Cloud Architect PHP Tomcat Middleware - C.

About Proximus NXT

Proximus NXT Luxembourg supports all organizations in their digital transformation, by providing holistic ICT & Telecommunication solutions, as well as tailored managed services. With our partners and customers, we co-create opportunities and enable growth in a secure and sustainable manner. As a result of our unique expertise in next-gen IT services, mobile and advanced connectivity, we help our customers achieve their ambitions and realize their vision.

Together with them and our partners we implement sovereign and trusted solutions that make people work smarter.– www.proximusnxt.lu

Your mission :

We are seeking an experienced Cloud Architect with deep specialisation in PHP and Apache Tomcat runtimes to join the COSMOS Architecture team. This is a technical leadership position requiring both the strategic vision to drive platform modernisation and the hands-on expertise to deliver actionable, squad-ready architecture across a hybrid environment spanning private and public clouds.

Overall Job Description

The Cloud Architect (Application & Middleware) operates within the COSMOS Architecture Office Chapter and will be part of the Middleware Squad. This role owns the reference architectures for PHP, Apache Tomcat, and related application-layer services. It drives their modernisation into container-native deployment patterns and ensures platform-wide consistency in how multi-application workloads are deployed, governed, and observed.

The role works closely with the DevOps chapter, peer Technical Architects, the Solution Architecture team, and Product Office to ensure standards are clearly defined, understood by delivery squads, and reflected in the COSMOS service catalogue. The postholder will author Architectural Decision Records, contribute to the Architecture Office governance reviews, and provide subject matter expertise to support both the design and hands-on development of future private/public cloud offerings and the definition of sovereign cloud requirements.

Professional Skills

• Strong expertise in designing container-native architectures, including runtime configuration management and multi-application deployment patterns within Kubernetes environments.
• Strong knowledge of Java application servers (Apache Tomcat) including deployment architecture, JVM tuning, and multi-application hosting.
• Experience with PHP runtime environments including configuration and performance tuning.
• Proficiency with Apache HTTP Server and Nginx as reverse proxies and application front-ends.
• Programming background, with ability to understand application runtime behaviour, troubleshoot performance issues, and review integration patterns.
• Experience with Infrastructure-as-Code and automation tooling (e.g. Ansible, Terraform, Crossplane, etc.).
• Familiarity with API gateway and integration platforms, for example: Tyk and Kong.
• Familiarity with observability principles and tools (e.g. Prometheus, Grafana, ELK Stack, Dynatrace).
• Ability to produce clear architecture documentation including reference architectures, ADRs, and technical standards.
• Strong communication and stakeholder engagement skills across technical and non- technical audiences.

Activities

• Own and maintain the reference architecture for the COSMOS application and middleware layer, covering PHP-FPM, Apache Tomcat, and Apache HTTP Server.
• Define and document standards for multi-application deployment across all supported runtimes, resolving current inconsistencies between the PHP stack and the broader middleware capability set.
• Lead the technical design of containerisation for Kubernetes, including image standards and runtime configuration management.
• Author Architectural Decision Records for application-layer technology decisions.
• Define the integration approach for application-layer services with platform tooling, including API gateways, automation engines, and service catalogues.
• Assist with designing future private cloud offerings and defining sovereign cloud requirements as they relate to the application and middleware layer.
• Define observability requirements for application-layer services, including logging, metrics, and tracing integration.
• Collaborate with the Solution Architecture team and Product Office to translate customer requirements into application-layer designs represented in the COSMOS service catalogue.
• Evaluate emerging middleware technologies and provide adoption recommendations to the Architecture Office.
• Provide guidance and mentorship to other architects and DevOps squads adopting application-layer and container-native technologies.

Your profile :

Qualifications and Experience

• Bachelor's or Master's degree in Computer Science, Information Technology, or a related field.
• Minimum of 8 years of experience in a Cloud, Kubernetes or Application Architecture role with a proven track record in PHP and Apache Tomcat environments.
• Demonstrated experience designing application-layer architectures in enterprise or large-scale managed hosting environments.
• Experience working within a formal architecture governance model.
• Professional certifications in cloud platforms or container technologies are desirable.

Desirable Skills

• Knowledge of workflow automation tooling such as n8n.
• Exposure to service catalogue platforms such as Cycloid or Backstage.
• Familiarity with GitOps tooling such as ArgoCD or Flux.
• Experience with Oracle WebLogic Server architecture and migration patterns.

Behavioural Skills

• Customer-focused with a pragmatic, delivery-oriented approach.
• Builds effective cross-functional working relationships across and challenges constructively where required.
• Draws on experience to resolve complex problems and delivers results consistently.
• Takes responsibility for personal development and stays current with application and middleware technologies.
• Prepared to take on challenges and drive resolution of longstanding platform gaps.

Requirements

• EU citizenship.
• Fluency in English (written and spoken) is required; proficiency in any other European language is a plus.

Our offer :

A professional and stimulating work environment in the IT & telecom sector. Multiple career opportunities within the Proximus Group at national and international level, cutting-edge training in new technologies, a wealth of recognized expertise. We also offer an attractive salary package and many other benefits.

Our company is an equal opportunity employer, valuing diversity in all its forms. We firmly believe that each individual brings a unique richness to our teams, and we are committed to creating an inclusive environment where every voice counts.

If at the end of the process your application is successful, you will be asked to provide an extract from your criminal record. Your personal information will be handled in compliance with applicable data protection laws.