Platform Engineering

2 min read

What is Trunk-Based Development?

TL;DR

Trunk-based development (TBD) is a source-control branching model where all developers commit to a single branch ("trunk" or "main") at least once per day.

⚡ Trunk-Based Development at a Glance

📂

Category: Platform Engineering

⏱️

Read Time: 2 min

🔗

Related Terms: 3

❓

FAQs Answered: 2

✅

Checklist Items: 5

🧪

Quiz Questions: 6

📊 Key Metrics & Benchmarks

2-6 weeks

Implementation Time

Typical time to implement Trunk-Based Development practices

2-5x

Expected ROI

Return from properly implementing Trunk-Based Development

35-60%

Adoption Rate

Organizations actively using Trunk-Based Development frameworks

2-3 levels

Maturity Gap

Average gap between current and target state

30 days

Quick Win Window

Time to see first measurable improvements

6-12 months

Full Impact

Time for comprehensive Trunk-Based Development transformation

Trunk-based development (TBD) is a source-control branching model where all developers commit to a single branch ("trunk" or "main") at least once per day. Long-lived feature branches are avoided; short-lived branches (less than 24 hours) are acceptable.

TBD enables continuous integration by ensuring that integration happens continuously — every commit is integrated immediately, not after weeks of branch divergence. Feature flags gate incomplete features, allowing code to be merged to trunk before the feature is fully complete.

The alternative — GitFlow with long-lived branches — creates merge conflicts, delays integration, and hides bugs that only appear when branches finally merge. Research by DORA (DevOps Research and Assessment) shows trunk-based development is a strong predictor of elite software delivery performance.

🌍 Where Is It Used?

Trunk-Based Development is implemented across modern technology organizations navigating complex digital transformation.

It is particularly relevant to teams scaling beyond their initial product-market fit, where operational maturity, predictability, and economic efficiency are required by leadership and investors.

👤 Who Uses It?

**Technology Executives (CTO/CIO)** leverage Trunk-Based Development to align their technical strategy with overriding business constraints and board expectations.

**Staff Engineers & Architects** rely on this framework to implement scalable, predictable patterns throughout their domains.

💡 Why It Matters

Trunk-based development is one of the strongest predictors of high-performing engineering teams. It enables continuous deployment, reduces merge conflicts, and forces early integration of changes.

🛠️ How to Apply Trunk-Based Development

Step 1: Assess — Evaluate your organization's current relationship with Trunk-Based Development. Where is it strong? Where are the gaps?

Step 2: Define Goals — Set specific, measurable targets for Trunk-Based Development improvement aligned with business outcomes.

Step 3: Build Plan — Create a phased implementation plan with clear milestones and ownership.

Step 4: Execute — Implement changes incrementally. Start with high-impact, low-risk improvements.

Step 5: Iterate — Measure results, learn from outcomes, and continuously refine your approach to Trunk-Based Development.

✅ Trunk-Based Development Checklist

Assess your organization's current Trunk-Based Development maturityIdentify quick wins for Trunk-Based Development improvementCreate a 90-day Trunk-Based Development action planAssign ownership for Trunk-Based Development initiativesMeasure and report progress quarterly

📈 Trunk-Based Development Maturity Model

Where does your organization stand? Use this model to assess your current level and identify the next milestone.

Initial

14%

No formal Trunk-Based Development processes. Ad-hoc and inconsistent across the organization.

Developing

29%

Basic Trunk-Based Development practices adopted by some teams. Documentation exists but is incomplete.

Defined

43%

Trunk-Based Development processes standardized. Training available. Metrics established but not yet optimized.

Managed

57%

Trunk-Based Development measured with KPIs. Continuous improvement active. Cross-team consistency achieved.

Optimized

71%

Trunk-Based Development is a strategic advantage. Automated where possible. Data-driven decision making.

Leading

86%

Organization sets industry standards for Trunk-Based Development. Published thought leadership and benchmarks.

Transformative

100%

Trunk-Based Development drives business model innovation. Competitive moat. External recognition and awards.

⚔️ Comparisons

Trunk-Based Development vs.	Trunk-Based Development Advantage	Other Approach
Ad-Hoc Approach	Trunk-Based Development provides structure, repeatability, and measurement	Ad-hoc requires zero upfront investment
Industry Alternatives	Trunk-Based Development is tailored to your specific organizational context	Alternatives may have larger community support
Doing Nothing	Trunk-Based Development creates measurable, compounding improvement	Status quo requires zero effort or change management
Consultant-Led Only	Trunk-Based Development builds internal capability that scales	Consultants bring external perspective and benchmarks
Tool-Only Solution	Trunk-Based Development combines process, culture, and measurement	Tools provide immediate automation without culture change
One-Time Project	Trunk-Based Development as ongoing practice delivers compounding returns	One-time projects have clear scope and end date

🔄

How It Works

Visual Framework Diagram

┌──────────────────────────────────────────────────────────┐ │ Trunk-Based Development Framework │ ├──────────────────────────────────────────────────────────┤ │ │ │ ┌──────────┐ ┌──────────┐ ┌──────────────┐ │ │ │ Assess │───▶│ Plan │───▶│ Execute │ │ │ │ (Where?) │ │ (What?) │ │ (How?) │ │ │ └──────────┘ └──────────┘ └──────┬───────┘ │ │ │ │ │ ┌──────▼───────┐ │ │ ◀──── Iterate ◀────────────│ Measure │ │ │ │ (Results?) │ │ │ └──────────────┘ │ │ │ │ 📊 Define success metrics upfront │ │ 💰 Quantify impact in financial terms │ │ 📈 Report progress to stakeholders quarterly │ │ 🎯 Continuous improvement cycle │ └──────────────────────────────────────────────────────────┘

🚫 Common Mistakes to Avoid

Implementing Trunk-Based Development without executive sponsorship

⚠️ Consequence: Initiatives stall when competing with feature work for resources.

✅ Fix: Secure VP+ sponsor who can protect budget and prioritize the initiative.

Treating Trunk-Based Development as a one-time project instead of ongoing practice

⚠️ Consequence: Initial improvements erode within 2-3 quarters without sustained effort.

✅ Fix: Embed into regular rituals: quarterly reviews, team OKRs, and reporting cadence.

Not measuring Trunk-Based Development baseline before starting

⚠️ Consequence: Cannot demonstrate improvement. ROI narrative impossible to build.

✅ Fix: Spend the first 2 weeks establishing baseline measurements before any changes.

Copying another company's Trunk-Based Development approach without adaptation

⚠️ Consequence: Context mismatch leads to poor results and wasted effort.

✅ Fix: Use frameworks as starting points. Adapt to your team size, stage, and culture.

🏆 Best Practices

✓

Start with a 90-day pilot of Trunk-Based Development in one team before rolling out

Impact: Validates approach, builds evidence, and creates internal champions.

✓

Measure and report Trunk-Based Development impact in financial terms to leadership

Impact: Ensures continued investment and executive support for the initiative.

✓

Create a Trunk-Based Development playbook documenting processes, tools, and decision frameworks

Impact: Enables consistency across teams and reduces onboarding time for new team members.

✓

Schedule quarterly Trunk-Based Development reviews with cross-functional stakeholders

Impact: Maintains momentum, surfaces issues early, and keeps the initiative visible.

✓

Invest in training and certification for Trunk-Based Development across the organization

Impact: Builds internal capability and reduces dependency on external consultants.

📊 Industry Benchmarks

How does your organization compare? Use these benchmarks to identify where you stand and where to invest.

Industry	Metric	Low	Median	Elite
Technology	Trunk-Based Development Adoption	Ad-hoc	Standardized	Optimized
Financial Services	Trunk-Based Development Maturity	Level 1-2	Level 3	Level 4-5
Healthcare	Trunk-Based Development Compliance	Reactive	Proactive	Predictive
E-Commerce	Trunk-Based Development ROI	<1x	2-3x	>5x

❓ Frequently Asked Questions

Is trunk-based development risky?

Counter-intuitively, it's less risky than long-lived branches. Small, frequent merges are easier to review, test, and roll back than large, infrequent merges. Feature flags handle incomplete features.

TBD vs GitFlow?

GitFlow works for infrequent releases. TBD works for continuous deployment. DORA research shows TBD teams deploy more frequently with lower failure rates.

🧠 Test Your Knowledge: Trunk-Based Development

Question 1 of 6

What is the first step in implementing Trunk-Based Development?

Need Expert Help?

Richard Ewing is a Product Economist and AI Capital Auditor. He helps companies translate technical complexity into financial clarity.

Book Advisory Call →

Keep exploring

guide