Carbon

Built from an empty directory to a live money path in about eight weeks — the page, the mobile layout, the backend integration, then the on-chain deposit and withdrawal flows. The withdrawal is authorized with a typed-data signature and only reports success once the receipt confirms, because a submitted-but-unmined request showing success is a worse outcome than a slower modal.

Consolidated a scattered sequence of signature prompts into one surface that enumerates what the active trading mode actually requires, shows per-item status, and can run the sequence unattended. An independent audit of that work found concurrency defects, including one I had introduced; the fix replaced a shared depth counter with per-operation tokens so a hung wallet prompt can no longer clear a different signature's guard when it settles late. Both are covered by interleaving tests.

Built the platform analytics suite — open interest, flows, volume, revenue, staking distribution, funding rates — as stacked bars, cumulative lines, and depth charts, then rewrote the axis-domain math. The new algorithm picks the smallest one-two-five step whose multiples cover the padded range inside a fixed tick budget. Measured against the live series, plot-height utilization went from 32% to 85%. The same change fixed a timezone defect that rendered UTC-stamped points under the previous local date.

The subsystem closest to sole authorship: 82% of commits on the team-competition state layer, 74–81% across the rewards surfaces, and the pages that sit on top of them. Built the competition feature end to end, then rebuilt the rewards page around a points gauge, a fee-rebate tier matrix, and season handling.