Senior ServiceNow Developer · Oxfordshire, UK

Andrew Parkes

I build things on ServiceNow that actually work in production — not just in the demo. Six years deep, across a law firm running solo and senior delivery at Capgemini. My focus is API architecture, integration engineering, and the kind of platform edge cases that don't appear in any documentation.

aparkes.dev / api / v1
GET https://aparkes.dev/api/v1/developer
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Years in Tech
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Years on ServiceNow
CSA
ServiceNow Certified
ITIL
Foundation Certified
Currently working on
Platform Engineering
ServiceNow Blog
Writing up the undocumented edge cases I've hit in production — things that cost hours to debug and don't appear anywhere on the docs site
API Design
Dynamic API Framework
Config-table-driven Scripted REST endpoints — non-developers onboard new API consumers without touching code
Game Dev · Side Project
Château · UE5
First-person winemaking sim set in the Loire Valley. Very early stage. Very far from my day job.
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About

I'm a senior ServiceNow engineer and integration architect. Six years on the platform — from running an instance completely solo at an 800-person international law firm, to leading complex multi-client delivery at Capgemini's ServiceNow practice.

The work I find genuinely interesting sits at the sharp end of the platform: API design and integration engineering. I've built dynamic API generation frameworks where configuration records define endpoints at runtime with no developer involvement in routine onboarding. I've designed composite authentication architectures layering Bearer tokens, mTLS, and HMAC-signed headers on single outbound calls. I've built ACL-driven payload filtering systems that strip response fields dynamically by calling principal, enforcing data segregation without forking endpoint logic.

I also write about what I find. The platform has a lot of undocumented behaviour that costs senior developers real time when they hit it. If I spend half a day debugging something that has no documentation, I write it up. Someone else shouldn't have to spend that half day too.

ServiceNow Platform
Scripted REST APIsScoped AppsService PortalFlow DesignerBusiness RulesACL DesignITSM · CSM · CMDBAngularJS Widgets
Integration & Auth
REST · SOAPOAuth 2.0 · JWTmTLSOpenAPI/SwaggerMID Server
Process & Compliance
ITILAgile · ScrumPRINCE2ISO 27001GDPR
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Experience

Oct 2023 – Present
Capgemini
Senior ServiceNow Developer
ServiceNow Practice · Public & Private Sector
Architected a dynamic API generation framework — configuration records define endpoints, auth requirements, and payload rules at runtime. Routine API onboarding removed from the developer backlog entirely.
Engineered multi-step transactional APIs with staging, transformation, orchestration, and rollback across live integrations with CRM platforms, middleware, and financial systems.
Designed composite auth flows: Bearer + mTLS + HMAC-signed headers, custom JWT validation, and tenant-aware credential resolution for high-security enterprise consumers.
Delivered ACL-driven payload filtering at the API layer — response fields stripped dynamically by calling principal without forking endpoint logic.
Led backlog grooming and peer review for junior developers; contributed to pre-sales solutioning and client demonstrations.
Oct 2019 – Oct 2022
Fieldfisher
ServiceNow Developer & Administrator
Sole platform owner · 800-person international law firm
Owned the full instance lifecycle: security architecture, ACL design, upgrades, cloning, integrations, and custom application development — without a team.
Built scoped applications, workflows, business rules, client scripts, and integrations from requirements through production sign-off.
Authored an upgrade regression protocol covering multiple major releases — still in active use after my departure.
Dec 2017 – Oct 2019
Fieldfisher
IT Service Desk Technician
Front-line hardware, software, and infrastructure support; identity management; major incident coordination.
2015 – 2017
1Insurer Ltd
Junior Developer & PMO Analyst
HTML/XML defect resolution and template development; Agile/Waterfall planning and vendor management in the PMO function.
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Contact

Let's build something solid.

Complex ServiceNow integrations, platform architecture, scoped application development. Open to senior consulting engagements and contract roles.