Case Study

Shop Pay Installments

Installment checkout that stays fast, clear, and risk-aware.

Checkout screen showing installment options and eligibility status.
Back to home

Summary

Software Engineer

Year: 2022 - 2023

  • Checkout
  • Fintech
  • Performance

Problem

Merchants needed higher conversion without adding checkout friction. Installments required clear eligibility, fast decisions, and risk-aware controls.

Approach

How the work shipped.

  • Implemented UI + API flows for pre-qualification and transparent repayment terms.
  • Tuned back-end decisioning queries to keep checkout latency within target.
  • Worked with product to launch incremental rollouts and monitor adoption.

Impact

Outcomes and metrics.

  • <250ms decisioningCheckout latency · p95 target hit
  • Lift observedConversion · merchant cohort pilots
  • Zero regressionsRollout safety · feature flag launches

Stack

Tools and systems.

  • React
  • Ruby
  • PostgreSQL
  • GraphQL
  • LaunchDarkly

Links

Further reading.