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Paulund.

Paul Underwood

I'm a software engineer in the UK. I build and operate small software products, APIs, developer tools and agent workflows.

Most of my recent work is on Bullion API, PostConductor, Satzo and SeedScore. I write about the decisions behind the work in the Notebook.

Selected projects

All projects
Bullion API homepage showing its live gold price API response

Active product

Bullion API

A developer API for current and historical precious metal prices. I built it because market data integrations were harder to reason about than they needed to be.

My work
Product direction, API design, authentication, billing, provider integrations and operations.
Visit Bullion API
PostConductor homepage introducing its agent-ready social API

Active product

PostConductor

A social publishing system designed for people working through AI agents. Its MCP tools are useful to agents while approval stays in human hands.

My work
Product direction, MCP and API contracts, authentication, queueing, billing and delivery workflows.
Visit PostConductor
Satzo homepage showing UK crypto CGT estimate calculator with portfolio preview

In development

Satzo

A UK crypto tracker built around Section 104 pooling, same-day and 30-day matching rules. In development — screenshot from the staging preview.

My work
Product direction, CGT calculation rules, wallet integrations, reporting and operations.
SeedScore homepage showing AI-scored due diligence with a score of 82 out of 100

In development

SeedScore

Automated due diligence for companies raising on Crowdcube and Seedrs, scored by AI across ten categories with every point traceable to a source. In development — screenshot from the staging preview.

My work
Product direction, research pipeline, scoring rubric, Companies House and news integrations.

Open source

Bullion CLIA TypeScript CLI for live gold prices and historical comparisons.Active · TypeScript

Recent Notebook entries

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