Firmware Engineer

Firmware Engineer

Location: Barcelona Type: Full-time

Were hiringand were doing it the Frekuent a world where technology moves fast we move with purpose. If youre ready to make your next big move and create something meaningful youre in the right place.

Being part of our dream team isnt just about a job its about enjoying the frekuency. If youre ready to be part of this journey and grow together join us and make a real impact.

Get to know us

Frekuent is a fast-growing company redefining the payment experience helping businesses turn one-time buyers into lifetime clients through unique loyalty boosters. We believe that the secret to more sales is giving customers less: cashless contactless and effortless payment solutions that transform the way businesses operate. With Frekuent transactions happen in seconds keeping customers coming back for seconds.

Want to know more Check us out at .

What youll do

At Frekuent were not just building payment solutions were creating seamless experiences that move businesses and customers forward. As a Firmware Engineer youll help build and evolve the core software that runs on our unattended POS device and connects the physical world with our app and cloud services.

This role is hands-on and high ownership: youll build and maintain the software that runs on our devices improve reliability over time and support real-world deployments as we scale.

What youll be doing:

• Develop and maintain the C runtime/service that powers our devices core functionality on Android (long-running process robustness performance memory safety)
• Implement and evolve machine communication layers (e.g. RS232-based integrations and related protocol stacks) including configuration and operational edge cases
• Own connectivity and device-to-cloud communication including cellular/WiFi/BLE behavior and MQTT-based telemetry and operational messaging
• Integrate with the Android APK through ZMQ protobuf ensuring reliable coordination between payment/UI flows and machine actuation
• Provide L3 technical support when incidents occur: interpret logs reproduce issues deliver fixes and improve the system to prevent recurrence
• Strengthen engineering quality through CI/CD improvements automated testing and expanding coverage (including off-target/simulation workflows where applicable)
• Maintain clear technical documentation for internal teams (and when needed for external stakeholders)

Who were looking for

• Bachelors degree in Computer Science Telecommunications Engineering Electrical/Electronics Engineering or a related field (or equivalent practical experience)
• Proven experience building production firmware / embedded software or low-level systems software in fast-moving environments
• Strong proficiency in C and disciplined engineering practices (debugging code quality testing mindset maintainable design)
• Comfortable with networking and device connectivity concepts (e.g. TCP/IP behavior unreliable networks reconnection strategies field diagnostics)
• Able to ramp quickly take ownership end-to-end and balance feature development with production support and continuous hardening
• Fluent in English and Spanish with excellent communication and organizational skills.
• Strong execution and problem-solving skills youre not afraid to tackle challenges head-on.
• Takes accountability and consistently owns the outcome throughout the process.
• Embraces feedback as an opportunity for growth.
• Naturally proactive always looking for ways to move projects forward.
• Comfortable speaking up and proposing bold creative ideas that add value.

While its not required its an added plus if you also have:

• Experience on Linux/embedded Linux and/or Android (AOSP) user/kernel space including practical debugging and performance troubleshooting
• Experience collaborating with hardware/ODM partners: defining requirements reviewing specs/designs and supporting bring-up or validation
• CI/CD and test automation experience for embedded/system software (unit/integration tests; hardware-in-the-loop exposure is a plus)

Whats in it for you

A hybrid model that works Enjoy the energy of our office 3 days a week and the flexibility of working remotely the other 2.

Flexible schedule because we trust you to own your time and your outcomes.

Meal vouchers Enjoy a monthly support of meal vouchers to make your workdays tastier.

Health & wellness private health insurance and discounted gym memberships to keep both body and mind in top shape.

Learning & development English classes and role-specific training because your growth is part of our journey.

23 days of paid time off plus local holidays because great ideas need space to rest.

A dynamic fast-growing environment where each day is unique and every idea counts.

A collaborative mindset surrounded by people who genuinely enjoy building together.

Regular afterwork & teambuilding events activities to relax connect and strengthen team bonds.

Why youll love it here

At Frekuent we believe our success is built on our people. Were a team of non-conformists committed and solution-driven individuals who know that infinity is the limit when it comes to innovation. With plenty of room for personal and professional development we value creativity ownership and collaboration all driven by a strong culture that fuels our growth.

Be authentic isnt just a value its our belief that embracing who we are and appreciating diverse backgrounds experiences and opinions is what truly enriches us.

If youre ready to jump into an exciting environment and make a real difference this is the place for you.

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