Sean Matthews

Experience

Boston, MA / Hybrid

Senior Product Manager, APIsJan 2026 – Sep 2026

Agent-ready platform: Helped drive the Headless Klaviyo launch (Sep 2026), opening 490+ APIs and 260+ MCP tools to agents. Oversaw the largest API releases in Klaviyo’s history, with each revision setting a new record.
API strategy: Built the first company-wide capability index, mapping 750+ capabilities to internal and public APIs and giving 50+ teams a common fact base to prioritize high-value gaps.
Agentic readiness: Defined agent-readiness standards and helped drive MCP unification across teams.
Agent swarm: Ramped on the platform with a self-built agent swarm (#7 token consumer org-wide).
API Intelligence: Began as an agent-built onboarding scratchpad and grew into a scorecard of API gaps that 50+ teams reviewed to decide what to close.
Governance: Responsible for the internal platform team that manages governance, frameworks, and quality for internal and public APIs. Helped shape permissioning across APIs and MCP servers.
Data residency: Contributed to Klaviyo’s data residency work.

Exeter, NH & Remote

Co-Owner & Strategic AdvisorJan 2026 – Present

Co-Founder & Product LeaderFeb 2014 – Dec 2025

Technical architecture: Architected 200+ customer-facing integrations reaching upwards of 2 million users, for 100+ software companies.
API strategy: Advised 100+ software companies on API design, developer experience, and integration strategy.
Hands-on engineering: Full-stack developer for 9+ years (TypeScript, Node.js, React, Python, AWS) alongside product and client work. Led a 9-person development team.
Frigg: Created and open-sourced Frigg, a serverless integration framework in production for five years across 20+ integrations, 10+ companies, and millions of users. It ships with a CLI, a management UI, and a Serverless plugin.friggframework.org ↗
Sync at scale: Took a 2-million-record HubSpot sync from failing after 20 hours to finishing in about three.
AI & agent readiness: Build and maintain client MCP servers and AI-readiness materials (Quo, Clockwork Recruiting). Introduced AI-assisted development that delivered up to 10x faster.
Client & commercial leadership: Managed relationships through scoping, launch, renewal, and expansion. Marquee accounts generated $2M+ in lifetime revenue.
Partnerships: Built Zapier and HubSpot partnerships. Advised on marketplaces, embedded integrations, and build-versus-buy decisions.
Data residency: Supported EU and Canada data-residency deployments of Frigg.

Canva: Built three platform apps for a new SDK launch. Designed and built Google Workspace and Slack integrations serving millions of users. Provided design feedback on the Connect API.
Docusign: Led the Zapier and Make.com app overhaul and advised on the Maestro workflow product.
FreshBooks: Rebuilt a Zapier app for a platform launch. Developed HubSpot integrations and data-import tooling.
Quo: Rebuilt an MCP server to release Claude and ChatGPT apps. Rapidly built 10 new integrations.

Writing: Wrote about the six MCP servers every product company will need.Read the post ↗
API directory: Maintain a public list of the 220+ APIs I have personally tested, built against, or reviewed.lefthook.com/apis ↗

Product & platformsAPI strategy · Developer experience · Ecosystems · Agentic readiness · MCP

Languages & architectureTypeScript · Node.js · React · Python · REST APIs · OAuth · Webhooks · Serverless

Platforms & toolsClaude · Codex · Cursor · AWS · GCP · Azure · GitHub · Zapier · n8n · Make · Figma