Principal Software Architect — Quantum Platform

<p><strong>Location:</strong> Remote within Europe, with regular presence in Bremen</p> <p><strong>Direct Reports: </strong>None initially; technical leadership across the engineering group</p> <h2>Mission</h2> <p>Own the architecture of the software platform on which Constructor Labs' quantum group builds. The platform drives physical quantum hardware end to end — calibration, orchestration, experiment execution and device state — and must work both in our own cloud and on customer premises, including restricted and air-gapped environments. The Principal Architect sets the technical direction, makes the structural decisions, and is the senior engineering voice in a group where research and engineering sit closely together.</p> <h2>Responsibilities</h2> <p><strong>Pillar 1 Platform Architecture</strong></p> <ul> <li>Own the end-to-end architecture across backend services, job orchestration, hardware abstraction and device state management.</li> <li>Define the interfaces between the scientific layer and the platform layer so physicists can work without engineering support.</li> <li>Make and carry the build-versus-buy and framework decisions; document them so they survive the people who made them.</li> <li>Lead the migration of the platform onto the Constructor technology stack.</li> </ul> <p><em>Success Metrics and KPIs: architectural decisions documented and adopted, platform stability, migration delivered to plan.</em></p> <p><strong>Pillar 2 Hands-on Engineering</strong></p> <ul> <li>Write production code in the core of the system, not only design documents.</li> <li>Own the hardest components personally — those where correctness and performance both matter.</li> <li>Set and enforce engineering standards: testing