Senior Platform Architect · Oxfordshire

Andrew Parkes

ServiceNow Engineer · Integration Architect · MQL5 Developer

I design and build systems that sit at the intersection of platform engineering, enterprise integration, and automation. Six years deep on the ServiceNow platform — from sole instance owner to senior delivery lead at Capgemini. Separately, I run live algorithmic trading systems on XAUUSD.

ServiceNow Work → EA & Trading → Get in touch
andrew@aparkes.dev — profile
➜ cat stack.json
{
  "role": "Senior Developer",
  "company": "Capgemini",
  "platform": "ServiceNow",
  "certs": ["CSA", "ITIL", "PRINCE2"],
  "specialisms": [
    "API Architecture",
    "Integration Design",
    "Scoped Apps",
    "Auth Engineering"
  ],
  "trading": "GoldBreak · XAUUSD",
  "available": true
}
0
Years in Tech
0
Years on ServiceNow
0
EA Win Rate
CSA
ServiceNow Certified
// 01

About

I'm a senior ServiceNow engineer and integration architect with six years of platform experience — from running an instance solo as the sole developer at an 800-person international law firm, through to leading complex multi-client delivery at Capgemini's ServiceNow practice.

My depth is in API design and integration engineering. I've built dynamic API generation frameworks where configuration records define endpoints at runtime, layered composite authentication systems combining Bearer + mTLS + signed headers, and ACL-driven payload filtering architectures that enforce data segregation without forking endpoint logic — work that's genuinely novel within the platform ecosystem.

Outside the platform, I design and operate algorithmic trading systems in MQL5. GoldBreak runs live on XAUUSD via IC Markets. The same discipline that makes good software makes good trading: data-driven decisions, version governance, and no guesswork.

ServiceNow Platform
Scripted REST APIs Scoped Apps Service Portal Flow Designer AngularJS Widgets ITSM · CSM · CMDB Business Rules ACL Design
Integration & Auth
REST · SOAP OpenAPI/Swagger OAuth 2.0 · JWT mTLS MID Server
Process & Compliance
Agile · Scrum ITIL ISO 27001 GDPR PRINCE2
Algorithmic Trading
MQL5 MetaTrader 5 XAUUSD Backtesting
// 02

Experience

Oct 2023 – Present
Capgemini
Senior ServiceNow Developer
ServiceNow Practice · Public & Private Sector
▸Architected a dynamic API generation framework within a scoped app — configuration records define endpoints, auth requirements, and payload rules at runtime, eliminating developer involvement from routine API onboarding.
▸Engineered multi-step transactional APIs with staging, transformation, orchestration, and rollback across live integrations with CRM platforms, middleware, and financial systems.
▸Designed composite authentication 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, enforcing multi-tenant data segregation without forking logic.
▸Ensured ISO 27001 and GDPR compliance across all integration work; contributed to pre-sales solutioning, effort estimation, and client demonstrations.
▸Led backlog grooming and peer review for junior developers; mentored on best practices and platform architecture patterns.
Aug – Oct 2022
Fieldfisher
ServiceNow Developer (Contract)
▸Delivered workflow automation, reporting enhancements, and REST/SOAP integrations against a mature, regulated instance with zero tolerance for downtime.
▸Rebuilt Service Portal views using AngularJS and custom widgets to client branding specification.
Oct 2019 – Aug 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, complex workflows, business rules, client scripts, and third-party integrations from requirements through production sign-off.
▸Authored an upgrade regression protocol across multiple major releases — a structured testing and certification process that remained in active use after departure.
Dec 2017 – Oct 2019
Fieldfisher
IT Service Desk Technician
▸Front-line hardware, software, and infrastructure support; identity and access management; major incident coordination — the operational foundation that grounded the transition into full platform development.
2015 – 2017
1Insurer Ltd
Junior Developer & PMO Analyst
▸HTML/XML defect resolution and template development as a junior developer; Agile/Waterfall planning, resource management, and vendor coordination in the PMO function.
// 03

Dedicated Work

// Platform Engineering
ServiceNow
Architecture
6+
Yrs on Platform
CSA
Certified
∞
APIs Built
Deep dives into the undocumented corners of ServiceNow — dynamic API generation, composite authentication architectures, GlideRecord edge cases, ACL payload filtering, and upgrade governance. Articles written from production experience.
Scripted RESTScoped AppsAuth DesignFlow DesignerService PortalITSM · CSM
View full page →
// Algorithmic Trading
GoldBreak EA
& MQL5
87%
Win Rate
7.6%
Max Drawdown
Live
IC Markets
Architecture and version history of GoldBreak — a session-aware Donchian channel breakout Expert Advisor running live on XAUUSD M1. Backtesting methodology, pyramid scaling design, and MQL5 development patterns.
MQL5MetaTrader 5XAUUSDDonchianIC MarketsBacktesting
View full page →
// 04

Contact

Let's build something solid.

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

✉andrew@aparkes.dev inlinkedin.com/in/andrew-parkes2 ✆07548 764372 ⬡aparkes.dev
Certifications
SN
ServiceNow Certified System Administrator (CSA)
IT
ITIL Foundation · AXELOS
P2
PRINCE2 Practitioner · AXELOS
AG
Agile & Scrum (Certified)
Based in Oxfordshire, UK · Open to remote & hybrid