Software engineer with 2+ years in production — Python, AI, and distributed systems. Writing and work by Amal Krishna M U.https://lyfofdev.com/enhttps://lyfofdev.com/writing/margin-engine-offline-replay/https://lyfofdev.com/writing/margin-engine-offline-replay/A phone is off for eight minutes. A goal gaps the price. Their position should have died. At what price do you close it?Wed, 07 Oct 2026 00:00:00 GMTGoFintechTrading SystemsRisk EnginesFTLhttps://lyfofdev.com/writing/crash-safe-write-behind/https://lyfofdev.com/writing/crash-safe-write-behind/We silently dropped 4,364 price ticks. No error, no alert, green dashboards. Here's the design where dropping is impossible by construction.Wed, 30 Sep 2026 00:00:00 GMTGoRedisPostgreSQLDistributed SystemsFTLhttps://lyfofdev.com/writing/websocket-fanout-50k-users/https://lyfofdev.com/writing/websocket-fanout-50k-users/Staging was burning ₹1,234 a day. Every dashboard was green. Here's how we streamed live prices to 50K phones on a $200 credit.Wed, 23 Sep 2026 00:00:00 GMTGoWebSocketsSystem DesignLow LatencyFTLhttps://lyfofdev.com/writing/atomic-trades-redis-lua/https://lyfofdev.com/writing/atomic-trades-redis-lua/Every trade touches a wallet, a position, a price, and a leaderboard. Four ways to be half-done. We used zero locks to make that impossible.Wed, 16 Sep 2026 00:00:00 GMTGoRedisSystem DesignFintechFTL