OPEN-SOURCE PRODUCT ENGINEERING SYSTEM

Daily product work starts with business needs.Not technical wrangling.

Describe the outcome. The system handles state, security, persistence, failure recovery, testing, and delivery behind the scenes, so you can stay focused on what the product should do.

Quick start Explore the case studies Use with your AI agent

Inspect the technical system whenever you need it.

SEMANTIC TYPE SCALEClear hierarchy.Built to adapt.

Display / body / label

AaOne shared language

TYPED COMPONENTS

OverviewActivity

Enum-driven variants

SERVER CONTRACT

repository.list()

VERTICAL SLICETyped UIDomain serviceRepository adapter

REVIEWABLE EVIDENCEReady for review Desktop + mobile E2E + visual CI

SEMANTIC TOKENSOne source of truth.

SEMANTIC TYPE SCALEClear hierarchy.Built to adapt.

Display / body / label

AaOne shared language

TYPED COMPONENTS

OverviewActivity

Enum-driven variants

SERVER CONTRACT

repository.list()

VERTICAL SLICETyped UIDomain serviceRepository adapter

REVIEWABLE EVIDENCEReady for review Desktop + mobile E2E + visual CI

SEMANTIC TOKENSOne source of truth.

SEMANTIC TYPE SCALEClear hierarchy.Built to adapt.

Display / body / label

AaOne shared language

TYPED COMPONENTS

OverviewActivity

Enum-driven variants

SERVER CONTRACT

repository.list()

VERTICAL SLICETyped UIDomain serviceRepository adapter

REVIEWABLE EVIDENCEReady for review Desktop + mobile E2E + visual CI

SEMANTIC TOKENSOne source of truth.

LOCAL TYPE OVERRIDESLooks close.Until it doesn’t.

14px / 15px / 16px

AaFive one-off styles

ONE-OFF CONTROLS

OverviewActivity

Hardcoded state

COMPONENT FETCH

fetch('/api')

TANGLED OWNERSHIPPage + fetch + policyShared mutable stateDirect table write

HOPE IT WORKSManual spot check Desktop + mobile E2E + visual CI

HEX VALUES EVERYWHEREClose enough?

LOCAL TYPE OVERRIDESLooks close.Until it doesn’t.

14px / 15px / 16px

AaFive one-off styles

ONE-OFF CONTROLS

OverviewActivity

Hardcoded state

COMPONENT FETCH

fetch('/api')

TANGLED OWNERSHIPPage + fetch + policyShared mutable stateDirect table write

HOPE IT WORKSManual spot check Desktop + mobile E2E + visual CI

HEX VALUES EVERYWHEREClose enough?

LOCAL TYPE OVERRIDESLooks close.Until it doesn’t.

14px / 15px / 16px

AaFive one-off styles

ONE-OFF CONTROLS

OverviewActivity

Hardcoded state

COMPONENT FETCH

fetch('/api')

TANGLED OWNERSHIPPage + fetch + policyShared mutable stateDirect table write

HOPE IT WORKSManual spot check Desktop + mobile E2E + visual CI

HEX VALUES EVERYWHEREClose enough?

REFERENCE
STACKNext.jsKotlin / AndroidSwift / iOSSupabaseTanStack Query

BUSINESS NEEDS IN PRACTICE

Make the business decision. The system handles the rest.

Choose the next business action: decide what can ship or move a customer toward value. State, policy, persistence, failure recovery, and verification stay behind the workflow.

Case study 01Checkpoint OS · release operations

Release / mobile checkout

Mobile checkout82%

Design QA E2E• Security

Release Readiness

Decide what can ship, resolve what is blocked, and move a release forward. Gates, approvals, concurrency, and rollback stay behind the workflow.

Decide what can ship

Case study 02Clarity System · customer operations

74health

Customer journeyNorthstar Health3 of 4 milestones

Onboarding Operations

See which customer needs attention and move each account toward value. Health scoring, tenant safety, persistence, and recovery stay behind the workflow.

Move customers toward value

Case study 03Relay Field System · native operations

010203

CRITICAL · 10:35Cedar Ridge Shelter48 water cases · en routeSaved for offline use

Field Relay

Move essential supplies through weak connectivity. Assignment, proof, offline sync, authorization, and conflict recovery stay behind the route.

Complete the next stop

TECHNICAL DECISIONS, ALREADY MADE

Stay focused on what the product should do.

Stable contracts keep state, security, persistence, and failure recovery out of the daily product conversation while leaving every decision open to inspection.

Tour the design system Go behind the scenes

01UI stateLocal interaction only 02Server cacheQuery and mutation ownership 03Domain servicePolicy and authorization 04RepositorySupabase or deterministic demo

PORTABLE SKILLS

Call the same workflow from any AI agent.

Install one conductor and focused skills for each stage. Progressive references keep requests concise while preserving depth.

01Architecture design 02Race-condition debugging 03Decoupled state management 04Code review 05Design polish 06Design systems 07Designs-to-app delivery 08Full-stack vertical slices 09Manual UI QA 10PR review and CI 11Responsive and security review 12Expo native delivery

Start with the outcome.

Bring the business need. The system supplies the implementation path, safeguards, tests, and evidence.

Start with the workflow View source