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Location: Barcelona | Type: Full-time
We're hiring—and we're doing it the Frekuent way. In a world where technology moves fast, we move with purpose. If you're ready to make your next big move and create something meaningful, you're in the right place.
Being part of our dream team isn't just about a job, it's about enjoying the frekuency. If you're ready to be part of this journey and grow together, join us and make a real impact.
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 www.frekuent.com.
At Frekuent, we’re not just building payment solutions — we’re creating seamless experiences that move businesses and customers forward. As a Firmware Engineer, you’ll 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: you’ll build and maintain the software that runs on our devices, improve reliability over time, and support real-world deployments as we scale.
Develop and maintain the C runtime/service that powers our device’s 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)
Bachelor’s 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 — you’re 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 it’s not required, it’s 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)
🌍 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.
At Frekuent, we believe our success is built on our people. We’re 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 isn’t just a value, it’s our belief that embracing who we are and appreciating diverse backgrounds, experiences and opinions is what truly enriches us.
If you're ready to jump into an exciting environment and make a real difference, this is the place for you.
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