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apoQlar builds Mixed and Augmented Reality software for medicine with the HoloMedicine® platform - a certified medical device (EU MDR, IEC 62304, ISO 13485). Behind the spatial experience on the headset sits a backend that ingests medical imaging, orchestrates clinical workflows and streams data to XR devices in real time. We are a small, focused team working directly with clinics and partners such as the Mayo Clinic. Location Hamburg/Hybrid or Poznan/Hybrid Tasks As Senior Backend Developer you own the services that power HoloMedicine® behind the scenes: imaging pipelines, clinical orchestration (e.g. our Tumor Board management plane), real-time streaming and the platform APIs that XR clients depend on. You write production-grade C# and Python, make sound architectural calls, and keep everything traceable and release-ready in a regulated environment - working closely with XR engineering, clinical stakeholders and Quality/Regulatory. • Design, build and operate backend services in C# / .NET and Python - APIs, data pipelines and integration services • Work on medical imaging backends: DICOM / DICOMweb, NIFTI handling • Support real-time data flows to XR clients - reliability, latency and session stability • Containerize and ship via Docker / Kubernetes, including workflow orchestration (e.g. Argo Workflows) and CI/CD • Build for observability and security from day one: structured logging/metrics (Grafana / Prometheus / Loki), SBOM/SOUP hygiene (Dependency-Track, Trivy, CycloneDX) • Keep work compatible with MDR / IEC 62304 / ISO 13485 - requirements, risk linkage and traceability, in alignment with Quality/Regulatory • Review code, mentor peers and help shape backend architecture and engineering standards Requirements Must-have • Several years' professional experience building backend services in C# / .NET, plus solid working command of Python • Strong grasp of API design, distributed systems and data modeling — you can reason about architecture, trade-offs and performance as a peer • Hands-on with containers and cloud (Docker, Kubernetes; Cloud a plus) • Comfortable with relational and/or document databases, async messaging and integration patterns • Pragmatic about testing, CI/CD and code quality • Knowledge of medical imaging / DICOM / DICOMweb / FHIR / NIFTI • Fluent in English; German is a plus Nice-to-have • Experience with regulated medical software (EU MDR, IEC 62304, ISO 13485, ISO 14971) • Real-time media / streaming experience (WebRTC, TURN/ICE) • Familiarity with observability stacks (Grafana/Prometheus/Loki) and SBOM/security tooling (Dependency-Track, Trivy, CycloneDX) • Exposure to XR/AR/VR platforms or a clinical environment