Position Type: Contract-to-hire or contract preferred; direct hire optional (candidate must own Mac required)
Hourly Pay: $25 - $30
Location: Remote (U.S.)
Minimum Years of Experience Required: 2
Role summary
Existing production iOS app with a prepared calculation protocol boundary. Integrate a licensed third-party native biomathematical library behind that boundary, map SDK I/O to app DTOs, dual-run against an in-house baseline, feature-flag cutover, and ship without rewriting product UI.
Technical context
|
Area |
Stack |
|
Platform |
iOS 17+, Swift 5.9+, SwiftUI |
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Architecture |
MVVM-ish + service layer (singletons + @EnvironmentObject) |
|
Persistence |
Core Data; Keychain for sensitive params |
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Integrations Tests Scale |
HealthKit, UserNotifications, BackgroundTasks, haptics XCTest unit/integration + UITests ~80 Swift files / ~18k LOC incl. tests |
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Process |
Conventional commits; PR to main; concurrency hygiene in progress (@MainActor, Swift 6–oriented) |
Architecture seam (already prepared):
SwiftUI Views
Services (data, HealthKit, notifications, personalization, monitor)
AlertnessEngine protocol ? integration point
Domain models + Core Data
Boundary already in place:
- Protocol: current state, forecast, optimize caffeine/dosing schedule, circulating level, related outputs
- Inputs/outputs use absolute Dates only at the boundary
- Single builder path: sleep + dose events + resolved subject profile - engine input
- Temporary in-house adapter implements the same protocol (dual-run baseline)
- DI provider swaps implementations without UI rewrites
- Planned doses are a real flag on events (not free-text parsing)
- Personalization traits resolved app-side and passed in; integrator does not own trait fitting unless contract expands
On-device only: no backend; computation and storage stay on device.
Responsibilities
- Package licensed lab library (SPM and/or XCFramework); pin versions; document upgrade path
- Implement protocol-conforming adapter; map lab SDK I/O ? app DTOs
- Lock unit/timebase/dose policy (see existing unit-policy docs); touchscreen vs hardware RT policy where relevant
- Build dual-run / golden regression harness vs in-house baseline; no silent behavior drift
- Feature-flag provider swap; document failure modes (missing sleep, bad inputs, SDK errors)
- Own release risk for incorrect predictions at the engine boundary; science/product sign-off on parity
Must-have
- Strong Swift and iOS (async/await, actors / @MainActor, working inside an existing SwiftUI codebase)
- Wrapping third-party native libraries (XCFramework / SPM), binary vs source integration, module/linker issues
- Defining and locking I/O contracts (timebases, units, dose schedules, absolute timestamps)
- Test discipline: dual-run, golden/regression tests, CI-friendly harnesses; no silent drift ? Clear async written communication; Mac development environment
Nice-to-have
- Sleep / circadian / caffeine PK-PD or biomathematical modeling exposure ? HealthKit, BackgroundTasks, local notification scheduling
- Scientific, clinical, or safety-critical app experience
- On-device performance profiling; numerical stability awareness
- Prior closed-source / licensed SDK integration under NDA
Strong Swift/iOS experience, SPM/XCFramework integration, defining I/O contracts, testing discipline; minimum 2 years experience and Mac development environment.
Key Responsibilities
- integrating library
- mapping dto
- running tests
Skills & Tools
iOS 17, Swift 5.9, SwiftUI, Core Data, Keychain, HealthKit, UserNotifications, BackgroundTasks, haptics, XCTest, SPM, XCFramework, CI
Job Details
- Category: Software Development
- Seniority: Entry Level
- Commitment: Contract, Full Time
- Workplace: Remote — United States
- Salary: USD 52,000 – 62,400 / year
- Languages: English
About LaunchCode
Builds health-related mobile applications integrating biomathematical engines and clinical workflows. — Industry: Information Technology