ServiceNow Developer

Join One Advanced

We are looking for an experienced Senior Service Now Developer – Now Assist & TPSM to take agreed requirements and process designs through to working, tested, supportable configuration on the Service Now platform. This role makes the technical decisions that determine whether a solution scales, performs, and can still be maintained three releases from now.

You will be the senior technical voice in the Workflow Development team — building the platform's generative AI capability into live service operations, extending TPSM to support how we serve our customers, and setting the build standards the rest of the team works to. You will be expected to challenge requirements where a simpler or more sustainable technical approach exists, and to be clear about where AI genuinely earns its place and where it does not.

• Designing and building solutions across the Service Now platform, with particular focus on Now Assist capabilities (generative AI skills, AI agents, Virtual Agent, AI Search) and the TPSM product suite.
• Configuring and tuning Now Assist skills — including prompt design, grounding against the right data sources, and evaluating output quality before release.
• Building and extending TPSM capability, including case management, install base and product catalogue, entitlements, order management and Service Bridge integrations where relevant.
• Translating requirements and process designs into technical designs, then into configuration and code, making and documenting the trade‑offs along the way.
• Support in the building integrations between Service Now and adjacent systems using the appropriate pattern (REST/SOAP, Integration Hub, Flow Designer, MID Server) and defending the choice of pattern.
• Writing and maintaining automated and manual unit tests, and supporting the Business Analyst through end‑to‑end and multi‑application testing.
• Owning the technical quality of releases — code review, adherence to platform best practice, upgradeability, and keeping customisation to the minimum the requirement genuinely needs.
• Taking changes through platform governance, including CAB submission, technical risk assessment and post‑release verification.
• Setting the team's development standards and definition of done, and technically guiding and mentoring other developers.
• Diagnosing and resolving complex platform issues, including those arising from Service Now family releases and upgrades.
• Working with the Business Analyst, process leads and SMEs to challenge requirements where a better technical approach exists.

• 6-8 years hands‑on Service Now development experience, including complex, multi‑application delivery.
• Deep working knowledge of the platform: data model, ACLs, Flow Designer, Business Rules, Script Includes, Client Scripts, UI Builder or Service Portal, and release management via update sets or source control.
• Strong JavaScript, with the judgement to know when scripting is the right answer and when configuration is.
• Practical experience building with Now Assist — generative AI skills, AI agents or Virtual Agent — in a production or near‑production setting, not solely proof of concept.
• Experience with TPSM, CSM or a comparable customer‑facing Service Now product line, including install base and entitlement models.
• Proven integration experience across REST/SOAP, Integration Hub and MID Server, including authentication, error handling and volume considerations.
• Experience through full family release upgrade cycles, with an understanding of what makes a build survive them.
• The ability to explain technical decisions and risk clearly to non‑technical stakeholders, and to push back constructively when a requirement is unworkable.
• Experience…