Manager, Piping Design & Engineering

Department: Plant & Process Engineering

Location: Houston, TX, San Francisco HQ

Compensation: $170K – $210K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.

Employment Type: FullTime

About Mariana Minerals

Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.

Role Overview

We are hiring a Manager, Piping Design & Engineering to build and lead the piping discipline behind our refining and minerals processing facilities. The team, the 3D model, the design workflows, and the standards every piping deliverable comes out of.

You will own Mariana's piping design group: the designers who build the model, the stress engineers who validate it, and the staff-aug, high-value engineering center, and EPC piping teams that extend it. You own the 3D model as the source of truth, including the metadata behind it, and you develop the workflow that carries a line from P&ID to routed model to stress-checked to supported to issued for construction. You'll also set the stress criteria, own the piping material, valve, and support specifications, and pick up Caesar II or the model yourself when the work calls for it.

What You’ll Do

Lead the piping design team

• Build and lead Mariana's piping design group. Hire, develop, and directly manage piping designers and stress engineers

• Manage the blended delivery team. In-house, staff-augs, high-value engineering centers, and third-party engineering firm piping groups

• Load-balance work across concurrent projects, hold the schedule for piping deliverables, and coach designers through the work

• Attract non-conventional engineering talent to piping design and engineering positions to develop advanced automation solutions

Own the 3D model

• Own 3D model development end to end in Plant 3D and Revit. Plot plan and equipment layout through routing, supports, and IFC isometrics

• Own how the model is built: structure and breakdown, project setup, naming conventions, revision control, and change rights

• Own the spec catalogs and component libraries inside the model, so piping specs are enforced by the model rather than caught in review

• Run 30 / 60 / 90% model reviews and Navisworks clash detection across disciplines, and drive resolution to closure

• Define the model, drawing, and file format requirements EPCs and vendors deliver against, and integrate their content into Mariana's environment

• Keep the model the single source of truth for quantities. Isometrics, BOMs, and take-offs generated from the model, not maintained beside it

• Evaluate and implement state of the art agentic engineering and automation softwares

Develop the design workflows and standards

• Develop and implement the piping design workflow itself. The path from P&ID to IFC, what gets checked at each gate, and who signs it

• Build the standards behind it: piping design criteria, layout and access standards, drafting standards, iso and drawing templates, and support detail libraries

• Establish squad check and design checking practice, with disciplined comment resolution, revision control, and IFR / IFA / IFC issue

• Automate the repetitive work with our software team. Model-to-stress data exchange, spec-driven checks, quantity reporting, and QC scripting

Own the engineering and stress scope

• Own the pipe stress program. Set the criteria, decide which lines are critical, and approve every package before it drives a support or a nozzle

• Direct dynamic analyses. Slug flow, water hammer, relief valve transients, and vibration

• Own piping material specifications, valve specs, and engineering standards, including material selection for hydromet, pyromet, and reagent services

• Design and specify pipe supports, guides, anchors, expansion joints, and specialty components, and own the support detail standards

• Ensure all piping systems comply with ASME B31.3, and B31.1 where applicable

• Drive piping procurement and support construction and commissioning. Bulk material strategy, long-lead valves and specialty items, field RFIs, redlines, and as-built model closeout

What You’ll Bring

• 10+ years in piping design and engineering, delivered in an EPC, EPCM, or owner capital projects environment

• Direct experience managing a piping design department or group

• Demonstrated ownership of 3D model development on a capital project, concept through IFC, including multidiscipline reviews and Navisworks clash detection

• Track record building piping design workflows and standards

• Strong pipe stress background in Caesar II

• Depth in ASME B31.3, including allowable load definition and nozzle load evaluation

• Experience developing piping material and valve specifications and pipe support design criteria

• Bachelor's degree in Mechanical Engineering or a related field

Preferred, but not required

• Professional Engineer (PE) license, or the ability to obtain one

• Mining, mineral processing, metallurgical, chemical, or heavy industrial facility experience

• Slurry, reagent, and high-temperature or refractory-lined piping, including lined and non-metallic materials

• Scripting or model-based automation

Our culture is built on four principles:

Everyone Gets Home Safe. We never put speed or cost ahead of people.

Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.

Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.

Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.

Join us as we build the future of responsible mineral sourcing and supply!