Be part of a long-term projet! We are looking for an Application Engineer for one of our client based in Luxembourg. Freelance contract or permanent contract via a payrolling company Job based in Kirchberg English fluent is mandatory 100% on-site during the first 3 months and then up to 2 remote days per week Business & Domain Engineering Partner with Architects, Product Owners, and business SMEs to shape problems into implementable, testable, traceable requirements Perform end-to-end impact analysis across processes, apps, data, and upstream/downstream integrations Align with target architecture, security standards, regulations, and internal policies Maintain a requirements baseline and manage change through the lifecycle Plan & Analyze Run feasibility and complexity analyses Identify risks with mitigation strategies Assess resource, cost, and schedule impacts System Design Define system designs, integration patterns (API, messaging, events), and data models, so teams build the right interfaces once and integrations stay resilient. Specify integration contracts and interface specs Implement & Integrate Guide implementation, configuration, and migrations, so delivery teams move faster with fewer blocked sprints. Support cloud, hybrid, and on‑prem environments, so your solutions run where the business needs them, with consistent reliability. Transition to Operations Lead production readiness reviews Define runbooks, SLIs/SLOs/SLAs, monitoring, and alerting Operate & Improve Support L2/L3 operations Drive incident analysis, root cause investigations, and post‑mortems Feed operational learnings back into design and backlog Software Engineering Support Embed non‑functional requirements by design Participate in code reviews, design reviews, and technical spikes DevOps, CI/CD & Platform Enablement Collaborate on environment strategy and configuration management - so environments are consistent and releases become routine. Boost efficiency through automation and observability Quality, Risk & Compliance Apply quality‑by‑design, security‑by‑design, and privacy by design Ensure traceability and documentation for regulatory, audit, and compliance Perform risk assessments across performance, security, and operations Keep system documentation as living artifacts (architecture, ADRs, specifications, runbooks) Delivery Execution Operate effectively in Agile/Scrum, hybrid, and traditional models Contribute to backlog refinement, sprint planning, and release planning Support demos, stakeholder feedback, and technical decision forums Act as a delivery enabler balancing business priorities with engineering constraints Application Responsibility (AR) Own assigned applications end‑to‑end across investment and maintenance, so you see the full lifecycle and shape the roadmap. For custom solutions, partner closely with Software Engineers for packaged solutions, drive integration and lifecycle management Share patterns, standards, and lessons learned. Your profile BSc / BA in Computer Science, Software Engineering, Mathematics, or related technical field. Minimum 8 years of experience in application and solution engineering, or software delivery roles. Experience in financial services, Wealth Management, or regulated environments is a strong advantage. Proven collaboration with Software Developers, Architects, DevOps, QA, and Operations teams. Technical Proficiency System and application design, service decomposition, and integration architecture. Data modeling (logical and physical). Integration patterns: REST/GraphQL APIs, messaging, event-driven architectures, batch/file interfaces. Non-functional requirements: performance, resilience, security, observability, scalability. Test strategy, automation, TDD/BDD, contract testing, and quality assurance. CI/CD concepts, release management, environment configuration, and operational readiness. Ability to review and assess code quality for maintainability, performance, and security. Hays plc est l'un des principaux groupes mondiaux de recrutement de professionnels. Hays est l'expert du recrutement de personnes qualifiées, professionnelles et compétentes dans le monde entier. Hays est le leader du marché au Royaume-Uni et en Asie-Pacifique et également l'un des leaders du marché en Europe continentale et en Amérique latine. Hays intervient pour le compte de milliers d’entreprises des secteurs privé et public, sur des postes en CDI, CDD, Travail Temporaire et Contracting. Hays France & Luxembourg compte aujourd’hui plus de 650 salariés répartis au sein de 22 bureaux (Aix-en-Provence, Amiens, Biarritz, Bordeaux, Clermont-Ferrand, Dijon, Grenoble, La Rochelle, Lille, Lyon, Montpellier, Nancy, Nantes, Nice, Paris, Reims, Rennes, Rouen, Strasbourg, Toulouse, Tours et au Luxembourg) couvrant 25 secteurs d’activité.