Principal Software Engineer; UI

Role Overview

The Principal UI Engineer serves as a senior technical authority within the UI engineering discipline, providing leadership across design, architecture, standards, and delivery. The role is hands‑on, focused on building scalable, high‑performance UI systems while mentoring engineers and influencing best practices across multiple teams. Operating within agile teams, the Principal UI Engineer sets engineering direction, supports architectural decision‑making, and ensures the delivery of high‑quality, robust UI solutions.

• Lead the design and development of scalable, high‑performance UI applications.
• Provide technical leadership and mentoring to UI engineers across teams.
• Establish and maintain UI engineering standards, patterns, and best practices.
• Oversee solution design, analysis, and implementation for complex UI systems.
• Communicate architectural decisions to technical and non‑technical stakeholders.
• Guide teams through estimation, planning, and prioritisation using established SDLC processes.
• Drive continuous improvement initiatives to optimise UI performance, usability, and maintainability.
• Identify opportunities to evolve systems toward target architecture and lead refactoring initiatives.
• Support risk identification, escalation, and mitigation within engineering teams.
• Design, develop, and maintain software, ensuring seamless integration and performance.
• Collaborate with cross‑functional teams, including Business Analysts (BAs) and Project Managers (PMs), to gather and refine requirements.
• Implement and maintain Infrastructure as Code (IaC) using AWS CDK with Python to automate deployment and management of cloud resources.
• Ensure high‑quality code through automated testing, particularly unit testing, and maintain a strong emphasis on code quality and complexity.
• Oversee the implementation and management of CI/CD pipelines to streamline the software development lifecycle.

• Proven experience as a senior or principal UI engineer within complex, high‑performance systems.
• Experience with UI component libraries such as Material UI or Ant Design.
• Proficiency in HTML5, CSS, and responsive design principles.
• Knowledge of performance optimisation and profiling techniques.
• Strong understanding of AWS services and hands‑on experience with Infrastructure as Code (IaC), particularly using AWS CDK in Python.
• Experience with Entity Framework (or other CRMs) is beneficial.
• Experience designing and building systems using a contract‑first methodology is beneficial.
• Experience with writing tests or scripts in Python is beneficial.
• Familiarity with testing frameworks such as Jest and industry code‑quality tools.
• Skilled in Git‑based source control and agile development methodologies.
• Strong communication and collaboration skills, able to influence engineering direction.
• Strong understanding of microservices architecture in cloud environments.
• Strong grasp of database design and experience with relational and/or No
  
  SQL databases.
• Competent in using Docker for containerisation.
• Familiarity with Kubernetes, relying on the Dev Ops Engineer for orchestration.
• Proficiency in using Git for version control and JIRA for backlog management.
• Experience with CI/CD pipelines and tools.