Senior Ruby on Rails Developer

About us

LLInformatics is a forward-thinking IT consulting firm, trusted by clients across Europe and North America. We specialize in delivering complex projects on time, with exceptional quality, and always meeting the highest compliance standards. Our remote-first team of 130+ experts is passionate about building cutting-edge digital products that drive real results. With a focus on data-driven decisions, measurable outcomes, and a strategic mindset, we’re raising the bar in our industry—backed by a strong, collaborative work culture that fuels our success.

• Contract Type: B2B

• Location: Remote or in our Warsaw office
  

Your Tasks and Responsibilities:

• Design, develop, and own complex backend features and APIs using Ruby on Rails.

• Architect scalable, reliable, and maintainable backend services.

• Collaborate closely with Product, QA, DevOps, and business stakeholders to translate requirements into technical solutions.

• Drive improvements in system performance, scalability, reliability, and engineering quality.

• Write clean, production-grade code with strong automated test coverage.

• Review code, establish engineering standards, and contribute to architectural decisions.

• Troubleshoot complex production issues and support stable, efficient deployments.

• Participate in agile delivery processes and drive continuous improvement initiatives.

• Mentor other engineers and actively contribute to knowledge sharing within the team.
  

Requirements:

• 6+ years of commercial Ruby on Rails experience.

• Strong experience designing and building production-grade APIs and backend systems.

• Advanced knowledge of PostgreSQL, database optimization, and data modeling.

• Strong experience with RSpec, automated testing, and engineering best practices.

• Experience with AWS and/or Heroku.

• Good understanding of distributed systems, scalability, and system architecture.

• Experience working in Agile environments.

• Strong communication skills in English (B2+) and Polish (B2+).

Nice to Have:

• Technical leadership or mentoring experience.

• Experience with observability, monitoring, and performance optimization.

• Experience participating in architectural discussions and technical decision-making.

• Experience working directly with international stakeholders.
  

Why join us? 

• Flexible Working Hours – We focus on results! Manage your time, keep your team informed about your availability, and attend key meetings.

• Work from Anywhere – Choose your ideal setup! Work 100% remotely within the EU, go hybrid, or enjoy our Warsaw office, fully equipped for productivity.

• Comprehensive Onboarding – From day one, we ensure you feel comfortable and supported, so you can quickly become part of the team.

• Flat Structure – We value initiative and open communication. Every voice matters here!

• Positive Company Culture & Team Spirit – We create an environment where everyone feels appreciated and comfortable.

• Modern Work Methods – We use cutting-edge project management techniques inspired by the IT world.

• Transparent Communication – Regular 360° feedback sessions and mentor support to help you grow.

• Top-Notch Equipment – Get a MacBook for your work. If you choose to work from our Warsaw office, you'll also have access to a 34” (16:9) widescreen monitor and an ergonomic standing desk.

• Weekly English Lessons – Optional classes with a native speaker to help you improve your skills.