Senior Backend Engineer — AI Agents Platform

Location: Redwood City, CA

Department: HOAi

Location Type: HYBRID

Employment Type: FULL_TIME

Description

• Growing 100% year-over-year 
• Our AI product (HOAi) went from $0 to millions in months 
• Backed by Cove Hill Partners and JMI Private Equity 
• 6M+ doors on our platform, displacing legacy systems 

• 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.

• 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).

• 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.

• Shoot for Impossible and Make it Happen: Sets audacious goals that others might see as unreachable and breaks them into actionable steps. Relentlessly perseveres through obstacles with resourcefulness and determination, turning ambitious vision into tangible results.
• Radical Candor Leads to Humble Excellence: Gives and receives direct, honest feedback with genuine care for others' growth. Stays open-minded on the path to continuous improvement, recognizing that the best outcomes come from carrying no ego.
• Hire and Develop the Best Talent: Actively seeks exceptional people who raise the bar and invests deeply in their growth. Creates opportunities for team members to stretch their capabilities, providing coaching and support that helps them reach their full potential.

• Our eNPS is +68! (Google it, that is great).
• 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.
• Remote Flexible - come to the office when needed.
• Great parental leave benefits.
• Named on Inc 5000 list of America’s Fastest Growing Private Companies.
• Named on Inc 5000 Vet 100 Private Companies list multiple years in a row.
• Winner of Coastal Entrepreneur Award, Technology Category.
• Active employee-led Culture Committee.
• Ongoing industry and professional development trainings available to all employees.
• Multiple leaders on the executive committee recognized as 40 under 40 recipients for contributions to business and community.
• We’re playing offense to win! Our product market fit and our world-class employees make us the leader in our space. We’re building something cool and people like it here.