Denis

Denis Oster
Software Engineer
[открыть контакты](см. выше в блоке «контактная информация») | @denis_oster | [открыть контакты](см. выше в блоке «контактная информация») | [открыть контакты](см. выше в блоке «контактная информация»)

SKILLS

• Ruby, Elixir, Node.js, JavaScript, TypeScript, CoffeeScript, Lua, SQL, PL/pgSQL
• RubyOnRails, Phoenix, Hotwire, jQuery, React, Backbone.js, Marionette.js, ActiveAdmin
• PostgreSQL, SQLite, Redis, ClickHouse
• PGQ, RabbitMQ, Delayed::Job, Sidekiq
• JSON:API, WebSocket, gRPC, AnyCable
• RSpec, Capybara, OpenAPI, Swagger, Rubocop, Audit
• Docker, Kubernetes, GitLab CI, Github Ci, Jenkins
• S3, Linux, Nginx, CloudFlare, Minio
• Stripe, Sentry, Kibana, Elasticsearch

S U M M A RY

My professional development experience spans 7 years, covering work on small projects 'from scratch' as well as large-
scale projects with high load and complex business logic. I have experience in both individual application development
and teams of up to 20 people. I have experience working as a team lead.

English - Pre-Intermediate, Ukrainian - Native, Russian - Native
EXPERIENCE

Software Engineer Feb 2023 - Jul 2023
HEALTH24.UA
I was involved in creating MVPs for the European market.
• Assembled a development team
• Created the architecture of the future system
• Organized work processes
• Configured CI/CD pipelines

Software Engineer May 2022 - Aug 2022
Transinet GmbH
I worked in a product logistics company, where my task was to provide expert analysis of the current project status.
• Update the project to its current state
• Identify vulnerabilities and weaknesses in the system
• Assembled a development team
• Provide recommendations for forming a new development team
Software Engineer Jan 2019 - Jan 2022
DIDWW
My work in a product company involved developing and implementing Voice and SMS solutions for businesses and
telecommunications operators. I participated in the development of public projects such as DIWWW, phone.systems,
call.center, telecom.center, as well as internal projects for technical specialists.
• Working with legacy code
• Codebase modernization
• Code reviews
• Utilizing PGQ
• Comprehensive code testing coverage
• Application design
• Application development
• Integration with external services
• Application deployment
• Bug and vulnerability discovery
• Rails::Engine
• Project documentation
• ActiveAdmin

Software Engineer Jan 2018 - Dec 2018
Roonyx
I've been involved in both proprietary developments like Orcheya and DealerPoint, as well as commissioned projects such
as Pivotal Tracker and Geotourist.
• Application design
• Application development
• Integration with external services
• Application deployment

Software Engineer Apr 2017 - Dec 2017
Leets
I was involved in building internet stores and CRM systems from scratch, offering a comprehensive range of services.
• Application design
• Application development
• Server configuration
• Application deployment
• Support for ensuring uninterrupted project operation

E D U C AT I O N

Bachelor’s, Odessa National Academy of Food Technologies Jun 2019
Computer science