Principal Engineer

🔒 Confidential Employer
Posted 3 May 2026
LOCATION
London
TYPE
Full-time
LEVEL
Mid-Senior level
CATEGORY
Technology
This employer holds a UK Home Office sponsor license — sponsorship for this specific role is at the employer’s discretion

SKILLS

JavaScript React TypeScript Node.js AWS Microservices GraphQL Docker

FULL DESCRIPTION

Principal Engineer

Here at [Employer hidden — view at passion-project.co.uk] we’re on a mission to reinvent retail, with our customers and sustainability at the heart of everything we do. We have an exciting opportunity for a Principal Engineer to join our agile teams in our London office.

Job Introduction

As a Principal Engineer, you’ll play a pivotal role in shaping the technical direction, strategic vision, and innovation of our Customer & Data applications. Your expertise in leading technology transformations will be key as we transition from monolithic architectures to a multi-cloud, scalable MACH-based platform.

As a Principal Engineer You will:

  • Manage a diverse portfolio of engineering initiatives across domain, ensuring alignment with business goals and technical standards
  • Provide technical leadership, formulating technical strategies, making decisions on solutions, SME support establishing and standardising robust engineering practices.
  • Investigate and become a subject matter expert in new technologies introduced to our stack
  • Develop and lead microservice architecture strategies for the development of scalable, flexible, and cost-effective applications.
  • Work with Platform engineers to design CI/CD pipelines and quality frameworks for frequent, reliable releases.
  • Collaborate across engineering teams in your domain and help members make informed decisions aligned with strategic plans.
  • Work with the Product, Architecture and Delivery teams to develop roadmaps for both product features and technical improvements.
  • Troubleshoot and resolve complex issues in both front-end and back-end systems.
  • Set up processes and frameworks for live support and maintenance of engineering services, technical debt management, creating robust and reliable support model for delivered services.
  • Promote and support a quality-focused culture within the engineering team.
  • Advocate for modern development practices like pair programming, TDD, SOLID principles, technical debt management and the use of cloud-native solutions when appropriate
  • Build, mentor and foster and develop engineering talent to collaborate effectively with architecture, delivery, DevOps, InfoSec, and support teams.
  • Promote a culture of innovation, continuous learning, and teamwork to deliver secure, scalable systems.

You'll Have:

  • Strong foundation in software engineering principles and scalable system design.
  • Experience working on distributed, cloud-hosted products with rapid release cycles.
  • Proficiency in BE and FE development using JavaScript, React, Next.js, TypeScript and Node.js
  • Strong experience in working with one of the cloud technologies and architecture
  • Experience in AWS specifically with Lambda, DynamoDB, SQS, SNS and EventBridge is a plus.
  • Experience in designing and leading the implementation of micro frontends, microservices, event-driven and headless architectures.
  • Good understanding of GraphQL.
  • Proficiency in database management (SQL, NoSQL) and version control
  • Experience with DevOps practices and tools (e.g., Docker, Jenkins, Kubernetes).
  • Experience with monitoring solutions like CloudWatch or Dynatrace.
  • Good understanding of infrastructure as code (IaC) would be beneficial (e.g AWS CDK, Terraform.)
  • Good understanding of engineering security best practices e.g. NIST and PCI standards
  • Proven track record in technical decision-making and guiding teams to implement maintainable solutions.
  • Strong leadership, mentoring, and collaboration skills.
  • Ability to lead Engineering Guilds
  • Experience in working in fast-paced, dynamic environments, and in driving change through innovation and collaboration.

[Employer hidden]

Location: London, United Kingdom | Posted: 8 October, 2024 | Salary: Competitive plus benefits (Annually) | Job Reference: [Employer hidden]/TP/236299/5543

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