Senior Backend Engineer — Real-Time AI Voice Platform

Vantaca, LLC; Redwood City (CA); Remote; USD 180,000 - 240,000; Full time

Benefits offered by this job

Medical benefits

Dental benefits

Vision benefits

401K with Company Match

Remote flexibility

Parental leave

Job summary

HOAi is building a production-grade AI voice agent platform to support real-time, low-latency conversations at scale. The backend powers session orchestration, streaming pipelines, tool execution, integrations, and a robust data layer that enables reliable, debuggable, and continuously improving voice agents.

This role requires shipping quickly without compromising correctness, observability, and uptime in real-time systems, including managing latency budgets and end-to-end tracing.

Qualifications

• 6+ years backend engineering experience with ownership of production systems.
• Strong distributed systems fundamentals, including queues/workers, caching, and operational best practices.
• Excellent data modeling and API design skills (versioning, contracts, idempotency).
• Comfortable in a high-velocity environment; pragmatic, curious, and outcome-oriented.
• Experience building or operating low-latency systems (real-time streaming, WebSockets, RTC, event-driven architectures).

Responsibilities

• Own voice agent backend services: session lifecycle, call routing, participant management, conversation state, and real-time orchestration.
• Build streaming pipelines: integrate and operate STT/TTS and real-time model endpoints; manage latency budgets, backpressure, and jitter.
• Agent runtime + tools: implement tool calling, sandboxed execution, retries/idempotency, rate limits, and per-tenant budgets/quotas.
• Integrations: telephony/RTC providers, calendars/CRMs/support tools, webhooks, and event streams; build durable sync adapters.
• Data platform: model and store transcripts, audio metadata, agent actions, outcomes, evaluations, and audit trails; optimize for query + replay.
• Reliability engineering: SLIs/SLOs, incident response, end-to-end tracing across streaming + tool calls, and automated degradation strategies.
• Security and privacy: secrets management, least privilege, encryption, data retention controls, PII redaction, and tenant isolation.

Skills

Backend engineering

Distributed systems

API design

Real-time systems

WebSockets/RTC

Tools

LiveKit

Twilio

Vercel AI SDK

LangChain/LangGraph

Anthropic Agents SDK

Job description

HOAi is building a production-grade AI voice agent platform to support real-time, low-latency conversations at scale. The backend powers session orchestration, streaming pipelines, tool execution, integrations, and a robust data layer that enables reliable, debuggable, and continuously improving voice agents.

This role requires shipping quickly without compromising correctness, observability, and uptime in real-time systems, including managing latency budgets and end-to-end tracing.