Kamil Dubel, Developer in Bielsko-Biala, Poland
Kamil is available for hire
Hire Kamil

Kamil Dubel

Verified Expert  in Engineering

Software Developer

Bielsko-Biala, Poland

Toptal member since February 17, 2025

Expertise
RubyRuby on RailsAgile DevelopmentGitJSONGraphQLDatabaseREST APISQLPostgreSQLCSSJira
Bio

Kamil is a senior back-end engineer with experience across medtech, eCommerce, transport, and catering. He excels at building scalable, reliable systems tailored to diverse industry needs. Focusing on problem-solving and collaboration, Kamil delivers innovative solutions that drive efficiency and meet complex business goals.

Portfolio

Toptal
Ruby, Ruby on Rails (RoR), Bash, Agile, Jira, Miro, Atlassian Suite, Git...
The Masters
Ruby on Rails (RoR), Ruby, JavaScript, HTML, Docker, PostgreSQL, SQL, APIs...

Experience

  • Ruby - 13 years
  • Agile - 13 years
  • Git - 13 years
  • Ruby on Rails (RoR) - 13 years
  • Databases - 13 years
  • REST APIs - 11 years
  • JSON API - 10 years
  • GraphQL - 5 years

Availability

Part-time

Preferred Environment

Ruby, Ruby on Rails 6, Ruby on Rails 7, Ruby on Rails (RoR), GraphQL, GraphQL API, JSON, JSON API, REST, REST APIs

The most amazing...

...management system I've built catered to the company's requirement to limit the number of employees needed by 30%.

Work Experience

Senior Back-end Engineer and Engineering Manager

2019 - 2024
Toptal
  • Developed client portal features used by Toptal's clients.
  • Created and managed a developer experience team that served scripts and tools to 500+ engineers.
  • Extracted a billing functionality from a monolith solution to a separate service.
  • Prepared the back end with GraphQL API ahead of the new React stack implementation and platform transformation.
Technologies: Ruby, Ruby on Rails (RoR), Bash, Agile, Jira, Miro, Atlassian Suite, Git, GraphQL, React, GraphQL API, SQL, PostgreSQL, JavaScript, Design Patterns

Senior Back-end Engineer

2014 - 2019
The Masters
  • Built a catering system for industrial workers, streamlining meal ordering and delivery processes for a high-volume workforce.
  • Developed an app for performing Cardiotocography (CTG) from home, enabling remote fetal monitoring for safer, more accessible prenatal care.
  • Built a social/event mobile app tailored for a selected group of people, enhancing their ability to attend events through personalized features and streamlined user experience.
  • Developed an app for a freight forward company, streamlining logistics and shipment tracking processes to improve efficiency and real-time updates for customers.
  • Managed the development of an apartment booking system, improving the user experience with seamless reservations, payment integration, and real-time availability tracking.
  • Built an app for creating personalized diets based on user metrics, leveraging data-driven algorithms to generate customized meal plans and track nutritional goals.
Technologies: Ruby on Rails (RoR), Ruby, JavaScript, HTML, Docker, PostgreSQL, SQL, APIs, JSON API, REST, REST APIs, CSS, Bootstrap, Design Patterns, Ruby on Rails 5

Experience

Toptal's Client Portal

This project involved contributing to a full-stack app for Toptal's clients, covering the entire journey from onboarding to hiring, leveraging React, Ruby, and GraphQL. I assisted in developing new features, optimizing functionalities, and resolving bugs to enhance the app's performance and user experience.

Education

2011 - 2014

Bachelor's Degree in Computer Science

University of Wrocław - Wrocław, Poland

Skills

Libraries/APIs

GraphQL API, JSON API, REST APIs, React

Tools

Jira, Atlassian Suite, Git, Miro

Languages

Ruby, GraphQL, Bash, SQL, HTML, CSS, Embedded C, JavaScript

Frameworks

Ruby on Rails 6, Ruby on Rails 7, Ruby on Rails (RoR), Ruby on Rails 5, Bootstrap

Paradigms

Agile, REST, Design Patterns

Storage

JSON, Databases, PostgreSQL

Platforms

Docker

Other

Algorithms, Computer Science, APIs

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring