Thermal Systems Engineer

Company Details

In-Space Missions are world class experts who design, build and operate physical and digital space missions for global customers from our UK site.


Who are you?

This is an exciting role which will suit an enthusiastic, self-starting individual who is happy to work on a range of activities from technical studies to small spacecraft systems and subsystems. The role requires some knowledge and experience of designing, developing and building small spacecraft together with a willingness to learn and the ability to work with others to identify and resolve technical issues. Interest, knowledge and/ or experience of thermal analysis and design is essential. The right attitude is equally as important as background and experience.

You will be comfortable working as part of a team to deliver projects to a variety of customers including institutional, academic and commercial organisations. You will be comfortable working within a fast-paced environment and can present a professional face to clients, suppliers and partners.

You will be educated to at least degree -level or equivalent in a relevant scientific or engineering discipline and have experience in some of the following areas is required:

  • Systems Engineering on a small satellite program, preferably across the full project lifecycle;
  • Knowledge of Heat Transfer
  • Understanding of Spacecraft Thermal Control Subsystem and hardware
  • Technical delivery of complex systems, software and/or electronic hardware;
  • Spacecraft AIT and/or operations;
  • Delivery of space technology and/or space mission studies or R&D projects;
  • Technical pre-sales support during bid activity;
  • Working in and collaborating with multi-disciplinary teams;
  • Interfacing to external clients;
  • Reporting project progress to internal stakeholders;
  • Working with suppliers;
  • Following processes;
  • Knowledge of Space Standards (i.e. ECSS);
  • Knowledge of UK Space Industry.


  • Familiarity with Systema, Thermal Desktop, ThermXL, ESATAN, ESARAD, Sinda-G, or similar packages would be beneficial.
  • Proficient in use of appropriate technical modelling tools (for example MatLab; STK and/or others such as CAD software packages);
  • Proficient with MS Office Suite (Word, Excel, Powerpoint, Project);
  • Proficient in general programming, e.g. Python, Java, C/C++
  • Excellent communicator, both written and verbal;
  • Confident working in project delivery and bid teams.

What will you be doing here?

Working within the Thermal Systems team, you will be experienced in working on a range of activities from technical studies to small spacecraft systems and subsystems along with delivering projects to a variety of customers including institutional, academic and commercial organisations.

While the primary responsibilities of the role lie in project delivery, the role may require some bid support and other reasonable responsibilities as required by the business.

Responsibilities will include:

  • Co-ordinating and managing technical inputs to spacecraft design and development from internal and external parties including (but not limited to):
  • Payload providers;
  • Sub-contractors and suppliers (including launch providers);
  • Users;
  • Customers;
  • Regulatory authorities.
  • Definition of requirements from Mission and System Level and derivation of technical requirements to subsystem and equipment level (with support from senior team members and specialists);
  • Perform or contribute to the thermal design, analysis and testing of space systems, including thermal modelling and data analysis, conducting engineering trade-offs, and assessment of in-orbit data
  • Management and tracking of requirements through project delivery;
  • Derivation and management of system technical budgets and margins, with support from senior team members as required, including (but not limited to):
  • Mass budget;
  • Power budget;
  • RF link budget;
  • Thermal budget;
  • Delta-V budget.
  • Management of spacecraft interfaces;
  • Supporting the definition of spacecraft test and flight harnesses and MGSE/EGSE.
  • Management and execution of Validation and Verification activities at a subsystem and system level (including lab testing).
  • Collaboration with project managers to provide inputs to schedules; risk management plans; budget management; work package descriptions; and other project artefacts as required;
  • Technical pre-sales support to prospecting and bid activities;
  • Provision of technical inputs into technical consultancy activities such as customer supports, studies and R&D projects
  • Supporting spacecraft operations.

About In-Space Missions

In-Space Missions (ISM) are world class experts who design, build and operate space missions for global customers from our UK site. We also offer ‘Space as a Service’ by flying customer payloads on our spacecraft and by providing customers the ability to upload digital applications to operate on our hardware. ISM was founded in 2015 and has grown to comprise approximately 70 staff. The company was acquired by BAE Systems in 2021 but continues to operate as a separate business with our offices and satellite cleanrooms located in Alton, Hampshire in the UK.


We have a close-knit and supportive team, with diversity and inclusion being a key to our success. Although we are looking to rapidly expand our team, we are passionate about maintaining our small company ethos, something which is at the heart of our culture. We welcome varying backgrounds, skills, perspectives and life experiences. Here at In-Space Missions we are embracing Hybrid Working. Wherever possible, we offer flexible working arrangements to allow us to balance our work and personal life more effectively.

What can we offer you?

  • 30 days holiday a year plus bank holidays
  • Flexible Working
  • 10% Non-Contributory Pension
  • Private medical insurance and life insurance (provided by AXA)
  • Death in Service
  • Income Protection Scheme
  • Option to join BAE Share Incentive Plan
  • A fun work environment, full of opportunities for career growth
  • Team meetups, including team-building days and office parties!
  • Access to Rewards Plus- Benefits portal offering discounts to a host of retailers


Tagged as: engineering, aerospace, systems engineering, thermal

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