Freelance Senior Software Engineer (Java/Kotlin)

Location: Netherlands (Hybrid)

Type: Freelance

Start: ASAP

For our client, a market leader in e-Commerce, we are urgently looking for hands-on Senior Backend Engineers to deliver scalable, high-performance solutions in a cloud-native microservices environment. This is a plug & play freelance role requiring deep technical expertise and autonomy from day one.

Key Responsibilities:

Build and optimize scalable, resilient microservices in a distributed system
Write clean, testable, and production-ready Java/Kotlin code
Collaborate across engineering, product, and design to refine technical solutions
Embrace a DevOps culture: own what you build, monitor and improve services

Tech Stack:

Languages: Java, Kotlin
Architecture: Microservices, event-driven
Cloud: AWS / GCP / Azure (flexible), Kubernetes, Docker
CI/CD: GitHub, Jenkins, Terraform, etc.
Testing: JUnit, TestContainers, MockK

Ideal Background:

5+ years backend engineering experience in complex systems
Strong knowledge of system design, clean code, and testing best practices
Prior work in financial services, fintech, or high-availability platforms is highly valued

Ready to jump in? We look forward to your CV and motivation and will get in touch shortly!

Hamlyn Williams

New Jobs

Senior Java/Kotlin Software Engineer (Freelance)