Senior Application Engineer; SIEM

Job Description

Salary Range £44,171 - £61,950

Leonardo UK operates a grade-based salary framework with broad bands. The salary range shown reflects the approved grade band for this role, or a narrower hiring range published within that band, and is benchmarked against the external market. Exceptions above the standard range are managed through governance controls to protect internal equity.

Are you ready to support and enhance enterprise applications that underpin national security and critical services? At Leonardo UK, our Senior Application Engineers play a key role in maintaining and improving business‑critical platforms — ensuring they are secure, scalable, and aligned with operational needs. You’ll work collaboratively across engineering and service teams, contributing to technical delivery and continuous improvement.

Your work at Leonardo UK will see you take the lead in solving customer problems in an agile, innovative and team‑centric manner. The role may involve a blended hybrid working model, with a mixture of working from home and working on site at one of our Leonardo offices to ensure close collaboration with the wider team and with our customers.

Leonardo UK is seeking a Senior Application Engineer to join the Cyber & Security Solutions Division team. This role is focused on delivering, maintaining, and improving platform and systems engineering solutions that underpin critical defence, government and public sector services.

• Support, configure, and enhance security tooling platforms (e.g. SIEM, EDR) that underpin threat detection and response
• Deliver engineering tasks within defined work packages, ensuring alignment with user needs, security requirements, and service‑level objectives.
• Contribute to application architecture, integration, and lifecycle activities under the guidance of senior engineers.
• Collaborate with stakeholders across engineering, service management, and business teams to resolve technical issues.
• Mentor junior engineers and specialists, supporting their development and promoting best practices.
• Participate in continuous improvement initiatives, including automation, documentation, and knowledge sharing.
• Ensure compliance with engineering governance, ITSM processes, and cyber security policies.

• Solid experience in supporting, configuring, and enhancing security tooling platforms (e.g. SIEM, EDR, or similar)
• Ability to solve moderately complex application‑related issues and contribute to secure, scalable solutions.
• Understanding of application lifecycle management, integration patterns, and secure‑by‑design principles.
• Strong communication and collaboration skills across engineering and business teams.
• A proactive mindset with a passion for continuous improvement and knowledge sharing.

• Support, configuration, and enhancement of security tooling platforms (SIEM, EDR, vulnerability management)
• Log and event management including ingestion, parsing, and correlation of system and security logs
• Integration of security tooling with platform, network, and identity services
• Operational support and tuning of security tooling in live environments
• Application lifecycle management (deployment, maintenance, upgrades, decommissioning)
• Integration patterns and identity management (e.g. SSO, RBAC, API integration)
• Secure‑by‑design principles and application security practices
• Technical problem solving and resolution of application‑related issues
• Collaboration with engineering, SOC, and service management teams
• Experience working within security and ITIL‑aligned environments
• Delivery within secure / enterprise / defence environments

• Experience with SIEM / EDR / vulnerability management tools (e.g. Splunk, Trellix, Tenable, or similar)
• SOAR platforms and automation of security response workflows
• Integration with monitoring, alerting, and incident response systems
• Threat detection, analytics, and use case development
• Experience integrating with enterprise services (Active Directory, identity platforms)
• Exposure to Dev Ops / CI‑CD practices
• Experience working in secure or regulated environments