Medior System Engineer

TNO; Den Haag; Hybrid; EUR 54,000 - 71,000; Full time

Benefits offered by this job

Flexible working hours

Work from home

Relocation package

Pension scheme

Career development opportunities

Job summary

TNO is seeking a Software Engineer to translate research into robust C++ software for naval ships, supporting modernization of the Dutch naval fleet and close collaboration with Navy software engineers.

You will work in a motivated team with strict quality standards, extensive testing, and a focus on deployable sonar solutions in real-world environments. The role offers flexible hours and opportunities for career growth within a renowned defense tech organization.

Qualifications

• Master's degree in Computer Science, Applied Mathematics, Physics, or a related field.
• Experience with C++ software development.
• Experience with configuration management.
• Affinity with software testing and quality assurance.
• Excellent command of Dutch and English (C1) spoken and written.

Responsibilities

• Developing and enhancing C++ software for naval defense frigates.
• Collaborating with researchers and Navy engineers.
• Ensuring software is maintainable, reliable, and well documented.
• Participating in software testing and validation activities.
• Contributing to deployment of innovative sonar solutions in operational environments.

Skills

C++ development

Configuration management

Software testing & QA

Communication & structured working

Education

Master's degree in Computer Science

Master's degree in Applied Mathematics

Master's degree in Physics

Job description

About this positionTNO is a leading research and technology organization focused on innovation in defense and security. Our Acoustics and Underwater Warfare department develops advanced sonar and software solutions to strengthen the capabilities of the Royal Netherlands Navy.In today's unpredictable geopolitical environment, your work is crucial to protecting society. By developing reliable and advanced software, you directly contribute to national security and the success of defense operations. This is meaningful work that delivers solutions to real-world challenges.Would you like to contribute to the development of new sonar applications for the latest naval vessels and help protect our fleet against underwater threats such as torpedoes and drones? Then this Software Engineer role may be the perfect opportunity for you.

What will be your role?

As a Software Engineer, you will work in a motivated team developing sonar applications used aboard naval ships. You will translate research results into robust C++ software, support the modernization of the Dutch naval fleet, and collaborate closely with Navy software engineers. Strict quality standards and extensive testing are essential aspects of the role.

Your responsibilities include:

• Developing and enhancing C++ software for naval defense frigates.
• Collaborating with researchers and Navy engineers.
• Ensuring software is maintainable, reliable, and well documented.
• Participating in software testing and validation activities.
• Contributing to the deployment of innovative sonar solutions in operational environments.

What we expect from youRequired Qualifications

• A Master's degree in Computer Science, Applied Mathematics, Physics, or a related field.
• Experience with C++ software development.
• Experience with configuration management.
• Affinity with software testing and quality assurance.
• Strong communication skills and a structured way of working.
• Excellent commandment of both Dutch and English language verbally and in writing (minimum C1 level).

Preferred QualificationsKnowledge

• Knowledge of signal processing.
• Experience working with complex technical systems.
• Interest in defense, maritime technology, or high-tech software development.

What you'll get in return

Challenging and varied work with a real impact. And plenty of opportunities as, at TNO, you are in charge of shaping your career. We offer a gross monthly salary (based on your knowledge and experience), 8% holiday pay, a 13th month bonus of 8.33% and a flex budget (5.58% + € 180). In addition, you will be given every opportunity to develop yourself.TNO offers optional employee benefits, enabling you to tailor your benefits package to match your personal situation.

You may also expect:

• An extremely professional, innovative working environment where colleagues are leading experts in their field.
• The opportunity to attend courses, workshops and conferences, and to receive training and coaching based on your needs.
• 33 days annual leave plus a flexible holiday that can be used on a cultural, religious, or otherwise important day of your choosing (on a full-time basis).
• An employer working towards a respectful, inclusive, and equitable work environment where every employee can flourish, with various initiatives such as Jong TNO, numerous expertise based guilds, Rainbow Community and Round Tables on diverse inclusion topics.
• We offer a comprehensive and flexible mobility plan that also includes full compensation for public transportation for commuting and business travel.
• Great social events with your team and other TNO colleagues. That’s how you will get to know a lot of people really quickly.
• Flexible working hours, the possibility to work parttime (32 or 36 hours) and the possibility of working from home.
• Extensive relocation package for international candidates.
• A good pension scheme.
• Read more about tailoring your benefits package.

TNO as an employer

Our people are at the heart of TNO. Their curiosity, expertise and entrepreneurial mindset make it possible to deliver high-impact research and innovations that contribute to society’s sustainable wellbeing and prosperity. That is why we invest in an inspiring and inclusive working environment where colleagues can excel, have autonomy and continue to grow. Your talent and ambition have every opportunity to flourish at TNO. You work with experts (both within and beyond TNO), have access to advanced technology and the freedom to explore, experiment and innovate. Our strength lies in independence, reliability and collaboration. We find each other in wonder and ingenuity. We are driven to push boundaries. By working with businesses and government, and by connecting different perspectives, we strengthen our innovative capability and create responsible, meaningful results. At TNO, we believe this is our time to help society, government and business move forward faster. Together with driven colleagues, you turn knowledge into concrete innovations or ventures that truly make a difference by combining the power of science and entrepreneurship. And in doing so, you make your mark on our time.

The selection process

Please apply before the 8th of September 2026. The selection process comprises two interview rounds. In a final meeting we will discuss the terms of employment and your tailored benefits package. We aim to finalize the entire process within four weeks.

The selection process may include an online assessment and a reference check.

As you will be working for clients in the domain of defence and security, a Certificate of Conduct (VOG) is required before starting a new job at TNO.

As you will be working for clients in the domain of defence and security, a Certificate of No Objection issued by AIVD (the Dutch General Intelligence and Security Service) is mandatory. This means you will have to undergo a security screening. Read more about security screening.