We are hiring! Join LuxQuanta as a Field Service Engineer

At LuxQuanta, we are pioneering the Quantum Communications industry with quantum physics-based security solutions. As we expand internationally, we're looking for a passionate

Field Service Engineer to act as the face of LuxQuanta at customer premises, owning the end-to-end deployment and onboarding journey.

About the Role As Field Service Engineer, you’ll bridge post-sale customer onboarding, site readiness, installation, and hands-on commissioning. You combine technical depth, strong ownership, and a customer-oriented mindset to ensure flawless deployments, resolve unexpected field issues autonomously, and turn every customer into a reference story.

With your true Startup DNA, you bring a pragmatic, highly versátil mindset, ready to step into adjacent operational areas to ensure complete project success.

Main Tasks & Responsibilities

End-to-End Onboarding & Deployment:

Lead pre-installation planning, site surveys, and readiness requirements (rack space, power, optical infrastructure, and access procedures).

System Installation & SAT:

Install, configure, and test LuxQuanta QKD systems at customer sites in Spain and abroad, validating optical link quality (OTDR, loss budgets) and executing Site Acceptance Tests (SAT).

Autonomous Troubleshooting

Lead on-site and remote troubleshooting, escalating structured technical feedback to R&D; and Support teams to drive issues to closure.

Customer Advisory & Training:





Conduct on-site knowledge transfer for customer operators and serve as a trusted technical voice across technical and management levels.

Field Feedback & Hand-over:

Document all interactions in CRM/ticketing systems, maintain installed-base records, and help improve deployment playbooks and manuals with R&D.;

Degree in Telecommunications, Electrical/Electronic Engineering, Computer Science, Physics (photonics), or IT.

5–7+ years in customer-facing technical roles, including hands-on experience installing and commissioning telecom, networking, or optical equipment.

Fluency (spoken & written) is mandatory, as you will interact daily with international technical teams and management at their facilities. Spanish is also required.

Travel Availability

High availability to travel frequently to customer premises in Spain and internationally (up to 75% of total working time) and valid driving licence.

Solid foundation in networking (TCP/IP, routing, switching, VLANs), Linux environments (SSH, CLI, scripting with Bash/Python), and fiber-optic handling (connectors, OTDR, power meters).

Familiarity with network security concepts (PKI, TLS, IPsec, firewalls) and monitoring protocols (SNMP, REST APIs) is highly valued.

Highly autonomous, cool-tempered under pressure, with a valid driving licence and willingness to travel frequently (up to 75% internationally/nationally).

Flexible working hours & Barcelona-based location

Short Fridays in summer & real growth opportunities in a vibrant team

We are committed to building a diverse and inclusive workplace where every voice contributes to solving genuinely hard problems.

Ready to secure the future of communications?

📌 Field Service Engineer (Madrid)
🏢 LuxQuanta
📍 Madrid