Contact Information
Name: Olga Coskun
Location: Istanbul, Turkey
Name: Olga Coskun
Location: Istanbul, Turkey
Ruby on Rails developer with 7+ years of commercial experience building scalable backend systems, REST APIs and integrations with external services, including payment systems and cryptocurrency gateways.
Experienced in refactoring legacy code, improving test coverage, participating in code reviews and maintaining production systems used by real users.
Strong focus on backend architecture, API integrations and reliable production deployments.
Ruby on Rails • REST APIs • Microservices • Payment Integrations • PostgreSQL
Backend: Ruby, Ruby on Rails, MVC architecture, OOP, SOLID principles, REST API development, RSpec, Minitest, Code review, Refactoring
Integrations: Payment systems integration, Cryptocurrency payment gateways, Third-party APIs, JSON, JWT, Swagger
Microservices: API development, Interactors, Serializers, Dry-rb, Sidekiq
Frontend: HTML5, CSS3, Bootstrap, JavaScript
Databases: PostgreSQL, MySQL, Redis, MongoDB
DevOps: Docker, Kubernetes, NGINX, Passenger, Capistrano, DigitalOcean, Heroku, Cloudinary
Tools: Git, Postman, Linux (Ubuntu)
Ruby on Rails Developer
2022 – Present
Gambling Platform — Remote
Development and maintenance of backend services using Ruby on Rails
Design and support of REST APIs for internal services and external integrations
Integration of external payment systems including cryptocurrency payment providers
Refactoring legacy code to improve maintainability and performance
Writing automated tests and improving test coverage (RSpec)
Participation in code reviews and maintaining code quality standards
Integration with third-party APIs
Maintaining production backend systems used by real users
Ruby on Rails Developer
Jun 2021 – May 2022
Medical Clinic, USA — Remote
Backend development using Ruby on Rails
Writing Capybara tests
Localization of application into multiple languages
Bug fixing and feature improvements
Integration with external medical services
Working with HL7 medical protocol
Ruby on Rails Developer
Mar 2021 – Jun 2021
Siri — Moscow
Development of microservices
API development and integration
JWT authentication and Swagger documentation
Background jobs using Sidekiq
Kubernetes deployment
Full Stack Developer
Mar 2020 – Feb 2021
Medical Clinic — Moscow
Developed medical appointment system from scratch
Admin panel for doctors
Backend development with Ruby on Rails
Frontend with Bootstrap and JavaScript
Deployment and server setup
Ruby on Rails Developer
Sep 2019 – Feb 2020
Internet Marketplace — Moscow
Localization of the platform into Turkish
Improving test coverage
Bug fixing and feature development
Kostroma State University
Master’s Degree in Management
1999 – 2004
Russian — Native
English — Intermediate
Turkish — B1
Working out
Learning languages
Swimming, cycling