Senior Drilling & Well Engineer

Senior Drilling & Well Engineer

Endurance is developing modular seafloor geothermal power plants that harness the vast thermal energy beneath the ocean floor to provide gigawatts of clean, reliable energy. We're addressing the critical power bottleneck facing AI infrastructure development while creating a path toward energy independence and decarbonization across the globe.

Backed by premier venture capital firms including First Round Capital and Point
72 Ventures, our exceptional founding team includes veterans from Space

X, Robinhood, Helion, and Neuralink, with specialized expertise in complex thermal and fluid systems and business development.

We’re seeking a Senior Drilling & Well Engineer to lead the design, execution, and lifecycle integrity of our offshore geothermal wells.

This is a foundational role
: you will architect and operate deepwater drilling systems from first principles, design completion strategies that preserve and protect our thermal resources, and ensure our wells perform reliably in extreme subsea environments. You will own “the hole” — from drill bit selection and hydraulics to casing design, cementing strategy, zonal isolation, and long‑term well integrity — and play a central role in proving and scaling a new class of offshore energy infrastructure.

As a Senior Drilling & Well Engineer, you will design and operate deep offshore drilling systems capable of safely and efficiently constructing geothermal wells beneath approximately one mile of water. You will be responsible for the full well architecture — drilling methodology, casing and cement design, zonal isolation philosophy, completion strategy, and long‑term thermal and mechanical integrity.

You will blend rigorous theoretical understanding (rock mechanics, wellbore stability, hydraulics, thermal stresses, cement chemistry, fracture behavior) with deep field experience. This is not a desk‑only role. We are looking for someone who has personally drilled challenging wells, solved real‑world problems at the rig site, and understands the difference between a clean model and a messy ocean.

You will work cross‑functionally with geoscience, subsea systems, power cycle, and operations teams to ensure our wells maximize flow, protect reservoir integrity, prevent scaling and unwanted mixing, and interface cleanly with subsea generation systems. As we scale, you will either continue as a highly leveraged senior individual contributor or build and lead a world‑class wells team.

• Architect and design deepwater geothermal well systems from spud to completion
• Develop drilling programs including BHA design, hydraulics modeling, torque & drag analysis, mud program, and trajectory planning
• Design casing and cementing programs for thermal gradients, long‑term integrity, and reservoir protection
• Lead zonal isolation and completion strategy to prevent unwanted fluid mixing and preserve resource longevity
• Define well control philosophy appropriate for non‑hydrocarbon, high‑temperature offshore environments
• Serve as technical owner for our custom seafloor drilling robot, working directly with the vendor to define requirements, review designs, and drive upgrades
• Contribute to the mechanical, hydraulic, and control system architecture of the seafloor drill system to ensure it is fit‑for‑purpose for geothermal wells
• Lead offshore drilling operations from our vessels, operating and optimizing the seafloor drill system in real‑world conditions
• Work alongside offshore contractors and internal teams to execute drilling campaigns safely and efficiently
• Troubleshoot real‑time drilling and equipment issues under offshore operating constraints
• Develop risk registers and mitigation strategies for well construction, equipment reliability, and lifecycle integrity
• Integrate well design with subsea power pod and production system requirements
• Establish engineering standards, documentation practices, and operational discipline appropriate for deepwater drilling systems
• Mentor future well engineers and help build the wells organization as we scale

• 10+ years of experience in offshore drilling and well engineering, with meaningful…