How We Build Software 100% with Claude Code
A deep dive into our Claude Code workflow that powers every project. Learn how we use Anthropic's agentic coding tool to achieve 3-5x faster delivery while maintaining enterprise-grade quality.
Introduction
At QuantFlow, we don't just use AI to assist our coding—we've built our entire development workflow around Claude Code. Every feature, every bug fix, every refactor runs through Anthropic's agentic coding tool. This isn't about replacing developers; it's about amplifying what two senior engineers can accomplish.
The result? We consistently deliver projects 3-5x faster than traditional agencies while maintaining the code quality our clients expect. This article explains exactly how we do it.
Why Claude Code Over Other AI Tools
We evaluated every major AI coding tool before committing to Claude Code. Here's why it won:
Terminal-native architecture. Claude Code lives in your terminal, not a separate chat window. It takes direct action—editing files, running commands, creating commits. This eliminates the copy-paste friction that kills productivity with other AI tools.
200K context window. Claude can hold entire codebases in context. When we ask it to refactor a feature that spans 15 files, it understands the full picture—not just the file you're looking at.
Agentic workflows. Unlike autocomplete-focused tools, Claude Code plans and executes multi-step changes. It doesn't just suggest code; it implements features, runs tests, and handles the git workflow.
MCP integrations. Through the Model Context Protocol, Claude Code connects to our entire toolchain—Linear for tickets, Slack for communication, GitHub for PRs. One interface to rule them all.
Our Daily Development Workflow
Here's what a typical development session looks like at QuantFlow:
Morning: Context Loading. We start each session by loading our Navigator documentation system. Claude reads the project architecture, current sprint focus, and any relevant SOPs. This takes about 30 seconds and ensures Claude has full context.
Task Intake: Linear Integration. We pull assigned tickets directly from Linear using MCP. Claude reads the requirements, asks clarifying questions, and breaks down the work into actionable sub-tasks using TodoWrite.
Implementation: Parallel Execution. For complex features, we run multiple Claude Code sessions in parallel—one handling frontend components, another working on API endpoints, a third writing tests. Git worktrees keep everything isolated until merge.
Review: Checkpoint System. Claude's checkpoint system automatically saves code state before each change. If something breaks, we tap Esc twice to rewind. This encourages ambitious refactoring without fear.
Delivery: Git Automation. Once implementation is complete, Claude handles the entire git workflow—staging changes, writing commit messages that follow our conventions, and creating PRs with proper descriptions.
Our Custom Agent System
We've built a library of specialized agents that handle different aspects of development:
Full-Stack Engineer Agent. Our workhorse agent. It understands our Next.js 15 architecture, SSR-first principles, and TailwindCSS patterns. When it writes code, it follows our standards automatically.
SEO Specialist Agent. Handles metadata, schema markup, sitemap generation, and content optimization. Every page gets proper SEO treatment without manual checklist reviews.
QA Engineer Agent. Runs comprehensive testing—functional, performance, accessibility, cross-browser. Catches issues before they reach production.
Linear PM Agent. Manages ticket decomposition, progress updates, and sprint planning. Keeps our Linear board in sync with actual development status.
Each agent has carefully crafted system prompts with our coding standards, forbidden actions, and quality expectations baked in. They're version-controlled alongside our code.
Real Numbers: Time and Cost
Let's talk specifics. According to Anthropic's data, the average Claude Code cost is $6 per developer per day, with 90% of users staying below $12/day. Our monthly Claude API costs run $100-200 per developer.
What do we get for that investment?
Feature velocity. A feature that would take a traditional team 3-5 days typically ships in 1 day with our workflow. The 3-5x multiplier isn't marketing—it's what we consistently deliver.
Code quality. Claude doesn't get tired at 4pm. It doesn't skip tests because it's Friday. Every commit gets the same attention to detail.
Documentation. Our codebase has better documentation than most because Claude writes it as part of the development process. JSDoc comments, README updates, and architecture docs are generated alongside the code.
Consistency. With our agent system, code follows the same patterns whether it's written Monday morning or Friday evening. No style drift, no architectural inconsistencies.
Why We're Transparent About This
Some agencies hide their AI usage. We lead with it. Here's why:
It's our competitive advantage. We're not ashamed of our tools—we're proud of the workflow we've built. Clients benefit from faster delivery and lower costs. Why hide that?
Human judgment still matters. Claude Code is powerful, but it's not autonomous. We review every change, make architectural decisions, and handle client communication. The AI amplifies our capabilities; it doesn't replace our expertise.
The future is here. Every development team will work this way eventually. We'd rather be early and experienced than late and learning.
Getting Started with Claude Code
If you're interested in adopting Claude Code for your team, here's our advice:
Start with the basics—install Claude Code, learn the core commands, get comfortable with the terminal workflow. Then gradually build your custom agents and MCP integrations. For a technical deep-dive into configuration, check out our Claude Code setup guide.
Or, if you'd rather skip the learning curve, work with a team that's already figured it out. That's what we offer at QuantFlow—Claude Code expertise applied to your project, with the speed and quality that comes from a refined workflow.
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