Simple company's website containing basic information about the company, employees, and blog for publishing programming articles.
Zakres obowiązków
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Refactoring legacy code
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Customizing the website for SEO purposes
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Maintenance and bug fixing
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Improve website performance on the both mobile and desktop side
System for global FMCG company to manage the efficiency of work with multidimensional dependent structures adapted to corporate level operations.
Technologie
Ruby on Rails
RSpec
Sidekiq
Bootstrap
Grape
jQuery
AJAX
Zakres obowiązków
-
Data management & operation
-
Debugging
Application for a company producing specialized metallurgical equipment, for proper presentation of highly specialized products with photos, descriptions, and videos.
Technologie
Ruby on Rails
RSpec
Sidekiq
Bootstrap
Grape
jQuery
AJAX
Zakres obowiązków
-
Making appointments in the calendar
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Assigning clients to doctors
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Management of doctors' working hours
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Maintenance and bug fixing
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Debugging
An e-commerce application for a brand specializing in healthy and natural nutrition products based on Spree.
Technologie
Ruby on Rails
RSpec
Sidekiq
Bootstrap
Grape
jQuery
AJAX
Zakres obowiązków
-
Adaptation of frontend views to the client's needs
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Adapting the payment process to the Polish quick payment broker
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Adapting the order process to the customer's needs
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Connecting the payment process with the order administration process
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Modification of sending emails at each order level
An online doctor appointment application.
Technologie
Ruby on Rails
RSpec
Sidekiq
GraphQL
Twilio
Postman
Zakres obowiązków
-
Preparation of endpoints for the frontend
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Preparation of the login process for both the doctor and the patient
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Preparation of the payment system
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Integration with external applications
Web-based collaborative procurement platform designed to facilitate the full tendering process for both tenders and bidders.
Technologie
Ruby on Rails
Docker
Sequel
GraphQL
AWS
React
ROM
Information portal for a professional group.
Technologie
Ruby on Rails
jQuery
Vagrant
Zakres obowiązków
-
Implementation of features on the backend and frontend side of the application
Medical industry platform to increase visibility and streamline data management and analytics throughout the product life cycle and supply chain.
Technologie
Ruby on Rails
jQuery
Sidekiq
Postman
R
authO
Docker
Sequel
Zakres obowiązków
-
Implementation of features on the backend and frontend side of the application
-
Preparation API endpoints
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Authentication and Authorization on external application authO
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Ensuring constant monitoring through auditing
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Refactoring legacy code
Gamification badge system for developer activity tracking. A Ruby
on Rails application that monitors developer activities across
GitHub, Slack, and Airtable, automatically awarding digital badges
for achievements based on configurable rules and thresholds
Technologie
Ruby on Rails 8.1,
PostgreSQL,
Solid Queue,
Solid Cache,
Hotwire (Turbo + Stimulus),
ViewComponent,
Vite, Tailwind CSS,
DaisyUI,
Chart.js,
RSpec,
FactoryBot,
Kamal,
GitHub Actions
Zakres obowiązków
-
Designing and implementing a strategy-based badge rule engine with support for GitHub, Slack, Airtable, and manual award sources
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Building asynchronous job pipeline for automated badge checking across multiple data sources
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Integrating with GitHub API (Octokit), Slack API, and Airtable API with retry logic, rate limiting, and caching
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Implementing Slack slash commands and event processing for real-time badge awards
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Developing reusable ViewComponents and statistics dashboard with period-based analytics
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Writing RSpec test suite with N+1 query detection
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Configuring CI/CD pipeline (GitHub Actions) and production deployment via Kamal
Social media platform for athletes supporting Lacrosse, Ice
Hockey, and Field Hockey. The application connects players,
coaches, and teams — enabling statistics tracking, team roster
management, social networking (follows, messaging, posts), event
management, leaderboards, and premium subscription features.
Technologie
Ruby on Rails,
RSpec,
Sidekiq,
Grape,
GraphQL,
Stripe,
AWS S3,
ActiveStorage,
Firebase,
Twilio,
Docker,
PostgreSQL,
Redis,
ActiveAdmin,
Devise,
Kamal
Zakres obowiązków
-
Implementation of features on the backend and frontend side of the application
-
Preparation of API endpoints (REST via Grape)
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Integration with external payment systems (Stripe, Apple In-App Purchases, Google Play)
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Integration with push notification services (Firebase) and SMS (Twilio)
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Image upload and processing (avatar, team logo, event logo) with AWS S3
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Implementation of social features: follows, posts, comments, props, hashtags
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Event management with auto-generated hashtags via admin panel
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Background job processing with Sidekiq (notifications, email digests, reminders)
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Refactoring and maintenance
Field Service Management Platform. An internal web platform for
managing field service operations — tracking service requests,
assigning technicians, coordinating across CRM, orders, production,
warehouse, transport, and collection point modules
Technologie
Ruby on Rails 8.1,
React 19,
TypeScript,
Vite,
Tailwind CSS,
DaisyUI,
PostgreSQL,
Devise,
Pundit,
Solid Queue,
Solid Cache,
Shrine,
AWS
S3,
RSpec,
FactoryBot,
Kamal,
Sentry,
New Relic,
Rack::Attack
Claude
Zakres obowiązków
-
Architecture and development of a multi-module internal platform from the ground up
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Role-based access control system with 9 distinct user roles (Devise + Pundit)
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Interactive admin panel with user management (React + TypeScript)
-
Dashboard with module-level authorization and role-based navigation
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Integration of background job processing via Solid Queue
-
File upload pipeline with Shrine and AWS S3
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Security hardening: rate limiting (Rack::Attack), Brakeman audits, CSRF/XSS protection
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Application monitoring with Sentry and New Relic
-
Deployment automation via Kamal (Docker-based)
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Applying AI-assisted development workflow using Claude Code with custom skill system integrating with Linear ticket management
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Designing and maintaining a structured .ai/ knowledge base — architectural specs, per-domain convention files, and technical guides consumed by AI during development
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Implementing a lessons-learned database to prevent recurring bugs and scope drift across development cycles
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Enforcing Test-Driven Development via AI workflow guardrails
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Conducting AI-assisted compliance checks against ticket acceptance criteria before every merge, using structured verification tables
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Maintaining documentation–code synchronization discipline
