Senior Front-end Engineer

Toptal

Location
Europe
Job Type
full-time
Salary
Unknown
Posted
July 24, 2025

Job Description

About Toptal

Toptal is a global network of top talent in business, design, and technology that enables companies to scale their teams, on-demand. With $200+ million in annual revenue and team members based around the globe, Toptal is the world’s largest fully remote workforce.

We take the best elements of virtual teams and combine them with a support structure that encourages innovation, social interaction, and fun. We see no borders, move at a fast pace, and are never afraid to break the mold.

Job Summary

You will work on our first-class user experience. We are a product development team and you can expect involvement in where and how the team moves next, and what processes the team adopts and drops. We explore various directions often simultaneously. You can expect autonomy and freedom to lead product, technical, or cultural initiatives.

In our technical stack, we employ Ruby on Rails for back-end and a combination of Apollo, TypeScript, and React for front-end.

This is a remote position. We do not offer visa sponsorship or assistance. Resumes and communication must be submitted in English.

Responsibilities:

The following information is intended to describe the general nature and level of work being performed. It is not intended to be an exhaustive list of all duties, responsibilities, or required skills.

You will build and maintain first-class software used by numerous businesses.

  • Make decisions based on multiple quality dimensions like user impact, failure tolerance, code maintenance, implementation time, security breaches, and performance.
  • Mentor fellow teammates.
  • Collaborate on novel ideas to improve the team processes.
  • Lead initiatives.
  • Care for and monitor the quality of our product.
  • Raise awareness of technical issues.
  • Develop a clear understanding of business value and collaborate with stakeholders by analyzing features and suggesting alternatives.
  • Proactively identify technical debt and product areas that require attention or improvements and suggest improvements in our technology stack.
  • Bring up difficult and/or systemic challenges and impediments to the attention of your manager.

In the first week, expect to:

  • Meet your team members.
  • Get acquainted with our technical stack.
  • Learn about our architecture and the development process.

In the first month, expect to:

  • Attend regular meetings, like technical calls, retrospectives, and the monthly Engineering All-hands meeting.
  • Start working on general team tasks and become familiar with the domain.
  • Start to receive regular feedback from your manager in accordance with the Toptal engineering growth program.

In the first three months, expect to:

  • Settle in and get comfortable with the team processes.
  • Contribute significantly to the application’s development.

In the first six months, expect to:

  • Become a key member of the team and help others inside and outside of the team.
  • Contribute to the planning of large initiatives.
  • Lead technical initiatives within the team.
  • Drive improvements to the codebase and processes.

In the first year, expect to:

  • Mentor and be part of the interviewing processes, to support the growth of our top-skilled engineering team.
  • Lead product initiatives.

Qualifications and Job Requirements:

  • Solid 5+ years front-end experience.
  • Experience in TypeScript, React and HTML are required.
  • React, Apollo GraphQL, TypeScript, and Jest are our front-end stack. The desire to learn and be proficient in them is welcome.
  • Experience with Next.js, monorepo, Progressive Web Apps are strongly preferred.
  • Experience with Ruby on Rails is a plus.
  • Experience with other non-frontend programming languages and technical stacks is welcome.
  • Outstanding written and verbal communication skills.
  • Thriving in autonomy in every aspect of daily work - be able to unblock yourself by finding the right people or help.
  • Being a team player by avoiding solo performances and unblocking your peers.
  • Caring for quality through impactful tests, process change proposals, and raising awareness of issues be them product or technical.
  • Caring for architecture - applying best practices, using software design patterns, and bringing ideas for improvements.
  • Ability to work in a fast-paced, rapidly growing company and handle a wide variety of challenges, deadlines, and a diverse array of contacts.
  • You must be a world-class individual contributor to thrive at Toptal. You will not be here just to tell other people what to do.
For Toptal Use Only: #LI-DNI

🎯 Who is this job for?

This role is ideal for a Senior Frontend Engineer with 5+ years of experience, strong skills in React, TypeScript, and Apollo GraphQL, and familiarity with Next.js and monorepo setups. It suits someone who enjoys leading technical initiatives, mentoring peers, and contributing to product strategy in a remote, fast-paced environment. Experience with Ruby on Rails or Progressive Web Apps is a plus.

πŸ’¬ Potential Interview Questions

  1. How do you ensure maintainable and scalable code in a large React/TypeScript codebase?
    Use modular architecture, reusable components, strict typing, linting, and shared utilities within a monorepo to enforce consistency and reusability.

  2. What are the advantages of using Apollo Client with GraphQL in React applications?
    Apollo simplifies state management, supports caching, handles pagination and subscriptions, and integrates seamlessly with React for efficient data fetching.

  3. How do you approach testing React components with Jest?
    Write unit and integration tests using react-testing-library, mock dependencies where needed, and aim for coverage on logic, interactions, and UI states.

  4. Describe how you would implement a Progressive Web App (PWA) in a Next.js project.
    Enable service workers, manifest files, and offline caching using next-pwa, optimize assets, and ensure the app meets core PWA requirements like responsiveness and HTTPS.

  5. What challenges have you faced when working with a monorepo, and how did you resolve them?
    Common issues include dependency management, build time, and test isolation; solutions include workspaces (e.g., Yarn/Nx), CI optimizations, and modular boundaries.

  6. How do you approach mentorship and code reviews in a distributed team environment?
    Provide constructive, context-rich feedback, pair program when needed, encourage knowledge sharing, and adapt communication to be clear and async-friendly.

  7. How do you handle GraphQL query performance and avoid over-fetching?
    Use fragments to reuse fields, limit fields requested, implement server-side query complexity limits, and cache appropriately with Apollo.

  8. What architectural patterns do you apply in front-end development to ensure quality and testability?
    Apply principles like separation of concerns, dependency injection, presentational/container components, and maintainable state management strategies.

  9. How do you collaborate cross-functionally with product and design in shaping UI/UX decisions?
    Engage early in planning, give technical feedback on feasibility, prototype quickly, and iterate based on team and user feedback.

  10. What’s your strategy for proactively identifying and addressing technical debt?
    Track recurring issues, propose refactors during planning, align with team goals, and balance tech debt reduction with feature delivery through sprint allocation.

πŸ“‹ Job Summary

Toptal is hiring a Senior Front-end Engineer to build first-class software using React, TypeScript, Apollo, and Next.js in a fully remote, fast-paced global team. You'll lead initiatives, mentor teammates, and shape both technical and product direction with autonomy. Ideal candidates have 5+ years of front-end experience and thrive in a high-performance, self-managed environment. Enjoy a remote-first culture, world-class peers, and the chance to make a global impact on scaling businesses.

Required Skills

React Typescript Apollo Unit Testing Next.js

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