Principal Software Engineer, Money Infrastructure

You will:

• Lead the design, architecture, and implementation of Replit’s core money infrastructure, spanning pricing, billing, payments, and monetization.
• Own and scale the global order-to-cash foundation supporting credit-based subscriptions, usage-based billing, marketplaces, in-app payments, and commerce for Agents.
• Enable rapid pricing and packaging experimentation across the company by building flexible abstractions and APIs for new SKUs, plans, and monetization models.
• Build high-converting, localized payment experiences across geographies — thinking globally while enabling users to pay locally.
• Power builder monetization by creating payment rails for apps, Agents, subscriptions, and new monetization primitives.
• Partner closely on data specifications with finance, accounting, and data teams to produce accurate, auditable, and reliable financial data.
• Collaborate with external monetization and payments partners (e.g. billing platforms, payment processors) to accelerate execution.
• Create monitoring, observability, and feedback systems to proactively detect issues, resolve failures, and optimize performance across financial flows.

Required skills and experience:

• 8+ years of professional software engineering experience, with strong backend expertise.
• Hands-on experience building or operating at least one of the following:
  • Subscription or recurring billing platforms
  • Usage-based or metered billing systems
  • Payment processing platforms
  • SaaS taxation or compliance systems
  • Tokenization or credits-based systems
• Strong system design skills, especially for high-reliability, high-correctness domains like money.
• Comfort working autonomously in ambiguous, fast-moving environments with high business impact.
• Excellent debugging and problem-solving skills, including handling complex billing edge cases and failure modes.
• Experience building customer-facing billing or payments interfaces that simplify complex pricing models.

Tools + Tech Stack for this role:

Rust, TypeScript, React, Postgres, GraphQL, and Node.js.

Bonus points:

• Experience with usage-based billing platforms like Orb, Metronome, or Stripe Billing.
• Experience building coupons, referral programs, credits, or other monetization growth systems.
• Experience working on marketplaces, fintech integrations, or multi-party payment flows.
• Prior work on globally distributed payment systems with localization and compliance considerations.