VERIFIED ENGLISH WORKPLACE

Principal Software Architect — Quantum Platform

Constructor Labs • Germany

100% English First

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Location: Remote within Europe, with regular presence in Bremen Direct Reports: None initially; technical leadership across the engineering group <h2>Mission</h2> 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. <h2>Responsibilities</h2> Pillar 1 Platform Architecture <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> Success Metrics and KPIs: architectural decisions documented and adopted, platform stability, migration delivered to plan. Pillar 2 Hands-on Engineering <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, review, structured logging, dependency governance.</li> <li>Remove single points of failure so no component has only one person who understands it.</li> </ul> Success Metrics and KPIs: test coverage, review discipline, bus factor above one on every core component. Pillar 3 Working with Research <ul> <li>Work day to day with research physicists, translating experimental…