA teams
• DeFi / NFT protocol engineering
• Developer tooling and explorer/verification infra
• Collaborating on DED and decentralized education primitives

• GitHub: https://github.com/pynchmeister
• Email: acyclicgraphs@gmail.com
• LinkedIn: https://www.linkedin.com/in/harris-levine-486191164

If you’re building modular infrastructure, next-gen protocols, or decentralized education systems, I’d love to talk.