Fund Lens is a demo I built to explore putting an LLM behind a real financial workflow. A FastAPI backend takes structured company metrics — revenue, burn, runway, margins, growth — and asks Claude to produce analyst-quality output: a plain-English narrative, key insights, risk flags, and concrete recommendations, grounded with live market context (Treasury yields, the VIX, S&P 500, SaaS multiples) pulled in at request time. Beyond one-shot analysis, there's an 'Ask CFO' mode with multi-turn conversation memory, and a portfolio-compare endpoint that puts two companies side by side across growth, profitability, and financial health. The interesting design work was shaping the prompts and response schemas so the output stays consistent and parseable instead of free-form prose.