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Castelion · 1 day ago

Senior IT Service Desk Engineer

Torrance, CA

Full-time

Onsite

Mid, Senior Level

$100K/yr - $135K/yr

4+ years exp

Castelion is bringing a new approach to defense development and production, focusing on short, iterative design cycles and modern manufacturing strategies. They are seeking a Senior IT Service Desk Engineer to provide primary support for IT issues, troubleshoot and resolve service desk tickets, and drive improvements in support processes.

AerospaceGovernmentManufacturingMilitaryNational Security

No H1B

U.S. Citizen Only

Responsibilities

Serve as the primary support point for all end-user IT issues (hardware, software, network, account access, etc.)

Respond to, troubleshoot, and resolve service desk tickets in a timely and professional manner

Document all support cases clearly, including resolution steps, and proactively contribute high quality articles to our internal knowledge base

Support and maintain laptops, peripherals, and software in a 75% Windows / 25% Linux mixed environment

Act as the primary onsite support contact for the Torrance HQ office

Occasionally travel (5-10%) to other sites (e.g., Allen, TX) to provide onsite IT support or assist with deployments

Identify and recommend process improvements to improve end-user experience and operational efficiency

Help drive a culture of empathy and calm under pressure, improving team morale during high-stress moments

Mentor or lead junior IT technicians if/when the team scales

Qualification

IT support experienceTroubleshooting skillsWindows/Linux proficiencyDevice managementCommunication skillsLeadership aspirationsMentorship experience

Required

4+ years in a service desk or IT support role, with senior or lead-level experience

Proven experience supporting engineering companies, DoD contractors, or fast-paced, startup-like environments

Exceptional troubleshooting skills across hardware, OS (Windows/Linux), mobile, VPN, and enterprise software suites (e.g., Office 365)

Work tightly with a range of other IT and engineering departments to find efficiency gaps and push for solutions that will make a real impact & save people time

Excellent communication and interpersonal skills you make IT support feel like a positive experience

Able to prioritize tasks effectively and work independently under pressure

Comfortable managing multiple tasks or escalations in a dynamic setting