Hi, I'm David

Smart contract & backend engineer. I build ERC-4337 account abstraction wallets, after a decade shipping wallets, bridges and systems software.

Richmond, BC, Canada

About

With over 9 years of experience in software development, I specialize in blockchain technology and backend development. At Elytro, I focus on advancing the capabilities of ERC-4337 account abstraction wallets and backend services using Node.js and TypeScript. My mission is to create secure, efficient, and scalable solutions that align with Elytro's innovative goals in decentralized technology. I value collaboration and continuous improvement, bringing diverse perspectives and a commitment to technical excellence to our team.

At Elytro, I contributed to the development of cutting-edge ERC-4337 wallet contracts and backend services. By optimizing gas usage and conducting rigorous security audits, I helped enhance contract efficiency and reliability. My work is rooted in technical precision and collaboration, ensuring that the solutions we deliver meet the highest standards of performance and security.

Experience

Smart Contract & Backend developer
Elytro (prev. Soul Wallet) · Permanent
Jun 2023 – Aug 2026 · 3 yrs 3 mos
- Developed ERC-4337 Account Abstraction smart wallet contracts for Elytro Wallet.
- Designed and implemented wallet backend services using Node.js (Express) and PostgreSQL.
- Built wallet business logic including account management, transaction workflows, and blockchain interaction.
- Led the implementation of Social Recovery by leveraging Ethereum L1 KeyStore, Merkle Patricia Trie (MPT) state proofs, and L1-to-L2 state synchronization to enable secure recovery across multiple Layer 2 networks.
- Collaborated on beta releases, smart contract testing, security reviews, and gas optimization.
Software Developer
RioDeFi
Oct 2020 – Jun 2023 · 2 yrs 9 mos
- Developed a custodial cross-chain bridge connecting external blockchains with the RioChain ecosystem.
- Built an exchange-style deposit monitoring service using per-user BIP-39 HD wallet addresses generated through Hex Trust.
- Implemented backend services to verify blockchain deposits and trigger asset minting on RioChain.
- Developed a permissioned relayer responsible for securely authorizing cross-chain mint operations.
- Built wallet functionality for the Polkadot ecosystem, including blockchain interaction and asset management
Software Engineer
VeChain Tech 唯链科技
Nov 2017 – Mar 2020 · 2 yrs 5 mos
Shanghai, China
- Developed the VeChain mobile wallet, implementing blockchain transaction workflows and wallet management features.
- Built enterprise Blockchain-as-a-Service (BaaS) backend services using Node.js and Express.
- Implemented backend business logic for blockchain-powered product traceability solutions.
- Designed RESTful APIs enabling enterprise customers to manage SKU information and query blockchain provenance data.
- Collaborated with blockchain and frontend teams to integrate on-chain and off-chain business workflows.
developer
Huawei Technologies
Mar 2016 – Nov 2017 · 1 yr 9 mos
Shanghai, China
- Developed Linux low-level storage software for SCSI and UFS subsystems.
- Implemented bootloader functionality based on hardware specifications and storage protocol requirements.
- Designed and executed storage subsystem test cases.
- Collaborated with firmware and hardware teams to debug low-level storage initialization and performance issues.
Mobile Application Developer
Wazombi Labs
Jul 2014 – Sep 2015 · 1 yr 3 mos
tartu
- responsible for developing Android and iOS client application using Xamarin framework

Education

University of Tartu
2013 – 2015
Master's, Computer Software Engineering
Metropolia University of Applied Sciences
2011 – 2012
Bachelor's, Computer Software Engineering (exchange year)