Principal Engineer

Pluxee is a global player in Employee Benefits and Engagement that operates in 28 countries. Pluxee helps companies attract, engage, and retain talent thanks to a broad range of solutions across Meal & Food, Well-‏being, Lifestyle, Reward & Recognition, and Public Benefits. Powered by leading technology and more than 5,600 engaged team members, Pluxee acts as a trusted partner within a highly interconnected B2B2C ecosystem made up of more than 500,000 clients, 37 million+ consumers and 1.7 million+ merchants. Conducting business for more than 45 years, Pluxee is committed to creating a positive impact on local communities, supporting well-‏being at work for employees, and protecting the planet.

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 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. 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. ☀️ Happy at work

1. A meaningful job: Be the change! Help us build the future of employee benefits by bringing to life sustainable and personalized experiences and contribute to make a real impact on millions of lives. Our business model delivers not just for individuals but their communities too, by supporting local businesses and economies.
2. A great culture: People matter - a lot! Be part of a multicultural team that moves as one in a fast paced and innovative environment. We respect and care authentically about our people, we embrace well-being and work-life balance, new ideas and we have a lot of fun!