Juspay Technologies
return offerSoftware Development Engineer
Aug 2025 — Present Bengaluru, India
16K IDs/ms
127 cells
- Built an agentic RCA tool in production use by on-call engineers: a Slack mention starts an orchestrator that delegates to specialist sub-agents across docs, Bitbucket, Jira and live telemetry through an MCP server I wrote over Slack, Grafana, Kibana and VictoriaMetrics.
- Built ART, a record-and-replay regression platform that tests new reconciliation code against 1–2% of live traffic over a 7–14 day window before every release; used by 20+ engineers across 2 teams.
- Architected and shipped a Snowflake-style distributed ID generation system processing 16K+ IDs/ms per cell across 127 isolated cells, serving a payments platform of 300M+ daily transactions at sub-5ms p99 under peak production load.
- Migrated a closed-loop payment routing engine to a multi-region active-active cell architecture, redesigning multi-armed bandit explore-exploit logic with per-cell Redis scoring sliding windows to preserve statistical confidence under asymmetric traffic.
- Building a Haskell-to-Rust transpiler for the core payment routing codebase, powered by a multi-agent pipeline (parse → semantic mapping → property-test verification → human review) with a deterministic classical fallback where probabilistic generation drifts — derisking the migration of type-rich Haskell semantics to memory-safe Rust without lift-and-shift breakage.
- Built a shared Rust service framework (database- and cloud-agnostic, one service runs on AWS or on-prem unchanged) and a fault-tolerant ETL platform — in-memory → Redis Streams → database fallback — serving 15+ analytical pipelines.