Senior ServiceNow Developer

Senior Service Now Developer

Department: Cyber Services and Capabilities

Employment Type: Full Time

Location: G  Manchester Hardman Boulevard

The Senior Service Now Developer is the most senior hands‑on technical authority for the Service Now platform underpinning our cybersecurity managed services. The role designs, builds and maintains complex, heavily customised applications in an environment where out-of-the-box functionality is not sufficient: scoped applications, custom data models, advanced server- and client-side scripting, and integrations with security tooling and customer environments. It demands expert-level JavaScript, a rigorous approach to performance, maintainability and upgradeability, and the judgement to know when to configure, when to customise, and when to challenge the requirement.

Because the platform delivers a live managed service to external customers, the post holder works directly with customers and service stakeholders on requirements, technical escalations and service impact, and is accountable for solutions that hold up under contractual service commitments. As the technical lead within the development team, the post holder sets the technical standard, owns code review and architectural direction, and mentors and develops the wider team.

• Technical Leadership: Act as the technical authority for the platform: own architectural direction and technical standards, make and document the significant design decisions, and provide the final technical sign-off before code is promoted.
• Complex Application Development: Design and build scoped applications, custom data models and business logic that go well beyond out-of-the-box capability, while keeping the instance supportable and upgradeable.
• Advanced Scripting and JavaScript Engineering: Write, review and refactor advanced server-side and client-side JavaScript across Script Includes, Business Rules, Glide Ajax, Scripted REST APIs, UI Scripts, UI Actions and Service Portal widgets, applying sound engineering practice within the constraints of the platform.
• Customer-Facing Solution Design: Work directly with customers and service stakeholders to shape requirements into technical designs, explain trade-offs and constraints in plain language, and ensure what is delivered is operable within the managed service and its contractual commitments.
• Integrations: Design and build robust integrations with external systems, security tooling and customer platforms using REST and SOAP, including authentication, error handling, retry behaviour and monitoring.
• Platform Health and Upgradeability: Own the technical quality of a heavily customized, multi-customer set of instances: performance tuning, reduction of technical debt, upgrade impact analysis and remediation of skipped or broken customisations.
• Code Review and Technical Standards: Set and enforce coding standards, secure development practice and peer review across the team, and drive consistent, measurable improvement in code quality.
• Complex Troubleshooting and Escalation: Act as the final escalation point for the most complex defects and customer-impacting production issues, including root cause analysis across integrations, ACLs, asynchronous processing and performance, and communicate findings to service and customer stakeholders.
• Mentoring and Capability Building: Coach developers and administrators through pairing, design reviews and technical walkthroughs; grow the technical depth of the team and reduce single points of knowledge.
• Documentation: Produce and maintain technical documentation, integration specifications and runbooks to a standard that allows others to support and extend the work.
• Collaboration: Work closely with Service Now…