Principal Software Engineer

About

The Role Final date to receive applications: 11:59pm on 31st October 2025 Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. We use technology to create impactful, human-centred solutions that make a difference to users and organisations. We believe great engineering happens when teams collaborate, learn, and build with purpose.

Youll provide hands-on technical leadership, working closely with senior stakeholders, mentoring engineers across multiple teams, and line managing a small group of engineers while helping shape our approach to software delivery, architecture, and engineering culture. Responsibilities Lead the design and development of advanced software solutions, ensuring high standards of quality, security and scalability. Set the technical direction for projects and influence the wider technology strategy.

Provide line management for a group of engineers (typically up to six), supporting their career progression and ensuring theyre set up for success. Provide technical leadership and coaching, fostering a culture of excellence, collaboration and continuous learning. Collaborate with senior stakeholders to translate complex business problems into elegant, robust solutions. Champion modern engineering practices including CI/CD, test automation and infrastructure as code.

Foster a Dev Ops culture that enables teams to build, deploy and run their services confidently through automation and continuous delivery. Drive the evaluation and adoption of emerging technologies to improve how we deliver software. Lead technical due diligence during project scoping, bids and new opportunities. Represent the engineering function in strategic discussions, influencing our technology roadmap. Anticipate and manage project risks, helping teams navigate complex technical challenges.

About You Professional knowledge and experience Essential Extensive experience in software engineering, with a focus on large-scale, complex systems. Polyglot engineer comfortable working across multiple languages and frameworks (weve used Python, Java, Kotlin, Node.js, C#, JavaScript, Express, React and Next.js to name a few). Passion for learning new technologies and helping others do the same. Proven track record of leading software architecture design and strategic technology initiatives.

Strong expertise in cloud platforms, microservices and modern software development practices.

Experience with direct line management and mentoring junior to senior engineers. Excellent communication skills. Ability to communicate complex technical concepts clearly to both technical and non-technical stakeholders.

Desirable Experience working in a consultancy environment, managing client relationships at a senior level. Experience delivering government or public sector projects. Eligible for (or holding) SC security clearance Knowledge of AI, machine learning, or other emerging technologies relevant to software engineering. Experience promoting knowledge sharing. This might be through mentoring, blogs, talks, or internal communities. Behaviours and PACT values

Purpose:

Be values-driven, recognising that our client's needs are paramount. Approach client engagements with professionalism and creativity, balancing commercial and operational needs. Accountability:
Be accountable for delivering your part of a project on time and under budget and working well with other leaders. Lead by example, promoting a culture where quality and client experience are foremost. Craft:
Balance multiple priorities while leading high-performing teams. Navigate ambiguity and set the technical direction and approach to support positive outcomes. Togetherness:
Collaborate effectively with others across TPXimpact. Build strong relationships with colleagues and clients. About Us People-Powered Transformation We're a purpose driven organisation, supporting organisations to build a better future for people, places and the planet. Combining vast experience in the public, private and third sectors and expertise in human-centred design, data, experience and…