Vantaca · 17 hours ago
Senior Backend Engineer — AI Agents Platform
Redwood City, CA
Full-time
Hybrid
Senior Level
6+ years expVantaca is a fast-growing startup revolutionizing the community association management industry with its AI workforce platform. The Senior Backend Engineer will own the backend systems for AI agents, focusing on building reliable services, designing robust APIs, and ensuring platform performance and reliability.
Artificial Intelligence (AI)Business IntelligenceBusiness Process Automation (BPA)Property ManagementSoftware
Responsibilities
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
Qualification
Required
Experience: 6+ years building backend systems for production SaaS, platforms, or distributed systems
Backend depth: strong fundamentals in distributed systems, concurrency, queues/workers, caching, and production operations
Data modeling strength: excellent relational modeling (Postgres/MySQL), migrations, indexing, query optimization, and data correctness
API design excellence: proven ability to design clear, evolvable APIs and contracts across services and external partners
High pace + high quality: you thrive in fast-moving environments without sacrificing reliability or security
Curiosity and ownership: you enjoy ambiguous problems, learn quickly, and take systems end-to-end (build → ship → operate)
Preferred
LLM experience: building product with LLMs (prompting, tool calling, evals, latency/cost tradeoffs)
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
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