Digital Twin Developer

About Swiftstrike Swiftstrike is a Swedish defence-technology company. We build hardware and the AI software that runs it, from edge to command. Our products are developed with experienced operators and refined through real-world field testing, and everything we build is designed to be cost-effective at scale and priced for fielding in numbers. The role Before our systems reach the field, they run in simulation. Our digital twin is where we develop, test, and prove autonomy and perception software against scenarios that are impractical, expensive, or unsafe to reproduce live. As our Digital Twin Developer, you will build and own that environment: high-fidelity, real-time simulation of our systems and the world they operate in, built in Unity. Your work is what lets the rest of the company move quickly and safely. The same software stack runs in the twin and in the field, so the realism you build translates directly into confidence in what we deploy. What you'll do

• Build and own our digital-twin and simulation environment in Unity.
• Model our systems, their sensors, and the environments they operate in, with the fidelity needed for real decisions.
• Integrate the simulation with the real software stack, so the same code runs in the twin and in the field.
• Build scenario tooling that lets engineers create, replay, and vary situations at scale.
• Optimise for real-time performance and physical accuracy, and know when to trade one for the other.
• Work with autonomy, perception, and test engineers to make the twin the place our software is proven.

What we're looking for

• Extensive experience building real-time 3D applications in Unity.
• Strong C# skills, and a solid grasp of 3D maths, physics, and rendering.
• Experience with simulation, digital twins, or game engines used for non-game purposes.
• Comfort integrating a game engine with external software, data feeds, and hardware.
• A pragmatic sense of fidelity: enough realism to trust the result, no more than needed.
• Professional fluency in English.

Nice to have

• Sensor simulation, such as electro-optical, RF, radar, or lidar, or physically based sensor modelling.
• Experience with robotics or autonomy simulation frameworks.
• Experience with HDRP or URP, custom shaders, or GPU work.
• Familiarity with machine-learning workflows that consume simulated data.
• A background from the armed forces or from defence.
• Swedish language skills.

What we offer

• The environment you build is where our software earns trust before it reaches the field.
• Ownership of an entire discipline. You define how a defence-technology company simulates, from day one.
• Unusually direct impact: the same stack runs in your twin and in real systems.
• An office in Stockholm, plus time in the field with the systems you model.
• Competitive compensation, including equity options, so you share in what we build.

Given the nature of our work, employment may be subject to a security review and to citizenship or residency requirements applicable to Swedish defence industry. We will discuss this openly during the process.