Karol Galanciak
Chief Product And Technology Officer (CPTO) at Smily, formerly BookingSync
Poland
Summary
👤
Senior🎓
Top SchoolKarol Galanciak is a seasoned CPTO and co-founder with 13+ years building scalable web platforms and over 8 years leading high-performing, remote engineering teams in the Short Term Rental space. He combines product and technology leadership to align roadmaps with business outcomes, having scaled engineering to 20+ engineers while growing a distributed Ruby on Rails ecosystem of 29 services and 1500+ Docker containers. Karol drove major efficiency gains—350x faster data sync via Kafka-based CDC, 30% cloud cost reduction through AWS migration, and up to 50% developer productivity improvements using the SPACE Framework—while maintaining PCI DSS compliance. A hands-on engineer and open-source contributor, he’s contributed to notable projects like hutch and ember-cli-mirage and authored Test-Driven Ember, reflecting deep Ruby on Rails and Ember.js expertise. He champions AI adoption (including Claude Code) across product and tech, fosters async remote collaboration, and focuses on developing future leaders while preserving team work-life integration.
13 years of coding experience
13 years of employment as a software developer
Bachelor of Science (BS) Nanotechnologia, Bachelor of Science (BS) Nanotechnologia at Lodz University of Technology
English
Stackoverflow
51reputation
4kreached
2answers
3questions
Github Skills (25)
javascript10
testing10
message-queue10
ruby10
rabbitmq10
ember10
error-handling10
configuration-management9
sentry9
datadog9
rest-api8
rspec8
api-rest8
restful-api8
api-design8
Programming languages (7)
Github contributions (5)
ruby-amqp/hutch
Jan 2021 - Sep 2022
A system for processing messages from RabbitMQ.
Role in this project:
Backend Developer
Backend DeveloperContributions:7 commits, 4 PRs, 2 comments in 1 year 7 months
Contributions summary:Karol primarily focused on improving the configuration and error handling of the Hutch message processing system. Their contributions included enhancing type casting for configuration settings, fixing a typo, and integrating Datadog and Sentry for improved monitoring and error reporting. The user also refactored the Sentry integration to utilize a more modern approach, enabling better visibility into message processing failures.
rabbitmq
miragejs/ember-cli-mirage
Aug 2016 - Jan 2017
An Ember Addon to easily add Mirage JS to your Ember app.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:19 commits, 20 PRs, 2 pushes in 5 months
Contributions summary:Karol primarily contributed to the Ember.js-based frontend and the Mirage.js backend of the project, focusing on enhancing the application's functionality and developer experience. They implemented the `:resource` helper, enabling streamlined CRUD operations, and added YUI documentation to improve code readability. The user also refactored code, implemented traits for factories, and incorporated association helpers, further improving the project's structure and maintainability. Several unit tests were written.
ember-cliember-addonmirage-jsmirageember-app
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