SeniorRubyonRailsDeveloper

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. * Understandi