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Blog · AlterSquare

Blog

Notes from the build.

Field notes on shipping AI-native systems with human engineering judgement: architecture, modernisation, automation, and the tradeoffs in between.

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Blog·17 Jun 2026·10 min read

Antigravity vs Cursor vs Claude Code: How the Three Agentic Coding Tools Compare for Production Work in 2026

Agentic coding tools force a tradeoff: editor-first control, terminal-led safety, or orchestration-driven autonomy.

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Blog·16 Jun 2026·12 min read

OpenCode vs Claude Code in 2026: What Changed After Both Shipped Major Releases

Control beats convenience: open, local-capable coding agents suit regulated or complex projects, while vendor-locked agents favor quick MVPs.

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Blog·16 Jun 2026·13 min read

Zero-Downtime Modernisation: The Deployment Architecture That Makes It Actually Possible

Zero-downtime migration blueprint: parallel blue/green stacks, expand→dual-write DB changes, staged traffic shifts, and rollback rules.

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Blog·15 Jun 2026·15 min read

When Incremental Modernisation Is the Wrong Call: The Case for Bounded Rewrites

Replace one risky subsystem instead of endless patches: use feature flags, shadowing, canaries, and strict rollback rules.

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Blog·13 Jun 2026·12 min read

Feature Flag Rollout for Legacy Systems: The Implementation Pattern That Lets You Ship Without Freezing

Split deployment from exposure with feature flags and a dispatcher-ramp traffic safely, monitor per-path metrics, and retire flags quickly.

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Blog·12 Jun 2026·17 min read

Dependency Graph Mapping Before a Modernisation: Why It Always Changes the Timeline Estimate

Combine static and runtime dependency mapping to uncover hidden couplings, prioritize modules, and create realistic modernization timelines.

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Blog·10 Jun 2026·18 min read

The First-Week Legacy Audit: Exactly What We Map Before Writing a Single Line of Modernisation Code

Map stakeholders, runtime, code, routing, and tests in week one to expose hidden dependencies and lock a focused 90-day modernization scope.

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Blog·09 Jun 2026·20 min read

Strangler Fig in Practice: The Mistakes Teams Make in the First Three Months That Undo the Whole Plan

Avoid Strangler Fig failures in the first 90 days: practical milestones, routing and boundary fixes, feature-flag hygiene, observability, and ownership.

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Blog·08 Jun 2026·16 min read

AI Prompts for Code Review: How to Get Genuinely Useful Feedback From an LLM on Someone Else’s Code

Use context-rich prompts, focused roles, and structured output to get actionable AI feedback on PR diffs, security, performance, and logic.

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Blog·06 Jun 2026·20 min read

AI Prompts for SaaS Product Managers: From Feature Spec to Edge Case Coverage in One Workflow

An 8-step AI prompt workflow that turns rough ideas into structured PRDs, user stories, edge-case checks, and prioritized features.

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Blog·05 Jun 2026·20 min read

AI Prompts for Debugging Legacy Code: Getting Useful Output From Codebases an LLM Has Never Seen

Use precise AI prompts to map, test, and safely fix legacy code-surface assumptions, generate characterization tests, and minimize risk.

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Blog·03 Jun 2026·27 min read

AI Prompts for Frontend Engineers: 9 Copy-Paste Prompts for the Work That Kills Your Afternoon

Nine copy‑paste AI prompts to debug React, migrate components, write tests, boost performance, and improve accessibility.

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