Staff Software Engineer

HubSpot is an AI-powered customer platform that is seeking a Staff Software Engineer to join their Foundry team. In this role, you will build emerging products that solve real go-to-market jobs for small businesses, focusing on AI-driven solutions and rapid product iteration.

Responsibilities:

• Build and ship end-to-end product capabilities (e.g., agentic teammates, lead qualification, AEO, meeting support) from zero to production quickly, delivering meaningful customer value in weekly, high-velocity iterations
• Design and implement AI-powered features: agent orchestration, NLP-driven workflow creation, multi-step reasoning chains, enrichment pipelines, and real-time inference
• Build systems that balance deterministic reliability with agentic flexibility - knowing when a workflow should be predictable and when it should reason
• Own the full stack: frontend experiences, backend services, data pipelines, AI integrations, and infrastructure
• Implement human-in-the-loop patterns, confidence thresholds, fallback behaviors, and guardrails that keep AI products trustworthy at scale
• Prototype rapidly. Test ideas with real users before polishing. Use AI tooling (Cursor, Claude Code, Copilot) to move at startup speed
• Instrument everything. Build for observability so the team can learn from real user behavior and model performance
• Collaborate directly with PM and Design to shape what gets built - you’re not handed specs, you’re co-creating the product

Requirements:

• Experience building and shipping LLM-powered products in production, including prompt design, tool/function calling, structured outputs, and retrieval (RAG). Familiarity with agent patterns and multi-step workflows is important
• Experience working with or building shared platforms, SDKs, or developer infrastructure is a plus
• Bonus for experience with evaluation systems (e.g., prompt testing, datasets, scoring), observability/tracing, and optimizing for latency, cost, and reliability in real-world AI systems
• Have a thirst for technical challenges implemented within secure, compliant systems
• Proven track record of owning and delivering high-impact products end-to-end, driving outcomes that meaningfully move the business forward
• Stay deeply hands-on across the stack while leading by example, working directly with customers and partners to ship, learn, and iterate quickly
• Have a track record of building and scaling solutions that drive meaningful business impact, with a mindset of challenging the status quo and creating step-change improvements rather than incremental gains
• Set clear direction and drive execution on the company's most critical bets, ensuring they translate into real customer and business impact
• Raise the bar for the team through strong technical judgment, clear thinking, and high-quality execution, helping others operate at a higher level through example and direct collaboration
• Demonstrate strong, pragmatic decision-making and problem-solving, consistently balancing speed and quality
• Exhibit an enthusiasm for building reliable, scalable systems
• Can guide teams beyond the status quo; we need engineers who lead us beyond what we have, and towards what we can build, while building a shared notion of how to get there
• Embodies our engineering team values