Safety Bolt

Safety Bolt We're Safety Bolt and given our recent €2.6M fundraise and €13M LOI, we're seeking highly driven, top 1% talent to join our team and scale our monitoring solution to a multi billion euro infrastructure market. If you're simply looking for a job, this is not for you. We seek highly motivated people who proactively and obsessively strive to solve novel problems all the way to product launch and beyond, fundamentally changing the way we build, maintain and monitor physical structures. What we do We build retrofittable sensors that measure the clamping force inside a bolted joint. Using magnetostrictive sensing, each sensor reads the stress in a standard steel bolt without touching it and without modifying the joint, then reports over LoRaWAN to a cloud platform where trend analysis reveals developing risk long before an inspection would. It clips on in under a minute and delivers structural integrity data for up to twenty years. Bolted joints hold up critical infrastructure everywhere: wind energy, bridges and civil infrastructure, rail, tunnels and mining, and heavy process industry. A single wind turbine alone holds over a thousand bolts whose tension is checked by hand, if at all, and loss of preload is one of the main drivers of structural failure. The same sensor addresses all of them. Why now With ex-McKinsey leadership, we have developed and patented industry-leading technology over the last 7 years and recently reached a technical breakthrough, enabling an oversubscribed seed round with top-tier investors (to be announced), selection as one of Sweden's top 33 startups, a place in NATO's DIANA program chosen out of 3400 startups, and a Letter of Intent to purchase 47 000 sensors. Vision: Become the leading structural integrity data provider globally Target: Volume production and distribution of retrofitted sensors, providing 20 years of structural integrity data Culture: Truth seeking, high agency, pragmatic, entrepreneurial and hypothesis driven Seeking: Exceptional drive, intelligence and integrity. Lead rather than follow. ___ The Role You will build the Safety Bolt firmware stack from the ground up: architecting, implementing, and owning the embedded software for our wireless sensor node. You will work on a modern low-power embedded platform with wireless connectivity, including LoRaWAN and BLE. You will implement signal processing algorithms developed in collaboration with our data science team, and progressively take ownership of algorithm development as the product matures. This is a senior, architecture-level role: you set the direction, not just write the code. What you will do Design and implement the embedded firmware architecture for the Safety Bolt sensor node, from prototype to production-ready Implement on-device DFT-based signal processing and take increasing ownership of algorithm tuning and development Work at the hardware/software boundary: bring up new hardware revisions, debug analog signals, collaborate closely with the EE on measurement quality Build firmware with a product mindset from day one: structured, testable, and on a path to wireless certification (CE/FCC) Contribute to system-level decisions across the full sensor stack Must have Strong embedded C/C++ development for microcontrollers, bare-metal and/or RTOS Experience architecting embedded systems from the ground up; you have owned a firmware stack end-to-end Hands-on with wireless protocols: BLE and/or LoRa/LoRaWAN Comfortable at the hardware boundary: oscilloscopes, logic analyzers, analog signal debugging Experience developing firmware intended for commercial products and certifications, not only prototypes Ability to work independently with high ownership and low need for hand-holding Nice to have Experience with Zephyr RTOS or similar embedded operating systems Background in DSP or signal processing implementation on embedded targets Experience with low-power embedded design for battery-operated IoT devices Exposure to wireless certification processes (CE, RED, FCC) Experience implementing ML inference or statistical models on embedded hardware Background from industrial sensors, measurement equipment, or precision IoT Education MSc in Embedded Systems, Electrical Engineering, Computer Engineering, or equivalent. A BSc will be considered given strong, documented experience. Experience level 5+ years of embedded systems development, with a clear track record of owning and delivering complete firmware stacks. We are looking for someone who has already made the architecture decisions, not someone learning to.

Safety Bolt We're Safety Bolt and given our recent €2.6M fundraise and €13M LOI, we're seeking highly driven, top 1% talent to join our team and scale our monitoring solution to a multi billion euro infrastructure market. If you're simply looking for a job, this is not for you. We seek highly motivated people who proactively and obsessively strive to solve novel problems all the way to product launch and beyond, fundamentally changing the way we build, maintain and monitor physical structures. What we do We build retrofittable sensors that measure the clamping force inside a bolted joint. Using magnetostrictive sensing, each sensor reads the stress in a standard steel bolt without touching it and without modifying the joint, then reports over LoRaWAN to a cloud platform where trend analysis reveals developing risk long before an inspection would. It clips on in under a minute and delivers structural integrity data for up to twenty years. Bolted joints hold up critical infrastructure everywhere: wind energy, bridges and civil infrastructure, rail, tunnels and mining, and heavy process industry. A single wind turbine alone holds over a thousand bolts whose tension is checked by hand, if at all, and loss of preload is one of the main drivers of structural failure. The same sensor addresses all of them. Why now With ex-McKinsey leadership, we have developed and patented industry-leading technology over the last 7 years and recently reached a technical breakthrough, enabling an oversubscribed seed round with top-tier investors (to be announced), selection as one of Sweden's top 33 startups, a place in NATO's DIANA program chosen out of 3400 startups, and a Letter of Intent to purchase 47 000 sensors. Vision: Become the leading structural integrity data provider globally Target: Volume production and distribution of retrofitted sensors, providing 20 years of structural integrity data Culture: Truth seeking, high agency, pragmatic, entrepreneurial and hypothesis driven Seeking: Exceptional drive, intelligence and integrity. Lead rather than follow. ___ The Role This is not a conventional test engineering role. You will define and execute Safety Bolt's entire sensor characterization and validation program: designing the experiments, building the methodology, and finding the answers ourselves, since many of them do not yet exist. Your core task is to determine what the sensor can and cannot predict, under what conditions, and to what statistical confidence. You will work creatively across analog electronics, signal processing, and experimental design, and collaborate tightly with the firmware and mechanical engineers to translate findings into system specifications. Analog electronics competence is your foundation; curiosity and experimental rigor are what will make you excellent in this role. What you will do Design and execute a systematic test and validation program for the Safety Bolt sensor, from individual component characterization to full system behavior under real-world installation conditions Define the sensor operating envelope: boundary conditions, measurement uncertainty, and statistical confidence requirements Develop test fixtures, measurement protocols, and custom test setups for ESR and inductance characterization Work with unknown-variable scenarios: what can we predict with a known bolt type but unknown environmental context? Design the experiments that answer this Define production test procedures and give input to calibration routines, so that quality and consistency can be ensured at scale Collaborate with FW and ME to translate test results into requirements and guidelines Gradually take increasing ownership of the analog front-end design as the role and team mature Must have Solid foundation in analog electronics and measurement systems Ability to design, execute, and evaluate systematic test programs: from experiment design through statistical analysis Hands-on with measurement instrumentation: signal generators, impedance analyzers, oscilloscopes, lock-in amplifiers, or similar Comfort with open-ended experimental work where the methodology itself needs to be invented Cross-disciplinary thinking: prepared to work across electronics, signal processing, and algorithms as the problem requires High ownership: you define the test agenda, not just execute someone else's plan Nice to have Experience with analog front-end design, resonance circuits, or impedance spectroscopy Background in sensor characterization, measurement physics, or instrumentation engineering Experience with statistical experimental design (DOE) or measurement uncertainty analysis Knowledge of signal processing: DFT, FFT, frequency-domain analysis Experience developing custom test fixtures or measurement setups Background in industrial sensing, precision electronics, or research instrumentation Education MSc in Electrical Engineering, Engineering Physics, Measurement Technology, or equivalent. A BSc with strong analog and instrumentation background will be considered. A research background (PhD or industry research) is equally relevant; the role values scientific rigor over formal title. Experience level 3-6 years in a role involving measurement systems, sensor characterization, analog electronics, or experimental engineering. A conventional test engineer background is not required; we are equally interested in candidates from instrumentation, applied research, or precision measurement.

Safety Bolt We're Safety Bolt and given our recent €2.6M fundraise and €13M LOI, we're seeking highly driven, top 1% talent to join our team and scale our monitoring solution to a multi billion euro infrastructure market. If you're simply looking for a job, this is not for you. We seek highly motivated people who proactively and obsessively strive to solve novel problems all the way to product launch and beyond, fundamentally changing the way we build, maintain and monitor physical structures. What we do We build retrofittable sensors that measure the clamping force inside a bolted joint. Using magnetostrictive sensing, each sensor reads the stress in a standard steel bolt without touching it and without modifying the joint, then reports over LoRaWAN to a cloud platform where trend analysis reveals developing risk long before an inspection would. It clips on in under a minute and delivers structural integrity data for up to twenty years. Bolted joints hold up critical infrastructure everywhere: wind energy, bridges and civil infrastructure, rail, tunnels and mining, and heavy process industry. A single wind turbine alone holds over a thousand bolts whose tension is checked by hand, if at all, and loss of preload is one of the main drivers of structural failure. The same sensor addresses all of them. Why now With ex-McKinsey leadership, we have developed and patented industry-leading technology over the last 7 years and recently reached a technical breakthrough, enabling an oversubscribed seed round with top-tier investors (to be announced), selection as one of Sweden's top 33 startups, a place in NATO's DIANA program chosen out of 3400 startups, and a Letter of Intent to purchase 47 000 sensors. Vision: Become the leading structural integrity data provider globally Target: Volume production and distribution of retrofitted sensors, providing 20 years of structural integrity data Culture: Truth seeking, high agency, pragmatic, entrepreneurial and hypothesis driven Seeking: Exceptional drive, intelligence and integrity. Lead rather than follow. ___ The Role You will be Safety Bolt's internal expert on bolted joint mechanics, material behavior, and structural integrity, and much more besides. In a company of this size, your role will be broad by design: you will contribute to sensor fastening concept development, own the mechanical design of test equipment, and act as a technical sounding board across the team. The foundation of the role is deep knowledge of how bolted connections work, how they fail, and what governs their behavior over time. On top of that, you will need to be comfortable rolling up your sleeves and doing hands-on mechanical work, CAD, and creative problem-solving, often in areas that cross into electronics and measurement. What you will do Be the internal expert on bolted joint mechanics: preload, friction, relaxation, and failure modes Lead or contribute to concept generation and evaluation for how the Safety Bolt sensor fastens to bolts, assessing concepts for installation simplicity, manufacturability, and long-term retention security Own the mechanical design of in-house test rigs and custom test equipment built with or for external partners Contribute to material selection, tolerance analysis, and structural decisions in the product design Act as a cross-disciplinary partner to EE and FW: the person who grounds system-level discussions in mechanical and materials reality Carry out CAD work in the early phase; over time, hand off CAD execution while maintaining design ownership Must have Solid knowledge of bolted joint mechanics: preload theory, friction coefficients, relaxation, and failure modes Materials engineering foundation: understanding of steel alloys under stress, fatigue loading, surface treatment, and corrosion Comfortable working across a broad and shifting scope, from detailed design work to technical discussions with external test institutes and partners Hands-on and experimental mindset: willing to build, test, adjust, and iterate on physical hardware CAD proficiency for design of mechanical components and fixtures (SolidWorks, CATIA, Creo, or equivalent) High ownership and independent drive: you define your own work agenda and take problems to conclusion Nice to have Experience designing mechanical test fixtures or custom structural test setups Background in industries where bolted joint integrity is safety-critical: wind energy, heavy infrastructure, mining, marine, or process industry Experience working with external test institutes or structural certification bodies Familiarity with fatigue analysis or FEM for structural components Interest in or exposure to sensor technology and measurement systems Experience in a startup or small-company environment with a broad and evolving scope Education MSc in Mechanical Engineering, Materials Engineering, Structural Engineering, or equivalent. A BSc with substantial, documented experience in bolted joint mechanics or structural integrity is considered. Experience level 5+ years in mechanical engineering with clear, documented exposure to bolted joint systems, fastening technology, or structural integrity in a load-bearing context. We are not looking for a generalist who has encountered bolts; we are looking for someone for whom this is a professional specialty.