Faisal Affan

I’m a Senior software engineer with 5+ years of experience building mission-critical backend systems using Node.js, Python, and TypeScript. I focus on REST API design, multi-tenant architecture, and real-time systems that serve 4.1M+ customers, while communicating fluently in English with international stakeholders.

At PT Bank BTPN Syariah Tbk (BTPN Syariah), I solo-built the entire backend for Project Tepati (Offline-First Micro-Finance) in 30 days—from architecture to production—using Go, Apache Kafka, MQTT, and MongoDB. I secured the system with TLS 1.3, certificate pinning, JWT device binding, and OAuth2, passing OJK penetration tests; I also implemented a Circuit Breaker pattern to reach 99.7% API availability during core banking maintenance windows. I scaled the customer base from 2.8M to 4.1M (+46% YoY), decreased cost per acquisition by 62% YoY, and reduced offline data loss from 23% to 0% with an offline-first sync engine using delta sync.

Previously at Kano Teknologi Utama, I designed an Edge-to-Cloud IoT telemetry pipeline (MQTT → Edge Gateway → Kaa → InfluxDB) achieving 50,000 events/sec at under 50ms latency, and built a real-time geofence evaluator that reduced zone breach detection latency from 5–15 minutes to under 2 seconds. I’ve also delivered fleet management infrastructure, predictive maintenance that reduced unplanned downtime by 64%, and fraud/risk and operational modules such as cyber risk scoring dashboards and HSE orchestration. Alongside delivery, I mentor 20+ junior developers on backend architecture and contribute to OpenTelemetry as a maintainer for Go SDK instrumentation.