Sensor Systems & Validation Engineer

Safety Bolt; Stockholms kommun; On-site; SEK 750,000 - 950,000; Full time

Job summary

Safety Bolt is seeking a driven sensor characterization engineer to define and execute the full validation program for our bolt-sensor platform. You will design experiments, establish methodologies, and determine what the sensor can predict with confidence, collaborating with firmware and mechanical colleagues to translate findings into system specifications.

Ideal candidates have a strong background in analog electronics, instrumentation, and measurement science, with a track record in

Qualifications

• 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.

Responsibilities

• Design and execute a systematic test and validation program for the Sensor, from component to full system under real-world conditions.
• Define the sensor operating envelope: boundary conditions, measurement uncertainty, and statistical confidence.
• Develop test fixtures, measurement protocols, and custom test setups for ESR and impedance characterization.
• Work with unknown-variable scenarios: test with a known bolt type but unknown environmental context.
• Define production test procedures and input to calibration routines for scale.
• Collaborate with FW and ME to translate test results into requirements.
• Gradually take increasing ownership of the analog front-end design as the team matures.

Skills

Analog electronics

Measurement systems

Experiment design

Statistical analysis

Signal processing

DOE

Education

MSc in Electrical Engineering

BSc with strong analog & instrumentation background

Tools

Oscilloscopes

Impedance analyzers

Signal generators

Lock-in amplifiers

Job description

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 are building 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 47000 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.