Pluxee
Principal Engineer
Milton Keynes
Posted about 15 hours ago
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Job Description: Principal Engineer at Pluxee
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.
As a Principal Engineer you will be expected to:
- Own and influence end-to-end technical direction across product discovery, design, delivery, and operation. This involves 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, establish engineering guardrails, manage technical debt, and ensure 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 leads 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.
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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 address audit findings and maintain evidence of appropriate controls.
- Define non-functional requirements and acceptance criteria for availability, recoverability, performance, security, accessibility, and support.
- Ensure technical designs include suitable monitoring, alerting, backup, disaster recovery, and incident response considerations.
You Are a Match If…
Education:
- A degree in Computer Science, Software Engineering, or related discipline, or equivalent professional experience. Relevant Microsoft Azure or architecture certifications are advantageous.
Work Experience:
- Extensive experience designing, building, and operating enterprise-grade.NET products, with demonstrable technical leadership across multiple delivery teams or complex platforms.
- Deep practical knowledge of C#, modern.NET, ASP.NET Core, RESTful APIs, distributed systems, asynchronous messaging, and SQL-based data platforms.
- Experience modernising legacy.NET Framework applications, including MVC, Entity Framework, T-SQL, stored procedures, Web API, SOAP, and WCF integrations.
- Strong knowledge of software architecture and design patterns, domain-driven design, modular architecture, microservices trade-offs, integration patterns, and API lifecycle management.
- Hands-on experience with Azure services such as App Service, Functions, Service Bus or queues, API Management, Azure SQL, Cosmos DB, containers, and monitoring services.
- Strong understanding of CI/CD, automated testing, code quality controls, observability, incident diagnosis, reliability engineering, and DevSecOps practices.
- Knowledge of application security, identity and access management, OWASP guidance, threat modelling, privacy by design, and relevant compliance requirements.
- Experience producing high-quality architecture artefacts, including context and container views, integration diagrams, data-flow diagrams, deployment views, technology roadmaps, and architecture decision records.
- Ability to communicate complex technical issues clearly to engineers, product stakeholders, senior leaders, auditors, and suppliers.
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Desirable Technical Skills:
- Experience in payments, prepaid cards, employee benefits, rewards, vouchers, cashback, or regulated financial services.
- Experience with frontend or cross-platform technologies such as Blazor, modern JavaScript frameworks, or .NET MAUI.
- Experience operating in a multi-country enterprise and integrating global platforms with country-specific products.
- Understanding FinOps, cloud cost optimisation, accessibility standards, and software supply-chain security.
Languages:
- Fluent English; French is advantageous
Location:
- Hybrid - Milton Keynes office.
Why Join Pluxee?
- Join an inclusive team
- Work at the heart of the community alongside 5,000 experts across 29 countries - we embrace diversity and value uniqueness, fostering a workplace where everyone can thrive.
- Turn inspiration into possibility
- Get space to try new ideas, experiment, and move the world of work forward as you bring new digital experiences - and moments of connection - to millions of people.
- Make a positive impact
- Touch millions of lives and create meaningful change for people and the world we share, supporting our commitments to diversity, sustainability, and local economies.
- Grow with us
- Get support you need to take meaningful steps in your career, whether you're performing your work/life balance or learning new skills.
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