https://hashitosystem-web.web.app/en/blog/ A tech blog on web development, algorithms, QR/barcodes, and Claude Code from Hashito System Inc. en Sun, 28 Jun 2026 00:00:00 +0900 https://hashitosystem-web.web.app/en/blog/barcode-specifications/ https://hashitosystem-web.web.app/en/blog/barcode-specifications/ Fri, 26 Jun 2026 00:00:00 +0900 A guide to the characteristics and structure of EAN/JAN, UPC, CODE39, CODE128, ITF and Codabar, and how check digits work, explained alongside real generated samples. https://hashitosystem-web.web.app/en/blog/qr-code-specifications/ https://hashitosystem-web.web.app/en/blog/qr-code-specifications/ Fri, 26 Jun 2026 00:00:00 +0900 A guide to QR Code specifications, including versions, data capacity, encoding modes, error correction, structure, and masking, illustrated with real generated samples. https://hashitosystem-web.web.app/en/blog/claude-code-armin-ronacher/ https://hashitosystem-web.web.app/en/blog/claude-code-armin-ronacher/ Thu, 25 Jun 2026 00:00:00 +0900 claude-yolo with Docker, logging practices, agent-readable code design, and CLI over MCP. Armin Ronacher's approach explained with quotes from the original posts. https://hashitosystem-web.web.app/en/blog/claude-code-boris-cherny/ https://hashitosystem-web.web.app/en/blog/claude-code-boris-cherny/ Thu, 25 Jun 2026 00:00:00 +0900 Running Claudes in parallel, the habit of writing mistakes into CLAUDE.md, /commit-push-pr, the move to auto mode, 'verification 2-3x's the quality'. The creator's own practices, explained with sources. https://hashitosystem-web.web.app/en/blog/claude-code-documentation/ https://hashitosystem-web.web.app/en/blog/claude-code-documentation/ Thu, 25 Jun 2026 00:00:00 +0900 Based on our review of English-language sources, this article explains how to create, sync, and manage documentation with Claude Code. https://hashitosystem-web.web.app/en/blog/claude-code-how-top-engineers-use/ https://hashitosystem-web.web.app/en/blog/claude-code-how-top-engineers-use/ Thu, 25 Jun 2026 00:00:00 +0900 A look at how leading engineers around the world use Claude Code in practice, with references to the original articles. https://hashitosystem-web.web.app/en/blog/claude-code-mitchell-hashimoto/ https://hashitosystem-web.web.app/en/blog/claude-code-mitchell-hashimoto/ Thu, 25 Jun 2026 00:00:00 +0900 Delegating research, harness engineering, real examples from Ghostty, and the warning he calls 'agent psychosis.' We explain Mitchell Hashimoto's practice with quotes from his own blog. https://hashitosystem-web.web.app/en/blog/claude-code-project-workflow/ https://hashitosystem-web.web.app/en/blog/claude-code-project-workflow/ Thu, 25 Jun 2026 00:00:00 +0900 Based on research into English-language blogs, this article explains a project workflow for planning, implementing and verifying work with Claude Code. https://hashitosystem-web.web.app/en/blog/claude-code-simon-willison/ https://hashitosystem-web.web.app/en/blog/claude-code-simon-willison/ Thu, 25 Jun 2026 00:00:00 +0900 'Designing agentic loops', YOLO mode and sandboxes, the $5 disposable Fly.io organization. We explain Simon Willison's practices with quotes from the original articles. https://hashitosystem-web.web.app/en/blog/claude-code-team-collaboration/ https://hashitosystem-web.web.app/en/blog/claude-code-team-collaboration/ Thu, 25 Jun 2026 00:00:00 +0900 Based on a review of English-language blogs, this article explains how to build team collaboration, knowledge sharing, and communication around Claude Code. https://hashitosystem-web.web.app/en/blog/claude-code-test-scenarios/ https://hashitosystem-web.web.app/en/blog/claude-code-test-scenarios/ Thu, 25 Jun 2026 00:00:00 +0900 Based on research into English-language blogs, this article explains how to build test strategies, verification loops, TDD, and E2E verification with Claude Code. https://hashitosystem-web.web.app/en/blog/qr-code-error-correction/ https://hashitosystem-web.web.app/en/blog/qr-code-error-correction/ Thu, 25 Jun 2026 00:00:00 +0900 Through error correction levels (L/M/Q/H) and Reed-Solomon codes, we explain how a QR code still reads even when part of it is missing. https://hashitosystem-web.web.app/en/blog/sorting-algorithms-visualized/ https://hashitosystem-web.web.app/en/blog/sorting-algorithms-visualized/ Thu, 25 Jun 2026 00:00:00 +0900 An overview of how representative sorting algorithms work and their time complexity, with guidance on choosing the right one for the job. https://hashitosystem-web.web.app/en/blog/web-performance-core-web-vitals/ https://hashitosystem-web.web.app/en/blog/web-performance-core-web-vitals/ Thu, 25 Jun 2026 00:00:00 +0900 A practical guide to improving page speed and user experience around the three metrics LCP, INP, and CLS — from measurement to implementation.