Principal Engineer

Avenue3; Leeds; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Company pension

Growth opportunities

Job summary

Avenue3 is a Yorkshire-based digital consultancy delivering open data and modern engineering for health, government and regulated sectors. We’re looking for a Principal Engineer who combines deep technical delivery with a strong consulting mindset and client-focused approach.

You’ll partner with clients to define pragmatic, scalable architectures, influence direction, and translate ambiguous needs into concrete designs. You’ll mentor teams and drive value across the full delivery lifecycle.

Qualifications

• Deep technical expertise with consulting mindset and client focus.
• Ability to translate ambiguous requirements into scalable architectures.
• Experience leading engineering teams and delivering across SDLC.

Responsibilities

• Lead architecture and technical leadership across complex client projects.
• Design, build and maintain robust backend services with C#/.NET and frontend with React/TypeScript where needed.
• Engage with product owners and clients to align technical decisions with business goals.
• Identify opportunities to extend engagements through architecture, delivery approach and data strategy.
• Mentor engineers and lead teams or workstreams to ensure disciplined delivery.

Skills

C#

.NET

React

TypeScript

Azure

DevOps

CI/CD

Containerisation

Architecture

Leadership

Mentoring

Tools

Docker

Azure DevOps

Job description

Who are we?

Avenue3 is a Yorkshire-based digital consultancy specialising in open data, modern engineering and the transformation of complex systems across health, government and regulated sectors. We bring deep expertise across strategy, discovery, architecture and engineering, helping organisations modernise systems and adopt open data standards for long-term interoperability.

Who are we?

Avenue3 is a Yorkshire-based digital consultancy specialising in open data, modern engineering and the transformation of complex systems across health, government and regulated sectors. We bring deep expertise across strategy, discovery, architecture and engineering, helping organisations modernise systems and adopt open data standards for long-term interoperability.

Our teams focus on high-quality delivery, using agile, collaborative ways of working that de-risk programmes and accelerate outcomes. Avenue3 offers a purpose-driven culture centred on impact, openness and meaningful problem-solving - giving engineers genuine autonomy and influence over how we design and deliver solutions.

The opportunity

At Avenue3, we’re looking for a Principal Engineer who brings both deep technical expertise and a strong consulting and customer focussed mindset. This role goes beyond engineering delivery - it’s about partnering with our clients to understand complex challenges, shaping pragmatic solutions and helping organisations make confident, informed technical decisions.

You’ll thrive in environments where problems are not always fully defined, using your experience to guide discovery, influence direction and translate ambiguous requirements into clear, scalable architectures. Acting as a trusted technical advisor, you’ll combine hands‑on engineering leadership with the ability to engage stakeholders, challenge assumptions and unlock value across the full delivery lifecycle.

Alongside owning technical delivery, you’ll play a key role in identifying opportunities to extend and deepen client engagements - spotting where additional value can be delivered through improved architecture, modernisation or smarter use of data.

Core Responsibilities

Architecture & Technical Leadership

• Lead technical design and solution architecture across complex, multi‑stakeholder client projects.
• Define and uphold high engineering standards to ensure platforms are scalable, secure, interoperable and future‑proof.
• Champion modern architectural approaches, including cloud‑native patterns, modular design and open‑data‑aligned engineering practices.

Engineering & Delivery

• Design, build and maintain robust backend services using C#/.NET.
• Support high‑quality front‑end development using React and TypeScript where required.
• Deploy and operate cloud‑native solutions in Azure, applying strong DevOps practices, CI/CD pipelines and containerisation.
• Deliver clean, maintainable code backed by rigorous testing across the SDLC.
• Review and contribute to technical implementation plans, ensuring smooth execution from discovery through to production.

Collaboration & Client Engagement

• Work closely with product owners, stakeholders and client teams to shape requirements and align technical decisions with business needs.
• Communicate architectural direction clearly to both technical and non‑technical audiences.
• Support collaborative design and discovery sessions, acting as a trusted technical partner for Avenue3 clients.

Commercial Awareness & Value Creation

• Develop a strong understanding of client organisations, their goals and the broader commercial context in which they operate.
• Identify opportunities to add value beyond immediate project scope, including improvements to architecture, delivery approach, data strategy or operational efficiency.
• Proactively surface opportunities for follow‑on work, extensions or new engagements, working collaboratively with delivery leads and account teams.
• Balance technical decision‑making with commercial considerations - ensuring solutions are not only robust and scalable, but also pragmatic and cost-effective.
• Contribute to proposals, statements of work and discovery outputs, shaping commercially viable and technically sound approaches.
• Build trusted client relationships that position Avenue3 as a long‑term partner, enabling repeat business and sustained impact.

Growth, Mentoring & Team Development

• Mentor engineers across varying levels of experience, fostering a culture of quality, curiosity and continuous improvement.
• Lead engineering teams or workstreams, ensuring effective collaboration and disciplined delivery.
• Contribute to internal knowledge‑sharing, engineering playbooks and communities of practice.

Benefits And Culture

This role offers a competitive salary alongside a company pension and clear opportunities for ongoing growth.

We foster an inclusive, supportive culture where engineering excellence, personal development and innovation are valued - and where people are trusted to deliver meaningful impact in a collaborative, open environment.