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Senior Fullstack Engineer

AI Summary
Toptal is hiring a senior full-stack engineer with a front-end focus to support the Billing Team's financial operations platforms. The role centers on building and maintaining React and TypeScript applications, Ruby on Rails APIs, and GraphQL integrations. The engineer will lead technical initiatives, contribute to code quality and testing, participate in on-call rotation, and mentor teammates. Success requires at least five years of web development experience, strong independent judgment, and clear collaboration in a fast-moving remote organization.
Remote from
Europe, LATAM
Salary
Undisclosed
Employment
Full Time
Experience
Senior
Published
Apply before
11 Dec 2026
Listing views
35
Application actions
3
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Opportunity details

About this role.

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

The Billing Team is dedicated to building, maintaining, and evolving the technological backbone and functionality that underpin Toptal’s financial operations across all business areas. We’re looking for a full-stack engineer with a front-end focus who is comfortable working across the front-end and back-end, and who is keen to lead initiatives and work closely with our Product team.

By joining the team, you’ll have the opportunity to work on multiple applications, mainly in React front-end and Ruby on Rails back-end. We love TypeScript and Ruby, and heavily use GraphQL for communication between our front-end SPA apps and their back-ends. At Toptal, we push the boundaries of what’s possible every single day, and we’d love for you to be a part of it.

We strive to build performant, scalable, and well-organized apps that are aligned with business goals and non-functional requirements. 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.

  • Write elegant, efficient, and testable React and Ruby code that is easy to maintain and debug.
  • Write, update, and integrate your features with React front-end components.
  • Implement and maintain Ruby on Rails APIs to support seamless communication between front-end and back-end systems.
  • Cover code with tests and perform manual testing of features, while reviewing the work of colleagues.
  • As a true teammate, continuously improve the team’s processes, brainstorm ideas, and communicate statuses and progress.
  • Mentor other people, provide feedback, and grow as a part of the team.
  • Learn new concepts and technologies.

In the first week, expect to:

  • Be introduced to Toptal’s practices and processes.
  • Start participating in company-wide training sessions.
  • Set up your local environment and get familiar with our tech stack.
  • Create your first pull request.

In the first month, expect to:

  • Familiarize yourself with the team’s business domain.
  • Contribute to our product development.
  • Develop a deeper understanding of our technology, processes, and product pipeline.

In the first three months, expect to:

  • Actively supply software planning, development, and maintenance.
  • Suggest and implement improvements to Toptal’s processes and codebase, while exercising discretion and independent judgment.

In the first six months, expect to:

  • Lead technical initiatives in our team.
  • Drive improvements to the codebase and processes.
  • Take part in the on-call rotation.

In the first year, expect to:

  • Have a detailed understanding of Toptal’s technical stack, collaboration rituals, processes, and performance.
  • Mentor Toptal’s new team members.

Qualifications and Job Requirements:

  • 5+ years of web development experience.
  • Proficient in React and TypeScript, capable of integrating front-end components with back-end systems.
  • Have hands-on experience with Ruby on Rails.
  • Have a 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.
  • Consider multiple quality dimensions like user impact, failure tolerance, code maintenance, implementation time, availability, security breaches, and performance.
  • Tackle complex problems but also consider multiple solutions, weigh them, and decide on the best course of action.
  • Be genuinely interested in technology and love to try new things.
  • Strong communication skills, capable of clearly explaining complex concepts.
  • 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.

Compensation

Additional Information

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This job listing has been manually reviewed by the Jobicy Trust & Safety Team for compliance with our posting guidelines, including verification of the company's legitimacy, accuracy of job details, clarity of remote work policy, and absence of misleading or fraudulent content.

Role DNA

A quick view of the complexity, pace, ownership and collaboration implied by the job description.

Job Complexity

5/5
EasyHard

Pace & Pressure

5/5
RelaxedFast-paced

Autonomy Level

5/5
GuidedFull ownership

Communication Load

5/5
IndependentCollaborative
AI insightThis is a senior individual-contributor role spanning production front-end and back-end systems that support core billing operations. It requires technical leadership, sound trade-off decisions, mentoring, quality ownership, and on-call participation in a rapid-growth environment.

Salary analysis

Estimated compensation compared with the broader US market for similar roles.

Estimated job median (per year)Market rate
$110,000
US market range (per year)$90k–$135k
AI insightThe yearly pay period is inferred from the job context; it was not explicitly stated by the employer. No employer base salary was disclosed. The yearly cadence is inferred from the full-time senior engineering role; the displayed USD figures are estimated annual market compensation and may vary substantially by country within Europe and South America.

Core skills

Skills and capabilities most closely associated with this opportunity.

Sample interview questions
How have you designed a React application to remain maintainable as its feature set expanded?

I organize features around domain boundaries, keep shared UI and business logic intentionally separated, define clear TypeScript contracts, and use reusable patterns only after they prove valuable. I also maintain strong test coverage for critical flows and use code reviews to keep conventions consistent.

Describe your experience integrating a React front end with a Ruby on Rails back end using GraphQL.

I define schema contracts around product needs, implement focused resolvers and authorization on the Rails side, and use typed client queries and fragments in React. I monitor query complexity, avoid over-fetching, and add tests for both resolver behavior and critical client states.

How would you approach improving reliability in a billing-related application?

I would first identify high-risk workflows such as invoice generation, payment-state updates, and integrations with external services. I would add observability, idempotency protections, validation, automated regression tests, and safe rollout mechanisms while partnering with product and finance stakeholders to verify business rules.

Tell us about a technical initiative you led without being a people manager.

I start by clarifying the problem, measurable outcomes, constraints, and affected stakeholders. Then I propose options with trade-offs, align the team on a practical plan, deliver incremental improvements, and communicate progress and risks until the initiative is fully adopted.

How do you balance delivery speed with code quality in a fast-paced environment?

I distinguish between reversible and high-risk decisions, ship small well-tested increments, and prioritize safeguards around critical paths. When shortcuts are necessary, I document the debt, create a follow-up plan, and make the trade-off visible so speed does not silently compromise reliability.

This analysis is generated from the job description. Salary estimates, role characteristics and sample answers are guidance, not employer-provided facts.
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