Vantaca

Senior Backend Engineer — AI Agents Platform (All Levels)

Redwood City, USA · Senior

Sponsorship not specifiedDetected 190 days ago

RailsDistributed SystemsBackend DevelopmentPostgreSQLMySQLAPI DevelopmentOAuthMachine LearningLLMsAgentic AILangGraphDesign SystemsValuationMentoring

About the role

These AI Agents go beyond traditional AI by proactively executing complex, multi-step processes with human-like reasoning-working autonomously, 24/7, across your entire operation.
HOAi was acquired by Vantaca in the fall of 2024.

Own core backend services powering agents: build and operate the agent runtime services (tool execution, state management, orchestration, retries, idempotency, rate limiting).
Design robust APIs and contracts: develop stable, well-versioned APIs (internal + external), including webhook/event interfaces and integration adapters.
Model complex domain data: design schemas and data access patterns that support agent memory/state, workflow history, audit trails, permissions, and multi-tenant isolation.
Integrations at scale: implement and maintain high-quality integrations (OAuth, webhooks, sync engines, connectors) with strong observability and failure handling.
Reliability engineering: define and improve SLIs/SLOs, implement end-to-end tracing, build safety rails (timeouts, circuit breakers, budgets), and run incident response.
Platform performance and cost control: optimize throughput/latency, queue backlogs, caching, storage, and inference/tool-call costs; build guardrails for runaway tasks.
Raise engineering standards: drive code quality, testing strategy, on-call hygiene, runbooks, postmortems, and mentoring.
you'll design systems, ship quickly, measure outcomes, and harden the platform as it scales.
build and operate the agent runtime services (tool execution, state management, orchestration, retries, idempotency, rate limiting).
develop stable, well-versioned APIs (internal + external), including webhook/event interfaces and integration adapters.

Agent architecture familiarity: orchestration patterns, planning/execution loops, memory/state, sandboxed tool execution, human-in-the-loop, safety constraints.
Framework familiarity: Vercel AI SDK, LangChain/LangGraph, Anthropic Agents SDK, OpenAI tool calling, sandboxing/tool runtimes.
The HOAi Way Shoot for Impossible and Make it Happen: Sets audacious goals that others might see as unreachable and breaks them into actionable steps.
Stays open-minded on the path to continuous improvement, recognizing that the best outcomes come from carrying no ego.
Why You Should Join Our Team Our eNPS is +68! (Google it, that is great).

they call tools, integrate with third-party systems, and operate over complex, evolving data.
Vercel AI SDK, LangChain/LangGraph, Anthropic Agents SDK, OpenAI tool calling, sandboxing/tool runtimes.
Our agents execute real workflows: they call tools, integrate with third-party systems, and operate over complex, evolving data.

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).
Great parental leave benefits.
Relentlessly perseveres through obstacles with resourcefulness and determination, turning ambitious vision into tangible results.
Remote Flexible - come to the office when needed.

Description HOAi is a fast-growing startup revolutionizing the community association management industry.
Our AI workforce platform integrates machine learning technology to streamline labor-heavy processes, eliminating inefficiencies and driving scalability.
With rapid growth in the AI space, we are pushing boundaries to redefine industry standards.
HOAi is the leading AI solution for the community association management industry, enabling organizations to deploy AI Agents that function like experienced managers.
This transformation optimizes labor costs, enables growth without additional hires, and ensures faster, higher-quality service for residents and board members.
Vantaca just achieved unicorn status with a $1.25B valuation, so it's safe to say we're past the "scrappy startup phase." We're not just building a successful company - we're building the category-defining platform that will transform how an entire industry operates.

This listing is sourced directly from Vantaca's careers page and normalized into a canonical job model.