Senior Backend Engineer, Infrastructure

Ellipsis Health, Inc

$175K — $250K *
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 4+ years building production back-ends in modern Python.
  • Experience with real-time streaming systems (WebRTC, WebSockets, gRPC) and proficiency in async frameworks.
  • Strong knowledge of concurrency, buffering, and audio codecs.
  • Understanding of cloud services (AWS/GCP/Azure), container orchestration, and message queues.
  • Proficient with relational and in-memory data stores for conversational state management.
  • Excellent communication skills with an emphasis on deployable software.

Responsibilities

  • Expand and maintain the real-time voice pipeline with Python micro-services for AI orchestration.
  • Integrate new providers, add plug-ins for ASR, TTS, and memory services, and build API endpoints.
  • Optimize for ultra-low latency, managing buffering and concurrency efficiently.
  • Implement observation mechanisms for pipeline stages and define service level objectives (SLOs).
  • Ensure robustness for production environments with reliable messaging and security measures.
  • Collaborate cross-functionally to deliver features like voice cloning and memory retrieval.

Benefits

  • 401k matching up to a specified percentage.
  • Health, vision, and dental insurance.
  • Flexible paid time off.
Full Job Description
Responsibilities:
  • Expand and maintain our real-time voice pipeline: design, implement, and
    maintain Python micro-services for conversational AI orchestration-audio
    capture, streaming transcription, prompt/LLM logic, synthesis, and playback.
  • Integrate new providers & transports: add plug-ins for emerging ASR, TTS,
    LLM, and memory services; wire up WebRTC, SIP, or phone endpoints; build
    adapters that allow hot-swapping components without downtime. Build API
    endpoints.
  • Deliver ultra-low latency (
    FastAPI, gRPC), optimize buffering, concurrency, and back-pressure handling.
  • Instrument & observe every hop: emit structured traces (OpenTelemetry),
    metrics, and logs for each pipeline stage; define SLOs for first-token latency,
    end-to-end latency, and streaming reliability.
  • Harden for production: implement graceful retries, idempotent message
    passing, circuit breakers, and HIPAA-compliant security (encryption in transit,
    per-tenant isolation, secrets rotation).
  • Collaborate cross-functionally with ML, product, data engineering, and
    client-SDK teams to deliver features such as voice cloning, multimodal hand-offs,
    and domain-specific memory retrieval.


Qualifications:
  • 4+ years building production back-ends in modern Python.
  • Proven experience with real-time streaming systems-WebRTC, WebSockets,
    or gRPC streaming-and proficiency with asyncio, FastAPI, or similar async
    frameworks.
  • Deep understanding of concurrency, buffering, audio codecs (Opus, PCM), and
    distributed tracing.
  • Solid understanding of AWS/GCP/Azure, including container orchestration
    (Kubernetes/EKS/GKE), message queues (Kafka/SQS/Pub/Sub), and IaC
    (Terraform).
  • Solid grasp of relational (PostgreSQL) and in-memory (Redis) data stores; able
    to model and persist conversational state.
  • Excellent communication skills and a bias for measured, observable, and
    continuously deployable software.
    Bonus Points:
  • B.S./M.S. in CS, EE, or related fields.
  • Familiarity with voice-agent frameworks,
  • Hands-on with telephony (Twilio, Telnyx), SIP, or PSTN integrations.
  • Experience integrating multimodal inputs (vision, text chat) into voice agents.
  • Familiarity with GPU inference and streaming pipelines.
  • Prior work in regulated industries (healthcare, finance) and comfort preparing for
  • SOC 2 / HIPAA audits.
Salary and Benefits

We offer competitive salary and benefits, including 401k matching up to a certain

percentage of your salary, health, vision, and dental insurance, and very flexible paid

time off.

The typical salary range for this role is $175,000 to $250,000 USD. The amount

offered will be determined by a variety of factors including but not necessarily limited to

your individual skills, qualifications, and past experience relative to the requirements of

the role.

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