Senior/Principal Product Manager, API & Integration Platform

Get to Know Us

At Horizon3.ai, we’re redefining the offensive cybersecurity space—and we need a forward-thinking, technically fluent Senior Product Manager to lead our API platform, integration strategy, and MCP server development. This high-impact role is central to enabling scalable integrations, extensibility, and automation across our product ecosystem.

You’ll work closely with engineering, platform architects, and customers to shape our developer-facing APIs, internal service interactions, and third-party integrations. This is a pivotal opportunity for a product leader who thrives at the intersection of developer experience, system architecture, and platform product strategy.

We’re looking for someone with a builder’s mindset, a strong technical foundation, and a track record of driving cross-functional execution. If you’ve led platform/API initiatives, owned integration roadmaps, or shipped complex backend products in a high-growth SaaS environment, we want to hear from you.

What You’ll Do

• Own the API & Integration Platform Vision – Define and drive the strategy for our external and internal APIs, ensuring scalability, security, and ease of use for both internal teams and external developers.

• Drive MCP Server Product Development – Partner with engineering to evolve our Model Context Protocol (MCP) server—focusing on orchestration, performance, and extensibility.

• Lead Integration Strategy – Build and manage a portfolio of third-party integrations (e.g., ticketing, SIEMs, EDRs, SOARs, identity providers). Prioritize based on customer needs and strategic value.

• Define Developer Experience – Champion a best-in-class developer journey. Ensure our API documentation, SDKs, authentication flows, and sandbox environments are intuitive and robust.

• Work Cross-Functionally – Collaborate with Security Research, Engineering, and Customer Success to translate technical requirements into scalable platform features.

• Translate Complexity into Roadmaps – Break down complex technical concepts into actionable plans. Prioritize and sequence platform enhancements to support both customer use cases and internal product needs.

• Enable Internal Product Teams – Ensure APIs and internal services are reusable, well-documented, and built for scale. Partner closely with other product managers to drive alignment and platform consistency.

What We’re Looking For

• You’ve worked at high-growth SaaS startups and know how to move fast without breaking things.

• You’ve led API platform or integration product efforts at a SaaS or cybersecurity company.

• You’re comfortable owning deeply technical products—APIs, servers, internal microservices—and working with architects and senior engineers.

• You’ve driven adoption of APIs, SDKs, or integration frameworks by both internal developers and external partners.

• You think in systems and platforms, not just features.

• You balance user needs, technical feasibility, and strategic impact in every decision.

• You excel at cross-functional collaboration and aligning product vision with technical execution.

• You’re comfortable getting into the weeds—whether it’s in spreadsheets, dashboards, or user flows—and just as comfortable zooming out to set direction.

Required Background

• 6+ years of experience in product management or technical product roles, ideally in B2B SaaS or cybersecurity

• Demonstrated ownership of API platforms, developer tooling, or integration ecosystems

• Strong technical fluency—comfortable working with RESTful APIs, authentication standards (OAuth, SAML), and backend architectures

• Experience partnering with platform, infrastructure, or backend teams

• Familiarity with Agile methodologies and product delivery in complex technical environments

Bonus Points

• Prior hands-on development experience or a CS/engineering degree

• Experience with agentic AI workflows and tools

• Exposure to event-driven architecture, service orchestration, or middleware products

• Background in cybersecurity, IT automation, or infrastructure tooling

• Experience with developer platform metrics, SDK adoption, and community engagement

Location & Travel Requirements

• Preferred location: San Francisco Bay Area, New York

• Up to 15% travel required

Compensation and Values:

At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy