Overview

Expleo is seeking an experienced Senior Application Developer / Architect to support a major Public Sector modernisation programme. This is a senior technical role requiring deep expertise in modernising and migrating legacy Java-based applications, designing modern architectures, and guiding technical decision‑making across complex environments. The successful candidate will bring extensive Public Sector experience and play a key role in shaping future-state application architecture and migration strategies.

Responsibilities

Lead the modernisation and migration of legacy Java applications, including Struts (v1 & v2), JSP, JSF, AngularJS and Angular-based solutions.
Define and implement strategies to transition non‑API legacy systems to RESTful API‑based architectures.
Provide architectural oversight for containerised application development aligned with best‑practice engineering principles.
Create high‑quality documentation, including migration playbooks, technical findings, and continuous improvement artefacts.
Apply identity and access management principles including OIDC and OAuth2 across modernised systems.
Contribute to Kubernetes/OpenShift deployment design patterns—e.g., S2I, binary builds, config maps, secrets, sidecars, health probes, circuit breakers.
Collaborate with stakeholders to gain alignment on architectural decisions and migration approaches.

Qualifications

Minimum 7+ years’ experience in senior application development or architecture roles.
Proven Public Sector experience in an Application Architect capacity.

Essential skills

Client-facing skills
People management skills - introducing and building ways in which people can learn from each other, encouraging mentoring and the transfer of knowledge by designing and delivering learning interventions
Team work and emotional intelligence
Good self-management – continuous performance is both an objective and a mind-set
High value on openness and transparency

Experience

Strong expertise across Java-based legacy frameworks (Struts, JSP, JSF), modern front-end frameworks (AngularJS, Angular) and modern Java tooling.
Deep experience with Java application servers and servlet containers such as WebLogic, JBoss/WildFly, and Tomcat.
Proficiency in Spring, Spring Boot and/or Quarkus.
Knowledge of modernisation patterns and architectural migration strategies.
Solid understanding of identity and access management (OIDC, OAuth2).
Demonstrated ability to modernise large, complex Java codebases within the Public Sector.
Hands‑on experience with Kubernetes/OpenShift deployment patterns. [Job Descri...Architect | Word]
Proven track record of documenting and standardising technical learnings through playbooks or knowledge-sharing artefacts.

Benefits

At Expleo, we are committed to providing a competitive salary and substantial benefits offering with unique wellbeing, financial and employee recognition programmes.

We pride ourselves on our diverse and inclusive culture and offer a variety of family friendly policies and enhanced leave to help you achieve a healthy work life balance.

By providing significant learning and development opportunities, we encourage individual growth and success throughout your career with us.

Collaborative working environment – we stand shoulder to shoulder with our clients and our peers through good times and challenges
We empower all passionate technology loving professionals by allowing them to expand their skills and take part in inspiring projects
Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses
Competitive company benefits such as medical and dental insurance, pension, life assurance, employee wellbeing programme, sports and social events, birthday hampers and much more!
Always working as one team, our people are not afraid to think big and question the status quo.

“We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age”.

At Expleo, we understand that many people experience impostor syndrome throughout their lifetime, please do not let this discourage you from applying for this role. Our Talent Acquisition Team welcomes all CV’s and will consider your application in line with the values, requirements and role competencies.

Senior Application Architect - Public Sector Experience

Benefits

Job Description