SENIOR RUBY
DEVELOPER

2015-2019

NTU Dnipro Polytechnic

Master of Software Engineering

I gained extensive hands-on programming experience and developed a strong foundation as a software developer.

2011-2015

Rocket-and-Space Engineering College

Software engineering

Studied basics of programming and got a junior specialist diploma.

Jan 2026 — Present

Flight Centre Travel Group — Global travel company

Senior Ruby on Rails Developer

• Established a Service Level Objective (SLO) in Datadog to monitor GraphQL API performance, targeting latency and reliability with an error rate threshold of <1% for GraphQL requests.
• Designed and implemented a CSV bulk upload feature with large-scale data import efficiency and system scalability.

Oct 2023 — Apr 2025

Washos — On-demand mobile car wash services

Senior Ruby on Rails Developer

• Migrated users to CleverTap for advanced segmentation — increased customer engagement by 30% and drove a 20% uplift in ROI.
• Reduced API serialization time by ~80% by replacing ActiveModel::Serializer with Oj::Serializer.
• Upgraded core stack: Ruby 2.7.5 → 3.3.7 and Rails 5.2 → 7.0.8 for performance and long-term support.
• Eliminated Heroku R14 memory issues via profiling, caching and server tuning — 3x reduction in response time.

May 2022 — May 2023

Huckleberry — Insurance broker company

Ruby on Rails Developer

• Enhanced Certificate of Insurance generation system using React.js and the fillablepdf library, improving user experience and automating document creation workflows.
• Successfully led the design and release of the V3 API, improving scalability, performance, and maintainability across core services.
• Integrated Apache Kafka for log auditing, boosting log processing speed by 60% and increasing system scalability and performance under high load.

Mar 2021 — Apr 2022

Envol — Mind-body wellness app

Ruby on Rails Developer

• Designed RESTful APIs supporting scalable, maintainable service interactions.
• Built a subscription processing system integrated with App Store and Play Store for in-app purchases.
• Engineered a recommendation engine using the Strategy pattern, supporting 520+ conditions.
• Created a Trends feature leveraging PostgreSQL's generate_series() for efficient time-series aggregation.

Mar 2019 — Jan 2022

SwiftComply — B2B online marketplace

Ruby on Rails Developer

• Developed and integrated a signature feature, enabling secure digital signing and improving document workflow efficiency.
• Participated in code reviewing, investigating mistakes in the code, and raising them to the team.
• Delivered technical talks on AWS ECS deployment and authored articles on managing custom fields for an ActiveRecord object in Rails, enhancing team expertise.

Oct 2018 — Feb 2019

AttributionApp — AdTech company

Ruby on Rails Developer

• Added Quora Ads API integration for client spend tracking with 100% test coverage.
• Replaced notification alerts using React.js for real-time updates, increasing user engagement by 15%.

Apr 2018 — Nov 2018

ErinoakKids — Children's treatment center

Ruby on Rails Developer

• Designed application architecture from scratch with RBAC-based authorization.
• Implemented advanced filtering with the Ransack gem.
• Integrated a third-party chat system, enabling more effective communication between patients and staff.

Oct 2017 — Apr 2018

Helsetjenester — Healthcare marketplace

Ruby on Rails Developer

• Built a new integration with Opus Dental using SOA architecture and the Factory pattern, enabling patients to book dentist appointments through the Helsetjenester portal.
• Set up automated server deployment using the Capistrano gem.

Feb 2017 — Sep 2017

MTP — Mystery Shopping Service

Ruby on Rails Developer

• Added new functionality to the MTP Portal based on user stories.
• Participated in discussions of new features with the support team.
• Helped the service company complete the V2 version of the product.

Oct 2023 — Oct 2025

Folium — Mobile Book Summaries App

Founder / Full-stack Mobile Developer

• Designed and developed a 12+ screen mobile application on the FlutterFlow platform, implementing a custom audio player and text reader.
• Generated large-scale content (text, book covers, and audio) for 1,500 digital books using Vertex AI and Gemini generative models.
• Integrated subscription and monetization features via RevenueCat, enabling seamless in-app purchases.
• Implemented secure authentication workflows including Apple Sign-In and Google Sign-In.

Feb 2018 — Jun 2018

NKAN — Open Data Portal CMS

Full-stack Developer

• Built a backend-free open data portal powered by Express.js and MongoDB.
• Developed a CLI-based installation and configuration system for simplified project setup.
• Built localization support with multilingual interface support for English and Ukrainian.

Oct 2013 — Dec 2014

Sellpub — Listing website for sale social media groups

Founder / Full-stack Developer

• Built a marketplace platform for buying and selling social media groups across multiple platforms.
• Implemented messaging between buyers and sellers.
• Integrated payment gateway for listing promotions.