The Bottleneck Moved.

Platform Engineering When AI Writes the Code — Guilherme (Gui) Silva

▶ Open the slides use ← → to move

Every number and quote in the talk, with its source. All published in 2026. Company posts are self-reported — read them as “what they did”, not as proof.

Everyone uses it, few trust it Slide 2

• Stack Overflow Developer Survey 2026 — AIsurvey Stack Overflow · 30,903 responses · collected Jun–Aug 2026 73% of AI coding-tool users use them daily; 6.6% trust AI for important work decisions; 48% trust it when they can easily verify the output.

The volume is real Slide 5

• State of AI Impact in Engineering: Q3 Reportvendor DX · Oct 2026 · 500+ engineering organizations Median weekly PRs per developer 1.43 → 2.51 (+75.5%), Q4 2025 → Q3 2026.
• Octoverse: Commits, pushes reach new highs in 2026 as developers build with agentsvendor GitHub · 28 Oct 2026 Merged pull requests more than tripled to 1.3 billion; by September 2026, 40%+ of PRs started with an agent's first draft (17% in March).

The bottleneck moved Slides 6–7

• AI Changed How Spotify Builds. What We Learned (and Fixed) About Quality at Higher Velocity Spotify Engineering · Tyson Singer · 16 Sep 2026 “AI increased the capacity to produce change. The next constraint became our ability to verify it.”
• AI Engineering Report 2026: The Acceleration Whiplashvendor Faros AI · 12 Apr 2026 · 22,000 developers, 4,000+ teams Median time in review up 441.5% from lowest to highest AI adoption.
• The ROI of AI-assisted Software Development (v2026.1) DORA / Google Cloud · Apr 2026 AI volume can end up “overwhelming existing deployment pipelines and manual review gates”.
• When AI builds itself Anthropic · 2026 “Human code review has become a new bottleneck.”

The platform's new job Slides 8–10

• Guardrails, not gatesopinion CNCF blog · Koray Oksay · Oct 2026 “The platform team, which was created specifically to remove bottlenecks, has become one.”
• Many SWE-bench-Passing PRs Would Not Be Merged into Mainresearch METR · 10 Mar 2026 Roughly half of test-passing AI patches would not be merged by maintainers.
• “every mistake and bad pattern … needs to turn into a constraint” Lauren Tan · X · 12 Oct 2026

The verification loop, step by step Slides 11–18

• GitHub Agentic Workflows are now in technical preview GitHub Changelog · 13 Feb 2026 · step 1, identity Read-only permissions by default; writes only through pre-approved “safe outputs”.
• How we contain Claude across products Anthropic · May 2026 · steps 1–2 Users approved about 93% of permission prompts — clicking “yes” isn't a control.
• Minions: Stripe's one-shot, end-to-end coding agents · Part 2 Stripe · Feb 2026 · steps 2, 5, 6 One isolated devbox per task; scoped tools; at most two CI rounds, then back to a human.
• Sandboxing Untrusted AI Agents at Scale Google Open Source · 5 Nov 2026 · step 2 Agent Substrate and gVisor donated to the CNCF; containers share the host kernel.
• Using AI to Delete Code: Agentic Tech Debt Cleanup at Uber Uber · 20 Oct 2026 · step 3 A change “can pass CI and still be wrong”; a validation gate before any human sees it.
• Building an agentic harness that outlasts the model Shopify · Jul 2026 · step 3 “Tests are the oracle.”
• Trust but verify; or, the correctness ratchet Niko Matsakis · 30 Oct 2026 · step 3
• Orchestrating AI Code Review at scale Cloudflare · 20 Apr 2026 · step 4 Every merge request sorted into three risk tiers.
• Speeding up code review with small-change Will Larson · 17 Oct 2026 · step 4
• The AI engineering stack we built internally Cloudflare · 20 Apr 2026 · step 5 AGENTS.md across ~3,900 repos.
• Evaluating AGENTS.mdresearch ETH Zurich · ICLR 2026 · step 5 Long, generic context files don't help; keep them short and test them.
• Catching Bugs Before They Land: JiTTesting Meta · 29 Oct 2026 · step 7
• Argo Rollouts · Flagger CNCF projects · step 7 Canary releases with automatic rollback on Kubernetes.

Measure it, and does it work? Slides 19–20

• DORA metrics guide DORA · Jan 2026
• How the Claude Code team does code review Anthropic · 15 Oct 2026 2× merged PRs, −40% reverts.
• How Atlassian cut PR cycle time by 45% with AI code reviewsvendor Atlassian · 28 Jan 2026
• Spotify, Cloudflare and Meta — see above.

Try it Open source

• agent-pr-gate Guilherme Silva A GitHub Action that gates agent-written pull requests on risk tier, evidence and review rounds.