Introduction
In 2025 HDFC Bank rolled out an all-new HDFC Bank App, redesigned from the ground up with a cleaner interface and an integrated onboarding flow, to replace the long-running legacy MobileBanking app. Migrating tens of millions of customers from a familiar app to a new one is one of the hardest problems in consumer banking: people bank out of habit, and every changed menu becomes a support call or a branch visit. The prompt asks how we would improve the experience for existing customers moving from the legacy MobileBanking app to the new app. I'll clarify the context, segment users, walk through the migration journey, prioritise pain points, propose solutions and define how we measure success.
Step 1
Clarifying Questions (5 mins)
- Why it matters: A parallel run gives room for gradual migration; a hard cutoff makes the first login critical.
- Hypothetical answer: Both are live, and the legacy app will be retired in about nine months.
- Impact: We design for voluntary migration now and forced migration later.
- Why it matters: Points us at the real bottleneck.
- Hypothetical answer: Large drop-offs at device binding and at the first fund transfer, where new security rules apply.
- Impact: Device registration and transfer limits become focus areas.
- Why it matters: Security features often feel like bugs to users.
- Hypothetical answer: For new or re-registered devices, transfers to newly added beneficiaries are capped at ₹50,000 in total during the first 72 hours.
- Impact: We must explain the cooling period and help users plan around it.
- Why it matters: Shapes the north star metric.
- Hypothetical answer: Successful migration with no rise in branch and call-centre load.
- Impact: We measure migrated active users and contact rate together.
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