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Khalifatur R.

Khalifatur R.

Java & Spring Boot Backend Developer | REST APIs Microservices MySql

Need a backend that's fast, reliable, and built to scale? I help businesses design and build robust backend systems using Java and Spring Boot so your application runs smoothly and your team can focus on growth. With 3 years of hands-on experience, I've worked on RESTful API development, third-party integrations, and clean backend architectures for modern web applications. I write maintainable, well-documented code and communicate clearly throughout every project. What I can help you with: - Backend Development with Java & Spring Boot - Building & optimizing REST APIs - Third-party API integration - Database design & query optimization (MySQL / PostgreSQL) - Microservices architecture implementation - Debugging, fixing & improving existing backend systems - Performance tuning & system scalability - Fullstack web application development I treat every project as if it's my own clean code, on-time delivery, and clear communication are non-negotiable for me. If you need a reliable backend developer who gets things done right, let's talk.

🇮🇩Tangerang, Indonesia$9/hr95% JSSSince Jan 2017

Earnings and projects

MRR
$288

Last 6 months ÷ 3.3 months active (since Jul 2026)

World#99,899 / 412k
🇮🇩Country#1,422 / 5,725
Revenue, last 30 days
$0

Last 6 months: $947

Total earnings
$957

Billed in all: $1.1k

World#397,485 / 412k
🇮🇩Country#5,560 / 5,725
Per project
$957

$947 in the last 6 months

World#127,322 / 412k
🇮🇩Country#1,261 / 5,725
Projects, last 6 months
1

Across 2 contracts

100% fixed0% hourly
World#128,092 / 412k
🇮🇩Country#2,283 / 5,725
Projects in all
1

Across 2 contracts

100% fixed0% hourly
World#360,671 / 412k
🇮🇩Country#5,145 / 5,725

Earnings, last 30 days

$1.1kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$1,040$1,060$1,080$1,100Oct 8Oct 23Nov 7

Skill rankings: Top 10% in Spring MVC

Ranked by MRR among everyone on Upwork with the skill.

  1. #25Spring MVC243 freelancers · 🇮🇩 #1Top 10%
  2. #371Spring Boot2,150 freelancers · 🇮🇩 #9Top 17%
  3. #817CI/CD3,691 freelancers · 🇮🇩 #21Top 22%
  4. #1,397Java8,313 freelancers · 🇮🇩 #27Top 17%
  5. #1,854Docker8,761 freelancers · 🇮🇩 #38Top 21%
  6. #2,641SQL12,903 freelancers · 🇮🇩 #28Top 20%
  7. #4,936PHP24,835 freelancers · 🇮🇩 #70Top 20%
  8. #6,210Web Development25,055 freelancers · 🇮🇩 #74Top 25%