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 and develop backend features and APIs using Ruby on Rails as the primary technology stack.

• Contribute to frontend development in React, including building components and integrating APIs when needed.

• Build scalable backend services and APIs powering applications.

• Develop reusable frontend components and maintain a clean UI architecture.

• Collaborate directly with Product, Design, QA, and DevOps teams to deliver business-focused solutions.

• Improve application performance, reliability, scalability, and maintainability.

• Write clean, production-grade code with strong test coverage (unit, integration, E2E).

• Review code, maintain engineering standards, and support technical decision-making.

• Troubleshoot production issues and support stable deployments.

• Participate in agile delivery processes and contribute to continuous improvement.

• Support knowledge sharing and technical mentorship within the team.

Requirements:

• 6+ years of commercial Ruby on Rails experience.

• Solid entry-level React experience (components, state management, API integration).

• Strong experience building production APIs and backend systems.

• Good knowledge of PostgreSQL and relational databases.

• Experience with RSpec, automated testing, and strong engineering practices.

• Experience with AWS and/or Heroku.

• Understanding of scalable and distributed systems.

• Experience working in Agile teams.

• Strong communication skills in English and Polish at a minimum B2+ level.

Nice to Have:

• Tech Lead or mentoring experience.

• Experience with observability, monitoring, and performance optimization.

• 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.