HX5 Sierra, LLC.
Sierra Lobo offers a full range of professional and technical capabilities, including Test and Evaluation, Systems Engineering, and Advanced Technologies. Sierra Lobo was founded in 1993 by engineers, who worked together for a large engineering firm on a contract at NASA’s Plum Brook Station in Sandusky, Ohio.
When that firm elected not to bid on Plum Brook’s Test Site Operations Contract, the SLI owners realized that their dream to build their own engineering company could become a reality.
The founders filed incorporation papers in 1993 in the name of Sierra Lobo, which means “mountain wolf” in Spanish. The name celebrates the heritage of President George A. Satornino and exemplifies the spirit of the company they wanted to build. The wolf symbolizes freedom, the spirit of nature, resourcefulness, and adaptability even under the most dire circumstances.
The founders formed the company to emphasize these innovative qualities.
Setting up shop in the Satornino family’s attic, they began to build the company with proven processes and procedures gained from their many years of technical experience, including:
- Conducting thermal/vacuum, propulsion system, and flight hardware tests involving cryogenic systems, hydrogen, and oxygen
- Working in various industries such as naval nuclear power, the glass industry, and aerospace
- Performing space simulation testing, including thermal vacuum testing of large-space hardware, as well as launch vehicle propellant systems testing
- Civil Engineering, Construction Engineering
- Program Management
Sierra Lobo won our first Test Operations contract in 1994 and opened our doors with nine employees on September 1, providing engineering test support service to NASA Plum Brook. Sierra Lobo is an AS9100 and ISO 9001:2008 certified company. Additionally, we have been appraised at Maturity Level II of CMMI for Development v1.2 by an SEI-authorized Lead Appraiser.
Search among HX5 Sierra, LLC. jobs
| Jobs: 1 - 10 of 19 |
Research Laboratory Mechanic - Licensed High Pressure Boiler Operator (PTC)
Sandusky, Ohio
Research Laboratory Mechanic - Licensed High Pressure Boiler Operator (PTC) Location US-OH-Sandusky Job ID 2026-3359 # Positions 1 Experience (Years) 4 Type of Position Regular Full-Time Level Skilled Trade/Journey Level Visa Requirements C...
10h
| Job Type | Full Time |
Mechanical Test Engineer - ISP Exhaust System (PTC)
Sandusky, Ohio
Mechanical Test Engineer - ISP Exhaust System (PTC) Location US-OH-Sandusky Job ID 2026-3355 # Positions 1 Experience (Years) 2 Type of Position Regular Full-Time Level Experienced (Non-Manager) Visa Requirements Citizen only Overview The T...
10h
| Job Type | Full Time |
Mechanical Test Engineer - ISP LH2/GH2 System (PTC)
Sandusky, Ohio
Mechanical Test Engineer - ISP LH2/GH2 System (PTC) Location US-OH-Sandusky Job ID 2026-3357 # Positions 1 Experience (Years) 2 Type of Position Regular Full-Time Level Experienced (Non-Manager) Visa Requirements Citizen only Overview The T...
10h
| Job Type | Full Time |
Mechanical Test Engineer - ISP Fluids and Gas (PTC)
Sandusky, Ohio
Mechanical Test Engineer - ISP Fluids and Gas (PTC) Location US-OH-Sandusky Job ID 2026-3358 # Positions 1 Experience (Years) 2 Type of Position Regular Full-Time Level Experienced (Non-Manager) Visa Requirements Citizen only Overview The T...
10h
| Job Type | Full Time |
Mechanical Test Engineer - ISP LOX/GOX System (PTC)
Sandusky, Ohio
Mechanical Test Engineer - ISP LOX/GOX System (PTC) Location US-OH-Sandusky Job ID 2026-3356 # Positions 1 Experience (Years) 2 Type of Position Regular Full-Time Level Experienced (Non-Manager) Visa Requirements Citizen only Overview The T...
10h
| Job Type | Full Time |
Journeyman Research Laboratory Mechanic (RLM) Technician - Fuel Cell Test Facilities
Cleveland, Ohio
Journeyman Research Laboratory Mechanic (RLM) Technician - Fuel Cell Test Facilities Location US-OH-Cleveland Job ID 2026-3327 # Positions 1 Experience (Years) 4 Category Technical - Mechanical Type of Position Regular Full-Time Level Skill...
10h
| Job Type | Full Time |
Journeyman Research Laboratory Mechanic (RLM) 2 - Materials & Structures Labs - INTERMITTENT
Cleveland, Ohio
Journeyman Research Laboratory Mechanic (RLM) 2 - Materials & Structures Labs - INTERMITTENT Location US-OH-Cleveland Job ID 2026-3348 # Positions 1 Experience (Years) 8 Category Technical - Mechanical Type of Position Intermittent Level Sk...
2d
| Job Type | Full Time |
Mechanical Test Engineer - Fuel Cell
Cleveland, Ohio
Mechanical Test Engineer - Fuel Cell Location US-OH-Cleveland Job ID 2026-3347 # Positions 1 Experience (Years) 1 Category Engineering - All Openings Type of Position Regular Full-Time Level Mid-Level (Non-Manager) Visa Requirements Citizen...
2d
| Job Type | Full Time |
Mechanical Test Engineer (PTC)
Sandusky, Ohio
Mechanical Test Engineer (PTC) Location US-OH-Sandusky Job ID 2025-3258 # Positions 1 Experience (Years) 2 Type of Position Regular Full-Time Level Experienced (Non-Manager) Visa Requirements Citizen only Overview The Test Facilities Operat...
6d
| Job Type | Full Time |
Computer Science Engineer INTERN
Cleveland, Ohio
Computer Science Engineer INTERN Location US-OH-Cleveland Job ID 2026-3344 # Positions 1 Experience (Years) 1 Category Engineering - All Openings Type of Position Intern (Full Time) Level Experienced (Non-Manager) Visa Requirements Citizen ...
6d
| Job Type | Intern |