Enes
Uysal DevOps Engineer & Site Reliability Engineer (SRE)

Schedules PostgreSQL backups with cron expressions. Hosts and databases are defined in a JSON file, and each database can run full or single-table pg_dump jobs on its own schedule.

SMTP load testing tool with configurable workers, job counts and message sizes. Reports successful and failed sends and the minimum, average and maximum time of each SMTP stage.

Layer 4 TCP load balancer that distributes connections round-robin, forwards data in both directions and skips backends that fail its periodic health checks.

Kubernetes manifests and shell scripts for highly available Redis (master, replicas and Sentinel) and PostgreSQL primary/replica replication. HAProxy health checks route Redis traffic to the current master.

Worker pool module for Go: a fixed number of goroutines take tasks from a buffered channel, with per-task failure callbacks and graceful shutdown. It powers smtp-load-test.

Ordered YAML parser for Go that reads a file into a tree, gets and sets values by key path and writes the document back in its original key order.

Real-time chat server built with Go and WebSockets. Users and messages are stored in PostgreSQL through the ent ORM, with a JavaScript client and a Docker Compose setup.

Concurrent web crawler in Go that follows same-domain links with goroutines and collects the image URLs found on every page.

REST API for an interactive dictionary, built with Laravel and MySQL: topics, entries and likes with OAuth2 (Passport) authentication and role-based permissions for admins, moderators and users.

Huffman coding in Python: builds a Huffman tree from the character frequencies of a text and prints the variable-length prefix code of each character.

Approximates square roots in C++ with a Taylor series expansion, choosing the number of terms from a target error bound.