Frequently Asked Questions

James Watling is an AI engineering leader with 13+ years building products and high-performing teams across startups and scale-ups. He is the cofounder and CTO of Haestus, an AI consultancy that builds production AI systems for companies, and a Senior Engineering Manager at Spring Health. He has a track record of successful startup exits and fundraising rounds totaling $39M+.

James leads engineering teams and builds production AI systems. Through his consultancy Haestus, he designs and ships agentic pipelines, RAG (retrieval-augmented generation) systems, AI phone bots, and multi-agent automation that wire directly into how a business operates. He also works as a fractional and founding CTO, helping startups set technical strategy, hire, and scale their engineering organizations.

Yes. James is open to engineering leadership roles (CTO, VP, Director), first-engineering-hire positions, AI consulting engagements through Haestus, technical due diligence for acquisitions, and technical hiring consulting. The fastest way to start a conversation is to email [email protected] or book a call via Calendly.

Haestus is an AI consultancy cofounded by James Watling that builds agentic infrastructure for businesses that want to become AI-native. Rather than off-the-shelf chatbot wrappers, Haestus ships production AI pipelines — agentic workflows, RAG systems, and LLM automation — designed around how each company already operates. The systems are built to be observable, evaluated, and to compound in value over time. Learn more at haestus.dev.

James and Haestus offer: (1) custom AI applications built end to end; (2) agentic pipelines and multi-agent orchestration that automate real business processes; (3) RAG systems that ground LLMs in a company's own data; (4) AI phone bots and voice agents; (5) AI strategy — identifying the high-leverage manual processes worth automating; and (6) evaluation and observability so AI systems can be measured and trusted in production.

A fractional CTO is an experienced engineering leader who works with a company part-time to provide the technical strategy, architecture, and team leadership of a full-time CTO without the full-time cost. James offers fractional and founding-CTO engagements, drawing on experience as Founding CTO at EarlyDay (acquired by Wonderschool) and engineering leadership roles at Spring Health, Wonderschool, and Hub.

Yes. Building agentic systems is James's core focus. He works daily with Claude Code, the Claude Agent SDK, the Model Context Protocol (MCP), and multi-agent orchestration. Through Haestus he ships agentic pipelines that research, reason, take actions through tools, and document their decisions — built with the guardrails and evaluation needed to run reliably in production.

RAG (retrieval-augmented generation) is an architecture that grounds a large language model in a company's own data — documents, databases, and knowledge bases — so its answers are accurate and current rather than generic. James designs and ships production RAG systems through Haestus, including the vector databases, retrieval, and evaluation needed to make them dependable.

Yes. AI phone bots and voice agents are part of Haestus's offering. These are autonomous voice systems that can handle real conversations — answering calls, qualifying leads, booking appointments, and taking actions — built end to end and integrated with the tools a business already uses.

James is currently Senior Manager, Engineering at Spring Health (Series E). He was Senior Engineering Manager at Wonderschool, Founding CTO at EarlyDay (acquired by Wonderschool), and Senior Software Engineer at Hub, where he worked with LinkedIn co-founder Eric Ly. Earlier roles include Team Lead at GuavaPass (acquired by ClassPass), Senior Front End Developer at KarmaCheck, and Senior Ruby on Rails Developer at Roomorama.

Yes. James has a track record of successful exits and fundraising totaling $39M+. He raised $4M+ and led technical due diligence for EarlyDay's acquisition by Wonderschool, was a key contributor to Hub's $20M token sale, contributed to KarmaCheck's $15M Series A, and led the GuavaPass engineering team through its acquisition by ClassPass.

Yes. James offers technical due diligence for investors and acquirers evaluating a company's engineering team, architecture, and codebase. He has led technical due diligence from both sides of M&A — as the founding CTO whose company was acquired (EarlyDay) and as the team lead navigating an acquisition (GuavaPass by ClassPass).

At Spring Health, AI-powered engagement features James helped drive cut member ejection rates from 16% to 6%. At EarlyDay, he pioneered AI implementations that reduced approval times from 48 hours to under 2 minutes. At Wonderschool, a new software delivery lifecycle improved deployment frequency by 300% and reduced support tickets by 85%.

James's AI stack includes Claude Opus, Claude Code, the Claude Agent SDK, the Model Context Protocol (MCP), GPT-5, LangGraph, multi-agent orchestration, RAG and vector databases, and Cursor. His engineering stack spans TypeScript, Next.js, React and React Native, Ruby on Rails, GraphQL, and AWS/GCP.

The Bot Portfolio is a project by James Watling in which an autonomous AI agent trades a real $1,000 account with every decision made fully in public. The agent uses MCP servers to execute real trades, researches the market, reasons through a thesis, places trades through its tools, and documents every step in a public journal. It serves as a proving ground for the agentic reasoning, tool use, and guardrails James brings into client work at Haestus. See thebotportfolio.com.

You can email James at [email protected], book a 30-minute call via Calendly, connect on LinkedIn, or reach out about AI work through Haestus.