StrataDB

C++26 · CMake · TSAN / ASAN · Google Benchmark

An embedded key-value storage engine, built from the allocator up.

A ground-up storage engine focused on concurrency safety, memory locality, and predictable performance under multithreaded load.

• NUMA-aware arena allocator with thread-local allocation buffers and mmap huge-page fallback
• Lock-free skip-list MemTable — CAS insertion with append-versioned MVCC ordering
• Epoch-based reclamation with per-thread 4 KiB slabs for safe concurrent reads
• WAL staging with CRC32C / XXH3-128 integrity and Vyukov MPSC queue handoff

Axiom

Java 24 · NIO · Maven

A Redis-compatible server on a single-threaded event loop.

A from-scratch Redis-compatible server: one NIO event loop, direct ByteBuffer access, no thread contention, low GC pressure.

• 29+ commands across strings, lists, sorted sets, geospatial, streams, and pattern-matched pub/sub
• Custom QuickList and SkipList data structures backing lists and sorted sets
• PSYNC replication — RDB snapshot on initial sync, async incremental streaming
• Per-replica lag tracking via REPLCONF GETACK, WAIT-based sync guarantees

TicketLedger

Java 21 · Spring Boot · PostgreSQL · Stripe

A booking platform that refuses to double-book.

High-concurrency cinema ticketing where financial consistency wins every trade-off — designed documentation-first.

• Zero double-bookings via SELECT FOR UPDATE with strict lock ordering; hot-seat throughput analytically bounded by lock-commit latency
• Java 21 virtual threads park ~1M connections per JVM, isolating the 20-connection Hikari pool as the sole bottleneck
• Exactly-once payments through idempotent Stripe webhook processing
• Background jobs release held seats on a 5-minute timer and trigger notifications