Mina Z is a highly skilled Software Engineer with strong expertise in backend systems, cloud infrastructure, AI-powered applications, and scalable web development. She has hands-on experience building and maintaining high-performance systems using Ruby on Rails, Angular, React Native, ASP.NET, Nest.js, JavaScript, Python, C#, and SQL across healthcare, education, and enterprise platforms. Mina has worked extensively with PostgreSQL, MySQL, MongoDB, Firebase, and Redis, optimizing large-scale databases and search… Show more

1. Freelance Software Engineer

   Skolera· EdTechFeb 2026 — Present

   • Developed and maintained scalable backend services using Ruby on Rails, supporting 300K+ users.
   • Contributed to business growth by enhancing a core feature and transitioning it into a subscription-based offering, creating a new revenue stream for the product.
   • Led upgrade of legacy systems (Rails 4.2 → 5.2, MySQL 5.7 → 8.0), enhancing system stability and maintainability.
   • Optimized asynchronous processing using Sidekiq + Redis, improving throughput and reducing infrastructure costs.
   • Diagnosed and resolved production issues using monitoring tools (Datadog, Airbrake), ensuring high availability.

   Ruby on RailsSidekiqRedisMySQLDatadogAirbrake
2. Software Engineer

   UsytechAug 2024 — Present

   • Designed and implemented scalable backend services and APIs using Nest.js, handling high-volume medical data ingestion.
   • Built and optimized data pipelines using AWS SQS and event-driven architecture for reliable message processing.
   • Migrated OpenSearch to PostgreSQL FTS, achieving sub-100ms latency on 2B+ records and reducing infra costs by 85%.Documented architecture and migration strategy in a Medium article.
   • Designed relational database schemas and wrote complex queries for PostgreSQL, improving performance and data integrity.
   • Deployed and maintained backend services on AWS, leveraging SQS, ECS, Lambda, and Docker-based CI/CD pipelines.

   Nest.jsAWS SQSPostgreSQLAWS (Lambda, Cognito, SQS, EC2, ECS)Docker

1. Computer Science Graduate

   Faculty Of Computer and Artificial IntelligenceHelwan, Egypt2020 — 2024