Senior Ruby Developer
- Location
- Ukraine
- Rate, USD
- Not specified
- Work schedule
- Full Time,
- Language skills
- English, Ukrainian
- Available for Hire
- Yes
About me
I am a Senior Software Engineer with over 5 years of experience specializing in building scalable, production-grade systems using Ruby on Rails. Throughout my career, I have successfully delivered complex features end-to-end, including API integrations such as REST, SOAP, and GraphQL, payment systems, real-time streaming infrastructure, and marketplace mechanics. I pride myself on being an early adopter of AI technologies, having built production features on top of OpenAI GPT-3 as early as 2022.
I am comfortable working as the sole backend engineer on a team, taking ownership of architecture decisions and maintaining direct communication with international clients. My experience spans both product and outsourcing environments, collaborating with teams across Ukraine, the United States, and Poland. I am passionate about driving engineering standards through TDD, code reviews, and continuous integration practices.
In my recent roles, I have integrated complex payment processing systems, managed email infrastructure, and implemented CRM integrations that have streamlined business operations. I have also optimized database performance and CI/CD pipelines to improve efficiency and reduce costs. My technical expertise is complemented by strong problem-solving skills, teamwork, and agile methodologies.
I am eager to continue leveraging my skills in Ruby and backend development to build impactful software solutions, especially those that incorporate AI and cutting-edge technologies. I thrive in remote and collaborative environments where I can contribute to both product innovation and operational excellence.
I am currently pursuing a Doctorate of Philosophy in Technologies of Storage, Canning, and Processing of Milk, which reflects my commitment to continuous learning and expanding my knowledge base beyond software engineering.
Professional area
Education
- September 2023 – September 2027 Doctorate of Philosophy (PhD) in Technologies of Storage, Canning, and Processing of Milk @ National University of Food Technologies, Kyiv
Remote
Experience
- June 2024 — April 2026 Senior Ruby Developer @ LinkUp Studio
Acted as the sole backend engineer, defining architecture, enforcing code quality standards, and delivering features end-to-end without supervision. Collaborated directly with the client to translate product requirements into technical specifications and working features. Integrated Stripe payment processing handling ~6,000 transactions/month. Managed Mailchimp email infrastructure with ~30 active templates and 20,000+ active recipients. Implemented HubSpot CRM integration, including a successful launch of automated deals pipeline. Denormalized key database structures, optimizing a critical endpoint from ~3s response time down to 500ms — a 6x performance improvement. Conducted code reviews and drove TDD practices, maintaining high engineering standards across the entire backend. Optimized the CI/CD pipeline by parallelizing the test suite, reducing deploy run time by 30%, and cutting build-minute costs proportionally. Led a full platform upgrade from Ruby 3.x to Ruby 3.4 and Rails 7 to Rails 8, resolving compatibility issues across ~50 dependent gems.
- July 2025 – September 2025 Senior Ruby Developer (Concurrent Engagement) @ Cyfluencer
Designed and shipped the core pay-per-share system: Kafka-based tracking, fraud-resistant attribution, and per-share influencer payouts across ~30 active campaigns.
- April 2023 — April 2024 Middle Ruby Developer @ DRCT
Integrated 2 airlines end-to-end — from direct communication with airline representatives to production-ready API implementation with SOAP/REST normalization. Improved a hybrid Python/Ruby parser, bringing the total integrated data sources to 3 and expanding available inventory for clients. Collaborated directly with airline representatives and clients to clarify requirements and iterate on features rapidly.
- April 2022 — April 2023 Ruby Developer @ JetRockets (USA)
Built AI-powered meal parsing integration using OpenAI GPT-3 API — converting free-text meal descriptions into structured ingredient lists. Integrated USDA FoodData Central API to fetch nutritional data per ingredient. Built the entire backend for an iOS banking app with cashback rewards system, delivering full backend within 3 months and validating core product assumptions.
- March 2021 — April 2022 Ruby Developer @ DevTactics (Poland)
Diagnosed and fixed an open-source CLI gem that had been broken for 6+ months, restoring a critical part of the development workflow.
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