Senior Backend Developer (m/f/d) C# & Python HoloMedicine Platform

apoQlar; Poznań; On-site; Confidential; Full time

Job summary

apoQlar is searching for a Senior Backend Developer to enhance the capabilities of their HoloMedicine® platform, focused on medical software. This role involves building backend services using C#/.NET and Python, ensuring that all solutions meet regulatory standards.

Candidates must have extensive experience in API design, distributed systems, and must be hands-on with Docker and Kubernetes. The position demands a strong understanding of medical imaging and requires fluency in English.

Qualifications

• Several years' experience with backend services in C# / .NET and Python.
• Strong understanding of API design and distributed systems.
• Hands-on with Docker and Kubernetes.
• Knowledge of medical imaging standards like DICOM.

Responsibilities

• Design, build, and operate backend services in C#/.NET and Python.
• Support real-time data flows to XR clients.
• Ensure compliance with MDR and ISO standards.
• Review code and mentor peers.

Skills

C# / .NET

Python

API design

Distributed systems

Docker

Kubernetes

Medical imaging / DICOM

CI/CD

English (Fluent)

Job description

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