Principal Engineer

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Principal Engineer in UK

The Collinson Group
Full time
Email

UK
10/05/2026
Report

London

Responsibilities

Own the technical strategy and architectural vision for the APIs pillar across multiple squads.
Design and develop complex, high-scale, distributed systems while writing production code and building proofs of concept.
Guide teams in producing scalable, maintainable, secure, performant, and observable software.
Mentor and coach Lead Engineers and squad engineers through technical guidance, design reviews, and career development.
Champion automated testing, deployment practices, SOLID principles, and consistent engineering standards.
Improve system observability and performance using DataDog and related tools.
Collaborate with Product Managers, Senior Product Directors, Delivery Managers, and Engineering Managers.
Support resilient infrastructure and deployments using GitHub Actions, Terraform, Kubernetes, Helm, and AWS.
Explore and promote AI-driven development and the use of AI in engineering processes.

Requirements

Principal-level experience leading the technical direction of a major engineering pillar and guiding multiple squads.
Hands-on experience designing and developing large, distributed, data-driven cloud systems.
Experience running an engineering team or squad and mentoring engineers at all levels.
Strong experience with TypeScript, Node.js, React, JavaScript, AWS, Kubernetes, and GraphQL.
Critical knowledge of Kafka and familiarity with Salesforce or other CRM platforms.
Experience with AWS services including EKS, Lambda, and Aurora RDS, and with containerized applications.
Familiarity with Jest and Pact and strong experience with automated testing practices.
Experience deploying production systems using Terraform and Helm, with GitHub Actions as a deployment platform.
Experience with DataDog or similar observability tooling and with systems handling high throughput.
Ability to write high-quality maintainable code, make pragmatic architectural decisions, and guide teams through complex technical problems.

Benefits

Competitive reward package supporting financial, physical, and mental wellbeing.
Opportunities to learn, develop, and receive recognition for contributions.
Benefits vary by role and location, with full details provided during the application process.

Salary: Competitive

The Collinson Group

Collinson Group builds travel experience and customer loyalty products for airlines, payment networks, and financial services brands, and sells travel insurance and assistance direct and via partners. Its portfolio includes Priority Pass and LoungeKey airport lounge access, plus loyalty strategy ...

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