z
zimmern_zhao

yu zhao

@zimmern_zhao

Java and Python Developer, APIs, Automation and Data

China
Chinese
About me
Hi! I'm a software developer with a Java and enterprise background, helping clients build reliable backends and automate repetitive work. What I do best: ☕ Java & Spring Boot — REST APIs, bug fixes, backend dev 🐍 Python automation — Excel, CSV cleaning, reports 🗄️ Data processing — clean, merge, analyze your data Why work with me: I take responsibility — if it breaks, I fix it Free testing on your sample files first Clean, commented code you can re-run anytime Quick replies, usually within 1 hour Let's get it done.... Read more

Skills

z
zimmern_zhao
yu zhao
Offline • 
Average response time: 1 hour

See my services

Scripting
I will automate your excel and csv tasks using python script
From$20 / projectMore details
Translation
I will provide professional native english to simplified chinese translation
From$5 / projectMore details

Portfolio

Work experience

Self_Employed

Java Developer - WeChat Mini-Program

Self Employed • Part-time

Oct 2024 - Present • 1 yr 9 mos

Developed WeChat Mini-Program features for business clients as a freelance developer. Built practical office functions including meeting minutes, staff check-in/attendance, and approval workflows. Experienced in turning real business requirements into clean, working software.

Freelance_Web Designer

Freelance Python Automation Developer

Freelance Web Designer • Self-employed

Dec 2024 - Apr 2026 • 1 yr 4 mos

Built custom Python automation tools for small businesses and freelance clients. Specialties include multi-sheet Excel report generation, large-scale file organization, CSV data cleaning, and workflow automation. Delivered 6+ production-ready projects saving clients 10+ hours per week.

Java Developer - ERP Systems

Factory • Full-time

Dec 2017 - Aug 2024 • 6 yrs 8 mos

Designed and developed enterprise ERP systems for a textile manufacturing company over 6 years. Built and maintained core modules including HR, finance, and logistics management. Responsibilities covered backend development with Java, database design, business logic implementation, and system maintenance for daily production use. Focused on building reliable, maintainable systems for real business operations.