What Is Trunk-Based Development? A 2026 Guide for Fast Teams

Trunk-based development sounds like a git technicality, but it’s really a philosophy about how a team ships. Commit small, commit often, all into one branch, and never let work drift off on its own for weeks. Feature flags are what make it safe. Here’s the full picture.

What trunk-based development actually is

Trunk-based development is a workflow where every developer commits to one shared branch - the trunk, usually called main - frequently, at least once a day.

Branches are either very short-lived (a few hours) or skipped entirely. There’s no big feature branch that lives for two weeks and then merges in a scary lump. Everyone integrates their work into the same line constantly.

The obvious objection: how do you merge unfinished work into main without shipping a half-built feature to users? That’s exactly the problem feature flags solve, and it’s why the two go together. More on that below.

Trunk-based development versus GitFlow

The alternative most teams grew up on is GitFlow, or some variant of long-lived feature branches. The contrast is the clearest way to understand trunk-based.

GitFlow uses many long-lived branches; trunk-based uses one that everyone integrates into constantly. With GitFlow you have develop, release, and feature branches that live for days or weeks. Each one drifts further from main while it lives, so when it finally merges, you get a big, conflict-ridden, risky integration.

Trunk-based flips that. Because everyone merges into main every day, integrations are tiny and conflicts are small. You catch “these two changes don’t work together” within hours, not weeks. The trade is discipline: main has to stay releasable at all times, which demands good automated tests.

How feature flags make it possible

This is the connection that matters. To keep committing to main daily, you need a way to merge code that isn’t finished yet without exposing it.

A feature flag lets you do exactly that. You wrap the incomplete feature in a flag that’s turned off. The code merges into main, gets integrated and tested with everything else, and ships to production - but it’s invisible because the flag is off. When the feature is ready, you flip the flag on. No branch needed.

Without flags, you’re forced to keep unfinished work on a side branch, which is the very thing trunk-based development is trying to avoid. So flags aren’t a nice-to-have here - they’re the enabling technology. If you want the how-to, my how to implement feature flags guide covers wiring them in.

Why teams adopt it

The payoff is speed with safety. Small, frequent merges mean:

• Merge conflicts shrink to almost nothing, because changes never drift far apart.
• Bugs surface fast, since everything is integrated and tested together continuously.
• Releasing gets calm, because main is always in a shippable state.

This is why high-performing teams, Google included, work this way. It’s not chaos - it’s the opposite. The discipline of small commits and always-green main is what lets a big team move fast without breaking each other’s work. My trunk-based development guide goes deeper on making the switch, and feature flag best practices covers keeping the flags themselves clean.

The tools that make it safe

Trunk-based development leans entirely on feature flags, so a flag tool is the real dependency. Three solid choices:

• LaunchDarkly is the enterprise standard, with the deepest targeting, around 38 SDKs, and unlimited seats on every tier including the free Developer plan - useful when a whole team needs to manage flags. It’s the most capable option for hiding and rolling out work at scale, with usage-based pricing to weigh.
• Unleash suits teams that want to self-host their flags. It’s open source under AGPL-3.0 and runs in your own infra, with activation strategies and gradual rollouts in the free build. Just note that RBAC and SSO are gated to paid tiers, so plan for that once the team grows.
• Flagsmith is the transparent open-source pick - BSD-3-Clause, genuinely self-hostable, with a free tier of 50,000 requests a month and unlimited flags. For a team adopting trunk-based development on a budget and wanting no lock-in, it’s an easy starting point.

The bottom line

Trunk-based development is small, frequent commits into one shared branch, kept safe by feature flags that hide unfinished work. It beats long-lived branches by making integrations tiny and constant instead of big and rare, which means fewer conflicts, faster bug detection, and calmer releases. The one hard dependency is a solid feature flag setup - without it, you can’t merge incomplete work safely. Get flags in place, keep your commits small, and keep main always releasable.