Senior Firmware Developer

Аbout Shelly
We make smart devices and push the boundaries of the IoT sector every single day. Shelly is a strong company with a startup mindset — no bureaucracy, just bold ideas, creative problem-solving, and a team that genuinely loves what they do.
 
 We turn every spark of an idea into a real product — from first concept to full production — and bring smart automation to over 3 million households around the world. From heating, lighting, appliances, curtains, and more — if it runs on electricity, chances are we can automate it. We’ve built over 100 smart devices (and counting!), and everything happens right here at our headquarters in Sofia.

Sounds exciting? Keep reading...

 

Senior Firmware Developer

Your Role
 You build reliable, high‑performance firmware for our smart home devices — owning features end‑to‑end from feasibility to production. You partner closely with Product, QA, Frontend, Backend, and Tech Support to ship secure, maintainable code and mentor teammates along the way.

Job requirements

What makes you a great fit:

 • You have 5+ years of experience developing embedded firmware for microcontroller-based products (Espressif, Qualcomm, Renesas, etc.)
 • You are proficient in C/C++
 • You have a solid understanding of Linux
 • You have a background in real-time signal processing and hardware integration
 • You know networking and communication protocols
 • You are familiar with version control systems, preferably Git
 • You understand both analog and digital hardware (nice to have)
 • You bring experience in IoT device development (nice to have)
 • You are proficient in additional programming languages (Python, Go, etc.) (nice to have)

Job responsibilities

• Conduct feasibility analyses
 • Triage technical requirements
 • Design, implement, debug, and maintain complex firmware features
 • Perform peer reviews and provide mentorship
 • Maintain internal and public firmware documentation
 • Collaborate closely with adjacent teams: PO, QA, Frontend, Backend, and Tech Support

Job benefits

What is in it for you

Work:
 • A welcoming, collaborative team
 • Meaningful products and services that people actually use and love.
 • Learning opportunities to sharpen your skills
 • Competitive salary + Performance bonuses
 • Modern office in a great location
 • Fun team buildings and company events

Lifestyle:
 • 26 days of paid annual leave
 • Flexible working hours
 • Additional health insurance
 • Free access to all Shelly devices (yes, you can smarten up your whole home!)
 • Multisport Card
 • Fully sponsored yearly public transport card
Ready to join the Shelly Revolution?
 
 Let’s build the future of smart living together.
 Hit that Apply button — we can’t wait to meet you.