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Jonas C.

Jonas C.

Backend Expert | Java/Kotlin | Microservices | Cloud-Native Apps

Backend developer with deep experience designing and integrating distributed systems for media platforms, booking solutions, and low-code environments. Proficient in Java and Kotlin with Spring Boot, and skilled in building cloud-native applications using GKE, Kubernetes, and Azure. Strong background in data streaming and search technologies such as Kafka, Solr, and PostgreSQL. Proven track record in agile SCRUM teams and successful collaboration with international stakeholders across complex software projects.

🇩🇪Berlin, Germany$30/hr100% JSSSince Jun 2025
GlobeUpwork

Earnings and projects

MRR
$52

Last 6 months ÷ 6

World#149,837 / 412k
🇩🇪Country#1,195 / 3,842
Revenue, last 30 days
$0

Last 6 months: $312

Total earnings
$1.2k
World#379,347 / 412k
🇩🇪Country#3,566 / 3,842
Per project
$1.2k

$312 in the last 6 months

World#110,999 / 412k
🇩🇪Country#892 / 3,842
Projects, last 6 months
1
100% fixed0% hourly
World#128,092 / 412k
🇩🇪Country#1,059 / 3,842
Projects in all
1

Across 2 contracts

100% fixed0% hourly
World#360,671 / 412k
🇩🇪Country#3,469 / 3,842

Earnings, last 30 days

$1.2kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$1,160$1,180$1,200$1,220Oct 8Oct 23Nov 7

Skill rankings: Top 20% in JUnit

Ranked by MRR among everyone on Upwork with the skill.

  1. #22Apache Solr84 freelancers · 🇩🇪 #1Top 26%
  2. #38JUnit186 freelancers · 🇩🇪 #1Top 20%
  3. #246Apache Kafka981 freelancers · 🇩🇪 #1Top 25%
  4. #505Spring Boot2,150 freelancers · 🇩🇪 #7Top 23%
  5. #581Microservice2,217 freelancers · 🇩🇪 #6Top 26%
  6. #849Google Cloud Platform2,939 freelancers · 🇩🇪 #6Top 29%
  7. #895Kotlin3,021 freelancers · 🇩🇪 #7Top 30%
  8. #921Kubernetes3,351 freelancers · 🇩🇪 #12Top 27%