If you're a solo developer or the first technical hire at a startup, here's a practical documentation stack that meaningfully reduces bus factor risk without slowing you down.
Architecture Decision Records (ADRs): Short documents capturing why a significant technical decision was made, not just what was implemented.
Template:
ADR-001: [Decision Title]
Context
What problem are we solving?
Decision
What did we decide?
Alternatives Considered
What else did we look at, and why didn't we choose it?
Consequences
What does this make easier? What does this make harder?
Takes 10 minutes per significant decision. Saves weeks of reverse-engineering for whoever inherits the system.
Loom walkthroughs for complex flows: For anything too nuanced to fully capture in writing, deployment quirks, weird edge cases, "why does this work this way" moments, a 5-minute screen recording captures tribal knowledge that would otherwise live only in your head.
A living wiki, not a stale one: Notion, Confluence, or even a well-organized README hierarchy. The key word is "living", update it as part of the definition of done for significant changes, not as a separate task that gets deprioritized.
Code reviews that actually transfer understanding: Not rubber-stamp approvals. Reviews where the reviewer asks "why" until they genuinely understand the change, not just that it passes tests.
Periodic bus factor drills: Every few weeks, have someone other than the original author explain a module out loud. Gaps in their understanding surface immediately, and that's the actual point.
None of this requires a large team. It requires treating documentation as part of the work, not overhead on top of it.
Full bus factor breakdown on FoundersBar: → https://foundersbar.com/articles-and-research/bus-factor-explained-silent-startup-killer
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