Firmware Engineer

Firmware Engineer

Responsibilities

• Develop and optimise the firmware, focusing on secure transactions, NFC communication, and power efficiency.
• Work on low-level hardware drivers inside our MCU (Apollo3 Blue Plus) that power the touch display, battery controller, and communication with the Secure Element (Infineon SLC38).
• Work on higher level firmware code, implementing our custom features.
• Assist on user interface implementations and reviewing them.
• Actively hardening the security of the firmware while you develop, with a keen eye on defensive programming and memory safety.
• Participate in code reviews, (third-party) security audits, and testing to maintain the highest code quality and security standards.
• Collaborate with external vendors like hardware designers and manufacturers.
• Work on secure boot and cryptographic operations to ensure our firmware is resistant to attacks.
• Work closely with our app developers to ensure seamless communication between the mobile app and the hardware via NFC.
• Review pull requests from other team members and manage our issue tracker.
• Be a leading voice in firmware architectural design and development, in collaboration with our CTO Marvin Janssen.
  

Qualifications

• 3-5+ years of experience in firmware development for embedded systems.
• Strong proficiency in C/C++, with experience designing scalable embedded firmware architectures.
• Hands-on experience with NFC communication protocols (ISO 14443, ISO 15693) and embedded NFC firmware development.
• Experience leading firmware architecture design and low-level driver development.
• Strong debugging skills, with experience using oscilloscopes, logic analysers, and debuggers (J-Link, ST-Link, etc.) for low-level firmware troubleshooting.
• Experience with ARM Cortex-M microcontrollers, real-time operating systems (RTOS), preferably FreeRTOS.
• Proven track record of delivering firmware for commercial embedded products.
• Ability to mentor junior engineers and drive best practices in firmware development.
• Experience with Git, CI/CD workflows, and version control best practices. Proficiency in using Github.
• Excellent communication skills in English and ability to work in a remote team.
  

Nice to have

• Experience with LVGL.
• Experience with Rust.
• Deep understanding of secure elements (Infineon) and secure bootloaders.
• Experience with symmetric cryptography and encrypted protocols.
• Experience with asymmetric cryptography like ECDSA or EdDSA.
• Experience working on hardware wallets, secure elements, or financial security devices.
• Experience with JavaCard.
• Experience with open-source security firmware projects.
• Experience contributing to open-source projects.
  

• Even if your profile is not an exact fit, we invite you to send an application anyway if you feel you could rise to the challenge!
  

What We Offer You

• Competitive salary package with a healthcare allowance or contribution.
• Multiple equity package options to align with our long-term success.
• Flexible vacation policy—we believe in life-work balance, not work-life balance.
• Fully remote work environment—join our team from anywhere in the world.
• While we don’t have a physical office yet, we are working towards it. We have team members in Singapore, Malta, and the Netherlands. Depending on your location, a local setup is possible.
• Option to be sponsored for an EP (Employment Pass / work visa) for Singapore.
• Flexible workdays—a 40-hour workweek commitment with flexibility.
• Covered work travel expenses, in agreement with us.
• We organise multiple trips a year for our team members. We all get together at least once per year and there are many opportunities to attend conferences and events as visitors as well as participants.
• Input on products and company direction—your voice matters in shaping our technology.
• Opportunities to obtain additional equity through the planned employee options pool.