Senior Engineer, Backend (m/f/d)

About The Role

As a Senior Backend Engineer on our Internal Platform team, you will architect the backbone of our engineering efficiency. You’ll build the critical backend services, APIs, and automations that empower our Cloud, IT, and product teams to move faster and innovate securely. Your mission is to solve platform-level challenges with pragmatic code, transforming manual processes into seamless, self-service workflows.

Working in close partnership with our Site Reliability Engineering (SRE) team, you will ensure every solution you create is robust, observable, and built for scale from day one. What You’ll Build Essential internal tools, APIs, and backend services that streamline our core Cloud & IT workflows. Automated systems for access management, resource provisioning, service requests, and operational reporting.

Robust integrations connecting our identity provider, secrets management, CI/CD pipelines, and other key infrastructure. Self-service capabilities that make it easy for teams to consume central platform services like monitoring, PKI, and hosting automation. Clear interfaces and documentation that enable product teams to integrate with central services while maintaining clear ownership.

Maintainable, well-tested backend code complete with documentation, logging, and operational runbooks. A strong, collaborative partnership with the SRE team to ensure all internal applications are observable, supportable, and resilient. Pragmatic automations that eliminate recurring manual work and reduce operational friction.

What You Bring Strong backend engineering experience with a portfolio of production services, APIs, and automations. js. Solid experience with REST APIs, service integrations, databases, and authentication/authorization patterns.

Comfort working with infrastructure-adjacent systems like CI/CD, IAM, cloud APIs, and monitoring tools. A good understanding of operational best practices, including logging, monitoring, deployment, and testing.

Requirements

and navigate complex dependencies in a collaborative environment. Clear and concise written communication skills, especially for technical documentation and API specifications. Experience with internal developer platforms, workflow engines, or IT automation is a strong plus.

Please note: You do not need to meet every single requirement to apply. We welcome motivated candidates who are eager to grow into the role and develop their expertise further.

What We Offer

Join a mission-driven European defense tech company at a pivotal stage of growth, where you can help shape meaningful technology, take ownership early, and grow with the business!

Compensation

package including a bonus opportunity 27 vacation days to start, increasing with tenure up to 30 days Employer-supported pension contribution Learning & development support and team events budget Employee discounts and flexible

Benefits

budget via Probonio Hybrid working setup depending on role and team needs Structured salary bands, levelling framework, and bi-annual development conversations Referral bonus program, dog-friendly office, and relocation support where applicable About Us ARX is a dual-use technology company that specializes in developing autonomous unmanned systems and sensors for the European defence sector. Our dual-use unmanned ground systems and sensors assist NATO Armies and civilian first responders in tackling their most challenging problems by providing them with training and information to make better decisions and take effective actions in life-or-death situations. As our team continues to expand rapidly, we are seeking motivated candidates who are excited to work in a highly energetic, creative, and innovative team dedicated to developing autonomous systems for challenging environments.