Principal Engineer

pluxee; Milton Keynes; On-site; GBP 90,000 - 130,000; Full time

Job summary

Pluxee is seeking a Principal Engineer to act as the senior technical authority for the UK digital products and platforms built on .NET. You will influence architecture, deliver high-risk components and steer engineering practice across squads.

You will own end-to-end technical direction, from product discovery through design, delivery and operation, ensuring secure, scalable and auditable solutions that drive measurable business outcomes.

Job description

At Pluxee, we shape the world of employee benefits and engagement by bringing to life a personalized and sustainable employee experience, at work and beyond.

Permanent Regular

Job Description:

The Principal Engineer is the senior individual contributor responsible for technical leadership, solution architecture and engineering excellence across Pluxee UK's .NET-based digital products and platforms.

s a Principle Engineer you will expected to:

Own and influence end-to-end technical direction across product discovery, design, delivery and operation. It combines hands-on engineering with architectural leadership, ensuring that solutions are secure, scalable, resilient, maintainable and aligned with measurable business outcomes.

Support and enhance existing internally developed products while shaping new products and platform capabilities across Payments, Discounts, Benefits, Rewards, Salesforce, Business Central, Analytics, mobile applications and web portals.

Provide technical direction across squads, establishes engineering guardrails, manages technical debt and ensures adherence to internal governance, audit, security, privacy and accessibility requirements. A key objective is to align the UK technology landscape and product needs with global enterprise standards, strategies and reusable platform capabilities.

YOUR NEXT CHALLENGE

Deliver scalable, secure, resilient and cost-effective end-to-end technical solutions that meet product, business, functional and non-functional requirements.

Provide visible technical leadership that improves engineering quality, delivery confidence, team capability and consistency across squads.

Align product technology roadmaps with business strategy, Pluxee enterprise standards, security requirements and global platform direction.

Ensure architecture decisions, system documentation and operational controls are current, traceable and suitable for governance and audit.

Technical leadership for products and platforms

Own and evolve the end-to-end technical architecture for .NET digital products and shared platform capabilities. Act as the senior technical authority for product squads, resolving complex design decisions and providing clear, pragmatic technical direction.

Remain hands-on through prototypes, reference implementations, code reviews, troubleshooting and targeted delivery of high-risk or high-value components.

Partner with Product Owners, Product Managers and Digital Asset Owners to translate product outcomes into coherent technical capabilities, features and user stories.

Identify technical risks, dependencies and constraints early, with proportionate mitigation and decision records

Engineering excellence and software quality

Establish and promote engineering standards covering clean architecture, SOLID principles, secure coding, automated testing, code quality and maintainability.

Define guardrails for APIs, event-driven integration, data access, error handling, logging, monitoring and operational readiness.

Champion performance engineering, resilience testing, accessibility by design and production supportability.

Coach engineers and technical lead through design reviews, pairing, code reviews and communities of practice

Lead root-cause analysis for complex technical issues and ensure systemic improvements are captured in product backlogs.

Architecture governance and documentation

Maintain an accurate architecture repository and system inventory covering applications, integrations, infrastructure, data flows, technology standards and lifecycle status.

Produce and maintain solution context, container, component, deployment, sequence, integration and data-flow views at an appropriate level of detail.

Document significant decisions using architecture decision records and ensure designs remain traceable to product and non-functional requirements.

Lead solution design reviews and assure country-specific solutions against Pluxee global enterprise architecture and security standards.

Modernisation, cloud and DevOps

Shape modernisation roadmaps for legacy .NET applications, including incremental decomposition, API enablement, cloud adoption and technical debt retirement.

Guide the appropriate use of Azure services, containers, application services, messaging, API management, relational and NoSQL data platforms.

Improve continuous integration, continuous delivery, automated quality controls, infrastructure management, observability and release safety.

Promote cost-effective architecture and operational practices, including capacity planning, service ownership and FinOps awareness.

Lead the adoption of reusable global components and shared platforms where they meet UK product and regulatory needs

Security, compliance and operational integrity

Ensure threat modelling, secure design, privacy by design, vulnerability management and data protection controls are integrated into engineering ways of working.

Work with security, risk, architecture and operations stakeholders to