Senior Hardware Engineer

About you

We're looking for someone who combines strong electronics knowledge with product ownership and practical engineering experience.

• 5+ years of professional experience designing and developing electronic hardware products.
• At least 3 years working on products that reached mass production and real-world deployment.
• Demonstrated experience across the complete product lifecycle:
  • Product specification
  • Electronic design
  • Prototyping
  • Validation
  • Industrialization
  • Production support
• Ability to clearly explain and defend technical decisions made throughout previous projects.
• Availability to travel occasionally to support deployments, suppliers, or other business needs.
• Availability to participate in an on-call rotation, including occasional weekends, to support critical hardware incidents during live events.
• Strong knowledge of digital and analog electronics.
• Experience working with embedded systems based on Linux and/or Android.
• Experience integrating Raspberry Pi, Khadas or similar SBCs.
• Familiarity with common communication interfaces:
  • UART
  • SPI
  • I²C
  • USB
  • Ethernet
  • Wi-Fi
  • Bluetooth/BLE
• Experience using laboratory equipment for debugging and validation.
• Experience with SMD and through-hole soldering.
• Strong understanding of component selection, BOM management and supply-chain constraints.
• Knowledge of European electronic product regulations (CE, RoHS, EMC, Radio).

• PCB design using Altium, KiCad or Eagle.
• Firmware development in C/C++.
• Python scripting.
• CAD and mechanical enclosure design.
• 3D printing.
• IP protection and impact-resistant product design.
• Experience working with Asian manufacturers.
• Battery-powered devices and power management.
• RFID/NFC technologies.
• Barcode and QR readers.
• Thermal printing systems.
• LoRaWAN, Meshtastic or other IoT communication technologies.
• Previous experience mentoring junior engineers.
• Experience in events, ticketing or access-control hardware.

What we're looking for

You'll thrive in this role if you:

• Take ownership from concept to production.
• Make pragmatic technical decisions balancing quality, cost and delivery.
• Feel comfortable working under pressure in business-critical environments.
• Communicate technical concepts clearly to both engineering and non-technical teams.
• Enjoy collaborating across Hardware, Software, Product, Operations and Procurement.
• Are curious, hands-on, and continuously looking for better solutions.

• Degree in Electronics Engineering, Telecommunications Engineering, Industrial Engineering, Automation Engineering or equivalent.
• Candidates with higher vocational education (FP) will also be considered if they demonstrate significantly more than five years of relevant professional experience and a strong portfolio.

• Spanish: Native or C1.
• English: B2/C1 for technical documentation and international suppliers.

At Grupo Casfid, we are the leading event technology company in Spain. We specialize in the use of radio frequency technology (RFID) to improve the attendee experience and the management of musical or sporting events.

Our services include ticket sales, cashless payment, accreditation, access and capacity control, and everything a large event might need.

In 2025, our technology was present at more than 630 events: Mad Cool, Festival de les Arts, Medusa Festival, Viñarock, BIGSOUND, Zevra, Sónar or Arenal Sound, Nomands (Morocco), Afronation (Portugal) and hundreds of others; worked in 11 countries; and selling tickets for concerts by artists such as Jennifer López, Myke Towers, Annuel AA, Melendi, Aitana, Lola Índigo or Dani Fernández, among others.

In total, we have sold more than 36M tickets and more than 22M people have worn our wristband on their wrist.

Sobre el puesto

As a Senior Hardware Engineer, you'll own the complete lifecycle of Fever's hardware solutions-from concept and design to production, deployment, and continuous improvement.

You'll work closely with Product, Software Engineering, Operations, Procurement, and external manufacturers to build reliable hardware products that perform flawlessly in demanding live-event environments.

This is a hands-on role requiring strong technical ownership, practical engineering skills, and the ability to make sound design decisions balancing reliability, cost, manufacturability, and scalability.

• Lead the design and development of hardware products from concept through production and post-launch support.
• Design electronic solutions using microcontrollers and Single Board Computers (Raspberry Pi, Khadas, or similar).
• Build prototypes, validate solutions, and prepare products for mass production.
• Continuously improve existing hardware based on operational feedback and customer needs.
• Design and review electronic architectures, schematics, PCB layouts, and component selection.
• Manage Bills of Materials (BOMs), component sourcing, second-source strategies, and obsolescence planning.
• Define manufacturing requirements and support industrialization processes.
• Collaborate with suppliers and manufacturers throughout production.
• Define validation plans, testing protocols, and acceptance criteria.
• Perform hardware debugging using laboratory equipment (oscilloscope, logic analyzer, multimeter, power supplies, etc.).
• Diagnose production and field issues, identify root causes, and implement permanent solutions.
• Ensure products comply with applicable European regulations (CE, RoHS, EMC, Radio Directives where applicable).
• Plan production capacity according to business needs and event schedules.
• Monitor inventories and component availability.
• Evaluate suppliers and packaging solutions.
• Participate in budgeting and cost optimization decisions.
• Create technical documentation, manufacturing guides, repair manuals, FAQs, and operational procedures.
• Maintain design documentation, firmware versions, BOMs, and change history.
• Train junior engineers on production and repair processes.
• Act as the technical reference for hardware-related incidents.