Senior Spacecraft Systems Engineer

About us

We are EnduroSat! A fast-growing space scale-up at the forefront of satellite innovation, specializing in advanced software-flexible satellites for commercial, governmental, and scientific endeavors.

• This is more than a job, it’s a mission
  We are making space universally accessible and redefining what’s possible
• We get things done
  We take ownership of what we do, and we work hard to make a difference
• We are fearless
  Transparency is our only way forward. We dare to address and resolve issues head-on
• We learn from our mistakes
  We deliver, take informed risks, and evolve to achieve our goals. We compare with the best version of ourselves

What is the role?

As a Senior Spacecraft Systems Engineer you will join our System Design team in Sofia. You will play a central role in the architecture, design, and development of our next-generation FRAME satellite platforms, working at the intersection of all spacecraft subsystems — power, communications, data handling, structures, and thermal.

As a senior member of the team, you will own system-level requirements and budgets, drive design trade-offs, and work hands-on with subsystem engineers, AIT teams, and external partners to take our spacecraft from concept through qualification to flight.

Some of your daily tasks will include:

• Define, decompose, and manage system requirements — from top-level mission and customer requirements down to subsystem and component specifications — ensuring full traceability throughout the spacecraft lifecycle
• Develop and maintain system architecture definitions, functional block diagrams, interface definitions, and operational concepts
• Own and iterate system-level budgets (mass, power, data, link) and drive design trade-offs across subsystems
• Support the design, development, integration, and verification of spacecraft subsystems (EPS, communications, on-board data handling, ADCS, structures)
• Work closely with AIT teams during assembly, integration, functional, and environmental test campaigns, and support the resolution of non-conformances
• Interface with suppliers, subcontractors, and customers on technical matters — reviewing deliverables, supporting design reviews, and ensuring requirement compliance
• Produce and review high-quality technical documentation: specifications, interface control documents, verification plans and reports, and design review data packages
• Mentor junior engineers and contribute to the continuous improvement of our systems engineering processes and tools

What do we look for?

• Demonstrated experience in the design, development, and delivery of spacecraft systems (power, communications, data handling, etc.)
• Degree in aerospace engineering, electronics, computer science, or a similar technical field
• Experience with defining, tracking, and flowing down requirements from top-level requirements to component requirements
• Ability to communicate through and understand graphical representations — schematics, sequence diagrams, state diagrams
• Strong analytical mindset, attention to detail, and the ability to work across disciplines in a fast-paced environment
• Excellent written and spoken English

How to Stand Out:

• Proficiency in using engineering software and tools for satellite design and analysis, e.g. SolidWorks
• Experience analysing different system budgets such as power, link, and delta-V
• Experience with orbit simulation tools, e.g. STK, GMAT
• Experience with DFMEA
• Basic working knowledge of C/C++ or Python
• Knowledge of UML/SysML
• Project and risk management skills
• Experience with Atlassian tools (Jira/Confluence)
• Familiarity with ECSS standards and formal verification/validation processes

Why EnduroSat?

• Fast-paced and delivery-focused culture
  We work with well-defined quarterly-based objectives that allow us to fast-track the progression of our work and improve as we go
• Tough engineering challenges and hard-core R&D
  You will work on unique space technology and build next-gen innovations, mentored by world-recognized space experts
• Constant learning and progression
  Own your personal growth through our career progression framework and educational programs
• Chance to join our space educational program
  Meet international space experts and improve your knowledge and skillset through our hands-on educational program

At EnduroSat, we embrace diversity and strive to create an inclusive environment where everyone is treated with fairness and respect. We are committed to equal employment opportunities without discrimination against any employee or job applicant on the basis of race, colour, religion, sex, national origin, age, disability, sexual orientation, or gender identity. This position is open to people with disabilities in accordance with the Bulgarian Persons with Disabilities Act, ensuring accessibility and reasonable accommodation in the workplace.