Office Assistant (20 h/week)

About the position
Your (space) mission

As the Office Assistant at cosine you are the backbone of our Berlin office and the go-to person who keeps everything running smoothly on a daily basis. You play a key role in enabling a small, fast-moving team to focus on developing cutting-edge optical technology for space applications.

 You work in a unique environment: a close-knit team with a startup mentality, backed by the stability and expertise of cosine. Your presence in the office is essential. You create structure, keep things organized, and ensure a professional and welcoming workspace where colleagues and visitors feel at ease.
From managing daily operations to supporting the team and coordinating with our headquarters in the Netherlands, your work has a direct and visible impact on how effectively the team performs.

Tasks & responsibilities

In this role you will:

• Manage daily office operations and maintain an organized, efficient Workspace
• Act as the main point of contact for office-related matters, suppliers, service providers and the headquarters in the Netherlands
• Support administrative processes such as ordering, invoicing and basic financial tracking
• Coordinate logistics for meetings, visitors and team activities
• Maintain office supplies, facilities and an overall positive workplace experience

Your profile

We are looking for candidates with the following qualifications:

•     Completed commercial training (e.g. office, hotel, administration) or equivalent
•     Previous experience in an Office Assistant, Office Manager or similar administrative role
•     Strong organizational skills and attention to detail
•     A proactive and hands-on mindset; you take ownership and get things done
•     Comfortable working in a small, dynamic and fully on-site team environment
•     A warm, service-oriented and welcoming personality; you enjoy creating a positive and friendly office atmosphere
•     Excellent command of English and German, both written and spoken
•     Available 20 hours per week to work on-site in our Berlin office

What we offer

At cosine, we highly value our employees, and we will support your professional and personal development. We also provide our employees with:

•     A unique, international and modern working environment in a high-technology industry sector
•     growing, dynamic and young team in Berlin
•     €1,500 – €1,600 gross per month based on 20-hour work week
•     Flexible and family-friendly working hours
•     Berlin public transport compensation of €39/month
•     Lunch benefits and €20 gift card (Sachbezug20)
•     The position is initially for a fixed term of one year, with a clear prospect of extension

About cosine

cosine transforms high-stake measurement challenges into scalable, real-world solutions.

What sets cosine apart is its integrated approach, linking insight, science, and engineering to deliver solutions that work in the real world, enable science and make an impact for humanity. Backed by over 25 years of heritage expertise and deep systems thinking, cosine guides partners from defining the real need to deploying reliable, precision-built technologies that enable progress across space and planet.

What makes cosine a unique place to work is that your work goes end-to-end—from concept and design to building, testing, and delivering hardware that actually flies in space. You work in small, highly skilled teams where you have real ownership and impact, alongside experts in optics, physics, nanofabrication, and systems engineering.

Apply now