Evolution of Spec-driven development: from «Plan Mode» to formal specifications and OpenSpec [ukr]
This talk is about taming AI: the journey from a simple Plan Mode in Cursor/Claude to structured specification systems. We'll break down why GitHub Spec Kit turned out to be too heavyweight, how ADR (Architecture Decision Records) helps agents retain context across sessions, and why OpenSpec by Y Combinator (Fission-AI, W26) became our sweet spot. The central thesis: code quality on output equals specification quality on input. Together we'll reflect on the transformation of the developer's role — from "coder" to "spec architect."
Vlad Yermolin
Solution Lead at Master of Code Global
- Career switcher (2019): from the maritime industry to IT; currently Solution Lead at Master of Code Global, Kyiv
- Went from frontend developer to solutions architect — over 5+ years at a service company, he shipped everything from a mini-Instagram for an NBA team to custom multi-agent AI flows
- Specializes in AI agent architecture, spec-driven development, and building documentation systems that AI understands on the first try
- Mentor in several frontend bootcamp cohorts, including a React course at Master of Code Global
- Long-time FwDays attendee — taking the stage for the first time after years in the audience
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