Sebastian Selling
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Sebastian Selling · @sebastian

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Design engineer, AI-native

Founder-operator who ships full product surfaces — web and native — with strong taste, systems thinking, and agent-augmented execution. Not specs handoff: own the loop from positioning to deploy.

What I build

Primary focus is iSPECT — a massive migration and refactor from legacy iOS/iPad inspection software into a modern Expo monorepo. Ongoing work: field workflows, defect taxonomy and editor, orders, multi-tenant workspaces, and production parity with the iPad app in the field.

  • HerediumSwedish BRF screening and underwriting (PLG). Side project; much lower activity. Pulls building-risk signal from iSPECT when available.
  • minibrf.seLightweight BRF tooling. Side project; much lower activity.

Breadth

  • Product and GTMvision, ICP, marketing copy, i18n, PLG billing
  • WebNext.js App Router, shadcn, motion microinteractions, dashboard and marketing
  • BackendSupabase RLS, migrations, Realtime, pg_cron workers; minimal third-party surface
  • AI and dataFirecrawl pipelines, structured LLM extraction, credit-metered async jobs
  • Native mobileExpo Router, iPad field UI, legacy iOS parity, HIG review
  • Design systemstokens, concentric radius, reduced-motion, in-code systems not Figma handoff
  • Agent opsskills library, AGENTS.md memory, plan → implement → review → ship

Depth

  • Design engineering as craftconcentric radius, tabular nums, staggered motion, no transition: all
  • Complex workflow UXmulti-pane workbenches, progressive disclosure, column layouts, export paths
  • AI-native buildingstructured agent pipelines, durable workspace memory, production velocity
  • Architectural judgmentSupabase-first, lock down RPCs, Realtime over fake loading steps
  • Domain depthSwedish BRF underwriting, inspection defect taxonomy, multi-tenant workspaces

How I work

  • Plan-first, execute fullyscoped todos, build fixes before ship
  • High bardesign review and code review on the same diff
  • Own the narrativeproduct vision and copy, not just components
  • Expert-to-experttradeoffs over ceremony

Activity

Tokens

3.2B tokens

May 20Today

Agents

373 agents

Local (358)Cloud (15)
May 20Today

Models

  1. 1

    Composer 2.5

  2. 2

    GPT-5.5

  3. 3

    Claude Opus 4.8