Senior Full-Stack Engineer (Remote) - Lead & Mentor

Toptal; Poland; Remote; PLN 357,000 - 555,000; Full time

Job summary

Toptal is seeking a senior full-stack engineer with a frontend focus to join the Billing Team. You will work across React and Ruby on Rails, building scalable features and integrating front-end with backend services. Proficiency in TypeScript and GraphQL will be essential in delivering fast, reliable user experiences.

This is a remote position. We value initiative, collaboration, and the ability to mentor others while delivering high-quality software in a dynamic, fast-growing environment.

Qualifications

• 5+ years of web development experience.
• Proficient in React and TypeScript, capable of integrating front-end components with back-end systems.
• Hands-on experience with Ruby on Rails.
• Demonstrable understanding of back-end and development principles, databases, clean code, and best testing practices.
• Proactive and adaptable, able to lead projects and work effectively within cross-functional teams.
• Strong communication skills and ability to work in a fast-paced environment.

Responsibilities

• Write elegant, efficient, and testable React and Ruby code that is easy to maintain and debug.
• Integrate front-end components with React frontend.
• Develop and maintain Ruby on Rails APIs to support communication between frontend and backend.
• Write tests and perform manual testing; review colleagues’ work.
• Lead initiatives, mentor teammates, and contribute to process improvements.

Skills

React

TypeScript

Ruby on Rails

Web development

Testing practices

Tools

GraphQL

Job description

Toptal is seeking a senior full-stack engineer with a frontend focus to join the Billing Team. You will work across React and Ruby on Rails, building scalable features and integrating front-end with backend services. Proficiency in TypeScript and GraphQL will be essential in delivering fast, reliable user experiences.

This is a remote position. We value initiative, collaboration, and the ability to mentor others while delivering high-quality software in a dynamic, fast-growing environment.