SAP SuccessFactors
Employee Central core HR design and configuration, position management, and the data model underneath. Deep work on payroll interfaces and the two production releases a year.
HR data governance · Software publishing
I do not hand over a document. I hand over a working system.
Master data governance and delivery on the large HR platforms, SAP SuccessFactors Employee Central first among them, and software I design and run myself. One practitioner, accountable from the workshop to production.
01
Advisory
I work inside the platform: configuration, master data, interfaces, payroll and the decisions that hold them together. When a build slips, I am the person who opens the system.
Currently engaged on the SAP SuccessFactors programme of LVMH.
Platforms
SuccessFactors is my daily platform and my depth. Oracle HCM Cloud and PeopleSoft come from earlier in my career, and I list them because legacy estates outlive their owners.
Oracle HCM Cloud
Core HR and workforce structures, fast formula and HDL loads, extracts for finance and payroll consumers.
PeopleSoft HCM
Legacy estates that still run payroll every month: maintenance, extraction, and the road out toward cloud.
Engagements
- A.01
Data governance and quality
Master data ownership, duplicate detection, mass correction, controlled loads, and an audit trail that holds up. On my current engagement: seven detection levels across 410,000 records, monthly cleansing campaigns on 40 business rules, and a three-consultant programme run against fixed release dates. I define who owns which data and who may change it, then I enforce it in the platform.
- A.02
Deployment
Core HR configuration and multi-country rollouts on SuccessFactors Employee Central, and the two production releases a year on a live platform.
- A.03
Integrations
Payroll, finance, identity and learning systems, file based or API based, monitored, failure handled by design.
- A.04
Transformation
Target operating model, harmonisation across countries, and sequencing that keeps a programme deliverable.
- A.05
Payroll
Interfaces, retroactivity, control reports and reconciliation, in local and outsourced setups.
Sectors served
- Luxury
- Retail banking
- Insurance
- Public transport
- Cinema
- Social housing
Other client names are covered by contractual confidentiality.
02
Compliance
I built and run one tool to the high-risk requirements of the EU AI Act (Regulation EU 2024/1689): human oversight, logging, documentation.
I maintain the regulatory checklist and keep the file audit-ready. GDPR end to end on the HR data domain, Article 50 transparency on my own products, access control and segregation of duties enforced through Role Based Permissions.
03
Products
Not a catalogue. The software is the proof: advisory without execution is only an opinion.
In production
Travel Planner
Real offers first, the story second. An AI trip planner that builds up to five complete trips from your dates, budget and passports, with every price sourced, never invented.
- 01An algorithmic layer first, at zero AI cost: passport and visa eligibility, three years of weather, budget feasibility.
- 02A budget solver prices candidate trips with real flight, hotel and activity offers, then confirms the best ones in real time.
- 03The model writes the itinerary from those facts. It never produces an amount or a link.
- 04Every price line states its status: bookable, observed (dated) or estimated.
- 05AI spend under control: budget fuse, rate limiting and caching, about USD 0.03 per proposal.
- 06Seven languages, about 1,300 pages, GDPR by design, data hosted in the EU.
In production
Vinca
Designed, developed, deployed, secured and brought into compliance by one person.
Scope of work, one hand
- 01Product definition, information architecture and interface design
- 02Front end application, written end to end
- 03Back end services, data model and migrations
- 04Third party API integrations and rate handling
- 05Domain, DNS, certificates and network configuration
- 06Hosting, deployment pipeline, versioning and rollback
- 07Monitoring, logging and error tracking in production
- 08Authentication, sessions and access control
- 09Payments, billing and the subscription lifecycle
- 10Security hardening, secret management and backups
- 11Privacy policy, terms, data retention and GDPR records
- 12Support, and every incident answered by the same person
Norvelis People Analytics
hris-demo.ghi-c.comWorking prototype on synthetic data: governed KPIs with a Data Trust score, duplicate review queue, an assistant that never computes a number. Demo access on request.
04
Evidence
A career, not a season
I have worked on the same family of HR platforms long enough to have seen them upgraded, replaced and inherited.
Enterprise scale
Large groups and multi entity organisations, where a data error reaches payroll the same month.
Worldwide perimeters
Global scopes across regions and legal entities at once, local requirements against central governance. Seven countries integrated after acquisition, the United Arab Emirates among them.
Three working languages
Workshops, documentation and delivery in English, French and Spanish, with the same precision in all three.
05
Founder
GHI Consulting is one person. You speak to the person who does the work, and the person accountable for it.
guillamo.com- Structure
- Single practitioner
- Based in
- Paris
- Languages
- English, French, Spanish
06
Contact
Tell me which platform you run, what has to be delivered, and by when.