Make a securities interface reusable.

A securities tool brings accounts, markets, positions, values and actions into a dense working surface. Visually similar controls can have very different consequences, so component boundaries cannot be based on appearance alone.

The aim was to reduce repeated interface construction while preserving business meaning. I researched component-library methods and business-unit decomposition with colleagues, then developed the relevant structures into components and guidelines.

For account positions, the table, account context and controls can become reusable units while keeping their relationships explicit. A shared structure only works when its meaning and behaviour match.

My responsibility included the relevant component design, usage specifications and ongoing maintenance. Where tasks have different rules, preserving those differences matters more than forcing consistency.

The source “Table / Account Positions” component includes default, selected, hover and no-data variants. Feedback needs to explain what changed while keeping information position and reading order stable.

The specification therefore addresses both appearance and behaviour across situations. Consistent state definitions also give maintenance work a shared reference.

Buy, sell, confirm, cancel and input controls have related structures, but are not the same action. I maintained components and specifications to give repeated modules a consistent foundation while preserving these distinctions.

The components supported cross-project reuse and day/night theme adaptation. These experiences demonstrate a qualitative maintenance benefit; historical time savings were not measured.