Senior Engineer, Fullstack - Growth

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Engineer, Fullstack -- Growth based in Brazil.

Join a remote-first engineering team building innovative infrastructure that simplifies global payments and helps businesses optimize their payment operations. As a Senior Fullstack Engineer focused on Growth, you will lead the frontend architecture and technical direction of the self-service onboarding experience, helping merchants move from account creation to their first live payment. You will play a key role in shaping a newly established product area, with significant autonomy over technical decisions and engineering standards. Working closely with Design and Product, you will turn complex requirements into intuitive, high-quality user experiences. You will also mentor engineers, establish best practices, and contribute to backend development when needed. This is an opportunity to make a meaningful impact in a collaborative, globally distributed environment where initiative and technical leadership are highly valued.

Accountabilities:
In this role, you will take ownership of the frontend experience and help shape the technical foundations of the Growth team while collaborating across disciplines to deliver effective onboarding solutions.

• Lead frontend architecture and technical direction for the self-service onboarding journey and platform experience.

• Spend approximately 80% of your hands-on development time on frontend engineering and 20% on backend development, adapting as priorities evolve.

• Collaborate closely with Design to take onboarding and platform concepts from initial ideas through production, ensuring a smooth and intuitive merchant experience.

• Mentor engineers and support the development of frontend skills, engineering judgment, and code quality across the team.

• Establish frontend conventions, architecture review practices, testing strategies, and quality standards for a growing engineering team.

• Contribute to the Python backend when necessary to unblock frontend work or deliver end-to-end features.

• Exercise independent technical judgment, challenge product or design decisions when appropriate, and help define the team's engineering practices in an evolving environment.

• Contribute to a culture of collaboration, continuous improvement, and high-quality product development.

• Requirements:

• The ideal candidate brings strong frontend engineering expertise, proven technical leadership, and the confidence to shape architecture and engineering standards in a team that is still taking form. You should be comfortable working autonomously, mentoring others, and contributing beyond your primary area of expertise.

  • Demonstrated experience architecting and building complex frontend applications in production environments.

  • Strong frontend engineering skills, including the ability to make sound architectural decisions rather than simply implementing existing design systems.

  • Confidence acting as the most senior frontend technical voice on a team, including constructively challenging product and design decisions when technical considerations require it.

  • Some backend development experience and a genuine willingness to work with Python codebases; deep Python expertise is not required.

  • Experience mentoring other engineers, ideally including early-career team members.

  • Ability to work independently, establish appropriate technical standards, and make decisions without relying on extensive guidance.

  • Strong collaboration and communication skills, with the ability to work effectively with Design, Product, and Engineering colleagues.

  • Adaptability and comfort with ambiguity, particularly in a newly formed team where processes and tools are still evolving.

  • Nice to have:

    • Experience building or integrating payment products.

    • Experience working on growth-oriented product experiences, particularly merchant onboarding, activation, or self-service journeys.

    • Benefits:

      • Fully remote work in a globally distributed environment.

      • Competitive share options.

      • Flexible annual leave, with a minimum of 25 days to be taken.

      • Access to coworking spaces across major cities.

      • Company workations and an annual company retreat.

      • High-quality equipment suited to your role.

      • £500 contribution toward your home office setup.

      • Generous learning and professional development budget.

      • Private medical insurance.

      • Additional benefits and perks depending on location.

      • A collaborative, supportive environment with onboarding designed to help employees succeed.

      • The opportunity to influence technical direction and engineering standards in a growing team.