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Open nowPosted 18 days ago

Principal Software Architect — Quantum Platform

Constructor Labs25 open roles

Where
Germany
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Your applicationOpen nowPrincipal Software Architect — Quantum PlatformConstructor Labs · Germany

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  5. 33.9%30 days
This job: posted 18 days ago

The posting

Location: Remote within Europe, with regular presence in Bremen

Direct Reports: None initially; technical leadership across the engineering group

Mission

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.

Responsibilities

Pillar 1 Platform Architecture

  • Own the end-to-end architecture across backend services, job orchestration, hardware abstraction and device state management.
  • Define the interfaces between the scientific layer and the platform layer so physicists can work without engineering support.
  • Make and carry the build-versus-buy and framework decisions; document them so they survive the people who made them.
  • Lead the migration of the platform onto the Constructor technology stack.

Success Metrics and KPIs: architectural decisions documented and adopted, platform stability, migration delivered to plan.

Pillar 2 Hands-on Engineering

  • Write production code in the core of the system, not only design documents.
  • Own the hardest components personally — those where correctness and performance both matter.
  • Set and enforce engineering standards: testing, review, structured logging, dependency governance.
  • Remove single points of failure so no component has only one person who understands it.

Success Metrics and KPIs: test coverage, review discipline, bus factor above one on every core component.

Pillar 3 Working with Research

  • Work day to day with research physicists, translating experimental workflows into software.
  • Keep the research and engineering collaboration model intact as the group grows.
  • Support the product function with realistic estimates and honest technical constraints.

Accountability: research team able to run experiments without engineering bottlenecks.

Requirements

Experience

  • 10+ years building production software systems, with real depth in Python, C#/.NET or C++.
  • Distributed systems, job scheduling, and interfacing with instruments or physical hardware.
  • Track record as the senior technical voice in a small team.
  • Delivered software into on-premise and restricted environments, not only cloud.

Skills & Competencies

  • Able to hold an architecture in your head and explain it simply to people who are not engineers.
  • Comfortable in a scientific domain. A physics degree is not required, genuine interest is.
  • Pragmatic about trade-offs; able to ship rather than perfect.
  • Strong written communication. Decisions that are not written down do not exist.

Education & Languages

  • Degree in computer science, physics, engineering or equivalent practical track record.
  • Fluent English. German useful, not required.

What This Role Is (and Is Not)

This role IS

  • Deeply hands-on, with real authority over technical direction.
  • Central to everything the quantum group builds.
  • A role where you will have peers and a platform behind you.

This role is NOT

  • A management track role.
  • An architecture-committee or advisory position.
  • A role where someone else writes the hard code.
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