Principle Full Stack Engineer

La Fosse Associates; Liverpool; On-site; GBP 76,500 - 93,500; Full time

Job summary

La Fosse Associates in Liverpool is seeking a Principal Full Stack Engineer to lead the redesign of a core automotive marketing platform using modern Node.js technologies. You will be a key player in architecting and shaping high-performance backend services and APIs, integrating cutting-edge AI tooling into workflows.

The ideal candidate will have solid experience in a senior engineering role, mentorship skills, and a collaborative mindset. Join this dynamic environment at a pivotal moment in their transformation journey.

Qualifications

• Experience leading design and architecture for robust platforms.
• Proven ability to mentor and work collaboratively within small teams.
• Hands-on experience with modern backend development.

Responsibilities

• Lead design of key parts of a brand-new platform.
• Build and own backend services, APIs, and data pipelines at scale.
• Make architecture decisions that the wider team builds on.
• Stay hands-on while mentoring senior engineers.
• Partner closely with product and leadership on priorities.

Skills

Node.js

TypeScript

React

Next.js

Cloud platforms (Azure)

APIs

Data pipelines

Distributed systems

AI tooling

Job description

Principle Full Stack Engineer – Up to £85k – Liverpool

A well-established organisation in the automotive marketing space is hiring a Principal Full Stack Engineer to join at a key moment of transformation. Their platforms power high-intent buying journeys, processing hundreds of thousands of customer interactions each year for some of the world’s biggest automotive brands.

They’re now rebuilding a core platform from the ground up on a modern Node.js stack, while reshaping the engineering function around an AI-first approach. Strong foundations are already in place, but there’s still plenty of greenfield and real opportunity to shape both the product and how the team operates.

The role:

Principal Full Stack Engineer (backend-leaning). You’ll be central to the rebuild, shaping architecture, setting standards and working directly with product and leadership. Small, senior team. High ownership.

What you’ll do

• Lead design of key parts of a brand-new platform
• Build and own backend services, APIs and data pipelines at scale
• Make architecture decisions that the wider team builds on
• Stay hands-on while mentoring senior engineers
• Partner closely with product and leadership on priorities and trade-offs
• Help embed AI tooling into everyday engineering workflows

Tech stack

• Node.js, TypeScript
• React / Next.js
• Cloud platforms (Azure preferred, AWS or GCP also relevant)
• APIs, data pipelines, distributed systems
• AI tooling integrated into development workflows