Full‑Stack Developer (RoR/React)

• Kernelics- is an international company with development centers in Poland and Georgia. We are passionate about gathering the best IT specialists and building teams for tech startups all over the world.
• If you are also keen on start-ups and innovative projects, if it is important for you to work in a team of professionals and help customers realize their ideas that make this world more convenient, brighter and more technology oriented - Kernelics is definitely your place.

• What are you going to deal with?
• Project:WiddyUP is a fundraising platform where kids create and safely share awesome videos with family and friends in a unique way to raise money.
• Tech stack:Current: Ruby 2.7.1, Rails 6.0.3, PostgreSQL, Sidekiq/Redis, Node/Yarn/Webpack, AWS Elastic Beanstalk.
• Target: modern Rails API, React, React Native/Expo, Stripe, AWS

• Hiring process:
• 🔹HR interview + + tech questions for ROR + React(50 - 60min, Kernelics)

🔹Internal tech ROR + React (optional)

🔹Call with team lead - general questions

• What are you expected to do?
• 🔹Understand the existing Rails application and its production workflows.

🔹Modernize Rails incrementally into a clean API-first backend; no big-bang rewrite.

🔹Build new React web features and APIs reusable by the React Native/Expo app.

🔹Remove or replace legacy code and upgrade outdated dependencies safely.

🔹Work with PostgreSQL, Sidekiq/Redis, Stripe, AWS, and Elastic Beanstalk.

🔹Add tests, review AI-generated code, and ship small, reliable releases.

• What do we expect from you?
• 🔹5+ years of software engineering experience with strong Ruby on Rails and React skills.

🔹Production experience modernizing or upgrading a legacy Rails application.

🔹Strong REST API, PostgreSQL, background jobs, authentication, and authorization knowledge.

🔹Experience with Stripe, AWS, automated testing, CI/CD, and production debugging.

🔹Able to work independently with a technical lead and communicate clearly in English.

Bonus:

🔹React Native/Expo.

🔹Rails/Ruby upgrades and migration from ERB, jQuery, or Webpack to React.

🔹User-generated media, video, fundraising, or K-12 products.

🔹Practical use of Claude Code, Cursor, Copilot, Codex, or similar tools.

• What can we offer?
• 🔹Taking care of your health - fixed benefit health care coverage.
• 🔹 Supporting your active lifestyle - sports activities with 50% coverage up to the fixed amount.
• 🔹 Treating you not only as a team member but as a personality as well - do not even hope that we'll skip your birthday or other significant events in your life, such as a wedding and birth of a child.
• 🔹 Supporting your professional and personal development.
• 🔹 Maintaining work-life balance - you can work from anywhere you wish, flexible working hours within working hours of the project.
• 🔹 Working among your friends - refer our open vacancies to your friends and receive a decent referral bonus.
• 🔹 Enjoying corporate life that is full of bright emotions and impressions - we hold regular online and offline events and activities.

Originally posted on Himalayas