Vantaca · 16 hours ago
Senior Backend Engineer — AI Voice Agent Platform
Redwood City, CA
Full-time
Hybrid
Senior Level
6+ years expVantaca is a fast-growing startup revolutionizing the community association management industry. The Senior Backend Engineer will build a production-grade AI voice agent platform that supports real-time conversations, ensuring high correctness and uptime in real-time systems.
Artificial Intelligence (AI)Business IntelligenceBusiness Process Automation (BPA)Property ManagementSoftware
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
Qualification
Required
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)
Preferred
Voice/real-time experience: WebRTC/RTC providers, telephony, streaming audio, SIP concepts, jitter/packet loss mitigation
LLM and agent architecture experience: tool calling, planning/execution loops, memory/state, eval harnesses
Familiarity with SDKs/frameworks: LiveKit, Twilio/telephony stacks, Vercel AI SDK, LangChain/LangGraph, Anthropic Agents SDK
Experience with observability for real-time systems (OpenTelemetry traces spanning streaming + async workflows)
Benefits
Medical, Dental, and Vision kick in day one.
Unlimited PTO (with a requirement for employees to take a minimum of one continuous week per year).
401K with Company Match.
Great parental leave benefits.
Ongoing industry and professional development trainings available to all employees.
Company
Vantaca
Vantaca is an AI-driven platform that automates community management tasks while fostering growth and stronger relationships.
201-500 employees
H1B Sponsorship
Vantaca has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (7)
Funding
Current Stage
Growth StageTotal Funding
$305MKey Investors
Cove Hill PartnersJMI Equity
2025-10-15Private Equity· $300M
2022-02-18Series Unknown· $5M
Leadership Team
Dave Sweyer
Founder
Recent News
2025-11-19
2025-11-12
Company data provided by crunchbase