Why it exists
A countdown tells you time is running out. A useful plan also tells you which task to work on and what happens if you finish it early.
Portfolio / CASE STUDY
Public focus timer
Doomsday Clock.
A deadline-driven focus timer that divides remaining time across weighted tasks and recovers a guest session after reload.
MY ROLE
Independent web product design and development
What I built
I built a timer and task lane around an explicit state engine. Guest sessions persist locally, and optional sign-in and AI planning can extend the workflow.
Project in view
Engineering decisions
Model the clock as a state engine
A pure timer module handles pause, resume, early completion, time banking, and overtime. Tests exercise time-dependent transitions with controlled inputs.
Recover guest sessions locally
Serialization and browser storage let the timer recover a plan after reload. The guest path can run with the optional integrations disconnected.
Scope cloud plans to the owner
Signed-in plan routes are separated from the guest timer. Security tests exercise access across accounts.
Capabilities in practice
- State machine design
- Deterministic tests
- Local persistence
- Owner-scoped APIs
Status & scope
The guest timer is runnable from source. Cloud plans and AI providers require their own setup.