Stellar Odessos: Based in the EU
We have your back from idea to flight
We have your back from idea to flight
We have been helping our customers to execute ambitious space projects within their budget and timeline.
Energy Management
The power supply and management on your spacecraft is safely handled by our team.
We ensure superior mass efficiency and proven reliability.
We Are Hiring
We always need creative & versatile engineers for our office in Varna, Bulgaria
Feel free to send your CV to office@stellarodessos.space
About Stellar Odessos
Stellar Odessos is a Bulgarian engineering company committed to advancing the future of space technology. Founded by a team passionate about innovation and high-performance solutions, we specialize in the development and manufacturing of advanced battery strings for space and high-reliability applications.
Our mission is to contribute to the growing space ecosystem in Europe by delivering dependable, efficient, and customizable power solutions for satellite platforms and propulsion systems. Located in Varna, Bulgaria, Stellar Odessos combines local expertise with international collaboration, positioning itself as a trusted partner for next-generation space missions.
Cell Technology Trade-Offs
At Stellar Odessos, we work with a wide range of lithium-based cell chemistries to match mission-specific requirements. Each cell type offers distinct advantages and trade-offs:
High Energy Density Cells (e.g., NMC, NCA)
Ideal for missions with strict mass and volume limits. These cells offer excellent Wh/kg performance but require careful thermal and safety management.
High Power Cells (e.g., LCO, LFP)
Suitable for systems with short bursts of high current demand. They provide robust thermal stability and long cycle life but come at the cost of lower energy density.
Radiation-Tolerant Cells
Specialized solutions designed for high-radiation orbits. While typically heavier and more expensive, they ensure long-term operability in harsh environments.
Commercial Off-the-Shelf (COTS) Cells
Common in NewSpace platforms where cost and availability are critical. These offer a good balance of performance and price, but require additional qualification for space use.
We support our customers in selecting the optimal cell type based on mission duration, power profile, thermal conditions, and budget constraints.
Rapid custom delivery for various solutions
Energy Management
Microsatellite Battery with High Power Capability: Affordable Solution with Proven Reliability
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This combination of performance and reliability at affordable price is achieved by deliberate adoption of selected industrial state-of-the-art power technologies (to support specific missions requirements) AND rigorous qualification test program
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Reliable satellite power systems require robust fault detection and reset/recovery architecture, assuring satellite survival even in presence of multiple faults and unexpected contingencies. This implementation must be validated through extensive testing
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COTS li-ion cells provide high peak power capability (~500 W/kg), suitable for mission like SAR
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Multi-year mission lifetime can be achieved with careful control of cells charge and discharge. Integrated hardware provide control of charging, discharging, cell balancing and power distribution
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Over 20 units launched (more delivered, now in the system integration pipeline)
Hiring
Looking for creative passionate engineers for our development lab in Varna, Bulgaria.
Junior Space Engineer(s)
Engineers of various specialties are wanted for an EU branch of a small U.S. aerospace company which is being established in Varna, Bulgaria.
We are looking for enthusiastic creative people with these engineering skills:
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electronics
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mechanical
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RF engineering
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embedded
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3D design and printing
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... or any other art which can help our hardware go to space.
The best candidates will be versatile — With deep excellence at their speciality but also flexible with broad interdisciplinary understanding of multiple technologies. After all, every satellite is inherently a complex assembly of electronics, mechanisms, software operating in challenging physical environment. It is also essential that candidates are comfortable moving between conceptual design, detailed engineering, hardware fabrication and system testing of actual spacefaring components ("český kutil” is the perfect model). In our view, diversity of engineering experience is essential to develop capable and well-rounded engineering talent.
The job: Y ou may work remotely with the US team or locally on EU projects. You should expect to be able to travel on business and occasionally spend a few weeks with the US team in California.
The process:
After initial shortlisting you will go through several interviews (mostly video) including a psychological evaluation which will assess your abilities and your match with current project needs.
Remote work is a realistic option.