Stephane Altis

Senior Engineer with 8+ years of experience delivering major tunnelling, transport, underground, and infrastructure projects across Australia and France. Strong background in drill-and-blast and roadheader excavation methods, geological mapping, geotechnical risk management, ground support systems, instrumentation, and project delivery. Experienced leading site teams, mentoring engineers, coordinating stakeholders, and providing technical leadership on complex underground works.

CPS Geotechnical Project Engineer at Ferrovial (2024-02 – 2025-12)

Supported delivery of a $2.2B highway upgrade involving three tunnels and major interchange infrastructure using drill-and-blast excavation methods.

• Managed tunnel portal excavations, geological mapping activities, and ground support recommendations including rock bolts and soil nails.
• Led monitoring programs using prisms, inclinometers, and piezometers, implementing risk-based actions to maintain excavation safety and production continuity.
• Interpreted probe drilling data, groundwater inflows, and geological conditions to optimise excavation approaches and support requirements.
• Produced monthly geotechnical reports, composite mapping, RFIs, and design modification recommendations while coordinating with designers and construction teams.
• Led and mentored a team of 3 field geotechnical engineers while providing technical leadership to construction and supervisory teams.

Project Engineer Geotechnical at John Holland Group (2022-10 – 2024-02)

Provided geotechnical support across tunnels, 2 deep shafts (~250 m), caverns, and underground infrastructure excavation activities.

• Delivered geological mapping and support recommendations for drill-and-blast excavation activities to support safe production outcomes.
• Managed monitoring systems, QA/QC activities, RFIs, technical documentation, and excavation support requirements.
• Coordinated supply and construction interfaces for reinforcement, concrete, anchors, and geotechnical materials.
• Produced monthly reporting and productivity analysis supporting construction planning and decision-making.

Engineering Geologist at Tetra Tech Coffey (2022-05 – 2022-10)

• Conducted geological mapping for motorway tunnel excavation using roadheader methods and Sydney Rock Mass Classification.
• Identified geotechnical hazards and recommended additional support requirements including shotcrete and spot bolting.
• Performed endoscope and borehole investigations to assess geological conditions and support excavation decisions.

Geotechnical Engineer at Bouygues Construction Australia (2019-10 – 2021-10)

Supported tunnelling operations across multiple excavation fronts and contributed to management of up to 10 active excavation headings.

• Delivered geological mapping, probe investigations, and ground support recommendations during tunnel advancement.
• Updated geological models and communicated ground condition risks to project leadership teams.
• Monitored design compliance and escalated support non-conformances and excavation risks.

Geotechnical Engineer – Site Investigations at GEOTEC (2017-09 – 2019-09)

Managed investigation programs supporting major metro extension works and infrastructure projects.

• Supervised drilling campaigns, pressuremeter testing, packer testing, slug testing, and laboratory investigations.
• Managed subcontractors, planning activities, budgets, and reporting deliverables.
• Provided technical recommendations to clients regarding investigation methodologies and geotechnical risks.

Master Degree in Geological Engineering – Paris-Saclay University (2018)

Honours Degree in Mineral and Petroleum Resources Exploration – Rennes 1 University (2016)

Bachelor Degree in Earth Sciences – University of the French West Indies and Guiana (2013)