Cloud Engineer - Quantum Computing (m/w/d)

Cloud Engineer - Quantum Computing (m/w/d) at eleQtron, Siegen, Nordrhein-Westfalen, Germany. A mid-level full time position in the Quantum Firmware team, listed under software engineering.

We are looking for a Cloud Engineer (m/f/d) to join us in Hamburg or Siegen and build and operate the scalable, secure cloud platform that connects users with our trapped-ion quantum computers.

Responsibilities

You will join our Quantum firmware Team as a Cloud Engineer. You will build the layer through which the world reaches our quantum computers. Users submit quantum programs; your services compile, schedule, and dispatch them to our machines and return the results:

• Build and operate the cloud services that let users submit quantum programs to our systems and retrieve their results.
• Develop and deploy our compilation pipeline as a scalable cloud service , from circuit input through transpilation down to hardware-level instructions
• Design and maintain the public API and SDK entry points to our platform
• Implement job queuing, scheduling, and dispatch towards the hardware backends, including quota, prioritisation, and result handling
• Own authentication and authorisation across the platform: user and tenant identity, API keys and tokens, and role-based access to machines, jobs, and results, built on an established identity provider rather than from scratch
• Guarantee tenant isolation, so that quantum programs and results are never visible across customer boundaries, and manage secrets and credentials across the stack
• Work with the quantum firmware and hardware teams on the interfaces between cloud services and the machine itself
• Instrument the platform for observability and keep an eye on latency, throughput, and cost

What you can expect from eleQtron

• Competitive salary: We value our team members and therefore provide remunerations that reflect this, additionally rewarding achievements
• Flexible working hours : We offer personal freedom through a variety of flexible work schedules
• Team spirit: In our international and diverse team, and with our regular team events, having fun at work is simply part of the culture

Requirements

• 3+ years of hands-on experience building and deploying backend or platform services in production
• Strong Python; additional systems-level language experience (Go, Rust, C++) is welcome
• Solid API design skills (REST and/or gRPC) for services other developers have to use
• Practical experience implementing authentication and authorisation in production systems: OAuth 2.0 / OpenID Connect, token handling, and role-based access control
• Secure engineering habits: least privilege by default, proper secrets management, and awareness of dependency and container supply-chain risks
• Infrastructure as code (Terraform, Pulumi, or similar) and CI/CD pipelines (GitLab CI, GitHub Actions, or similar)
• Working understanding of GDPR and data residency requirements, and a genuine interest in digital sovereignty
• Ability to collaborate effectively with experimental physicists and engineers
• Strong adaptability and a quick learning mindset
• Good proficiency in English (written and spoken); German is an advantage for working with public-sector partners

Nice to Have

• Running an identity provider in production (Keycloak, Zitadel, Ory, Authentik, or a managed IAM service)
• Multi-tenant isolation patterns in SaaS platforms
• Contributing to security certification work (ISO 27001, BSI IT-Grundschutz, BSI C5) or acting on penetration test findings
• Familiarity with quantum SDKs and toolchains (Qiskit, Cirq, PennyLane, QIR) or hardware abstraction interfaces such as QDMI
• Batch scheduling or HPC environments (Slurm or similar)
• Observability stacks such as Prometheus, Grafana, or OpenTelemetry
• Prior exposure to quantum computing or other deep-tech domains

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