Hi, I'm Erichain!

A self-built end-to-end iOS automated release workflow system, abstracted from a complete Agentic workflow forged while building Elo. The agent autonomously handles requirements breakdown, TDD code generation, simulator testing, Archive packaging, TestFlight uploads, and more — backed by a RAG knowledge base that continuously learns my coding style and historical docs.

• Owned the agent architecture: built a state-machine orchestration layer with TypeScript + LangGraph.js, combined with Hermes Agent and the Xcode MCP, delivering a closed-loop pipeline of natural language → task breakdown → TDD code generation → automated testing;
• Introduced RAG: built a project knowledge base on LlamaIndex.js + Chroma, continuously fed with code style and historical documentation so the agent understands and follows personal development conventions;
• Shipped fully automated end-to-end releases: integrated Fastlane and Playwright to cover simulator testing, Archive packaging, TestFlight uploads, automated handling of Compliance web forms, and on-device distribution — with a human-in-the-loop confirmation mechanism.

A women's whole-life-cycle tracking App (in development) covering period prediction, fertility planning, and perimenopause tracking — combined with women's health education and TCM-inspired dietary recommendations.

• Drove all pre-development groundwork: tech stack selection, UI design, PRD, and product roadmap.
• Independently built 80% of the app's features, including Apple Watch and widget support.

1Prompt is an all-in-one AI prompts managing platform built for creating, testing, and version-controlling prompts. It can help users streamline how they manage and ship generative AI prompts at scale. Gained early traction with hundreds of real users before operations were put on hold due to funding.

• Owned the full product lifecycle end-to-end, including product design, UI design, and project architecture design.
• Wrote, tested, and shipped all frontend and backend code independently.
• Integrated LLM APIs across multiple providers (domestic and international) to power real-time prompt testing.
• Integrated Stripe for smooth payment flow.

BewildAI helps users in China subscribe to top-tier overseas AI services such as Claude and ChatGPT. After a year of stable operation, it now serves a user base of around 500K.

• Owned development and maintenance of the core AI subscription service, supporting a user base of 500K+.
• Led the end-to-end rollout of AI-driven development workflows across the project, covering requirements refinement, task breakdown, implementation, review, testing, and CI.
• Built a Node.js frontend log reporting service on top of Loki, cutting issue investigation time by 60%+.
• Adopted TDD alongside AI-assisted coding, achieving 80%+ AI-generated code in production with 70%+ unit test coverage maintained throughout.
• Introduced spec-driven development (SDD), enabling 70% of features to be scoped and built from a single prompt with no rework.
• Established and enforced team-wide standards across AI documentation, engineering practices, and Harness Engineering.

LearnAbout is an AI knowledge encyclopedia Q&A product purpose-built for the education sector (built on React Router v7 / Remix). Users can explore any topic from a single sentence question and progressively dive deeper, with multimodal multi-turn interactions including video and image responses.

• Led the build of a multimodal AI conversation flow supporting both image and text generation, along with complex multi-turn interactions;
• Delivered smooth, polished UI animations and transitions throughout the experience.

A logistics platform purpose-built for pharmaceutical and cold-chain transportation, covering the full chain from order intake, route planning, vehicle scheduling, in-transit monitoring, and exception handling to settlement and reporting — integrated with Amap for trajectory tracking and geofencing.

• Owned mid/back-office development of the Haichuan TMS (Transportation Management) and OMS (Order Management) systems;
• Built reusable foundations to support fast iteration: abstracted list and form components on top of ProTable / ProForm, and accelerated delivery with keep-alive and OpenAPI-based automated API generation.

A mobile-only user research product with rich, configuration-driven question flows and animated interactions, covering nearly 300 question sub-pages including single-choice, multi-choice, and image-selection questions.

• Abstracted an atomic-level components library within a short time, doubling page delivery efficiency and successfully supporting the game's rapid launch;
• Handled audio/video compatibility across multiple mobile browsers, including various phone brands and in-app browsers such as WeChat and QQ etc.;
• Reduced static asset load time by 45% by building an automated FFmpeg optimization script pipeline.

A mobile work platform built for service providers in the home renovation industry, connecting them directly with client requirements and renovation workflows.

• Led app architecture setup, built reusable component library, and designed the data flow architecture;
• Collaborated with the backend team to design and implement a flexible, generalized approval workflow system, eliminating 40%+ of duplicated code.

A mini-program tailored to the ACG (anime, comics, games) community, offering trending convention info, check-ins, and stamp-collection features.

• Owned data model design and core feature development across both the admin platform and the mini-program, covering modules like authentication and payments;
• Unified development across a NestJS backend, Vue admin panel, and UniApp mini-program in a single repo, extracting 10+ shared packages including hooks, payment, and database utilities.

An internal goal-setting and alignment system for Meituan employees, designed to solve cross-level and cross-team goal coordination.

• Led the frontend architecture design based on Redux + Context + Hooks, supporting complex interactions and state management across the system;
• Built a shared Hooks library and reusable business components integrated with backend APIs, enabling plug-and-play usage across the team;
• Solved complex interaction challenges within deeply nested data structures, including inline editing (onFocus/onBlur) and dynamic list rendering;
• Rolled out across the entire Waimai business unit, supporting ~20,000 OKR entries and receiving strong recognition from stakeholders.

A B2B admin platform for Meituan Waimai's Kuailv (B2B grocery sourcing) business, serving operations, finance, and customer support teams across products, stores, orders, campaigns, and reporting/reconciliation.

• Owned frontend development of the CRM operations console for Meituan Waimai's Kuailv B2B business;
• Led the visualization and large-scale async Excel export pipeline for the financial reporting and reconciliation modules, balancing requirements from finance and operations;
• Built a React + Webpack frontend/backend-separated scaffold and Mock system, unifying development standards and release processes across multiple business lines.

• Led the design and development of a unified frontend toolchain adopted by the team;
• Integrated a custom build system and third-party error monitoring; established code and development standards;
• Achieved 60% team-wide project adoption with 30+ iterative releases;
• Reduced new project setup time to under 1 minute; new team members can get familiar with projects at no cost.