Remote Backend Engineer: Real-Time AI Voice Agents

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

Benefits offered by this job

Medical benefits

Dental benefits

Vision benefits

Unlimited PTO

401K

Remote friendly

Parental leave

Job summary

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

This role demands shipping fast while upholding correctness, observability, and uptime in a demanding real-time environment.

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

Data modeling

API design

Real-time systems

Observability

Tools

LiveKit

Twilio

Vercel AI SDK

LangChain

Job description

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

This role demands shipping fast while upholding correctness, observability, and uptime in a demanding real-time environment.