Jathurchan Selvakumar — Software Engineer & SRE at Google. I build systems that survive failure: distributed systems, observability, and RaftLock, a Raft-based distributed lock in Go.https://jat.work/en-ushttps://jat.work/blog/raftlock-a-distributed-lock-that-survives-crashes/https://jat.work/blog/raftlock-a-distributed-lock-that-survives-crashes/Why I built a Raft-based distributed lock from scratch in Go — and how its five layers fit together.Mon, 22 Jun 2026 00:00:00 GMTDistributed Systemshttps://jat.work/blog/raftlock-the-consensus-engine/https://jat.work/blog/raftlock-the-consensus-engine/Leader election, log replication, a single-threaded core, and the simulation framework I used to trust it.Sat, 20 Jun 2026 00:00:00 GMTDistributed Systemshttps://jat.work/blog/raftlock-a-storage-engine-built-for-one-job/https://jat.work/blog/raftlock-a-storage-engine-built-for-one-job/Why I wrote a custom append-only log instead of reaching for RocksDB — and how it survives a crash mid-write.Thu, 18 Jun 2026 00:00:00 GMTDistributed Systemshttps://jat.work/blog/raftlock-the-state-machine-behind-the-lock/https://jat.work/blog/raftlock-the-state-machine-behind-the-lock/Heaps for expiration and priority, an LRU read cache, and the snapshot detail that channels can't survive.Tue, 16 Jun 2026 00:00:00 GMTDistributed Systemshttps://jat.work/blog/raftlock-the-integration-layer/https://jat.work/blog/raftlock-the-integration-layer/Turning asynchronous Raft replication into a synchronous gRPC reply — and the tracker that makes it work.Sun, 14 Jun 2026 00:00:00 GMTDistributed Systemshttps://jat.work/blog/raftlock-a-smart-client-for-a-hard-problem/https://jat.work/blog/raftlock-a-smart-client-for-a-hard-problem/Leader discovery, retries with jitter, fencing tokens, and auto-renewal — hiding distributed consensus behind a clean SDK.Fri, 12 Jun 2026 00:00:00 GMTDistributed Systems