Firmware Developer

Casambi Technologies; Espoo; Hybrid; EUR 70,000 - 100,000; Full time

Job summary

Casambi Technologies in Espoo, Finland, is seeking an experienced Firmware Developer to join our engineering team. You will design and maintain embedded firmware for wireless Casambi-enabled products built on Nordic platforms, focusing on BLE, mesh networking, and secure OTA updates.

The role blends hardware proximity with system-level thinking, covering device provisioning, cloud service interfaces, and collaboration across hardware, mobile, cloud, and QA teams.

Qualifications

• 5+ years of professional embedded firmware experience.
• Strong C/C++ programming skills.
• Experience with ARM Cortex-M microcontrollers.
• Experience with Nordic SDKs and nRF Connect.
• Knowledge of BLE, mesh, and wireless protocols.
• Experience with RTOS concepts.
• Willingness to learn and use AI-assisted tools.
• Strong problem-solving and collaboration skills.

Responsibilities

• Design, develop, and maintain embedded firmware for wireless products.
• Work with Nordic SDKs and Zephyr-based solutions.
• Implement BLE, Mesh, and other wireless technologies.
• Develop interfaces between embedded devices, mobile apps, gateways, and cloud services.
• Participate in architecture, reviews, testing, and debugging.
• Diagnose cross-domain issues across hardware and software.
• Contribute to device provisioning, security, and OTA updates.
• Collaborate with hardware, mobile, cloud, QA, and product teams.
• Apply AI-powered tools to improve productivity and quality.
• Contribute through full product lifecycle.

Skills

Embedded C/C++

ARM Cortex-M

BLE & Wireless

RTOS concepts

Nordic SDKs

Zephyr RTOS

Tools

nRF Connect SDK

Zephyr RTOS

Job description

Build the intelligence inside connected devices.

We are looking for an experienced Firmware Developer to join our engineering team and help develop the next generation of Casambi-enabled products.

Your primary focus will be embedded software development for wireless devices built on Nordic Semiconductor platforms. You will work with Bluetooth Low Energy (BLE), mesh networking, device communication protocols, and system-level firmware that powers reliable, secure, and scalable lighting control solutions.

This role is ideal for someone who enjoys working close to hardware while also understanding complete system architectures, from embedded devices to mobile applications, gateways, and cloud services. We're looking for an engineer who is curious, continuously learns new technologies, and actively uses AI-powered tools to improve development efficiency and software quality.

What You'll Do

• Design, develop, and maintain embedded firmware for wireless products based on Nordic Semiconductor SoCs


• Develop software using Nordic SDKs, including nRF Connect SDK and Zephyr-based solutions


• Implement and maintain Bluetooth Low Energy (BLE), Bluetooth Mesh, and other wireless communication technologies


• Develop and optimize communication protocols between embedded devices, mobile applications, gateways, and cloud services


• Participate in architecture, design reviews, code reviews, testing, and debugging activities


• Investigate and resolve complex issues across hardware, firmware, wireless communication, and system integrations


• Contribute to device provisioning, security, diagnostics, and over-the-air (OTA) firmware update solutions


• Collaborate closely with hardware, mobile, cloud, backend, QA, and product teams


• Use AI-powered development tools to improve productivity, code quality, troubleshooting, and learning


• Participate throughout the entire product lifecycle, from concept and development to deployment, maintenance, and continuous improvement


• Contribute to multiple products and technology initiatives as priorities evolve

What we're looking for

• 5+ years of professional embedded software or firmware development experience


• Strong C/C++ programming skills


• Experience developing software for ARM Cortex-M based microcontrollers


• Experience with Nordic Semiconductor development platforms and SDKs


• Solid understanding of Bluetooth Low Energy (BLE) and wireless communication principles


• Experience debugging embedded systems using modern development and test tools


• Understanding of RTOS concepts and embedded software architecture


• Experience with communication protocols and device interoperability


• Strong problem-solving and analytical skills


• Ability and willingness to learn new technologies and domains


• Experience using AI-assisted development tools to improve productivity and software quality


• Strong communication and collaboration skills

Highly appreciated

• Experience with nRF Connect SDK, Zephyr RTOS, or Nordic SoftDevice architectures


• Experience with Bluetooth Mesh networking


• Experience implementing secure boot, device security, and firmware update mechanisms


• Experience with Linux-based embedded systems or gateway devices


• Experience with automated testing, CI/CD, and firmware release processes


• Understanding of RF technologies and wireless performance optimization


• Experience bringing products from concept to mass production and customer deployment


• Product-oriented mindset and customer focus

Why join us?

You’ll work on products that combine embedded systems, wireless communication, cloud connectivity, mobile applications, and real‑world customer deployments. This role offers the opportunity to solve challenging technical problems while developing technology used in hundredths of thousands of installations worldwide.

We value engineers who care not only about writing firmware, but also about delivering successful products that solve real customer problems and continue to provide value long after their initial release.

We are looking for product builders, not just firmware developers. Candidates with experience bringing connected products from idea to customer deployment are particularly encouraged to apply.

This role is based at our head office in Espoo, Finland, where most of our team works together in a hybrid setting. To be considered for the position, applicants should already hold a valid right to work in Finland, as we are unfortunately not in a position to support relocation or sponsor work permits for this opening. We warmly welcome applications from all qualified candidates who meet this requirement.

• Applications are processed with the help of AI (for example, to detect and summarize whether criteria are met), but the final assessment is always made by a human.