Levi XiaFullstack Software Engineer
Building systems through calculated decisions.
Every architecture tells a story of trade-offs.
I don't just write code.
I solve constraints.
Good engineering isn't about using the newest framework. It's about understanding the problem deeply enough to choose the right trade-offs.
Constraint-Driven
Every system has limits. I find them first, then architect around them.
Decision Trees
Document the "why" behind every technical choice. Future you will thank you.
Layered Thinking
Build abstractions that make complexity manageable, not invisible.
System Overview
A comprehensive view of the technologies and patterns I work with most frequently.Click a node to filter projects by technology →
Technology Constellation
Core Principles
- →Simplicity over complexity
- →Explicit over implicit
- →Measure everything
Preferred Patterns
- →Event-driven architecture
- →CQRS for complex domains
- →Feature flags for safe deploys
Anti-Patterns I Avoid
- ✗Premature optimization
- ✗Shared mutable state
- ✗"Just add a cache" solutions
Project Gallery
Systems built through calculated decisions. Click to explore the complete decision trail.
Warehouse Management System
Magic Custom Inc. | Fullstack Software Engineer
Designed and deployed a from-scratch WMS to automate real-time tracking of ~1K SKUs across 4 warehouses, moving from manual processes to a fully automated AWS-backed infrastructure.
Real-Time Media Discovery & Booking Engine
Mirastrom Inc. | Founding Frontend Engineer
Developed a dual-platform ecosystem (React Native Mobile / React Admin) for photographers and models, featuring an AI-driven ranking engine and real-time availability synchronization.
Order Fulfillment Pipeline Optimization
Missfresh Ltd. | Backend Engineering Intern
During a technical internship, I refactored critical segments of the notification and fulfillment backend to handle massive traffic spikes, successfully compressing end-to-end latency for 53k daily orders.
Side Projects
Quick experiments and tools built to scratch an itch.
Architected an event-driven system to synthesize live Sportradar TCP feeds with market odd-swings, using multi-agent AI to identify arbitrage in <250ms.