You will get Java Spring Boot REST API, Production Ready & Scalable
Project details
I've built Java Spring Boot APIs for some of Indonesia's largest banks —
Maybank, Bank Mandiri, CIMB Niaga, and Bank BTPN — handling 1,200+
transactions per minute with 99.97% uptime and sub-150ms P95 latency.
This isn't tutorial-level code. Every API I deliver is production-grade:
proper error handling, security layers, clean architecture, and
documented endpoints you can hand off to any developer.
What sets this apart:
• Real fintech experience: I've solved the exact problems your API will face
at scale — race conditions, slow queries, auth edge cases, and high concurrency.
• Clean, maintainable code: Structured with separation of concerns, so your
team can extend it without rewriting everything.
• Fast delivery: I work efficiently because I've built this stack hundreds of
times. No guesswork, no back-and-forth learning curve.
• Full documentation: Postman collection + inline comments included in all tiers.
Whether you're a startup building your first backend or a business replacing
a broken legacy API, I'll deliver something you're proud to ship.
Maybank, Bank Mandiri, CIMB Niaga, and Bank BTPN — handling 1,200+
transactions per minute with 99.97% uptime and sub-150ms P95 latency.
This isn't tutorial-level code. Every API I deliver is production-grade:
proper error handling, security layers, clean architecture, and
documented endpoints you can hand off to any developer.
What sets this apart:
• Real fintech experience: I've solved the exact problems your API will face
at scale — race conditions, slow queries, auth edge cases, and high concurrency.
• Clean, maintainable code: Structured with separation of concerns, so your
team can extend it without rewriting everything.
• Fast delivery: I work efficiently because I've built this stack hundreds of
times. No guesswork, no back-and-forth learning curve.
• Full documentation: Postman collection + inline comments included in all tiers.
Whether you're a startup building your first backend or a business replacing
a broken legacy API, I'll deliver something you're proud to ship.
Programming Languages
JavaCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$300
|
Advanced
$600
|
|---|---|---|---|
| Delivery Time | 4 days | 8 days | 12 days |
Number of Revisions | 2 | 3 | Unlimited |
Design Customization | |||
Content Upload | - | - | |
Responsive Design | - | ||
Source Code |
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CS
Carrie S.
Jul 10, 2026
Next.js, NestJS + PostgresSQL Developers Needed for Project
About Nisa
Senior Java Backend Engineer | Spring Boot, Microservices, Kafka
Tangerang, Indonesia - 4:02 pm local time
I can help with:
• Java 17/21 and Spring Boot REST APIs
• Microservices and event-driven architecture with Kafka
• Legacy Java/JBoss modernization
• PostgreSQL, JPA and Hibernate query optimization
• Spring Security, JWT, OAuth2 and role-based access control
• Payment, banking and financial workflow integrations
• Production debugging, refactoring and automated testing
• Docker, Kubernetes and AWS deployments
I am most useful when a backend has become slow, difficult to maintain, or risky to change. I can investigate the current architecture, identify the actual bottleneck, propose a practical remediation plan, and implement the agreed changes without unnecessary rewrites.
Recent experience includes financial transaction systems, approval workflows, SaaS platforms, real-time dashboards, and multi-service backend modernization.
My deliverables normally include clean source code, automated tests, API documentation, database migration scripts where required, and a clear handover for your engineering team.
Send me the current issue, architecture, or repository context, and I will outline the first investigation steps before we begin.
Steps for completing your project
After purchasing the project, send requirements so Nisa can start the project.
Delivery time starts when Nisa receives requirements from you.
Nisa works on your project following the steps below.
Revisions may occur after the delivery date.
Client purchases and submits requirements form.
Client purchases and submits requirements form.
I review requirements and send a clarification checklist within 12 hours.
I review requirements and send a clarification checklist within 12 hours.