One readable signal
Compress complexity without hiding the reason behind it.
Sentinel combines property context, historical exposure, and forecast severity into one readable Home Vulnerability Score.
Sentinel
Built in 48 hours.
Designed to replace gut feeling with evidence.
Sentinel turns property context, weather history, and hazard signals into a clear vulnerability score and prioritized maintenance actions for homeowners.
Sentinel product composition / source pending
48:00Working iOS prototype
The brief
2025 Fluxathon · In collaboration with Google
Build a data-driven iOS app using the Weather API.
With 48 hours, the team focused on one homeowner decision Sentinel could make clearer: what has this property been through, and what should happen next?
The idea
We manage our biggest asset based on a gut feeling.
“Is it time to replace the roof?”
A 20-year roof is only 20 years on paper.
Sentinel reframes home maintenance around what a property has actually experienced. Instead of waiting for visible damage, homeowners can see risk, understand why it matters, and prioritize preventative work.
20 yearsGeneric expected lifespan
vs.15 yearsProperty-specific true lifespan, shaped by weather and exposure
Product walkthrough
Home vulnerability score
58Home Vulnerability Score01 / Home vulnerability score
True lifespan
A roof is not just an age. It is a history.
The historical timeline shows what the property has actually experienced, making maintenance priority more useful than a generic lifespan estimate.
Risk to action
A signal matters only if it leads to the next step.
Sentinel turns risk into prioritized maintenance actions, helping homeowners move from uncertainty to a concrete plan.
Product walkthrough
01 / Home vulnerability score
Home vulnerability score
58Home Vulnerability ScoreOne readable signal
Compress complexity without hiding the reason behind it.
Sentinel combines property context, historical exposure, and forecast severity into one readable Home Vulnerability Score.
02 / Historical timeline
Historical timeline
Historical Timeline
True lifespan
A roof is not just an age. It is a history.
The historical timeline shows what the property has actually experienced, making maintenance priority more useful than a generic lifespan estimate.
03 / Action plan
Action plan
Action Plan
Risk to action
A signal matters only if it leads to the next step.
Sentinel turns risk into prioritized maintenance actions, helping homeowners move from uncertainty to a concrete plan.
Try the prototype
Try Sentinel
Explore the same focused product logic in a local browser demo: property context becomes risk, risk becomes a plan, and completed work updates the experience.
This is a deterministic web adaptation of the SwiftUI prototype. Insurance values are illustrative prototype estimates.
Home Vulnerability Score
Risk Breakdown
⌂Property Resilience52
◷Historical Exposure68
!Forecast Severity64
Active Weather Alerts
1Rapid code prototyping
Built against real states, not static screens.
The prototype was built directly in Xcode using SwiftUI. Working in the running product made it possible to shape information states, score outputs, and task flows with implementation constraints in view.
01 / Weather data
The data had to make a decision clearer.
Weather API inputs were translated into property-specific hazard context instead of being presented as raw conditions.
Weather API service / code excerpt / source pending
02 / Product model
The UX needed a model behind it.
A compact assessment model kept the score, its contributing factors, and recommended actions connected.
struct HazardAssessment {
let score: Int
let factors: [RiskFactor]
let recommendedActions: [MaintenanceTask]
}03 / Running state
The same logic had to survive the interface.
Testing a real HVS state made the relationship between data, product rules, and presentation concrete.
Console / runtime output / source pending
Data → Product logic → UI state
Home vulnerability score
58Home Vulnerability ScoreOutcome
48 hours.
One working iOS prototype.
One Fluxathon win.
Winner
2025 Fluxathon
Sentinel won the hackathon after the team moved from a broad climate-risk problem to a focused product that connected property history, risk, and preventative action in one working experience.
Pitch stage or final Sentinel product composition / source pending
Reflection
In 48 hours, clarity mattered more than completeness.
Sentinel reinforced how much engineering fluency can improve product design. Shaping product logic close to the SwiftUI build meant priorities and flows could be tested against real states instead of static screens.
I want to keep working at that boundary: defining products clearly enough that design and engineering can move as one.