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Barclays Logo Barclays · IT - Software Development

Principal Engineer - CPTO, BPL

United Kingdom, London · Job Posted June 02, 2026
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Job Description

As an Engineering Lead in our Chief Product and Technology Office (CPTO), you’ll shape the architecture of tomorrow and mentor talented engineers, crafting elegant solutions for complex problems to create solutions that millions depend on. In this role you'll be at the forefront of innovation, designing and building highly resilient, scalable distributed services that power critical business operations. You'll work with modern JVM languages (primarily Kotlin), cloud-native technologies, and contemporary frontend frameworks.

Job Responsibility

  • Design and implement highly performant, fault-tolerant distributed services
  • Apply domain modelling principles to create clean, maintainable codebases
  • Champion comprehensive testing strategies
  • Build responsive web UIs
  • Live the 'you build it, you run it' philosophy
  • Embed security into every layer of your solutions
  • Leverage AI-powered tools to accelerate development
  • Provision of guidance and expertise to engineering teams
  • Contribution to strategic planning
  • Design and implementation of complex, scalable, and maintainable software solutions
  • Mentoring and coaching to junior and mid-level engineers
  • Collaboration with business partners, product managers, designers, and other stakeholders
  • Innovation within the organization by identifying and incorporating new technologies

Requirements

  • Experience gained in a Payment Acquiring, Fintech or Payment SaaS business
  • Product thinking approach
  • Sophisticated communication - demonstrating the ability to bring both technical and non-technical stakeholders on the journey
  • A polyglot mindset with expertise of at least two languages
  • JVM Mastery – Deep expertise in at least one JVM language (Kotlin, Java, Scala, or Clojure)
  • Cloud-Native Mindset – Hands-on experience with cloud platforms (AWS, Azure, GCP)
  • Messaging & Events – Solid grasp of messaging technologies (Kafka, RabbitMQ, SQS, NATS)
  • Data Layer Expertise – Experience with both SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, DynamoDB, Redis) databases
  • API Design – Proven track record designing RESTful and/or GraphQL APIs that scale
  • Rust – Experience with systems programming and performance-critical services
  • AWS Mastery – Advanced AWS knowledge
  • Kubernetes – Container orchestration experience with K8s, Helm, and cloud-native deployment strategies
  • React – Modern frontend development skills with React, TypeScript, and state management libraries
  • Observability – Experience with monitoring, logging, and tracing tools
  • CI/CD Wizardry – Strong DevOps mindset with experience in automated deployment pipelines, infrastructure as code, and GitOps practices

Nice to have

  • Rust
  • AWS Mastery
  • Kubernetes
  • React
  • Observability
  • CI/CD Wizardry

What we offer

  • Competitive holiday allowance
  • Life assurance
  • Private medical care
  • Pension contribution
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