Senior Software Engineer, Developer Platform

About Warp

Warp is building self-driving employee management. Payroll, tax compliance across thousands of jurisdictions, benefits, IT, and HRIS that runs autonomously so companies never have to think about back-office operations again.

We process hundreds of millions in payments across 1,000+ companies. Revenue has grown 5x+ YoY for two years. We're a team of ~40 in NYC in Flatiron, scaling fast, and expecting to be 100 people by end of year.

The incumbents (ADP, Paylocity, Paychex) built their businesses by profiting from complexity. Even the modern players are bolting chatbots onto legacy systems. Warp is built from day one for AI to be the primary operator, not a feature. Every advance in LLM capability widens our lead.

We hire people who ship constantly, own outcomes, and care about craft. We're in the office five days a week because speed and proximity are a competitive advantage at this stage. If you want to build something that automates an entire category of core work, not just another point solution, this is the place.

Backed by $25M+ from Ashton Kutcher/Sound Ventures, Y Combinator, founders of Dropbox, Replit, SV Angel, and Homebrew Capital. Built by an obsessive team from MIT, Ramp, Brex, Google, Dropbox, Apple, and more.

About the Role

As a Senior Software Engineer focused on Developer Platform at Warp, you'll build the external-facing API layer that lets companies programmatically control payroll, benefits, HR, IT, and more. That means designing robust APIs, building OAuth flows and authentication infrastructure, webhook delivery systems, event log infrastructure and the products that make them queryable, SDK generation, and world-class documentation. You'll own the full developer experience, from the reliability of the underlying platform to the clarity of the docs, and be the primary interface between Warp's core systems and the developers who build on top of them.

What You'll Do

• Design, build, and maintain Warp's external APIs

• Build webhook infrastructure: reliable delivery, retries, failure visibility

• Build event log systems and the products that make them queryable by customers and partners

• Build OAuth and authentication infrastructure for third-party integrations

• Own SDK generation and developer tooling

• Write and maintain developer documentation

• Handle technical communications with integration partners and enterprise customers

• Define the API platform roadmap in collaboration with the CTO

You'll Be Good for This Role If You

• Have built developer-facing APIs and platforms that external developers rely on

• Have experience building webhook systems, event streaming, or audit log infrastructure

• Care deeply about API ergonomics, consistency, and documentation quality

• Have owned a developer platform or external API at a high-growth startup

• Understand the hard parts of external APIs: idempotency, versioning, backwards compatibility, and graceful failure

• Are comfortable being the face of Warp's API: writing docs, talking to developers, owning the experience

What You Need

• 5+ years of software engineering experience

• Experience building and maintaining public-facing APIs at scale

• Experience with SDK generation or developer tooling

• Strong written communication skills

• Willingness to work from our NYC office five days a week