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Principal Engineer

AJ Bell Management LimitedManchester, England, United Kingdom

30+ days ago

Job type

Full-time

Job description

We are a technology-driven company building high-performing, scalable, and resilient software solutions. Our teams work with a modern tech stack including .NET, MongoDB, AWS, Jenkins, SQL Server, and streaming technologies.

We’re looking for a hands-on Principal Engineer who can code, design scalable systems, manage Staff Engineers, and drive technical excellence across multiple teams. This role is perfect for a technical leader who still enjoys writing code while shaping architecture and mentoring engineers.

About the role

As a Principal Engineer, you will play a critical role in :

Architecting scalable, high-performance systems
Coding and reviewing mission-critical features (at least 60% hands-on)
Managing and mentoring Staff Engineers & Senior Developers
Driving best practices in software development and AI-powered engineering
Owning non-functional requirements (NFRs) such as security, scalability, and reliability
Optimising cloud infrastructure and CI / CD pipelines

If you thrive on solving complex technical challenges, leading by example, and empowering teams, this is the role for you!

Key responsibilities

Hands-on coding (at least 60% of the time), working on core application components and system architecture

Technical leadership – guiding multiple teams and ensuring best practices

Managing & mentoring Staff Engineers – supporting career growth and technical excellence

Architecting and scaling distributed systems and cloud-native applications

Defining and enforcing non-functional requirements (NFRs) – scalability, security, performance

Implementing Test-Driven Development (TDD) and automation best practices

Optimising CI / CD pipelines with Jenkins & AWS

Leading containerisation efforts with Docker & Kubernetes

Collaborating with cross-functional teams to align technical solutions with business needs

Research and implement AI-driven development tools to boost productivity

What we’re looking for

Proven experience as a Principal Engineer / Lead Engineer / Software Architect

Proven hands-on coding experience with .NET, SQL Server, MongoDB, Angular / NextJS, AWS, and streaming technologies

Strong experience in building scalable and high-performance applications

Strong experience managing Staff Engineers & Senior Developers

Solid understanding of Test-Driven Development (TDD) and modern testing frameworks

Experience with Docker & Kubernetes for containerisation and cloud deployment

Strong knowledge of CI / CD pipelines, automation, and deployment best practices

Experience with AI-assisted development tools is a plus

Excellent leadership and communication skills – able to coach and influence team

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Principal Engineer • Manchester, England, United Kingdom

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