Quark Wei

Summary

Senior backend and crypto engineer with hands on experience building blockchain wallet infrastructure and leading a 6 person engineering team. Strongest in C# and TypeScript, with recent work in Elixir and Rust. Focused on wallet infrastructure, coin integrations, and secure, reliable backends for production and privacy sensitive systems.

Technical Strengths

Languages
C# TypeScript Elixir Python Rust SQL Scala
Backend and data
Phoenix Ash PostgreSQL Stored procedures
APIs and integrations
RESTful JSON RPC gRPC GraphQL Blockchain integrations
Crypto and wallets
Bitcoin Ethereum ERC20s Blockchain wallet infrastructure Fee optimization Transaction batching Travel Rule/TRUST
Other
Azure Pipelines CI/CD SOC 2 Compliance

AI-Assisted Engineering

  • Developed a parallel AI-assisted workflow using acceptance criteria scaffolding, TDD, isolated git worktrees with dev deployment over Tailscale, and independent agent review to make concurrent changes faster and safer.

  • Built VM infrastructure for safer AI-assisted development by provisioning freshly bootstrapped dev environments, safely synchronizing repositories, and maintaining data isolation between VMs while sharing common infrastructure.

  • Greatly improved AI agents' speed and success when creating and modifying 3D models of complex functional parts by creating a build123d skill that encodes parametric CAD principles, reusable 3D primitives, design best practices for 3D printing, and deterministic geometry validation.

Experience

Voice coaching startup

Founder & Software Engineer

to Present
  • Designed and implemented a privacy-sensitive coaching platform in Phoenix LiveView, Ash, and PostgreSQL with multitenant authorization, Google OAuth, coaching workflows, immutable client records and document revisions, consent revocation, and fail-closed privacy boundaries.

  • Built a differentiable Rust vocal fold physics simulation for performing inference from recorded speech to vocal tract kinematics.

Bittrex

Lead Engineer, Wallet Team

to Spring 2024

SDE II, Wallet Team

to
  • Managed and served as technical lead for a 6 person wallet engineering team hiring four engineers and coordinating C#, TypeScript, and Wallet Operations teams supporting more than 100 assets.

  • Increased asset onboarding throughput 24× by building a generic C# worker and a standard REST contract for TypeScript adapters that normalized JSON RPC, gRPC, GraphQL, and REST blockchain interfaces, plus automated integration testing for our coin integrations and workers.

  • Personally implemented roughly 20 end-to-end coin and token integrations including encrypted key storage and retrieval, transaction construction and signing, deposit and withdrawal lifecycles, detecting confirmations and reorganizations, ledger reconciliation, retries with backoff, and health checks.

  • Implemented the Solana integration including node infrastructure and worker performance improvements for chain throughput; reviewed ERC20 contracts and other proposed assets for integration and listing risk.

  • Reduced a worst case blockchain ledger reconciliation backfill from more than one year to two days by batching and parallelizing blockchain, API, and SQL workloads and improving the efficiency of our workers.

  • Led Bittrex's integration with the TRUST network designing the internal architecture and coordinating with other exchanges for interoperability testing for Travel Rule compliance.

  • Overhauled production deployment controls for SOC 2 adding authorization and access restrictions, CI/CD governance, and rollback procedures through Azure Pipelines.

Amazon FinTech

Software Development Engineer

to
  • Built daily Scala and Spark SQL pipelines on AWS EMR for retail financial reporting, giving finance leadership visibility within days instead of waiting for the following month's accounting close.

  • Received an organization-wide “Needle Mover” award within four months for work on a modular, configurable financial data pipeline.

  • Reduced AWS EMR spend by approximately $6,000 per month through more efficient cluster acquisition and shutdown; cut backfill runtime 10× by parallelizing processing.

Selected Work

Karabiner Elements

Open-source contribution

  • Built configurable palm detection that turns palm contact into an additional modifier or function key for system-wide shortcuts such as Vim-style navigation.

  • Fixed a longstanding event-system bug so built-in trackpad clicks could release sticky modifiers without duplicating clicks or forwarding raw pointer movement.

Arkmo

Team project

  • Team project awarded the $4,000 Bitcamp 2018 blockchain prize for an ARK-based recipient-verification transaction flow.

Education

Virginia Commonwealth University

Bachelor of Science in Computer Science, Magna Cum Laude

to

Thomas Jefferson High School for Science and Technology