Full Stack Engineer

Open to part-time

Bio

Mina S is a Full Stack Engineer with several years of experience in backend systems, cloud infrastructure, and scalable web development. She primarily works with Ruby on Rails, Nest.js, PostgreSQL, AWS services, and Docker to build scalable backend services and APIs. Mina is skilled in optimizing data pipelines and implementing event-driven architectures, with a focus on high performance and cost efficiency. Her work includes deploying services on AWS using CI/CD pipelines and ensuring system stability through monitoring tools. At Skolera, Mina developed and maintained backend services supporting over 300,000 users, enhancing system stability and creating new revenue streams. At Usytech, she achieved sub-100ms latency on over 2 billion records by migrating OpenSearch to PostgreSQL Full-Text Search, reducing infrastructure costs by 85%. Mina is a Computer Science graduate from the Faculty of Computer and Artificial Intelligence in Helwan, Egypt. She is well-suited for roles that require designing and maintaining high-performance systems, particularly in industries like healthcare and education.

Expertise

Ruby on RailsPythonSQLAWSMongoDBAngularReact NativeC#

Video Intro

Assessments

Take Home: Problem Solving Assessment

Great score on Word Search in Grid, Difficulty Medium · Great score on Validate Parentheses in a String, Difficulty Hard · Great score on Reverse Digits of a 32-bit Integer, Difficulty Medium

Experience

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
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