Principal Engineer - Java

Salary: £100,000 - 110,000 per year

Requirements:

• Strong experience building and scaling banking payment systems, including Faster Payments, Real-Time Payments, Card payments, BACS, mobile wallets, and APIs.
• Experience leading architectural challenges, system scalability, and guiding engineering teams.
• Background in Java, C#, Python, or React development with hands-on technical leadership experience.
• Strong background in core banking systems/platforms such as Mambu, cloud-native architectures, microservices, and DevOps practices.
• Solid understanding of regulatory, risk, and compliance requirements such as PSD2, PCI DSS, and GDPR.
• Experience with cloud platforms such as AWS, Azure, or GCP and modern data platforms.

Responsibilities:

• Lead the development and implementation of a modern cloud foundation and data platform that is robust, scalable, fully automated, secure, and able to support business growth.
• Design and implement scalable, secure, and high-performing cloud-native architectures using modern technologies.
• Design and build secure RESTful and GraphQL APIs, ensuring seamless integration with core banking systems and external services such as Open Banking platforms.
• Work closely with data teams to define robust data pipelines and scalable cloud-based data platforms using tools such as Apache Kafka, Snowflake, or Databricks.
• Implement monitoring and observability solutions using tools such as Prometheus, Grafana, or Datadog to proactively identify and resolve performance bottlenecks.
• Analyse and optimise existing systems to improve performance, scalability, and maintainability.
• Provide hands-on technical leadership while contributing to architectural decision-making across payment products and platforms.

Technologies:

• AWS
• Azure
• C#
• Cloud
• Databricks
• Datadog
• DevOps
• GCP
• Grafana
• GraphQL
• Support
• Java
• Kafka
• Mobile
• Prometheus
• Python
• React
• Snowflake
• microservices
• API

More:

We are a leading financial services corporation offering a Principal Engineer role focused on payments, with strong hands-on involvement and architectural leadership across Faster Payments, Real-Time Payments, Card payments, BACS, mobile wallets, and APIs. This is a hybrid onsite role based in London, Chatham (Kent), or Wolverhampton, with onsite presence required two days per week. We offer a basic salary up to circa £110,000, a 25% bonus, and a competitive benefits package that includes 28 days holiday, a holiday purchase scheme, occasional travel, health insurance, a 13% pension contribution, and more.

last updated 32 week of 2026