Interactive quiz & survey builder with branching and lead capture

We are launching a marketing initiative and need a developer to build an interactive quiz and survey tool that turns passive visitors into qualified leads. The core idea is a multi-step experience: a person answers a sequence of questions, the flow adapts to their choices, and at the end they see a personalized result while we receive their contact details and a full record of what they selected. This is not a static form, it is a small engine, so we care about clean architecture, a reusable question model and a builder interface that a non-technical marketer can operate without touching code. The visual style should match our existing brand and feel light and fast on both desktop and mobile.

Branching logic is the heart of the project. Depending on how someone answers one step, the next step must change, some questions must be skipped, and certain paths must lead to different result screens. We also need answer scoring, so each option can carry weight and the final outcome is computed from the accumulated score, for example a recommendation tier or a category. Lead capture should feel natural at the right moment, validate email and phone, and store every submission together with the answer trail and simple attribution data. Finally we need an analytics view that shows completion rate, drop-off per step, popular answers and a browsable list of individual responses that we can export.

Please propose your stack, share examples of similar interactive forms you have shipped, and outline how you would model branching and scoring so the builder stays flexible as we add new quizzes later. Timeline and milestones are open to discussion.

— Multi-step quiz and survey flow with a no-code builder for editors
— Conditional branching, skip logic and multiple result screens
— Weighted answer scoring that computes the final outcome
— Lead capture with validation and stored answer trail
— Analytics dashboard: completion, drop-off, popular answers, export