Our client, a prominent player in the Defence & Security sector, is currently looking for an Applications Support Engineer to join their dynamic team based in Harlow (Hybrid). This position is a Fixed Term Contract for 12 months, offering full-time hours of 37 hours per week. The successful applicant must be SC eligible. About the Role: The Applications Support Engineer will become part of the wider Data and BI Product Family, initially focusing on technical deployment and application support for a major financial planning transformation. This role involves a close working relationship with programme teams and Digital Technology functions such as Architecture, Security, and Operations. Strong technical troubleshooting skills and hands-on experience with financial planning platforms are essential. Key Responsibilities: Deployment & Technical Support: Support the initial deployment, configuration, and technical validation of the new financial platform. Provide hands-on troubleshooting and issue resolution across application, interface, and configuration layers. Work closely with infrastructure, network, and security teams to ensure end-to-end environment readiness. Collaboration & Cross-Functional Engagement: Collaborate with key programme stakeholders including Architecture, Engineering, Programme Delivery, QA, and Finance Operations. Participate in Agile ceremonies and contribute to iterative delivery cycles, backlog refinement, and continuous improvement. Assist in interpreting architectural and design requirements into actionable support tasks. Operational Readiness & Transition: Prepare the wider support organisation for steady-state operations by developing documentation, standard operating procedures, and knowledge articles. Deliver training and knowledge-transfer sessions to ensure operational teams can confidently support the live Finance platform. Contribute to hyper-care and early life support activities post-go-live. Monitoring, Incident Management & Continuous Improvement: Implement and maintain monitoring solutions to ensure system availability and performance. Manage incident triage, root cause analysis, and problem resolution for platform-related issues. Identify opportunities to enhance stability, resilience, and operational efficiency of the platform. Job Requirements: Essential: Experience in application support, ideally with finance platforms, OneStream in particular. Strong understanding of Service Management frameworks such as ITIL. Solid background in: Operating system management (Windows/Linux) Application troubleshooting and performance optimisation Log analysis, system monitoring, and incident management Ability to collaborate effectively with technical and non-technical stakeholders. Experience working in structured delivery environments; familiarity with Agile ways of working is advantageous. Desirable: Experience in support of a wide range of Data and MI/BI platforms. Experience supporting applications in regulated industries (e.g., government, aerospace, and defence). Knowledge of integration concepts (ETL, Event, APIs, message-based interfaces). Exposure to deployment automation or DevOps practices. Personal Attributes: Strong analytical and problem-solving mindset. Clear communicator able to work across diverse technical teams. Proactive, collaborative, and committed to delivering high-quality support. Adaptable, eager to learn, and able to transition seamlessly between project and BAU contexts. If you are a dedicated and skilled Applications Support Engineer looking to contribute to national security projects within a supportive and innovative environment, apply now to join our client's esteemed team in Harlow.