EnduroSat is a Bulgarian deep tech scale-up headquartered in Sofia on a mission to transform the complex satellite industry into a streamlined data service. A member of the EIC Scaling Club's New Space group, the company designs, builds, and operates modular satellites that enable public and private organisations to rapidly deploy their own dedicated constellations for communications, earth observation, and advanced applications.
Founded in 2015 by Raycho Raychev, EnduroSat has grown from a four-person team in a Sofia attic apartment into one of Europe's most-funded New Space companies, with over 300 professionals and more than 3,500 modules already in orbit.
The space industry has long operated on a bespoke model: each satellite custom-built for a single mission, at enormous cost and lead time. EnduroSat set out to break that mould. From the outset, the company built software-defined satellites capable of carrying different sensors and executing multiple missions without hardware modifications – a platform approach that dramatically lowers the barrier to accessing space.
That philosophy has scaled with the company's ambitions. EnduroSat's flagship product today is a Gen3 ESPA-class satellite platform in the 200–500 kg range, delivering up to 3.5 kW of power and 2 Gbps of data transmission. Crucially, the Gen3 introduces a cableless design that allows each unit to be assembled and tested within hours.
The company's business model wraps this hardware into a complete service. Rather than simply selling satellites, EnduroSat manages the entire mission lifecycle – from design and manufacturing to launch and operations – under a fixed-cost constellations-as-a-service model. This approach gives customers a predictable path to orbit and, once in space, a platform for in-orbit data services and transactions from hundreds of sensors. Over 80 satellites and 3500 modules are now in orbit and more than 500 TB of data has been downlinked to date.
EnduroSat's founding story is rooted in education as much as entrepreneurship. Before launching the company, Raychev – who holds a Master's in Space Management from the International Space University and a PhD from Sofia University – returned to Bulgaria in 2010 with a conviction that the country needed homegrown space talent. He founded Space Challenges Academy, which has since become one of Europe's leading space education programmes, training over 600 alumni who have gone on to careers at leading space organisations worldwide.
In 2014, Raychev assembled a founding team and began developing prototypes. EnduroSat was formally established in January 2015. “Everyone who joined at first came from our own education programme,” Raychev has noted to the EIB. “At the time there was no other academic programme that could help prepare students in Bulgaria for a career in the space sector.” The company launched its first satellite – EnduroSat-1, a CubeSat deployed from the International Space Station – in 2018.
Today, EnduroSat employs over 300 professionals representing a broad range of expertise in satellite engineering, software, and mission operations. The leadership team includes Chief Technical Officer Viktor Danchev, alongside regional CEOs in Italy and France, reflecting the company's deliberately international character. Raychev himself was named Forbes Bulgaria CEO of the Year in 2024 and Man of the Year in Bulgaria in 2023 – recognition that has helped put the Bulgarian space ecosystem firmly on the European map.
The central challenge for EnduroSat has always been a familiar one for deep tech hardware companies: proving that what works in a laboratory can be reproduced at industrial speed and scale, at a price that genuinely competes. For satellites – which have traditionally been produced in ones and twos, by hand, over years – that required rethinking the manufacturing philosophy from first principles.
The company's progression through funding rounds tells the story of that scaling effort. A multi-million million round in early 2023 enabled EnduroSat to expand into the larger ESPA satellite class. In May 2025, a €43 million round led by Founders Fund funded the construction of a new 17,500 m² facility in Sofia and the build-out of US operations to serve commercial and defence customers.
Then, in October 2025, EnduroSat announced a further €89.9 million investment from Riot Ventures, Google Ventures, Lux Capital, the EIC Fund, and Shrug Capital – its second funding round of the year, and a strong signal of investor confidence in the company's trajectory. The announcement coincided with the opening of EnduroSat's new Space Center in Sofia: a facility equipped with advanced RF laboratories, ISO-classified clean rooms, and full space qualification capabilities, designed to produce up to two ESPA-class satellites per day.
Since joining the EIC Scaling Club, EnduroSat has raised a total of €143 million in disclosed funding – placing it, at the time of writing, among the top five most-funded companies across the entire Club's 120-member portfolio.
For a company of EnduroSat's ambition – building industrial-scale satellite manufacturing in Europe, while simultaneously expanding into the US market – the Club's network of investors, corporate partners, and policy stakeholders represents a natural fit.
But the EIC connection runs deeper than the Club itself. EnduroSat is also an EIC Accelerator beneficiary, with Raychev serving as an EIC Ambassador, and the EIC Fund participated directly in the October 2025 funding round. The company is additionally engaged in EU-funded R&D through the S4I2T project, exploring solar electric propulsion and autonomous refuelling concepts in support of a circular space economy.
The EIC Scaling Club is a curated community where 120 European deep tech scale-ups with the potential to build world-class businesses and solve major global challenges come together with investors, corporate innovators and other industry stakeholders to spur growth.
The top 120 European deep tech companies have been carefully selected from a pool of high-growth scale-ups that have benefitted from EIC financial schemes, other European and national innovation programmes, and beyond.
The EIC Scaling Club is an EIC-funded initiative run in partnership by Tech Tour, Bpifrance (EuroQuity), Hello Tomorrow, Tech.eu (Webrazzi), EurA and IESE Business School.
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