The European Space Agency (ESA) is offering an internship in the Ground Systems Engineering and Innovation Department, Optical Technologies Section, at ESOC in Darmstadt, Germany. Applications close on 30 November 2026 at 23:59 CET/CEST, and university students from ESA's participating states can choose between two optics topics: satellite laser ranging and on-sky optical performance characterisation. At Youth Works Hub, we reviewed the full vacancy and set out every topic, task and requirement below.
The Internship at a Glance
The internship sits in ESA's Operations Directorate. These are the formal details of the vacancy:
🆔 Job Requisition ID: 21149
🎓 Type of appointment: Intern
🏛️ Directorate: Operations
🏢 Department: Ground Systems Engineering and Innovation Department, Optical Technologies Section
📍 Workplace: Darmstadt, DE
🗺️ Location: ESOC, Darmstadt, Germany
📣 Publication method: External Only
📅 Closing date: 30 November 2026, 23:59 CET/CEST
Where You Will Be Based: ESOC, Darmstadt
The internship is located at ESOC in Darmstadt, Germany. The vacancy lists Darmstadt, DE as the workplace for the role within the Operations Directorate.
Our Team and Mission: Ground Systems Engineering and Innovation
The Ground Systems Engineering and Innovation Department is responsible for all the ground systems engineering and support activities required to support mission operations and implement innovation.
The Department maintains and manages a full level of competences, technologies and services in all engineering disciplines related to ground systems, infrastructure, technology evolution and Engineering R&T and innovation.
The Department provides expert support in these areas to the Directorate of Operations for all current and potential missions and leads, in the role of architect, ground systems evolution and innovation implementation in the infrastructure. It is furthermore responsible for the overall technical standardisation coordination for the ground segment, in particular in the Management Council of the Consultative Committee for Space Data Systems (CCSDS).
Five Domains of Expertise
The Department relies on the following domains of expertise:
📡 Ground Station Engineering
🚀 Flight Dynamics and Mission Analysis
💽 Mission Operations Data Systems Engineering
🧭 Navigation Support
🏗️ Multi-Mission Infrastructure: Ground Segment Integration and Testing
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How Long the Internship Lasts and When It Starts
According to ESA's announcement of its 2027 student internships, an internship lasts between 3 and 6 months and starts from February 2027. The exact start date is agreed with the ESA tutor.
Two Topics to Choose From
The vacancy lets you choose between two topics in the field of activity for the internship:
1️⃣ Topic 1: Measuring Space with Light: Satellite Retroreflector Arrays In-Orbit Validation Using Laser Ranging
2️⃣ Topic 2: Optical Systems Performance Characterisation Using Astronomical Observations
Topic 1: Measuring Space with Light
Satellite Laser Ranging (SLR) is one of the most accurate space measurement techniques available today. It enables millimetre-level orbit determination and supports a wide range of scientific and operational applications, such as precise orbit determination (POD), geodesy, Earth observation missions, navigation systems and space debris tracking.
Within this context, ESA offers an internship opportunity for students interested in optics, space systems, data analysis and laser technologies to contribute to the in-orbit validation of spacecraft Retroreflector Arrays (RRAs). Using real mission data acquired from operational SLR stations, you will help analyse laser returns, assess optical performance in orbit, and develop innovative methods to characterise the behaviour of retroreflector arrays under real operational conditions.
Topic 1: What You Will Work On
You will contribute to the development and application of advanced techniques for the in-orbit validation of spacecraft Retroreflector Arrays through Satellite Laser Ranging observations. Activities may include:
🎯 designing and supporting laser ranging observation campaigns for satellites equipped with RRAs
📐 modelling retroreflector array performance, including signal return characteristics, pulse spreading and observation geometry effects
📊 analysing high-precision laser ranging measurements to assess RRA performance and ranging accuracy in orbit
⚖️ comparing in-orbit observations with numerical predictions to validate optical models and mission assumptions
🌡️ investigating performance trends and anomalies caused by spacecraft attitude, thermal conditions or operational constraints
🧩 developing data-analysis pipeline and visualisation tools to support the interpretation of SLR measurements
📝 contributing to technical reports and engineering assessments supporting current and future ESA missions
Topic 1: What You Will Gain Experience With
The topic gives you hands-on exposure to the following areas:
🔦 Satellite Laser Ranging systems and optical ground stations
⏱️ precision optical measurements and timing systems
🧮 numerical modelling and simulation of optical payloads
🌐 spacecraft orbit and attitude geometry
📉 scientific data analysis and visualisation tools
🛸 real mission data from satellites operating in orbit
This internship offers an opportunity to gain experience at the intersection of spacecraft engineering, optics, laser systems and data analytics, contributing to the validation of technologies that enable millimetre-level satellite positioning and support scientific and operational space missions.
Topic 1: Skills and Interests ESA Looks For
For Topic 1, the vacancy lists the following requirements:
💡 a strong interest in space and ground-based systems, optics, laser technologies, and satellite applications
🔬 basic knowledge of optics, photonics, astrodynamics, spacecraft engineering, or scientific instrumentation
🐍 experience with scientific programming and data analysis (e.g. Python, MATLAB, or similar tools)
📶 familiarity with numerical modelling, signal processing, or statistical analysis would be considered an asset
🧠 good analytical, problem-solving, and communication skills
🤝 the ability to work both independently and as part of an international multidisciplinary team
🧰 prior experience with astronomical instrumentation, satellite tracking, optical measurements, or space mission analysis is beneficial but not required
✨ curiosity, enthusiasm for learning, and a passion for applying engineering and scientific methods to real mission challenges are highly valued
Topic 2: Characterising Optical Systems from the Sky
Laboratory measurements and design analyses provide the reference expectations of the performance of an optical system. However, the operational verification of an optical system requires the ability to assess its image quality and its system-level performance using observational data acquired under real operating conditions. Stellar observations provide a powerful means to evaluate the end-to-end performance behaviour of a telescope, enabling the characterisation of optical, geometric, photometric, tracking and dynamic performance directly from observational data.
The main objective of the internship is to develop a methodology and establish a comprehensive framework for the characterisation of optical systems from on-sky observations under real operational conditions, and to identify measurable indicators that describe the overall performance of the instrument.
Topic 2: Performance Aspects the Activities Cover
The activities will address topics such as:
🖼️ field-dependent image quality characterisation
🪟 optical distortion and geometric calibration
💠 throughput, vignetting, and photometric uniformity
🧲 tracking accuracy and dynamic effects
🌊 wavefront behaviour and wavefront error estimation
🔀 field-dependent aberration characterisation
🎚️ focus and optical alignment assessment
🔁 stability and repeatability of performance over time
🆚 comparison between measured performance and optical design predictions
🏷️ definition of performance indicators suitable for operational performance assessment
Topic 2: How You Will Contribute
You will contribute to the following work:
🗃️ analysis of observational datasets acquired under representative operational conditions
🤖 development of methods and automated processing workflows for optical performance assessment
🔎 extraction and visualisation of image quality, geometric, photometric, and stability metrics
🪞 investigation of methodologies to characterise optical performance across the field of view
📈 generation of performance maps, statistical summaries, and trend analyses
🌤️ assessment of the impact of operational and environmental conditions on system behaviour
🧪 comparison of observational results with optical models and expected performance
🏁 consolidation of characterisation results into a coherent set of performance indicators and assessment products
📄 preparation of technical documentation and presentation of results
🛠️ verification and refinement of the optical model and optical prescription through comparison between measured performance and theoretical predictions
This internship offers practical experience at the intersection of optical engineering, astronomical instrumentation, scientific computing, and performance verification, contributing to the assessment and validation of advanced telescope systems in an operational environment.
Topic 2: Degrees and Experience ESA Is Looking For
Applicants for Topic 2 should be pursuing a degree in:
🔆 optical engineering
⚛️ physics
🌌 astronomy or astrophysics
✈️ aerospace engineering
➗ applied mathematics
💻 computer science
🎓 or a related scientific or engineering discipline
Experience in one or more of the following areas would be advantageous:
📷 optics and imaging systems
🖥️ scientific programming (Python)
🎞️ image processing and data analysis
🌠 astronomical instrumentation
📋 statistical analysis and data visualisation
Education Requirement
You must be a university student, preferably in your final or second-to-last year of university course at Master's level. In addition, you must be able to prove that you will be enrolled at your university for the entire duration of the internship.
Language Requirements
The working languages of the Agency are English and French. A good knowledge of one of these is required. Knowledge of another ESA Member State language is an asset.
Behavioural Competencies
The vacancy lists six ESA core behavioural competencies. For more information, the vacancy refers applicants to the ESA Core Behavioural Competencies guidebook:
🏆 Result Orientation
⚡ Operational Efficiency
👥 Fostering Cooperation
💬 Relationship Management
🔄 Continuous Improvement
🔮 Forward Thinking
Which Nationalities Can Apply
Applications are only considered from nationals of one of the following States: Austria, Belgium, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, and the United Kingdom.
🍁 Cooperating State: applicants from Canada can apply as well
🇪🇺 European Cooperating States (ECS): applicants from Bulgaria, Croatia and Malta can apply as well
Selection Process
During the interview, your motivation for applying to this role will be explored. During the recruitment process, the Agency may also request applicants to undergo selection tests.
Application Limit
According to ESA's announcement of its 2027 student internships, one candidate can apply for a maximum of 2 vacancies.
Diversity, Equity and Inclusiveness
ESA is an equal opportunity employer, committed to achieving diversity within the workforce and creating an inclusive working environment. It welcomes applications from all qualified candidates irrespective of gender, sexual orientation, ethnicity, religious beliefs, age, disability or other characteristics.
At the Agency, diversity is valued and people with disabilities are welcome. Whenever possible, ESA seeks to accommodate individuals with disabilities by providing the necessary support at the workplace. The Human Resources Department can also provide assistance during the recruitment process, and you can contact ESA by email using the address in the Links section below.
Important Information
The information published on ESA's careers website regarding internship conditions is correct at the time of publication. It is not intended to be exhaustive and may not address all questions you would have. You can find more opportunities like this in the internships and traineeships section of Youth Works Hub.
Frequently Asked Questions
Where is the ESA Optical Technologies Section internship based?
The internship is based at ESOC in Darmstadt, Germany, within ESA's Operations Directorate. The vacancy lists Darmstadt, DE as the workplace.
What is the deadline to apply?
The closing date is 30 November 2026 at 23:59 CET/CEST. Applications are submitted through the ESA careers website.
Which topics can I choose from?
You can choose between two topics. Topic 1 is Measuring Space with Light, the in-orbit validation of satellite Retroreflector Arrays using Satellite Laser Ranging. Topic 2 is Optical Systems Performance Characterisation Using Astronomical Observations.
Who can apply for this internship?
You must be a university student, preferably in your final or second-to-last year of university course at Master's level. You must also be able to prove that you will be enrolled at your university for the entire duration of the internship.
Which nationalities are eligible?
Applications are only considered from nationals of ESA's listed States, which include Germany, France, Italy, Spain, the United Kingdom and 22 others named in the vacancy. Applicants from Canada as a Cooperating State, and from Bulgaria, Croatia and Malta as European Cooperating States, can apply as well.
How long does the internship last and when does it start?
According to ESA's 2027 student internships announcement, an internship lasts between 3 and 6 months and starts from February 2027. The exact start date is agreed with the ESA tutor.
Which languages do I need?
The working languages of the Agency are English and French, and a good knowledge of one of them is required. Knowledge of another ESA Member State language is an asset.
How many ESA internship vacancies can I apply for?
One candidate can apply for a maximum of 2 vacancies, according to ESA's announcement of its 2027 student internships.
Do I need programming experience?
For Topic 1, the vacancy asks for experience with scientific programming and data analysis, for example in Python, MATLAB or similar tools. For Topic 2, scientific programming in Python is listed as advantageous experience.
What happens during the selection process?
Your motivation for applying to the role will be explored during the interview. ESA may also ask applicants to undergo selection tests.
Deadline
⏳ 30 November 2026
Links
🔗 Full vacancy and application (Apply now): https://jobs.esa.int/job/Darmstadt-Intern-in-the-Ground-Systems-Engineering-&-Innovation-Department-Optical-Technologies-Section/1452810733/
📘 ESA Student Internships 2027 announcement: https://www.esa.int/About_Us/Careers_at_ESA/ESA_Student_Internships_2027_are_now_open
🌐 ESA website: https://www.esa.int
📧 ESA student internships contact (diversity and accessibility questions): ESA.Student.Internships@esa.int
