Zigzag Timetables
Client: Coastline Bus CompanyIntercity coaches · Accra to Takoradi
Coastline Bus Company depot, Kaneshie, Accra · Quiet, deliberate
Coastline Bus Company runs coaches between Accra and Takoradi. A contractor 'optimised' the timetable export, and now it comes out in zigzag rows and shuffled columns. Passengers keep missing buses.
Who you'll work with
Ada MensahYour lead
Engineering Lead
Dry, warm underneath, short sentences. Notices how you did. Never gushes.
Mr. Kobina Mensah
Route Planner, Coastline Bus
Precise, patient, owns three watches.
Tunde Bakare
Senior Developer
Friendly rival. Competitive banter, always generous in the end.
The client's system
Zigzag and grid
Rail fence with growing row counts, keyword columnar transposition, and the contractor's pipeline that hides a transposition inside encodings.
6 tickets in the sequence · every developer gets unique keys and tests · the rules come out in the tickets
Opens in
…- Pay / ticket
- 40–80
- Band
- 2,500+
- Scored tickets
- 6
- Your time
- 120h
0 devs on this contract
Performance bonus · top 10
+220 gems to 1st
- #1+220
- #2+150
- #3+110
- #4+44
- #5+44
- #6–10+44 each
Ship 3+ tickets for a +15 completion bonus.
The shortlist stays hidden until wrap-up. Only the first 6 tickets count.