Principal Java Engineer – Retail

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!

6‑month contract outside IR35. You will be required to work in Paddington 3 days a week.

What does the role involve?

• Lead technical deep dives and knowledge sharing in the teams, anticipating challenges and proposing solutions
• Start influencing product and business decisions

Hands‑on Software Development

• Write high‑quality Java code using frameworks such as Spring Boot or Micronaut.
• Build robust services that support secure, high‑volume payment transactions.
• Develop integrations with acquiring banks, payment gateways, and fraud detection tools.

Cloud & DevOps Practices

• Build and support cloud‑native systems on the cloud (preferably Azure) using Terraform and Kubernetes.
• Manage CI/CD pipelines using GitHub Actions and ensure smooth delivery to production.
• Own monitoring, alerting, and observability, using tools like OpenTelemetry and Dynatrace.

Security & Compliance

• Champion secure coding practices and data protection across services.

Collaboration & Mentoring

• Work closely with product owners, engineering leads, and other stakeholders to shape technical solutions.
• Mentor and support more junior/mid/senior engineers, driving technical excellence across the board.
• Help establish and promote best practices around code review, testing, delivery, and operational support.

Continuous Improvement

• Continuously improve platform reliability, performance, and cost‑efficiency.
• Stay up-to-date with technology trends and proactively identify innovation opportunities.

Requirements

• Proven experience as a Principal Java Engineer in backend‑heavy environments in teams having multiple levels of engineering.
• 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.
• Hands‑on knowledge of Kafka, event‑driven architecture, enterprise integration patterns and Microservices.
• Solid understanding of payment systems and PSP integrations, including fraud, tokenisation, and settlement flows.
• Experience with cloud infrastructure (Azure preferred), CI/CD, and Kubernetes.
• Working knowledge of regulatory and compliance standards (PCI DSS, SCA, PSD2).
• Strong communication skills and the ability to explain complex technical concepts to a range of audiences.
• Experience working in Agile/Scrum teams with a DevOps culture and test‑driven mindset.

Benefits

• Competitive Rates
• Six‑month contract outside IR35 with possibility of extension
• Friendly and welcoming team
• Opportunity to work with one of the UK’s leading Retailers

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