Navid Hassantabar Email & Phone Number

Tehran, Iran

Divar is the leading online marketplace platform in Iran, serving 40+ million monthly active users.* Developed cloud-native applications within a Microservices architecture, utilizing Kubernetes, Go, Python, and Elixir.* Managed system ownership and on-call duties for over 30 systems, including a 20-node Cassandra cluster (2K writes/sec), a 12-node Elasticsearch (8K queries/sec), a 7TB PostgreSQL, and other databases and in-house solutions.* Orchestrated a PostgreSQL benchmarking and optimization initiative, analyzing diverse infrastructure setups. Achieved a 10x performance boost and facilitated migration for 15+ teams, establishing a new dedicated Database team.* Led the transition of a legacy Elixir/Cassandra chat service with 2.5 million daily users to Go/PostgreSQL, streamlining the tech stack and yielding 30% resource savings, with zero downtime despite the challenging database migration.* Built a Python library for UI element generation, adopted by 20+ teams across Divar, enhancing service integration and user interface consistency.* Redesigned backend services to implement concurrent programming using Python AsyncIO, Go goroutines, and gRPC Futures, improving response time by up to 4 times.* Authored and contributed to 50+ technical design documents and post-mortem analyses, mentored junior to mid-level developers, and conducted 150+ technical interviews; these roles spanned across positions within the Hezardastan Group.

Tehran, Iran

* Directed a multi-disciplinary team, scaling it from 5 to 12 members, and implemented Agile/Scrum methodologies, adapting workflows and metrics to maintain consistent performance during the transition to remote work amid COVID-19.* Led the development and management of OKRs for 4 quarters, achieving at least 75% of objectives, and conducted regular one-on-one meetings for performance reviews and career planning, resulting in 4 internal promotions.* Coordinated an 8-week summer camp with seven team leaders, narrowing 100+ applicants to 40 through contests and interviews, and integrating 30 new hires via a structured program of classes and team projects.* As a Backend Developer, refactored a critical search service to reduce memory usage by 75% and enhanced response time by 33% through optimizing cache utilization, while fulfilling team leadership.

Tehran, Iran

Sotoon powered the infrastructure for Divar and Cafe Bazaar, with 50+ million monthly active users combined.* Engineered data pipelines with Kafka (120K messages/sec), a 1-petabyte HDFS, a data processing cluster using Spark and Yarn (500+ CPU cores, 4+ TB RAM), and a Zeppelin environment for 70+ users.* Administered a cluster of 30 bare-metal servers, utilizing Ansible, Nomad, and Vagrant, and created a custom Gradle plugin with Groovy, adopted in 10+ projects, to streamline deployment.

Tehran, Iran

* Played a key role in the startup's growth, contributing to a team that scaled to 50 members and achieved 3 million monthly active users, while gaining experience in organizational development.* Developed Android/Java libraries including a low-memory download manager that handles unstable networks, a client-side load balancer, and an error/log reporting tool, all still in use after 8 years across different apps.

Master’S Degree, Computer Software Engineering

Bachelor’S Degree, Computer Software Engineering