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Lumafield

Staff Backend Software Engineer

Builds and owns scalable Python backends, REST APIs, and data pipelines for cloud platform handling X-ray/CT images. Requires 10+ years backend experience, expert Python/Django, deep AWS/PostgreSQL, with mentoring and architecture leadership.

180k – 225kSan Francisco, CABackend EngineeringOnsite10+ YOE
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About the role

What you'll do

  • Own backend architecture for cloud software supporting Neptune, Triton, and Voyager (services, APIs, persistence, async processing, storage and compute integrations).
  • Design, build, and operate scalable Python backends (Django / DRF), Celery pipelines, and REST APIs with strong reliability, performance, and observability.
  • Lead complex, data-heavy workflows: uploads, project/scan lifecycle, recipe automation, task orchestration, and algorithm integration.
  • Architect AWS usage for backends: S3, RDS/Aurora/Postgres, IAM, networking; design SageMaker and related ML job flows (invocation, data paths, security, failure modes, cost) with ML and platform partners.
  • Coach and mentor engineering team members across the organization in architecture best practices and principles.
  • Collaborate closely with product managers and engineering leadership to align technical objectives with business deliverables.
  • Get your hands dirty and build – expect to be hands-on and building regularly

About you

  • Bachelor’s Degree in Engineering or a related field
  • 10+ years of experience developing software, mostly backend
  • Expert Python; 5+ years shipping production backends (Django / DRF a strong fit).
  • Deep PostgreSQL and AWS data/storage (S3, RDS/Aurora); solid IAM and VPC-aware patterns
  • 5+ years production AWS; practical SageMaker (or similar) for services you orchestrate, not only notebooks.
  • Async systems: Celery + Redis or equivalent—queues, retries, idempotency, backpressure, prod debugging
  • 2+ years of startup experience
  • Owned architecture for complex, cloud-hosted, data-heavy products.
  • Demonstrated ability to coach and mentor engineering peers on architectural principles.
  • Experience designing for and complying with SOC2, ISO27001, ITAR, and other security compliance frameworks and standards

Bonus points for

  • Extensive experience with high-traffic, data-intensive web applications.
  • Django + Celery at meaningful scale.
  • Deep expertise in Kubernetes and AWS architecture, security, and optimization.
  • High-throughput or large-payload APIs and pipelines.
  • Regulated or export-controlled environments

Skills

PythonDjangoDrfPostgresAWSS3RdsAuroraCeleryRedisSageMakerKubernetesREST APIs

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