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Marko R.
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Marko R.

Backend & AI Engineer | Java, Spring Boot & API Integrations

I’m a Software Engineer with 4+ years of experience building backend and enterprise applications, primarily with Java and Spring Boot. My experience covers backend development, REST APIs, database design, third-party integrations, workflow automation, and AI/LLM integrations. Core skills: • Java & Spring Boot • Hibernate / JPA • REST APIs & Integrations • PostgreSQL, MySQL & SQL • AI / LLM Integrations • React & TypeScript • Apache Camel • JSON / XML • Git, Maven, Jenkins & CI/CD At Antares Vision Group, I worked on CureSync, a pharmaceutical serialization platform, where I developed backend features, integrations, and solutions for processing large volumes of data. At AIGO, I work on enterprise document management solutions, developing backend services, integrations, reporting features, and workflow automation. I also use tools like Claude and Cursor as part of my development workflow — mainly for exploring unfamiliar codebases, speeding up implementation, and solving technical problems. I’m comfortable joining an existing codebase or building a solution from scratch. I care about writing clean, maintainable code and choosing practical solutions that actually fit the project.

🇭🇷Makarska, Croatia$17/hr100% JSS5.00 (3)Since Oct 2020

Earnings and projects

MRR
$1.1k

Last 6 months ÷ 6

World#45,518 / 412k
🇭🇷Country#79 / 807
Revenue, last 30 days
$2.1k

Last 6 months: $6.4k

World#20,109 / 412k
🇭🇷Country#43 / 807
Total earnings
$6.5k

Billed in all: $6.9k

World#232,310 / 412k
🇭🇷Country#492 / 807
Per project
$931

$3.2k in the last 6 months

World#129,391 / 412k
🇭🇷Country#298 / 807
Projects, last 6 months
2
50% fixed50% hourly
World#88,918 / 412k
🇭🇷Country#136 / 807
Projects in all
7
71% fixed29% hourly
World#236,188 / 412k
🇭🇷Country#514 / 807

Earnings, last 30 days

$6.9k+$2.1k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$4k$6k$8kOct 8Oct 23Nov 7

Skill rankings: #1 in 1 skill of 20

Rarest: top 3% in Apache Camel, of 36. Ranked by MRR among everyone on Upwork with the skill.

  1. 1Apache Camel36 freelancers · 🇭🇷 #1Top 3%
  2. 3Liquibase12 freelancers · 🇭🇷 #1Top 25%
  3. #30Cloud Development165 freelancers · 🇭🇷 #1Top 18%
  4. #73Hibernate677 freelancers · 🇭🇷 #1Top 11%
  5. #125Jenkins1,177 freelancers · 🇭🇷 #2Top 11%
  6. #219Spring Boot2,150 freelancers · 🇭🇷 #1Top 10%
  7. #462CI/CD3,691 freelancers · 🇭🇷 #4Top 13%
  8. #540Large Language Model2,726 freelancers · 🇭🇷 #2Top 20%