Do you mean bank debt or VC-style hybrid debt?
No bank in their right mind would give millions of dollars to a "coder" with a "great" idea.
A bank (or any rational debt holder) has little interest in upside. Their interest is capital protection and repayment.
Debt is typically divided between "asset lends" and "cash-flow lends". You can get serious leverage with an asset lend, maybe 80% of equity, but that assumes you have assets (less debt) as colateral. So if you want $3m, you need at least $3m in equity.
As for cash flow lends, rational debt providers won't go anywhere near even 5 times for an unstable/unproven company. 5 times what? Usually some proprietary measure of earnings (EBIT, EBITDA, EBITDA-C, NPAT, cash flow, etc, adjusted for whatever the bank decides). So for $3m, you usually need $1m in cash-flow already. Even then, you have to deal with monthly or quarterly debt covenant reporting.
Most businesses who qualify for cash flow lends are relatively solid. That's because the covenants are restrictive (and especially frightening for an inconsistent business). A 5% drop in revenue can filter down to a serious drop in the proprietary cash-flow calculation and have the bank calling its capital the next day.
Compare that to a VC scenario. Imagine you've burnt through $3m, sales have dropped, then the bank calls the entire $3m loan. Maybe in the US that stuff flies, but in most responsible financial markets, that means you're toast for 5-7 years. You won't even get a mobile phone contract in some countries.
Of course there are business suited to traditional debt, but I can't imagine the typical HN reader would look for serious capital from credit institutions, unless of course they made serious money and they couldn't get VC for market size reasons.