Senior Avionics – Electronics Engineer

Location: Sassenheim

As the Senior Avionics / Electronics Engineer at cosine you play a leading role in defining and realizing the electronic backbone of advanced optical payloads for space missions. You take ownership of avionics and electronics developments from early concept through integration and qualification, ensuring robust, scalable and mission-ready solutions. Beyond your technical expertise, you act as a trusted advisor within multidisciplinary teams, guiding architectural decisions, mentoring junior engineers and helping elevate engineering excellence across projects.

Your work directly contributes to Earth observation, environmental monitoring, defence-related remote sensing and planetary science missions that generate critical insights from orbit.

Tasks & responsibilities
In this role you will:

Define, own and evolve the avionics and electronics architecture of optical payloads, translating system requirements into robust electronic designs, interfaces and specifications

Lead technical decision-making throughout the development lifecycle, balancing performance, reliability, manufacturability, cost and schedule considerations

Act as the primary technical authority towards suppliers and subcontractors, driving technical alignment, design reviews, procurement strategies and make-or-buy decisions

Guide system-level integration, verification and qualification activities, resolving complex technical challenges and ensuring compliance with mission requirements

Coach and mentor junior engineers, provide technical leadership across projects and contribute to continuous improvement of engineering methods, standards and best practices

Your profile
We are looking for candidates with the following qualifications:

A Master’s degree in avionics, aerospace engineering, electronics engineering, electrical engineering or a related field

Extensive experience in avionics or electronics development for aerospace, space, defense or other high-reliability systems

Proven expertise in defining and reviewing complex electronic architectures, including power systems, data handling, control electronics and sensor interfaces

Experience leading technical discussions with customers, suppliers and multidisciplinary engineering teams throughout complete development programs

Strong experience with procurement, supplier management and industrialization of electronic subsystems and components

Demonstrated ability to provide technical leadership, mentor junior engineers and drive engineering excellence within project teams

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 working environment at the intersection of physics and engineering

The opportunity to deliver end-to-end solutions in autonomous project teams, in close collaboration with customers

27 days of annual leave (based on full-time employment)

Annual bonus based on personal and company performance

Hybrid working options, including the possibility to work partially from home

Company bicycle- and fitness plan

Initial one-year contract, with the aim of long-term collaboration

About cosine
Founded in 1998, cosine is a world-leading developer of space instrumentation and measurement systems, making the invisible measurable and the complex actionable.
Its expertise spans High-Energy Optics, including optics developed for ESA’s future New Athena X-ray observatory, as well as remote sensing solutions for Earth Observation and planetary science.
With over 25 years of experience and advanced cleanroom and assembly facilities across the Netherlands, Germany, and Italy, cosine brings deep scientific and engineering expertise to some of the most demanding missions in space and on Earth.
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.
cosine is committed to providing an inclusive and equal opportunities work environment where everyone can thrive. As a proud member of the Women in Aerospace community, we recognise the importance of diversity, inclusion, and equal opportunity in the workplace.