Serhii

SERHII MAHAS
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[open contact info](look above in the "contact info" section) Ukraine

SUMMARY SKILLS

Full-stack Ruby on Rails developer with experience maintaining and extending production Front-end:
SaaS platforms as part of distributed development teams. Comfortable across the stack —
from background job orchestration (Sidekiq) and payment integrations (Stripe, Paddle) to HTML5 CSS3 Sass/SCSS
modern front-end development with Hotwire (Turbo & Stimulus). I continuously build practice
Tailwind CSS JavaScript jQuery
projects to stay current with the latest Rails (7/8) ecosystem and clean architecture patterns
(service, query, and form objects). Reliable, communicative, and focused on shipping Bootstrap Hotwire (Turbo & Stimulus)
maintainable, well-tested code.

Back-end:
EXPERIENCE Ruby Ruby on Rails Sidekiq

Botster — SaaS Automation Platform 2023 - 2025 RESTful APIs JSON APIs JWT

Position: Full-Stack Ruby on Rails Developer
• Maintained and extended a multi-tenant SaaS platform (60+ domain models) for Databases:
automated SEO/marketing algorithms, working within an existing development team. PostgreSQL, MySQL, Redis
• Worked across a Sidekiq-based background job pipeline (13 workers) handling algorithm
execution, output processing, and failure handling.
• Extended Paddle billing integration: subscriptions, credit-based wallets, and affiliate Payments & Integrations:
tracking.
• Maintained a public REST API (v1/v2, JWT auth) used for Zapier and third-party Stripe Stripe Connect Paddle AWS S3
integrations.
• Worked with a distributed worker fleet (Dockerized Sidekiq workers running Google APIs Slack bots Telegram bots
Selenium/Watir/Puppeteer) for browser automation at scale.
• Integrated and maintained third-party services: Slack, Telegram, Google APIs (Analytics,
Search Console, Gmail, YouTube), Brevo, OneSignal, Facebook Pixel. DevOps & Tooling:
Docker Heroku Capistrano RSpec
LokiC — Enterprise CMS / Workflow Platform 2021 - 2023
Capybara Rubocop
Full-Stack Ruby on Rails Developer
• Maintained and extended a large-scale content/workflow management platform (150+
domain models): publication workflows, scraping tasks, and work request tracking. Workflow:
• Implemented features within a role-based access control and permissions system. Git, Jira, Trello, Asana
• Built features using Sidekiq background jobs, Slack notifications, and RailsAdmin.
• Built reporting and data-grid views (datagrid gem) for internal admin users.
• Worked with a Stimulus/Turbo + Webpacker front-end (Bootstrap 4).

Greyt.me & Twitter2Roam — API & Data Integration Projects 2019 - 2021

Full-Stack Ruby on Rails Developer
• Developed features for a JSON API backend (Greyt.me) connecting students with
advisors for paid project feedback.
• Implemented Stripe Connect payment splitting for advisor payouts and real-time
messaging via Action Cable.
• Integrated AWS MediaConvert/Lambda for media file processing pipelines.
• Built a Rails service (Twitter2Roam) to bulk-import a user's tweet history via Twitter API
v2, with paginated fetching and bulk inserts via activerecord-import.
• Containerized the application with Docker.

EDUCATION

Python Programming Course, Certificate of Completion 2017 - 2019
IT Academy "STEP"

Bachelor's and Specialist's Degree in Computer 2001 - 2006
Systems and Networks
Zaporizhzhya National Technical University

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