fn(args, deps) — Bringing Order to Chaos Without Breaking Anything

There’s a major disconnect in AI-assisted development right now. Most of the conversation assumes you’re building something new, or working from the kind of clean, stable foundation that barely exists in real engineering teams.

The reality is that most engineering teams live in legacy systems under high load, with god classes, global singletons, and console.log as observability. The kind of code where every change is a gamble.

This post shows what happens when you apply fn(args, deps) and autotel to those codebases. fn(args, deps) creates the seam for safe change; production telemetry captures the behavioural record that survives when every other spec has decayed.

To prove the point, we’ll do this in plain JavaScript, not TypeScript.

Data-Driven vs Assumptions : Why Engineers Should Take a Doctor's Approach

Engineers are responsible for designing and building complex systems that are expected to perform optimally under different conditions. However, without a deep understanding of how these systems behave, they risk making assumptions that can result in inefficiencies or even system failures.

In this post, we'll discuss why understanding a system like a doctor helping a patient is essential for engineers and by taking a proactive and data-driven approach, engineers can ensure that their systems are performing optimally and can make informed decisions that result in improved performance and reliability.