Senior Product Manager, APIs

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Product Manager, APIs based in United Kingdom. As a Senior Product Manager, APIs, you’ll own a technical product area end to end, from product strategy and architecture to adoption and long-term customer experience. You’ll work as a close peer to engineering leadership and staff engineers, contributing directly to technical direction and design decisions. The role combines product management with hands-on technical exploration, including building prototypes and writing functional code to validate ideas and reduce uncertainty. You’ll own API products and integrations, ensuring strong contracts, backwards compatibility, developer experience, and reliable adoption. You’ll work closely with operational specialists to understand real workflows, identify root causes, and prioritize solutions that address meaningful business problems. This is an individual contributor role in a high-growth environment where strong judgment, ownership, experimentation, and clear written communication are highly valued. You’ll have the opportunity to influence products that solve complex operational challenges while working across product, engineering, payroll, tax, and business teams.