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Forward Deployed Infrastructure Engineer at Sirius

Join Sirius in San Francisco as a Forward Deployed Infrastructure Engineer and own the embedded product that powers business-critical data for our customers. We're looking for an engineer who understands that the widget is the product, focusing on high-performance SDKs and conversion-driving UIs. If you have experience building for fintech leaders or analytics platforms and thrive in early-stage environments where performance is paramount, this is your chance to shape a core piece of infrastructure.

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Sirius

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Location

San Francisco, United States

Compensation

Not Disclosed

Company

Sirius

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Role overview

As a Forward Deployed Infrastructure Engineer at Sirius, you will own the end-to-end lifecycle of our core embedded product. You’ll build high-performance SDKs and widgets that live inside customer applications, optimizing for bundle size and load speed. This role combines deep frontend engineering with a focus on business-critical metrics like conversion and retention.

AI Retention Agent

Recover your revenue automatically. Sirius meets customers at the moment of cancellation across your app and AI support agents.

What you will do

  • Develop and maintain third-party scripts, iframes, and SDKs designed to be embedded directly into diverse customer environments.
  • Optimize load performance and minimize bundle sizes to ensure our one-line SDK never degrades the performance of a host site.
  • Build data-dense dashboards and consoles that clearly visualize offer performance, churn signals, and cohort data for end-users.

Who this is a fit for

  • Proven experience building B2B SaaS interfaces or fintech UI for companies specializing in conversion-critical flows and analytics.
  • Expertise in developing embeddable widgets or snippets that maintain high trust signals while living inside another company’s product.
  • Previous experience at a Seed or Series A startup with a track record of iterating on existing codebases rather than just greenfield projects.

Why this role is remarkable

  • Own the core product: At Sirius, the widget is the product rather than just frontend glue, giving you direct impact on how customers interact with our technology.
  • High-stakes engineering: Build conversion-critical flows where performance and bundle size are the difference between success and failure for our enterprise partners.
  • Early-stage autonomy: Join an agile Seed/Series A team where you have the autonomy to perform your own design QA and shape the engineering culture.

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