Huaheng (Erik) Yu

• Architecture & Deployment: Designed and implemented a stateless microservices architecture integrated with event-driven systems and serverless functions on AWS, enabling automated 10x scalability from a baseline of ~1k DAU.
• Hands-on 0-to-1 Delivery: Led the team to launch multiple projects on multiple platforms (web, rn, smart contracts) from concept to production, meeting deadlines and quality targets.
• Engineering Infrastructure: Built GitHub Actions + Terraform pipelines enabling isolated environments from any feature branch within 3 minutes, significantly enhancing parallel feature testing.
• Efficiency Improvement: Led the integration of Langfuse, Dify, and LiteLLM for configurable AI model orchestration, centrally managing 50+ prompts and 100+ variables; reduced prompt iteration cycles from 2 days to 5 minutes.
• Team Building: Established and managed a 10-member engineering team, implemented hiring standards, performance reviews, and regular 1:1 mentoring, achieving zero attrition among core members.

• Frontend Lead: Spearheaded the creation of KYB merchant onboarding platform from scratch to launch within 6 weeks, replacing manual workflows with automated data collection and ML-driven review, coordinating multiple functional teams across four time zones.
• Engineering Efficiency: Transformed jsonrpc4j-jsonSchema to jsonrpc4j-to-TS, automating TypeScript API generation for over 10 risk services, reducing interface integration time from hours to about 10 minutes.
• Engineering Standardization: Integrated 10+ applications into a pnpm monorepo; implemented OpenTelemetry for 5+ Node.js services connecting traces to NewRelic, streamlining Java and Node.js system observability.

• Monorepo Upgrade: Led migration of TikTok frontend monorepo (a 100+ engineer allover the world) from yarn + lerna to pnpm + rush, designing phased transitions, implicit dependency scanning, and automated PR bots; reduced build time from ~20 min to <5 min (75% improvement) for major projects, cutting onboarding time in half.
• Build Efficiency Optimization: Developed Rush Cache integrated with internal build platform for distributed caching and real-time CI monitoring, significantly reducing pipeline duration and failure rates.
• Micro-Frontend Governance: Implemented unified SSO, permission systems, logging, and RPC channels, creating plug-and-play scaffolding frameworks for 10+ mid-to-large scale backend applications.
• Open Source Contributions: Authored and reviewed over 80% of pnpm Chinese documentation, pnpm official collaborator, continually promoting internal best practices externally.

• Full-Stack Development: Managed daily development, troubleshooting, and performance monitoring of ICY App's backend and frontend operations.
• API Refactoring: Improved complex product listing APIs using builder patterns, significantly enhancing response time and query reliability.
• Engineering Standards: Implemented commitizen guidelines, standardized JS coding practices, and streamlined internal API parameters, improving collaboration efficiency and traceability.

Languages

Primary: TypeScript (extensive production experience), familiar with Golang, Python, Solidity, Java, PHP, C/C++

Backend

Node.js, Golang RESTful services, databases (MySQL, ClickHouse, Redis, Elasticsearch), Nginx reverse proxying and load balancing

Frontend

React (Hooks, Next.js), custom component libraries (Element Plus, Material-UI), visualization with ECharts and GoJS

DevOps & Engineering

Monorepo management (pnpm + Rush), Webpack, CI/CD with GitHub Actions, GitLab CI, Docker, Terraform, AWS fundamentals, observability with OpenTelemetry