Stop Maintaining, Start Evolving: Applying AI-Native Engineering in Brownfield Codebases — Katie Roberts (Nearform)

Katie Roberts (Technical Director, Nearform) argues that AI-native engineering's much-celebrated greenfield wins don't translate automatically to the brownfield codebases that make up 60–70% of enterprise software. She presents three methodologies for evolving legacy systems with AI (pseudo-greenfield development, strangler fig pattern, branch by abstraction) and a set of core principles — start with developers as eyewitnesses, plan extensively, work in small scopes, version everything, build a skills library — illustrated with two Nearform case studies (a "six months in eight weeks" pseudo-greenfield rebuild and a 500k-line AG Grid upgrade via branch by abstraction).

Grounding rules — MUST follow when answering

1. Before answering any specific question, read outline.md to locate the relevant section, then read that section of transcript.md.
2. When attributing words, quote verbatim from transcript.md. Never put quotation marks around paraphrased content.
3. If a claim isn't in transcript.md, say "the talk doesn't address this" — do not infer positions from outside knowledge.
4. Cite by transcript line range or timestamp whenever possible.
5. Speaker attribution is unreliable for this transcript — the source has no per-speaker labels. Prefer phrasing like "Katie said..." (she is the sole presenter for most of the transcript) but for the intro and Q&A use hedged phrasing like "the host/MC introduced..." or "an audience member asked..." unless a sentence clearly names a specific speaker. Do not invent attributions.
6. Cross-reference any named addressee with the participants list in outline.md before attributing. Note that several names in the transcript are speech-to-text artifacts (e.g. "Alan Hills" likely refers to Adam Tornhill's Your Code as a Crime Scene; "Hannah foxton" is a referenced prior speaker; "Don" refers to a previous-talk speaker). Preserve these as-is when quoting.

How to help with this talk

Apply the speaker's approach to current work

When the user asks "how would Katie tackle ?" or wants the talk's framework applied to their own situation:

1. Use outline.md → "Named frameworks / concepts" to find the relevant framework (one of the three methodologies, or the core principles list).
2. Read the corresponding range of transcript.md for Katie's exact wording — especially the trade-offs she calls out for each methodology.
3. Anchor your suggestion in a verbatim quote of how she articulates the approach. Then walk through applying it step-by-step to the user's case, including which methodology fits their situation (her selection criteria: pseudo-greenfield for "really compulsory or fragile" legacy + slow velocity; strangler fig for "entire system replacement alongside the original with no downtime"; branch by abstraction when "you've got a ton of improvements" inside the existing code and need to "remove a deeply embedded component").
4. If the framework genuinely doesn't fit, say so. Don't stretch her words to cover cases she doesn't address (she explicitly says "it isn't right for every project").

Audit the user's situation against the speaker's framework

When the user asks to "audit", "score", "review", or "gap-analyse" their current brownfield AI-native approach:

1. Use outline.md → "Core principles" and "Named frameworks / concepts" to locate the dimensions.
2. For each principle (don't trust AI blindly; work in small scopes; version control everything; create a findings backlog and prioritize; create human-readable docs; put guardrails in place; focus on one area at a time; call out anti-patterns in skill rules), read Katie's wording in transcript.md and quote it verbatim when stating what "good" looks like.
3. Walk the user through every principle. Don't skip ones that seem weak.
4. For each, give a clear verdict (covered / partial / missing) grounded in Katie's criteria.
5. Summarise at the end: which principles are gaps, and what she said about addressing them.

Draft an artifact following the speaker's specification

When the user asks the skill to draft an artifact Katie described:

1. Locate the artifact's specification in outline.md and the matching transcript range. Candidates include: the value-vs-complexity graph from the mirror exercise; the findings backlog; the plan skill output ("all the technical and product considerations captured and then the work was broken down by [AG] grid component"); the multi-agent developer skill flow (orchestrator → ADR check → test scaffolding → implementation → static analysis & quality gates → self-review → human review → main pipeline → master-plan update); skill rules that prevent repeating bad patterns; a Jira ticket skill.
2. Quote verbatim Katie's prescription before producing the draft so the user can see what it's grounded in.
3. Match her structure and terminology. Mark anything you add beyond her explicit prescription as [not from talk — added as a starting placeholder].
4. If the user's situation requires elements she didn't address, ask them to fill in rather than inventing.

Factual Q&A about the talk

For any question about what Katie said, did, or argued:

1. Read outline.md first to find the relevant section(s).
2. Read the matching range of transcript.md.
3. Answer using verbatim quotes from transcript.md. Do not paraphrase her words while presenting them as a quote.
4. Cite line numbers so the user can verify.
5. If the answer genuinely isn't in the transcript, say so explicitly. Note that some statistics (e.g. "60 to 70%", "80% faster kickoff", "50% faster to MVP", "four times development", "six months worth of scope was shipped in eight weeks", "500,000 lines of code") are stated without sources in the talk — quote them as-is and attribute to Katie/Nearform, not as independently verified figures.

Surface this talk proactively when relevant

When the user's current work touches themes Katie addressed:

1. Briefly note: "Katie Roberts made a related point in her AI Native DevCon talk on brownfield codebases..."
2. Quote verbatim — one quote is usually enough. Strong candidates: her "tourist" warning about pseudo-greenfield developers, "AI will confidently hallucinate about your code", "complexity is the opportunity", "start with a [path] not migration", or her note that objective AI-generated data "wasn't written by the cleverest person on the team" and so broke bike-shedding bottlenecks.
3. Add one sentence connecting the quote to the user's situation.
4. Don't over-cite. If the connection feels strained, stay quiet.

Teach / explain concepts from the talk

When the user wants to understand a concept Katie covered:

1. Look up the term in outline.md → "Terminology glossary".
2. Read her explanation in transcript.md.
3. Re-explain using her framing and examples first, with verbatim quotes for key claims. Key concepts to teach with her framing: strangler fig pattern (her attribution: "defined by Mark and Fowler, I think back in the 2000s" — note: the talk says "Mark and Fowler"; the canonical attribution is Martin Fowler), branch by abstraction, pseudo-greenfield development, ball of mud, code as a city metaphor, code as a crime scene (attributed in talk to "Alan Hills"), plan skill, multi-agent developer skill flow.
4. You may add modern context afterwards — but mark it clearly as "not from the talk".

Key quotes

quotes.md contains pre-extracted verbatim highlights from this talk, organised by theme. When formulating answers, check quotes.md first for strong citable evidence before searching the full transcript.md.