Numerical Code Developer

At Hypersonica, we’re redefining what’s possible in European defence technology. We exist to deliver speed, resilience, and technological independence at a pace that sets a new standard. We are a small, elite team working on problems that matter, and solving them fast. By joining Hypersonica, you’re not stepping into a predefined role. You’re joining a talent dense environment where every individual shapes the direction of the company. Our philosophy is to hire a small number of exceptional people with broad, deep technical capability, strong judgement, and the ability to operate autonomously. We hire for talent, not rigid boxes. This role represents a business need, but the way it evolves will be shaped by the individual. If you’ve achieved what others said was impossible, or you bring a unique combination of skills that doesn’t fit a traditional mould, we want to hear from you. The work you do here directly contributes to Europe’s technological independence.

What you’ll do

• Own the development of core components of our in-house simulation framework for aerodynamic, aerothermal, and aerostructural modelling of hypersonic vehicles.
• Design, implement, and optimise numerical solvers and algorithms for fluid dynamics, heat transfer, and structural analysis.
• Develop coupling strategies between flow, thermal, and structural solvers to enable multi-physics simulation.
• Build robust pre- and post-processing tools, including meshing interfaces, data pipelines, and visualisation workflows.
• Improve performance and scalability through parallelisation (MPI, OpenMP, GPU) on workstations and high-performance computing (HPC) clusters.
• Implement verification and validation (V&V) processes, including regression testing, benchmark cases, and comparison against test data.
• Establish good software engineering practice across the framework: version control, continuous integration (CI), code review, and documentation.
• Work closely with Aerodynamics, Thermal, and Structures engineers to turn analysis needs into reliable, usable tools.
• Support design teams in using the framework, giving them rapid simulation capability for fast-moving design iterations., * A mission driven environment with the opportunity to work on one of Europe’s most consequential defence challenges, with direct impact on sovereign capability and security.
• Daily collaboration with top experts across engineering, operations, and defence, with real opportunity to learn from the best, contribute, and grow.
• High ownership and autonomy; no time tracking, no micromanagement, just clear objectives and accountability for outcomes.
• A fast paced environment where good ideas are implemented quickly, and feedback from test and flight drives real decisions.
• A culture that values clarity, integrity, and excellence, and supports people who take initiative and push boundaries responsibly.
• Competitive compensation and real share options aligned to responsibility and impact, not tenure or hierarchy.

• A hands-on Numerical or Scientific Software Developer with experience building simulation codes from the ground up.
• Degree in Aerospace or Mechanical Engineering, Applied Mathematics, Physics, Computer Science (or related discipline); a PhD or postgraduate research experience in computational methods is a plus.
• Strong programming skills in C++ and/or modern Fortran, with Python for scripting, tooling, and automation.
• Solid understanding of numerical methods such as finite volume, finite element, or finite difference, including discretisation schemes, solvers, and stability.
• Experience with computational fluid dynamics (CFD), heat transfer, or structural codes, whether in-house or open source (e.g. OpenFOAM, SU2).
• Experience with parallel computing and performance optimisation in Linux/HPC environments.
• Comfortable working autonomously in fast-moving, prototype-heavy environments, with a focus on code quality, correctness, and maintainability., Due to the nature of the work we undertake, applicants must be a EU/Nato/German citizen, and be eligible for German Security Clearance.