Principal Engineer, Seller Experience

Ratepay

full-time

Posted on: 1/20/2026

Location Type: Hybrid

Location: Berlin • Germany

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About the role

Lead the design and implementation of the domain architecture for our software systems
Ensure that our systems are scalable, reliable, and easy to maintain
Foster cross-domain collaboration and alignment to ensure that our systems are fully integrated
Make technical decisions and provide guidance to the development team
Work with business stakeholders and other members of the development team to understand requirements and make technical decisions that align with the overall architecture and strategy
Collaborate with technical teams to ensure applications are optimized for the cloud
Extend existing APIs to improve functionality and performance
Stay up to date with the latest technologies and industry trends and bring new ideas to the team.

Bachelor's degree in Computer Science or a related field
10+ years of experience in software development, with a focus on Java or Kotlin
Strong experience with domain-driven design (DDD) and architecture
Solid understanding of Java, Kotlin, Spring, and related technologies
Experience in fintech (financial technology)
Experience with AWS
Experience integrating applications with Salesforce
Experience with microservices architecture and RESTful APIs
Experience designing and building customer- and merchant-facing APIs and SDKs
Experience building and maintaining comprehensive documentation to support merchant integrations.

Benefits

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

JavaKotlinSpringdomain-driven designmicroservices architectureRESTful APIsAPIsSDKsdocumentationcloud optimization

Soft Skills

leadershipcollaborationtechnical decision-makingguidancecommunication

Certifications

Bachelor's degree in Computer Science