About SWÖM

SWÖM is a Danish startup founded in 2022 with a mission to increase water safety and help prevent drowning accidents.

We develop smart swimwear for kids with integrated sensors and an automatic inflation system that activates if the user is submerged too deep for too long. The primary use case is children who have stopped using traditional buoyancy aids, allowing them to swim and play freely while adding an extra layer of safety. We are now preparing the next product generation, including alarm, GNSS tracking, and connectivity features.

SWÖM is an early-stage startup based in Copenhagen, where you will work closely with the founding team and have a direct impact on product and technical decisions.

The Role

We are looking for an Embedded Firmware Engineer to take responsibility for the embedded system development at the core of SWÖM’s technology.

You will take part in design, implement, and validate firmware for a safety-critical, battery-powered wearable device, working closely with both hardware and software. The role includes hands-on development, testing, and validation, as well as active participation in technical decision-making.

This position suits someone who is comfortable taking ownership, working across disciplines, and contributing in a small, fast-moving startup environment.

Responsibilities

• Develop embedded firmware for our smart swimwear and base station

• Work with GNSS, BLE, LoRaWAN, and cellular IoT (LTE-M / NB-IoT)

• Build and maintain safety-critical features, including the inflator system and fail-safes

• Optimize for low power consumption and battery life

• Support PCB bring-up, hardware testing, and validation

• Debug real hardware using oscilloscope, logic analyzers, and other tools

• Work closely with the software engineer on BLE communication and data flow to the cloud

• Help decide how things should be built - not just how to implement them

Qualifications

• Strong C/C++ skills for microcontroller programming (e.g. STM32, nRF5x, nRF91xx, etc)

• Experience with embedded connectivity (BLE, GNSS, LoRaWAN, and cellular IoT)

• Experience building low-power, battery-driven devices

• Understanding of safety-critical systems and fail-safe design

• Understanding of UART, SPI, I²C, and sensor integration

• Familiarity with RTOS (ideally Zephyr), build systems, and Git

• Comfortable reading schematics and working close to hardware

• Self-driven, curious, and not afraid to take responsibility

Background

• 3+ years of relevant industry experience and familiarity with safety-critical systems is a strong advantage

• B.Sc. or M.Sc. in Electrical Engineering, Embedded Systems, or similar

Why Join SWÖM

• Work on a high-impact safety product with real potential to save lives

• Close collaboration with the founding team and direct influence on product and technical decisions

• High level of ownership, trust, and responsibility from day one

• Flexible working setup and a pragmatic approach to work–life balance

• Opportunity to shape both the technology and the way we work in an early-stage startup

• Fast learning curve across hardware, software, and IoT systems

• Competitive compensation for an early-stage startup, with equity potential