EnduroSat is a Sofia, Bulgaria-based space infrastructure company that designs, manufactures, launches, and operates standardized, software-flexible satellites for commercial and institutional customers worldwide. Its product portfolio spans CubeSats through ESPA-class FRAME satellites (200 kg to 1–5 tons), along with a full range of satellite subsystems including onboard computers, communication antennas, power modules, and solar panels. The company's constellation-as-a-service model lets customers go from idea to orbit in roughly six months, with mission costs reduced by up to 3,000× compared to traditional space data providers.

EnduroSat's production philosophy treats satellites like industrial products rather than one-off bespoke builds. Its Sofia Space Center features an ESPA-class production line capable of delivering two satellites per day, using AR-guided assembly stations, AGVs, and 86% automated testing across ISO 6 cleanrooms. The company has launched over 100 satellites into orbit, deployed more than 5,000 modules in space, and served 450+ customers including NASA, ESA, IBM, Red Hat, and numerous commercial operators.

On the commercial side, EnduroSat has won major contracts to build 40 satellites for TrustPoint's GPS-independent C-band PNT constellation and 24 satellite buses for Vantor's high-revisit Pulse Earth observation fleet. It operates offices across Bulgaria, France, Germany, Italy, Luxembourg, the United States (Denver, CO), and Japan. The September 2026 $205M raise valued the company above $1 billion, making it Bulgaria's second tech unicorn, and will fund a new U.S. high-volume manufacturing facility and the EU's largest space and defense hub on a former military airbase in Dobroslavtsi.