Senior Backend Engineer (IoT and Wearables)

Senior Backend Engineer (IoT and Wearables) About Us Sapir AI is a Toronto-based robotics and AI startup building connected consumer hardware, including wearables and smart home devices. We're hiring a Senior Backend Engineer to own the systems behind our connected devices, from data pipelines to AI infrastructure. You'll work with high autonomy, taking full ownership from design to production. Responsibilities Backend systems handling real-time device data (video, sensor, and AI inference events) at scaleEdge-to-cloud AI pipelines and third-party machine learning inference integrationsPrivacy-first storage and retention, with on-device processing where possibleEvent-streaming, alerting, and subscription billing infrastructure Requirements 5+ years of backend engineering experience; Python requiredSQL and NoSQL databases (Postgres, DynamoDB/MongoDB)AWS/GCP and streaming infrastructure (IoT Core/Kinesis), Firebase (storage, messaging)API design at scale: REST/gRPC, plus MQTT and/or KafkaVector database systemsNAT (Network Address Translation) traversal techniques (STUN, TURN, ICE)Video/audio/binary data pipelinesCI/CD (Continuous Integration/Continuous Deployment), Docker/Kubernetes, staging/deployment/scaling tooling Nice to Have Production machine learning/large language model inference infrastructure (managed model APIs, vLLM, Triton, or similar)Async/event-driven systems (queues, workers, retries, idempotency)Consumer IoT (Internet of Things)/wearables experience, or any machine learning application with real production trafficOn-device/edge machine learning or privacy-preserving architecture experience Soft Skills Adaptable and comfortable with fast iteration as the product evolvesPragmatic about scale. Builds for today, while understanding where to maintain flexibility to future-proof for growthCollaborative across hardware, firmware, and mobile teams