Somewhere along a border in eastern Europe, two soldiers are carrying a ground surveillance radar in backpacks. The terrain is too rough for vehicles. They set up the system, switch it on and begin tracking vehicle movement at distances up to 24 kilometres and pedestrians at 10. The radar they are using, the PGSR-3i Beagle, was designed and built by roughly 50 people in Budapest. It is the primary ground surveillance solution for eight to ten NATO member and partner countries. The UK Ministry of Defence ordered 90 units. Poland bought 18. Estonia uses them for border surveillance.
Pro Patria Electronics, founded in 2000, is not widely known outside procurement circles but makes man-portable radars with a low probability of intercept, meaning they are extremely difficult to jam or detect. In its narrow category, Pro Patria has no European competitor, and if the company disappeared tomorrow, NATO armies would lose a capability that nobody else provides.
This pattern repeats across the continent. After scouting more than 500 defence companies across 31 European countries for DefenceJobs.org, we kept finding the same thing: small companies, often with fewer than 50 employees, filling capability gaps no prime contractor bothers to address. They exist because the problem was too niche, too weird or too unglamorous for a company the size of Rheinmetall or Thales to care about, and now they are nearly impossible to replace.
Inflatable Leopards and Danish rockets
The Czech town of Decin, on the Elbe river near the German border, is home to Inflatech, a company that makes inflatable military decoys. Inflatech produces more than 30 models covering tanks, armoured vehicles, howitzers and aircraft, and each one matches the optical, infrared and radar signature of the real thing. An integrated thermal management system replicates multispectral IR signatures. Adaptable passive and active radar cross-sections complete the illusion.
In August 2024, Russian forces tracked a Ukrainian M270 Multiple Launch Rocket System after it fired a salvo near Chervona Dibrova in Sumy Oblast. When they lost sight of the real vehicle, they spotted what they believed was the M270 a few kilometres away and called in an Iskander-M ballistic missile to destroy it. The target was an Inflatech inflatable. A weapon worth roughly $3 million was spent on plastic and air. Radio Prague International has called Inflatech the company that leads the high-end military decoy market, and it holds a NATO supplier code. Founded in 2014, the company now supplies decoys that are absorbing real attacks on real battlefields, and there is no equivalent European manufacturer producing full-spectrum decoys at this level.
The gap-filling dynamic works differently when it comes to sovereign production. SkyPro Propulsion, founded in March 2024, is building Denmark's first rocket production facility at Vandel, a former NATO air base in Jutland. The company plans to produce 122mm rockets and smaller counter-drone rockets using technology licensed from Serbian company EDePro, a technique not currently manufactured anywhere else in the EU. Production is expected to begin in the second half of 2026, with a target of up to 10,000 units per year and around 110 employees.
The facility itself tells a story about European defence. SkyPro is reusing 37 former NATO bunkers originally built during the Cold War to store munitions. Each rocket carries a 24-kilogram warhead and costs roughly €10,000. The emphasis is on supply chain sovereignty: Danish suppliers, EU-based components, no dependency on non-European sources. In a continent scrambling to rebuild its ammunition production capacity, SkyPro exists because Denmark looked at its own industrial base and found a gap that could only be filled by building something new inside old infrastructure.
The rest of the patchwork
Guardiaris in Ljubljana builds LED-based military simulation systems using SLAM technology (simultaneous localisation and mapping) to capture weapon orientation and position in six degrees of freedom. What makes the company unusual is its GUARD simulation engine, the only fully European-developed simulation engine built specifically for military use. Every other option relies on American intellectual property. For a continent that talks constantly about strategic autonomy, the fact that a Slovenian company is the sole provider of a European alternative is worth knowing. Slovenia, a country of two million people, sent 15 companies to Eurosatory 2024.
ACTinBlack builds night vision goggles in Luxembourg, a country not typically associated with military hardware. The DTNVS, introduced in 2020 as an improvement on the company's original 2016 design, weighs 17.9 ounces and is available with L3Harris MIL-SPEC image intensifier tubes, making it one of the lightest and highest-performing binocular night vision systems on the market. ACTinBlack was founded in 2013 and now serves military, law enforcement and civilian customers worldwide.
The deepest layer of this patchwork sits in the supply chain. NanoPyro, based in Nivelles, Belgium, was spun off from the Royal Military Academy of Belgium in February 2023, built on a patent from the RMA's Department of Chemistry and more than 30 years of research into energetic materials. The company develops nanotechnology-based energetic materials using a physical manufacturing process that is waste-free and energy-efficient. In July 2023, NanoPyro was selected by ESA Space Solutions Belgium for incubation at the ESA Business Incubation Centre. Pyrotechnic initiators are critical components in munitions, satellite separation mechanisms and rocket stages. When you fire a missile or separate a satellite from its launch vehicle, something has to start the chain reaction, and NanoPyro is working to be that something for both defence and space applications.
What it means to be irreplaceable
European defence is often described as a pyramid with prime contractors at the top, but the reality looks more like a patchwork of monopolies. In dozens of narrow capability areas, a single company with 10 to 50 employees is the only option. Pro Patria's portable ground radar, Inflatech's multi-spectrum decoys, Guardiaris' simulation engine. If any of them closed, the capability would leave with them because nobody else makes the thing.
For engineers and specialists considering where to build a career, these companies offer something the primes cannot: you own the problem from end to end, there is no other team to hand off to and no competitor's product to benchmark against. The entire European capability in your domain might sit in the same office. You can explore all six of these companies and hundreds more across 31 countries in the DefenceJobs.org company directory, and browse open roles on the jobs board.