Interview Platform

The Problem

Interview practice needs concrete evidence about what someone has done. I wanted career notes, retrieval, and coding exercises to work across tools without coupling every feature to one desktop app.

Distinct Responsibilities

Recall-Seed is a C#/.NET MCP server. Its 19 tools retrieve and store career evidence, check citation identifiers, and seed coding challenges into Scroll. The calling model generates language; the server supplies source material and validation.

STARfolio is the Electron desktop surface for career notes and mock interviews. SQLite FTS5 and sqlite-vec support keyword and vector search.

Scroll is an implemented editor with sync server and agent-facing endpoints. Relative viewport anchoring keeps edits above the visible region from moving the reader’s screen.

Backend Decisions

One IExperienceStore interface supports Markdown-vault and SQLite implementations. Tools use that interface rather than knowing how each backend stores notes. The SQLite path uses WAL mode and a stable read/write contract.

Coding challenges cross a separate boundary: Recall-Seed provides the problem schema; Scroll hosts the editor and grader, then posts the verdict back with a correlation identifier.

Verification and Limits

Recall-Seed CI builds Release, runs xUnit tests, and exercises the stdio protocol from initialization through a tool call. Source-linked example runs show how thin evidence produces a gap question.

Citation checks verify that referenced identifiers exist. They are not a guarantee that every generated statement is true.

Scroll’s treap has differential property tests against a simpler reference structure. A targeted sweep of 20 hand-built mutants reached near-total detection; the separate whole-suite mutation run reported 86–95% on covered code. Those measurements assess test sensitivity, not production reliability.