Principal Java Engineer (Retail)

Requirements

• Proven experience as a Principal Java Engineer in backend-heavy environments in teams having multiple levels of engineering

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• Strong experience in Java 17+, ideally with experience in using Spring Boot or Micronaut. Kotlin experience is a bonus. If the applicant does not have experience they must show willingness to learn Kotlin

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• Hands-on knowledge of Kafka, event-driven architecture, enterprise integration patterns and Microservices

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• Solid understanding of payment systems and PSP integrations, including fraud, tokenisation, and settlement flows

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• Experience with cloud infrastructure (Azure preferred), CI/CD, and Kubernetes

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• Working knowledge of regulatory and compliance standards (PCI DSS, SCA, PSD2)

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• Strong communication skills and the ability to explain complex technical concepts to a range of audiences

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• Experience working in Agile/Scrum teams with a DevOps culture and test-driven mindset

What the job involves

• At Mindera, we craft software with people we love. We’re looking for a Principal Java Engineer with strong Retail experience who can join our crew!

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• This is a six month contract that sits outside IR35

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• Lead technical deep dives and knowledge sharing in the teams, anticipating challenges and proposing solutions

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• Start influencing product and business decisions

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• Write high-quality Java code using frameworks such as Spring Boot or Micronaut

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• Build robust services that support secure, high-volume payment transactions

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• Develop integrations with acquiring banks, payment gateways, and fraud detection tools

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• Build and support cloud-native systems on the cloud (preferably Azure) using Terraform and Kubernetes

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• Manage CI/CD pipelines using GitHub Actions and ensure smooth delivery to production

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• Own monitoring, alerting, and observability, using tools like OpenTelemetry and Dynatrace

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• Champion secure coding practices and data protection across services

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• Work closely with product owners, engineering leads, and other stakeholders to shape technical solutions

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• Mentor and support more junior/mid/senior engineers, driving technical excellence across the board

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• Help establish and promote best practices around code review, testing, delivery, and operational support

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• Continuously improve platform reliability, performance, and cost-efficiency

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• Stay up-to-date with technology trends and proactively identify innovation opportunities

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