Ravyar Tahir

Real-time fleet tracking, AI/RAG, payments, billing and observability across the group.

• Own backend architecture across the group as its only senior backend engineer; lead architecture reviews and system design sessions, and mentor engineers through code review.
• Built Rega, a real-time platform for bus and taxi fleets with live vehicle tracking and in-app chat, sustaining 5,000+ concurrent WebSocket connections at <200ms P95 latency with zero data loss under peak load.
• Built an internal AI assistant (RAG) on Milvus with multilingual BGE-M3 embeddings, cross-encoder re-ranking and MCP tool integration, cutting query latency from 2s to under 400ms and streaming answers over SSE.
• Integrated the HyperPay and Areeba payment gateways and led the PCI DSS compliance work.
• Designed and demonstrated a Go replacement for the ISP billing platform (PostgreSQL/Citus, Patroni failover, FreeRADIUS behind HAProxy), removing the single-primary MySQL and single-RADIUS points of failure; the demo runs against a live NAS server and devices.
• Built a ClickHouse log pipeline ingesting 240GB of logs per day.
• Introduced distributed tracing, structured logging and circuit breakers across real-time and AI services, reducing peak-traffic incidents.

Shipped billing, ISP self-care and product backends end to end.

• Shipped vendor-agnostic billing middleware across multiple product lines, cutting reconciliation workload by 70% and vendor onboarding from weeks to hours.
• Worked on IQ DigiCare, the customer self-care platform for ISP IQ Online, then built the equivalent platform for Optiq, a second ISP brand serving different cities.
• Wrote the backend for Kurdim, a Kurdish-language learning app for English speakers, alone and end to end.
• Built a voucher management system that issues prepaid internet cards for IQ Online.
• Built a scraping service that collects live readings from IQAir air-quality monitoring devices.

Sole engineer on a healthcare platform used daily by 59 doctors, plus projects for 5+ clients.

• Sole engineer for Gloctor (formerly Kurdoc), a healthcare platform for clinic queues, medical records and prescriptions used daily by 59 doctors; migrated it from PHP to Python and then to Go, resolving throughput bottlenecks and cutting API response times.
• Delivered backend projects for 5+ clients across fintech, healthcare and logistics, designing REST/gRPC APIs and automated data pipelines in Go and Python.