Founding Engineer

YES!Delft Students; Netherlands; Hybrid; EUR 56,000 - 89,000; Full time

Benefits offered by this job

Direct influence on product

Autonomy

Budget for dev tools

Hybrid work in Den Bosch

Competitive salary

Job summary

Offensys is seeking a strong full-stack engineer to help shape the platform from day one. You’ll work directly with the founders on development, architecture, and the roadmap, delivering real customer value rather than merely implementing features.

Within a year, you’ll own critical components, collaborating across teams while maintaining autonomy and leveraging AI-assisted tools. The role offers hybrid work with two days weekly at the Den Bosch office.

Qualifications

• Strong full-stack engineer with modern practices.
• Experience with Azure, Kubernetes and Flux is valuable.

Responsibilities

• Build new platform capabilities from concept to production, always with customer value in mind.
• Contribute to architectural decisions and scalability while avoiding unnecessary complexity and over-engineering.
• Prioritize work based on customer feedback, product insights, and business impact rather than technical novelty.
• Improve deployment processes, reliability, and maintainability so we can continue moving fast.
• Take ownership beyond writing code and act as a trusted sparring partner for the founders on product direction and roadmap decisions.

Skills

Full-stack engineering

AI-assisted development

Curiosity

Adaptability

Tools

Go

Python

TypeScript

Azure

Kubernetes

Flux

Job description

Help define the standard in offensive security. Work directly with founders on the development, architecture, and roadmap of our platform.

At Offensys, we're building the platform that enables enterprise security teams to continuously validate their own defenses. We simulate real-world attacker tradecraft, so organizations don't have to guess whether or not they are secure. With Offensys, they know.

Our mission is simple: to enable our clients to stay ahead of the threat.

We're early. We're moving fast. And we're building what we believe will become a new standard in offensive security. We're looking for people who don't want to watch from the sidelines or be told what to do, but want to proactively help define that standard.

The role

You'll work directly with the founders on the development, architecture, and roadmap of our platform. Not to build features because they're technically interesting, but because they create real value for our customers.

You think in outcomes. You validate ideas before scaling them. You have strong opinions about what is, and what isn't worth building.

Within a year, you'll own some of the most critical components of our platform.

What you'll do

• Build new platform capabilities from concept to production, always with customer value in mind.
• Contribute to architectural decisions and scalability while avoiding unnecessary complexity and over-engineering.
• Prioritize work based on customer feedback, product insights, and business impact rather than technical novelty.
• Improve deployment processes, reliability, and maintainability so we can continue moving fast.
• Take ownership beyond writing code and act as a trusted sparring partner for the founders on product direction and roadmap decisions.

Who we're looking for

We're looking for a strong full-stack engineer. Someone who thinks just as deeply about why something should be built as how it should be built.

You're comfortable with modern engineering practices and continuously invest in your own growth, including the effective use of AI-assisted development tools.

Our current stack includes Go, Python, and TypeScript. Our infrastructure runs on Azure, Kubernetes, and Flux. Experience with these technologies is valuable, but we're looking for curiosity, adaptability, and the drive to learn rather than someone who simply checks every box.

Experience or affinity with cybersecurity is a plus, but not a requirement. Curiosity about the domain is.

Open-source contributions, side projects, blog posts, conference talks, or publicly visible work tell us more than a CV full of buzzwords.

What we offer

• Direct influence on product, architecture, and roadmap.
• Close collaboration with the founders from day one.
• A high degree of autonomy.
• The freedom to experiment, validate ideas, and course-correct quickly.
• Access to and budget for modern development tools, including the latest and greatest AI-assisted coding tools.
• A competitive salary between €5,000 and €8,000 gross per month, depending on experience and profile.
• Hybrid working, with at least two days per week at our office in Den Bosch (near the central station)

You'll be one of the first engineering hires at Offensys. That means you'll help shape not only the product, but also the engineering culture, technical standards, and ways of working that will define the company as it grows. If you're excited about building a category-defining security product and want to have an impact on its future, we'd love to hear from you.