You will get Fix a Java / Spring Boot bug
Project details
I will investigate and fix one Java/Spring Boot backend bug (API errors, exceptions, wrong business logic, or integration issues). You’ll get a tested fix plus a short root-cause summary and clear notes on what changed, so you can deploy safely and avoid the issue recurring.
Programming Languages
JavaScript, JavaCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included $50
These options are included with the project scope.
$50
- Delivery Time 1 day
- Number of Revisions 1
- Bug Investigation
- Fix Documentation
About Thanh
Fullstack Java Developer | Spring Boot, React, Flutter | 8+ Years
Ho Chi Minh City, Vietnam - 3:17 am local time
and SaaS products — from security monitoring platforms to mobile apps
and cloud POS systems.
WHAT I DO BEST:
• Backend: Java, Spring Boot 3, Vert.x, REST API, MongoDB, Elasticsearch
• Frontend: React, Vue.js, Flutter (iOS/Android)
• DevOps: AWS (S3, CloudFront, EC2), Docker, GitHub Actions CI/CD
• Integrations: PayPal, Firebase, OAuth2, WebSocket real-time
RECENT WORK:
• Built a live SaaS POS system (React + Spring Boot + MongoDB) — deployed
on AWS with CI/CD, billing, multi-branch support
• Fullstack developer on a digital business card & HR platform (Flutter +
Spring Boot + React) with payment integration
• 4+ years on an enterprise SIEM/security monitoring platform (Java/Vert.x,
Elasticsearch, Vue.js) with 15+ micro-modules
I recently launched my own SaaS product solo, using AI-assisted development
to move fast without sacrificing quality. I understand the full product
lifecycle — from architecture to deployment to user-facing features.
My latest work is a live cloud POS SaaS (“Sổ thu chi”) — built solo from architecture to AWS deployment, with billing, multi-branch, and i18n.
TOEIC 750 | Available for hourly and fixed-price projects
Let's discuss your project!
Steps for completing your project
After purchasing the project, send requirements so Thanh can start the project.
Delivery time starts when Thanh receives requirements from you.
Thanh works on your project following the steps below.
Revisions may occur after the delivery date.
Analyze the issue (logs, reproduce steps, environment).
Implement the fix and run tests / verify behavior.