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Zoolatech Logo Zoolatech · IT - Software Development

Senior Kotlin/Java Engineer

Poland, Wroclaw · Job Posted December 14, 2025
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Job Description

Join the engineering team and help build scalable backend services that power one of the world’s leading meal-kit delivery platforms. The team is responsible for ensuring that millions of customers around the world can pay seamlessly and securely for their subscriptions. You’ll work in a high-scale, event-driven microservices environment focused on supporting and expanding our payment capabilities. Right now, our main goal is to implement new payment methods via existing providers, making sure that recurring payments are successful or recovered on time. The scope of work includes extending existing systems, integrating with third-party payment providers, and ensuring that all changes are well-tested, documented, and smoothly integrated.

Job Responsibility

  • Design, build, and maintain backend microservices within a high-scale, event-driven environment
  • Add and maintain payment options for customers through existing providers
  • Implement new payment methods and ensure they are technically sound, stable, and fully tested
  • Work with AWS, Kubernetes, and CI/CD pipelines to ensure reliable and automated delivery
  • Design and maintain REST/gRPC APIs, integrating with Kafka, SNS/SQS, PostgreSQL, and Redis
  • Focus on quality, security, and resilience — including testing (unit, integration, contract)
  • Strengthen observability and system reliability through logging, metrics, tracing, and runbooks
  • Work in an Agile environment
  • Participate in code reviews, share knowledge, and contribute to team growth

Requirements

  • 5+ years of professional backend development experience
  • Strong expertise in Kotlin (and Java), building scalable microservices, ideally in high-traffic or e-commerce environments
  • Hands-on experience with Kubernetes, AWS, and CI/CD pipelines
  • Familiarity with event-driven architectures and message brokers (Kafka, SNS/SQS)
  • Solid understanding of PostgreSQL
  • Experience in testing best practices (unit, integration, contract, TDD)
  • Knowledge of Grafana for monitoring and observability
  • Excellent English communication skills – clear, structured, and collaborative

Nice to have

Experience with A/B testing frameworks is an advantage

What we offer

  • Paid Vacation
  • Sick Days
  • Sport/Insurance Compensation
  • English Classes
  • Charity
  • Training Compensation
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