shizhigu (Shizhi)

Backend Developer | Python/FastAPI | AI Integration

Backend developer with Python/FastAPI expertise building B2B SaaS products. Demonstrates end-to-end product delivery with AI integrations and modern cloud deployments. Learning trajectory shows progression from Go microservices fundamentals (2020) to production-ready AI-powered applications (2025).

5,649
Total LOC
14
Commits
3
Active Repos
5yrs
Experience

Career Signal Dashboard

Evidence-Based Assessment

Code Statistics

D3.js Visualization

Lines of Code by Repository

Commit Distribution

Technology Stack

Skills Matrix

Primary Language

Python

Learning

Go

Frameworks

FastAPI SQLAlchemy Pydantic go-micro

Databases

PostgreSQL DuckDB MotherDuck

AI & Integrations

OpenAI/GPT-4 Clerk Auth Resend Email LangChain

Infrastructure

Docker Railway Render Fly.io

Growth Trajectory

5-Year Progression

Skills Evolution Timeline

2020
Go Microservices
Started with Go microservices fundamentals using go-micro, gRPC, and Protocol Buffers. Built a 3-component microservices stack.
2020-2024
Backend Mastery
Deepened Python expertise with FastAPI, SQLAlchemy, and PostgreSQL. Multi-tenant SaaS patterns and clean architecture.
2025
AI Integration Era
Adopted modern AI stack: GPT-4o-mini, LangChain loaders, document processing pipelines. Full-stack AI-powered applications.

Complexity Score Over Time

Projects

Deep Dive

Assessment

Honest Evaluation

Strengths

◆ Full-stack backend development with FastAPI ecosystem
◆ AI/LLM integration for document processing and generation
◆ Clean architecture and code organization
◆ Multi-tenant SaaS patterns
◆ Quick prototyping and solo delivery

Growth Areas

! Automated testing (no tests in any repo)
! CI/CD pipelines (none configured)
! Production hardening (rate limiting, caching, task queues)
! Team collaboration (all solo projects)