You will get Perform high-performance backend audit and optimization for Java/Go
Project details
Backend performance issues are hidden revenue killers. With 8+ years of experience in high-concurrency Java and Go systems, I specialize in finding the 'hidden killers' of performance that standard developers miss.
I don't just 'make it work'—I architect it for scale. Whether you're dealing with memory leaks, database contention, or inefficient API endpoints, I provide production-grade, code-level solutions that drive efficiency. I bring an MBA-level understanding of ROI to my technical work, ensuring that every optimization directly impacts your business metrics.
My approach is transparent, architectural, and data-driven. Let's optimize your infrastructure for 10M+ users.
I don't just 'make it work'—I architect it for scale. Whether you're dealing with memory leaks, database contention, or inefficient API endpoints, I provide production-grade, code-level solutions that drive efficiency. I bring an MBA-level understanding of ROI to my technical work, ensuring that every optimization directly impacts your business metrics.
My approach is transparent, architectural, and data-driven. Let's optimize your infrastructure for 10M+ users.
Programming Languages
Python, Java, GoCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$195
|
Standard
$495
|
Advanced
$995
|
|---|---|---|---|
| Delivery Time | 1 day | 5 days | 7 days |
Number of Revisions | 1 | 2 | Unlimited |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$100 - $200
Additional Revision
+$50
Extra Architecture Review
+$100Frequently asked questions
About Fei
Python Web Scraping & API Automation | Java Backend Engineer
Guiyang, China - 11:36 am local time
API integrations, bug fixes, and browser-side data tools—with clear milestones
and async updates (no unnecessary calls).
What I deliver:
• Python: Playwright/Selenium scrapers, FastAPI endpoints, CSV/JSON pipelines, automation scripts
• Java: Spring Boot APIs, maintenance, integration work
• Live browser tools (paste-only, no upload): site1-jsonlint.pages.dev · site2-csvtojson.pages.dev
Recent build: keyword radar + Reddit filter pipeline (Python/FastAPI/React) —
see Portfolio.
How I reduce your risk on Upwork:
• Milestone 1 = small verifiable output in 48h (sample file, API call log, or passing test)
• Short Loom walk-through when scope is non-trivial
• GitHub + README on request
Fixed-price $150–500 for defined scopes; hourly for ongoing maintenance.
Message me with your repo, target URLs, or API docs—I’ll reply with a
concrete first step.
Steps for completing your project
After purchasing the project, send requirements so Fei can start the project.
Delivery time starts when Fei receives requirements from you.
Fei works on your project following the steps below.
Revisions may occur after the delivery date.
Architecture & Log Audit
I will perform a deep analysis of your current backend architecture and review your performance logs to pinpoint the root causes of bottlenecks.
Implementation & Refactoring
I will apply code-level optimizations to your critical endpoints and perform necessary refactoring for better concurrency.