Володимир Veteran

Volodymyr Sonin
Ruby on Rails Developer

Khmelnytskyi, Ukraine
Work format: Remote / Office in Khmelnytskyi
Expected compensation: from €1,500/month
GitHub: github.com/SoninVI

tel: [open contact info](look above in the "contact info" section)

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

PROFESSIONAL SUMMARY
Ruby on Rails Developer with commercial experience since 2019, specializing in backend
development, REST APIs, business process automation, CRM and ERP systems.

Experienced with Ruby on Rails 4–8 and production applications using PostgreSQL, PostGIS,
MySQL and MongoDB. Worked with complex business logic, microservice architectures,
background processing, BPMN/Camunda workflows, payment integrations and financial
accounting.

Hands-on experience with legacy systems and Rails upgrades, including participation in a Rails
4 to Rails 5 migration. Experienced in developing new functionality, maintaining existing
systems, investigating production issues and working with distributed business processes.

Technology stack also includes RSpec, Sidekiq, RabbitMQ, Docker, Linux, Nginx, Puma, CI/CD
and cloud platforms such as AWS, Heroku and Microsoft Azure.

TECHNICAL SKILLS
Languages & Frameworks

● Ruby
● Ruby on Rails 4–8
● JavaScript
● Hotwire

● React

Databases

● PostgreSQL
● PostGIS
● MySQL
● MongoDB

Backend & APIs

● REST API
● Background jobs
● Sidekiq
● RabbitMQ
● Business process automation

Testing

● RSpec

Architecture & Development

● Microservices
● BPMN
● Camunda
● Legacy systems
● Rails version migrations
● Complex business logic

Infrastructure & Deployment

● Linux
● Nginx
● Puma
● Docker
● CI/CD
● AWS
● Heroku
● Microsoft Azure

Version Control

● Git

● GitHub

AI & Developer Tools

● Claude
● Claude Code
● Google AI tools

PROFESSIONAL EXPERIENCE
Ruby on Rails Developer — ArchiCGI
2021–2023

Developed and maintained a CRM platform for an architectural 3D visualization company,
covering the complete workflow from customer orders to project execution, acceptance,
payment and contractor payouts.

Responsibilities & Achievements

● Implemented user registration, authentication and role-based access for clients, project
managers and contractors.
● Developed project and task management with nested tasks and contractor assignment.
● Implemented complex business rules for task pricing and contractor compensation.
● Developed a payment model where each role had its own percentage of the task cost,
with a separate platform commission.
● Implemented the workflow for task completion, project manager approval, client approval
and payment.
● Integrated Payoneer to automate payment distribution between contractors and the
platform.
● Developed a financial module supporting accounting according to GAAP principles.
● Worked with complex financial calculations and business rules.
● Maintained and extended a production Ruby on Rails application.

Ruby on Rails Developer — Jet Infosystems
2020–2021

Worked on an ERP/workplace automation system for geospatial and cadastral business
processes.

Responsibilities & Achievements

● Implemented background jobs for complex business processes described using BPMN.
● Worked with Camunda to monitor business process execution and identify workflow
failures.
● Investigated failed business processes and identified the workflow step where an error
occurred.
● Worked within a microservice architecture where different services were implemented
using different programming languages.
● Developed functionality using PostgreSQL and PostGIS for working with geospatial data.
● Participated in a planned migration from Rails 4 to Rails 5.
● Developed new functionality and fixed existing production issues.
● Work distribution was approximately 60% maintenance and bug fixing / 40% new
development.

Ruby Developer — ITSites
2019–2020

Worked on custom web and mobile projects for different clients in an outsourcing environment.

Projects & Responsibilities

● Developed REST APIs for the JUST AGRO mobile applications.
● Developed a multi-user blogging platform.
● Developed a personal account / distributor portal for Dniprometiz.
● Worked on an online store for car keys.
● Developed functionality for a dance studio rental system.
● Worked with different business domains and project requirements.
● Developed and maintained Ruby-based web applications and APIs.

Military Service
2023–2026

Military service.

EDUCATION
Kyiv National University of Culture and Arts
Specialist Degree — Choreography
2010

DEV Academy
Programming Course
2018 · 6 months

LANGUAGES
Ukrainian: Native
Russian: Fluent
English: Elementary (A1–A2); comfortable reading technical documentation
German: Elementary (A1)

ADDITIONAL INFORMATION
● Combat veteran (Ukrainian UBD status).
● Available for remote work.
● Available for office-based work in Khmelnytskyi.
● Expected compensation: from €1,500/month.