Guillermo Lamarca
Quantity Surveyor · Data centres · Cost and contracts
Commercial management of critical infrastructure from live construction and expansion through to pre-construction, combining cost control, FIDIC contracts and tendering.
01 · Profile
My work is centred on data centre construction and the commercial information needed to keep it under control. Over more than six years with Grupo Cobra, I have contributed across clients and project stages: delivery cost control, expansion works, FIDIC contract administration, change and claims, commercial mobilisation and tender preparation. My background in architecture and civil works supports a technical reading of the scope behind each quantity, risk and commercial decision.
02 · Areas of practice
Project commercial management
Commercial oversight throughout the delivery and expansion of construction projects.
- Budgets and forecasts
- Valuations and certifications
- Commercial reporting
Contracts and change
Contract administration and decision traceability, with particular experience in FIDIC environments.
- Variations and claims
- Risk and commercial exposure
- Final accounts
Tendering and procurement
Building commercial submissions from quantity take-off through to final presentation.
- Measurement and cost build-ups
- Supplier and subcontractor enquiries
- Quotation analysis
Technical coordination
Reading design, construction and documentation together to support commercial decisions.
- Discipline interfaces
- Progress monitoring
- Document management
03 · Professional experience
Grupo Cobra · Data centre construction
A continuous progression across critical-infrastructure projects: from live construction cost control to FIDIC contract administration and the commercial preparation of new tenders.
Jan 2026 — Present
Zaragoza
Data centre tendering
Grupo Cobra · Microsoft and AWS
Supporting the tender team in building the commercial and contractual basis of bids for new data centre projects.
- Quantity take-offs, cost build-ups and tender pricing.
- Supplier and subcontractor enquiries, bid comparisons and quotation analysis.
- Consolidation of tender budgets and preparation of commercial submissions.
- Review of conditions, commercial risks, clarifications and qualifications.
Sep — Dec 2025
Huelva
Commercial and contract mobilisation
Grupo Cobra · Cepsa · La Rábida Energy Park
A short-term assignment during mobilisation of a new biofuels plant, applying complex-project controls in an industrial environment.
- Structured the project’s commercial and contractual management.
- Established cost-control, reporting and contract-administration workflows.
- Organised documentation to improve visibility, traceability and change control.
May 2023 — Sep 2025
Madrid
FIDIC commercial and contract management
Grupo Cobra · CyrusOne
Commercial responsibility across the delivery and expansion phases of a large-scale data centre.
- Budget, cost control, forecasts and periodic reporting.
- FIDIC administration, notices, variations, cost deviations and claims.
- Monthly valuations, client certification and subcontractor application validation.
- Coordination with cost consultants, engineering, delivery teams and supply chain.
- Procurement support, expansion packages and final-account development.
Aug 2020 — Sep 2023
Zaragoza
Commercial control during construction
Grupo Cobra · AWS
Cost management for the construction of two data centres under the client’s cost-control and reporting requirements.
- Client-facing budgets, internal reviews, forecasts and commercial reporting.
- Monthly valuations, substantiation of change and final-account support.
- Monitoring of progress, cost deviations and commercial exposure.
- Procurement and tendering for expansions and additional work packages.
2018 — 2019
Technical Draftsperson
SISENER Ingenieros
Technical documentation for electrical substation projects and document management across several commissions.
2016 — 2017
Technical Draftsperson
IDOM
Technical design and development for energy, data centre, industrial building and transport infrastructure projects in international contexts.
2015
Technical Draftsperson
TECNITOP
Three-dimensional modelling using photogrammetry, drones and 3D scanning for territory, heritage and facilities.
2013
Technical Draftsperson
Nathalie Larradet Architecte
Supported refurbishment, housing and bioclimatic building projects, from survey and design through to documentation and site follow-up.
04 · Transferable experience
Delivery
- Progress monitoring
- Interface coordination
- Multidisciplinary teamwork
Commercial
- Cost control
- Contractual change
- Procurement and final accounts
Technical and data
- Modelling and documentation
- Measurement and analysis
- Information traceability
05 · Tools and methods
Methods
- Quantity take-off and cost build-ups
- Budget control and forecasting
- FIDIC contract administration
- Commercial reporting
- Procurement and comparative analysis
Tools and techniques
- Advanced Microsoft Excel
- AutoCAD and Revit
- Document control and traceability
- 3D modelling and photogrammetry
06 · Education
2017 — 2019
Degree in Architecture
University of Zaragoza
2013 — 2015
Advanced Technician in Civil Works
CPIFP Corona de Aragón
2011 — 2013
Advanced Technician in Building Construction
CPIFP Corona de Aragón
07 · Now
Working on
Data centre tenders: quantity take-offs, budgets, market enquiries and commercial submissions.
Deepening
Reading cost, contract and risk together during the early stages of a project.
Exploring
The relationship between digital tools, traceability and commercial decisions.
08 · CV
09 · Contact
Would you like to discuss work or collaboration?