← Interview Prep Synthesized.io · Core Data Engine

Kotlin Playground

12 hands-on coding tasks — write Kotlin in the browser, run real tests, build muscle memory for the Synthesized.io interview.

0 / 12 solved
Day 1
Basics — masking and graph fundamentals
Task 01unsolved

Topological Sort of FK Graph

GraphKahn's~25 min
Task 02unsolved

Deterministic Email Masking

HashingDeterminism~15 min
Task 06unsolved

Format-Preserving Phone Masking

HashingFormat~25 min
Day 2
Graph problems — subsetting and integrity
Task 03unsolved

Consistent Database Subset (BFS)

GraphBFS~40 min
Task 04unsolved

Cycle Detection in FK Graph

GraphDFS~25 min
Task 05unsolved

Chunked IN-Clause Query Builder

SQLPagination~10 min
Day 3
System design — concurrency and architecture
Task 07unsolved

Bounded Queue (Producer-Consumer)

Data StructuresBackpressure~20 min
Task 08unsolved

Transformer Registry (Strategy)

PatternsStrategy~15 min
Task 09unsolved

Level-Based Parallel Grouping

GraphParallel~25 min
Day 4
Production — resilience and dialect handling
Task 10unsolved

Checkpoint Manager

State MachineResilience~20 min
Task 11unsolved

JSON Deep Masking

RecursionImmutable~30 min
Task 12unsolved

Database Dialect Type Mapping

Cross-DBSealed~25 min