Alexander Shestopaliuk — Software Engineer

Expertise in Back-End Web (5.0 yr.), Full Stack Web (5.0 yr.).

Last verified on August, 2026

Core Skills

Bio Summary

Over 6 years of experience in software engineering with a strong focus on Ruby and Ruby on Rails, delivering backend solutions in finance, e-government, and construction domains.
Expertise in building and optimizing GraphQL APIs, asynchronous processing with RabbitMQ, and integrating AWS S3 for file management.
Proficient in test-driven development using RSpec, improving code quality, reducing technical debt, and maintaining microservices architectures.
Skilled in PostgreSQL, Redis, RESTful services, and infrastructure collaboration, ensuring high reliability and performance in production environments.

Technical Skills

Programming Languages	JavaScript, Ruby
.NET Platform	ASP.NET Core Framework
Ruby Frameworks	Ruby on Rails
Databases & Management Systems / ORM	PostgreSQL, Redis
Amazon Web Services	AWS S3
Version Control	Git
SDK / API and Integrations	GraphQL
Soft Skills	Mentor Aptitude
Methodologies, Paradigms and Patterns	microservices architecture, REST
Message/Queue/Task Brokers	RabbitMQ
QA, Test Automation, Security	RSpec

Work Experience

Software Engineer (Financial project)

Duration: June 2023 - present
Summary: A finance domain project focused on developing and maintaining backend services to support complex financial operations and integrations with third-party financial services.
Responsibilities:

Developed and maintained backend services using Ruby.
Built and optimized GraphQL APIs with complex business logic.
Implemented asynchronous processing with RabbitMQ.
Integrated and maintained third-party financial services.
Improved internal Ruby libraries and reduced technical debt.
Increased test coverage using RSpec and improved reliability of critical flows.
Implemented file storage and management using S3 buckets.
Refactored legacy code and optimized performance bottlenecks.
Supported production environment and resolved critical incidents.
Collaborated on infrastructure and deployment processes.

Technologies: Ruby (2.x), Ruby on Rails (6–7), GraphQL, RabbitMQ, RSpec, PostgreSQL, Redis, AWS (S3), REST, Git

Ruby Back-end developer - P2H (E-government projects)

Duration: Feb 2021 - July 2023
Summary: E-government projects under NDA involving development and maintenance of microservices architecture to support government digital services.
Responsibilities:

Implemented many new features.
Supported production environments.
Covered codebase with tests.
Maintained features in custom gem.
Worked and maintained microservices architecture using various technologies and gems.

Full-stack Ruby & JS Developer - Greenbadger LLC – Nortapartners (Construction project to manage and calculate structure waste, materials etc.)

Duration: July 2019 - Apr 2021
Summary: A construction industry project aimed at managing and calculating structural waste and materials to optimize resource usage and project efficiency.
Responsibilities:

Supported production environment.
Implemented many new features.
Refactored legacy code and improved code quality.
Increased request speed.
Mentored 2 junior developers.

Full-stack Ruby & JS Developer - Freelance (VPN service and an online store)

Duration: Sep 2017 - July 2019
Summary: Long-term freelance projects including a VPN service and an online store, both developed using Rails 5 with JavaScript.
Responsibilities:

Developed and maintained projects using Rails 5 and JavaScript.

Technologies: Rails 5, JavaScript

Education

Nicolaev University
Ukraine
2014 - 2017
ONPU
Bachelor degree
2017 - 2019
Computer Academy “Step”
Learn C, C++, HTML, CSS, JS, C#, .NET, ASP, Data Structures
2014 - 2019

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