Олег

Tanchyn Oleh
[open contact info](look above in the "contact info" section)
Ukraine, Lviv
[open contact info](look above in the "contact info" section)
LinkedIn

Full stack Software Engineer

Summary of Software engineer with 9.5 years of professional experience in web development.
Qualifications My projects are well-structured, the code is clean, semantic and easy-to-maintain.
Layouts of web applications are responsive, valid and cross- browser.
Team leader skills, estimation projects, working with production sites by SSH, configuring
automated mail sending, speed optimizations, search engine optimization.
Experienced with different web applications, so I fast fix different bugs. I always try to write clean
code, so it will be easy to understand other team members. Honest, reliable and hardworking.
Good team player, I like to learn and use new technologies, also like to solve hard tasks, I enjoy
my work and I always try to do my work the best to have customers satisfied.

Education • 2 Higher Educations • Type: Multimedia, Marketing

Skills Programming Languages/ Technologies Frameworks
• Ruby (v.2 - v.3), Ruby on Rails (v.5 - v.8) • Rails (Ruby)
• RSpec, Rubocop, RMagick, Devise, Swagger • Laravel (PHP)
• React JS, Vue.js
• PHP Application/Web Servers
• WordPress, Drupal, OpenCart • Puma
• HTML5 • Jenkins
• CSS, Bootstrap, Sass, Webpack, Tailwind CSS • NPM
• JavaScript, jQuery, CoffeeScript, StimulusJS • Apache
• Nginx
• AWS S3, AWS EC2
Database
• MySQL Development Tools
• PostgreSQL • IDE RubyMine
• Redis • Postman
• Elasticsearch as DB
Event Streaming/Message Broker
Version Control System & Repositories • RabbitMQ
• GIT • Kafka
• Bitbucket, GitLab, GitHub

Languages AI API/AI Development Tools
• English: Intermediate • Gemini API/Pro
(B2 technical, B1 non-technical) • Perplexity API
• Ukrainian • GPT Codex
• Claude
 Tanchyn Oleh
Full Stack Software Engineer
Experience
Real Estate Project (April 2024 – Current)
Project Description: Digital platform for short-term commercial real estate rentals.
Involvement Duration: 2 years 6 Month:
Project Role: Senior Full stack Ruby on Rails Software Developer
Responsibilities: • Developed main features for short-term space rentals and bookings.
• Integrated AI tools (Gemini & Perplexity APIs) for smart space
recommendations.
• Optimized database queries and backend code to speed up the app.
• Helped release a new user interface and fixed production bugs.
• Participated in daily Agile meetings, task estimation, and code planning.
Project Team Size 6 team members
Tools & Technologies: Ruby, Ruby on Rails, Ruby Gems, Tailwind CSS, Elasticsearch, PostgreSQL.
AI Integrations (Gemini, Perplexity).

eCommerce Project (July 2024 – January 2025)
Project Description: eCommerce Platform for building webshops, multi-shops, and dropshipping
systems.
Involvement Duration: 7 Months
Project Role: Senior Full-Stack Ruby on Rails Software Developer
Responsibilities: • Built backend features for a multi-shop eCommerce platform.
• Set up CI/CD workflows to make software deployments faster and smoother.
• Conducted code reviews and helped teammates maintain clean code.
• Fixed application issues and improved database performance.
Project Team Size: 12 team members
Tools & Technologies: Ruby, Ruby on Rails, Ruby Gems, StimulusJS, Elasticsearch, PostgreSQL, CI/CD.

Healthcare Project (December 2023 – June 2024)
Project Description: Job search portal for medical professionals and vacancy placement platform for
healthcare clinics.
Involvement Duration: 6 Months
Project Role: Middle Plus Full-Stack Ruby on Rails Software Developer
Responsibilities: • Created an Admin Panel to manage users, doctors, and job posts.
• Wrote unit and integration tests (RSpec) to ensure system stability.
• Developed REST API endpoints to connect doctor profiles with clinic vacancies.
• Found and fixed complex bugs across the application.
Project Team Size: 5 team members
Tools & Technologies: Ruby, Ruby on Rails, Ruby Gems, React, TypeScript, PostgreSQL.

SumatoSoft (September 2022 - November 2023)
Project Description: Feedbacks CRM System.
Customer: Foreign Company
Involvement Duration: 1 year 4 Months
Project Role: Middle+ Full stack Software Developer
Responsibilities: • Led team meetings, estimated tasks, and conducted regular code reviews.
• Mentored junior developers and helped them follow best practices.
• Developed full-stack features connecting Rails API with React components.
• Designed and implemented full-stack CRM features connecting Rails API backend
with modern React client interfaces.
Project Team Size: 9 team members
Tools & Technologies: Ruby, Ruby on Rails, Ruby Gems, PostgreSQL, React.
 SoftServe Company Client (NDA) (January 2022 – August 2022)
Project Description: Intelligence risk management and real-time visibility for supply chains
Customer: Foreign Company
Involvement Duration: 8 Months
Project Role: Middle Back-End Software Developer
Responsibilities: • Supported backend services for real-time supply chain tracking.
• Optimized PostgreSQL queries and Elasticsearch indexes for fast search.
• Worked with cross-functional teams to build enterprise APIs.
• Investigated and resolved production issues, fixed flaky tests quickly.
Project Team Size: 50 team members in the project, 8 team members in my team.
Tools & Technologies: Ruby, Ruby on Rails, Ruby Gems, React, Elasticsearch, PostgreSQL.

SoftServe Company (June 2021 – January 2022)
Project Description: Ruby on Rails Retraining Program Project
Customer: UKRAINE Company
Involvement Duration: 7 Months
Project Role: Middle Back-End Software Developer
Responsibilities: • Implementation project features.
• Refactored legacy Ruby on Rails codebase components, improving modularity
and overall maintainability.
Project Team Size: 7 Month
Tools & Technologies: PostgreSQL, Ruby, Ruby on Rails, Ruby Gems, JavaScript.

Qarea Corporate Website (Aug 2019 - Jun 2021)
Project Description: Plugin-based platforms for open-source Content Management Systems
(WordPress), Corporate website with blog based on Gutenberg React Blocks.
Customer: UKRAINE Company
Involvement Duration: 1 year 10 Months
Project Role: Team Lead Senior Software Developer
Responsibilities: • Selected technology stack and built custom plugins for WordPress/Gutenberg.
• Mentored junior developers and helped them improve their skills.
• Created custom REST APIs and automated email notification systems.
Project Team Size: 4-14 team members
Tools & Technologies: PHP, WordPress, Gutenberg, React, MySQL, JavaScript, Jenkins, Webpack.

Zaprinta Ecommerce Website (May 2018 - Aug 2019)
Project Description: Online store worked on open-source Laravel framework.
Customer: Belgium Company
Involvement Duration: 1 year 4 Months
Project Role: Middle Software Developer
Responsibilities: • Built Laravel backend features and dynamic Vue.js components for online stores.
• Integrated payment gateways and automated order processing.
• Fixed bugs, optimized MySQL queries, and improved app performance.
Project Team Size: 3 team members
Tools & Technologies: PHP, Laravel, Vue.js, MySQL, JavaScript, HTML, Ajax.