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Senior Full-Stack Engineer (Ruby on Rails)

Spark Solutions

Warsaw, Masovian Voivodeship, Poland Hybrid permanent

Posted: January 13, 2026

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Quick Summary

We are looking for a Senior Full-Stack Engineer to join our team in Warsaw, Poland. The ideal candidate will be responsible for designing and developing high-quality software solutions, with a focus on Ruby on Rails and ecommerce platforms. Proficiency in a language is required, particularly in Ruby, as well as experience with ecommerce platforms and a strong understanding of the industry.

Job Description

Senior Ruby on Rails Developer

Join our team and work with the best and most ambitious Ecommerce professionals around the world in our Warsaw HQ or 100% remotely.

Spark Solutions is a software house working for global clients (mostly the US, UK and Canada) – ranging from startups to large Fortune 500 corporations. Because of years of our combined Ecommerce experience our team is in a unique position to architect, design, deliver and maintain world-class solutions boosting our clients’ businesses.

We are also the Spree Commerce open-source Core Team. Join us and contribute along with the community of thousands of developers.

We need you to gather technical requirements, architect solutions, estimate timelines, deliver and further develop applications, communicate and investigate, finally… celebrate, reward and promote.

We believe in TDD, agile delivery, and teamwork – automated testing, code reviews, pair programming, professional QA and PM support for our development teams, daily standups, staying in touch using slack or Jira. This way we feel comfortable about our team’s wellbeing and end results for the clients.


Requirements:
Join us if you:

• know and use Ruby on Rails and React.js in commercial projects for at least 2 years
• feel comfortable architecting complex server-side logic and handling data-intensive tasks
• have a "get things done" mindset and take full responsibility for your tasks from start to finish
• have experience or interest in Native integrations: since we are moving towards more native features, experience in this area is a huge plus.
• practice TDD and care deeply about code maintainability
• are proactive in communication – you don't wait for a "nudge" to provide updates or flag blockers
• are fluent in SQL
• communicate fluently in English
• work in agile/scrum
• have been working with 3rd party APIs, performed code reviews and used Docker

Nice to haves:

• Spree Commerce – our ecommerce framework of choice which you’ll have to get familiar with
• Experience leading a team
• Contributions to open-source projects
• Ecommerce experience
• familiarity with ElasticSearch
• familiarity with Hotwire


Benefits:
We offer you:

• Monthly compensation between 4000 - 5000 USD (to your bank account)
• You choose where you work from
• 100% Remote Work
• Our spacious and fully equipped Warsaw office 2 minutes from Metro Świętokrzyska subway station

• Wellbeing
• 20 days of paid annual leave, earned proportionally each month.
• Paid sick leave

• Projects
• Exciting projects for international clients
• Paid Open source work
• Agile project management and QA support

• Toolset
• Best available tools to work with – IDEs, code editors licenses, and other tools
• Modern project tech stacks – we constantly upgrade our projects to keep up with the newest versions of Rails and Ruby

• Growth & Impact
• Peer-to-peer learning: Work closely with our Open Source Core Team and high-level experts
• Code Review Culture: We treat every PR as a chance to share knowledge and maintain top-notch standards.
• Real Influence: You're not just a coder; you participate in architectural decisions and technical strategy.
• Technical Autonomy: We encourage choosing the best tools for the job and staying up to date with the newest Ruby/Rails versions.

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