Designing long-term investing behaviour at scale

Context & challenge

BUX was built for active trading. Investment Plans introduced a fundamentally different behaviour — recurring, automated, long-term investing — into a platform optimised for the opposite.

The challenge

Build a recurring investment system that converts trading intent into durable behaviour, without punishing users when life gets in the way.

My role
Three ownership areas. One system to hold together across four years of iteration.

1

Behavioural system design

Defined how plans are created, paused, resumed, and cancelled. Behaviour durability was the primary constraint — not activation.

2

PM-adjacent scope

Authored the PRD for the IVP navigation tab when product scope was undefined. A design decision had become a product decision nobody had formally made.

3

Multi-phase ownership

Owned design across four phases over four years. Each phase introduced new constraints that required the model to evolve without breaking what existed.

How the Problem Evolved
Users wanted to invest for the long term. The product kept getting in the way.

What we assumed at launch

Users lacked discipline. Remove the friction, enforce the habit, and recurring investing would follow naturally.

What users actually revealed

75% cited DCA as their primary goal — but the top deletion reason was "needed funds." Intent was there. Financial reality kept getting in the way.

What that forced us to rethink

The problem wasn't automation. It was commitment anxiety — and that reframe touched every subsequent decision in the system.

Key Decisions & Trade-offs
Four tensions defined the system. Each one required a decision that couldn't be undone.

Decisions that shaped it

  • Introduced pre-built plans to bypass configurator paralysis
  • Discoverability: 25% → 87% after navigation redesign
  • Plan activation: 2% → 14% overall execution
Outcome & impact
The three user problems that drove IVP's multi-phase evolution each had a measurable response.

Discoverability

Following the navigation redesign and introduction of the tab layer

25% → 87%

Discoverability

Following the navigation redesign and introduction of the tab layer

25% → 87%

Discoverability

Following the navigation redesign and introduction of the tab layer

25% → 87%