Hamed Nourhani — Staff Software Engineer

About

Staff Software Engineer with 7+ years building distributed systems at scale, powering 1M+ deliveries a day across 70+ countries. I specialize in conflict resolution, state synchronization and operational resilience for high-traffic services, and I lead cross-team initiatives through RFCs and cell-based architecture design.

1M+

deliveries per day
70+

countries
50% → <20%

failure blast radius via cells

Experience

Staff Software Engineer · Delivery Hero

Mar 2025 – Present

Cell-based architecture: led design and rollout across the Optimization Tribe (Dispatch, Routes, Algorithm, STVS), cutting failure blast radius from 50% country-wide outages to under 20% fleet-level isolation.
Dispatch rewrite: core contributor (Kotlin, Quarkus) using optimistic locking with Redis transactions, timeout-based recovery and fleet-level horizontal scaling.
Conflict resolution: validation pipeline reconciling algorithm-optimized routes with real-time changes such as cancellations, offline couriers and locked deliveries.
Leadership: authored RFCs, mentored engineers, and improved runbooks and observability for 24/7 operation of Tier-1 services (3M+ daily orders).

Senior Software Engineer · Delivery Hero

Dec 2022 – Mar 2025

State synchronization: idempotent event processing for delivery and courier state, handling out-of-order events with versioning and route adjustment.
Conflict resolution: 12-step validation pipeline between optimized routes and live state changes.
Observability and load testing: Prometheus and Grafana dashboards for incident management.

Senior Software Engineer · SoundCloud: Aug – Dec 2022
Software Engineer II · Delivery Hero: Mar 2020 – Dec 2022
Full Stack Engineer · Snapptrip: Jul 2018 – Feb 2020
Remote Scala Developer · Trail Blaze: May 2018 – Jan 2019
Full-stack Developer · Sanjagh: Nov 2016 – May 2018

Selected Work & Talks

Shadow testing & migration framework: validators and shadow-mode testing for a global Tier-1 service migration, enabling safe traffic switching and zero-downtime rollout.
RFC: cell-based architecture: co-authored and implemented fleet-level isolation for Tier-1 services.
LoOks 2025, Dispatch Service internals: 60-minute deep-dive on state synchronization, Redis transactions and conflict resolution.

Tech Stack

Languages: Kotlin Scala Java Python
Data: Redis PostgreSQL MongoDB DynamoDB
Cloud / Infra: AWS Kubernetes Terraform Helm Spinnaker
Practices: Distributed Systems Cell-Based Architecture CQRS / Event Sourcing Shadow & Load Testing Prometheus / Grafana

Connect

Email me LinkedIn GitHub Blog