You will get a Spring Boot bug fix and performance optimization
Project details
Is your Spring Boot application throwing errors?
running slow, or behaving unexpectedly in production?
I will diagnose the root cause, fix the issue, and
Make sure it does not come back.
With 7+ years of Java and Spring Boot experience
across logistics, food delivery, and enterprise
systems — I have seen and fixed almost every type
of a backend issue. I do not just patch symptoms,
I fix root causes.
What you will get:
• Full diagnosis and root cause analysis
• Fix for bugs based on the selected tier
• Performance optimization if relevant
• Brief code review and improvement suggestions
• Clear explanation of what was fixed and why
• Communication throughout the process
Share your error logs or describe the issue —
I will tell you if I can fix it before you pay.
100% Job Success Score on Upwork.
running slow, or behaving unexpectedly in production?
I will diagnose the root cause, fix the issue, and
Make sure it does not come back.
With 7+ years of Java and Spring Boot experience
across logistics, food delivery, and enterprise
systems — I have seen and fixed almost every type
of a backend issue. I do not just patch symptoms,
I fix root causes.
What you will get:
• Full diagnosis and root cause analysis
• Fix for bugs based on the selected tier
• Performance optimization if relevant
• Brief code review and improvement suggestions
• Clear explanation of what was fixed and why
• Communication throughout the process
Share your error logs or describe the issue —
I will tell you if I can fix it before you pay.
100% Job Success Score on Upwork.
Programming Languages
JavaCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$100
|
Standard
$150
|
Advanced
$250
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 3 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 1 | 1 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$50 - $100Frequently asked questions
11 reviews
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AF
Adama F.
Jul 27, 2026
Java Tutor/classes for Beginner -Aicha
I am truly grateful for the outstanding support and instruction Shahbaz has provided as my daughter's Java tutor/teacher. From the very beginning, he has been incredibly patient, professional, respectful, and consistently punctual. His depth of knowledge is exceptional, and it's clear that he has mastered the subject. He follows the curriculum thoroughly while making each lesson engaging and easy to understand. Over the past few months, my daughter has learned so much that I am genuinely amazed by her progress. She has grown in both her knowledge and confidence, and she is now preparing to earn her Full Stack Java certification. Even more exciting, she will be able to receive college credit for this course as she returns to school in August to continue her engineering degree. That opportunity alone has made this experience even more valuable. What impressed us most was how comfortable and motivated Shahbaz made my daughter feel from the very first trial session. She enjoyed learning with him immediately, and that enthusiasm has only continued to grow throughout the course. I highly recommend Shahbaz to anyone looking for an exceptional Java tutor or instructor or IT projects. . His expertise, dedication, and ability to teach effectively make him an outstanding project leader. I would confidently recommend him for any teaching or technical project, and we are already looking forward to working with him again on future projects. Thank you, Shahbaz, for your dedication and for making such a meaningful impact on my daughter's educational journey.
Cheers
Adama
Cheers
Adama
DM
David M.
Jun 4, 2026
SQL Pro
Shahbaz was easy to work with. He provided his knowledge of SQL and helped with all questions asked. I recommend him.
WL
Wayne L.
Mar 26, 2026
SQL Database Conversion from 2022 back to 2019
Thanks Shahbaz!
MD
Max D.
Mar 24, 2026
Mom's Deli - Full Stack Deployment
I highly recommend Shahbaz if you need his help. He is a well-rounded software engineer who understands the technical challenges you will be facing. Other than that, he also does an excellent job of explaining how things work.
VY
Vishnu Y.
Jan 14, 2026
Java Spring Boot API's and API integration with React
About Shahbaz
Full Stack Java Engineer | Spring Boot | React | AWS | AI APIs
91%
Job Success
Hyderabad, Pakistan - 12:41 am local time
building scalable, production-grade systems for logistics,
food delivery, and enterprise platforms.
I specialize in Spring Boot microservices architecture
and AI-powered backend systems — designing end-to-end
solutions that handle high traffic, complex workflows,
and real-time data processing. My background in logistics
technology means I understand not just the code, but the
business operations behind it.
What I bring to your project:
- AI integration using OpenAI, Gemini, and LangChain4j
for intelligent automation and chatbot backends
- Microservices architecture with Spring Boot and Spring Cloud
- Event-driven systems using Apache Kafka and RabbitMQ
- Full stack development with React.js and Vue.js frontends
- REST API design, development, and third-party integrations
- AWS infrastructure — EC2, RDS, S3, deployment pipelines
- Database design and optimization across MySQL, PostgreSQL,
and Oracle
- JWT-based authentication and Spring Security
- Legacy system migrations and monolith-to-microservices
transitions
- Docker, CI/CD pipelines, and production deployment
I have built and maintained systems processing hundreds of
thousands of records daily — including a 2.5-year long-term
engagement delivering a full-stack logistics and food delivery
platform on AWS, earning a 5.0 rating across every review.
I do not disappear after handing over code. I ask the right
questions before starting, communicate clearly throughout,
and flag issues before they become problems. Clients who
work with me once tend to come back.
100% Job Success Score across every contract on Upwork.
If you need a reliable full-stack engineer who builds
intelligent, scalable systems — let's talk.
Steps for completing your project
After purchasing the project, send requirements so Shahbaz can start the project.
Delivery time starts when Shahbaz receives requirements from you.
Shahbaz works on your project following the steps below.
Revisions may occur after the delivery date.
Step
Review your code, error logs, and reproduce the issue
Step
Diagnose the root cause and share findings with you