Senior Embedded/Firmware Engineer (freelance)

Stack

Responsibilities

• ▹Plan, develop and ship firmware for connected devices: wearables, audio, health-tech hardware
• ▹Gather and analyze requirements from clients, then turn them into something that works on real silicon
• ▹Consult clients and internal teams on stacks, tools and trade-offs
• ▹Work with mobile, backend and QA so the device and its companion app understand each other over BLE
• ▹Test firmware releases and write documentation
• ▹Estimate your own work and flag risks early
• ▹Push for better practices: code reviews, patterns, knowledge-sharing
• ▹Use AI tools as part of the daily workflow

Requirements

• ▹4+ years of professional firmware development
• ▹Strong C/C++ for embedded systems
• ▹Hands-on ESP32 experience, including ESP-IDF and ESP-ADF
• ▹STM32 experience in production projects
• ▹Solid Bluetooth knowledge: BLE, Bluetooth Mesh, and comfort across the stack layers
• ▹Toolchain fluency: CMake, GCC, Python-based tooling
• ▹Familiarity with IoT protocols like MQTT and WebSockets
• ▹A feel for the connected device landscape: IoT, home automation, wearables, automotive
• ▹English at B2+, written and spoken
• ▹Self-reliance, ownership and clear communication

Nice to have

• ▹Rapid hardware prototyping on Arduino, Raspberry Pi, BeagleBone, Nucleo
• ▹Working knowledge of LoRa, Zigbee, Thread, Wi-Fi and other networking standards
• ▹Fleet deployment and management with AWS IoT Core, GCP Cloud IoT, Azure IoT or similar
• ▹Cryptography in embedded contexts
• ▹Audio paths: encoding, decoding, mixers
• ▹Machine learning on embedded targets
• ▹Rust in firmware
• ▹FreeRTOS, Zephyr or other embedded operating systems
• ▹Genuine curiosity about the devices you build, not just the code

Soft skills

What we offer

• ▹135-180 PLN/h net B2B, depending on experience
• ▹Truly flexible hours
• ▹Fully remote, with an optional pet-friendly Warsaw office and Gdansk coworking space
• ▹Internal knowledge-sharing: tech talks, experiments, side projects
• ▹After the first 3 months, a path to a permanent contract with a fixed monthly salary, 26 days paid leave, 10 sick days, Saltus medical care and a training budget
• ▹Technical buddy during onboarding

About the company

Intent has been designing and co-creating connected devices since 2008: wearables, smart audio and health-tech hardware for clients such as Oura and BOSE. A fully remote team of 60+ people, with most projects being long-term partnerships.