Senior Full Stack Engineer - Checkout & Payments

Accountabilities:

• • Own large, user-facing product initiatives from initial concept and technical design through implementation, launch, measurement, and iteration.
  • Collaborate closely with Product, Marketing, and Design to define the direction of the consumer web experience and translate business objectives into high-quality technical solutions.
  • Build and optimize modern frontend experiences using technologies such as Next.js, React, TypeScript, and Tailwind.
  • Establish and evolve frontend engineering standards, patterns, and development practices across the team.
  • Improve website performance by analyzing rendering behavior, page-load characteristics, Core Web Vitals, and other relevant performance metrics.
  • Develop scalable frontend architecture using component libraries, monorepos, headless CMS platforms, and other modern web development approaches.
  • Design, build, and expand backend APIs and data models that support important product and checkout initiatives.
  • Work across the full technology stack, investigating issues and opportunities from the user interface through backend services and data layers.
  • Experiment with product experiences and use quantitative data to evaluate results, improve conversion, and guide product decisions.
  • Contribute to checkout and payment-related infrastructure, with an opportunity to shape reliable and intuitive payment experiences.
  • Partner with other senior engineers to maintain high technical standards while operating with significant autonomy and ownership.
  • Help evolve the engineering architecture and technical foundation as the product and consumer base continue to grow.

  Requirements

  • Senior-level software engineering experience on high-performing engineering teams, with strong expertise in modern frontend development.
  • Advanced experience with Next.js, React, TypeScript, Tailwind, or comparable technologies.
  • Strong understanding of frontend rendering behavior, particularly within frameworks such as Next.js, and demonstrated ability to optimize page-load performance.
  • Practical experience using Core Web Vitals and related performance metrics to identify and resolve frontend performance issues.
  • Experience building and maintaining large-scale frontend applications using concepts such as component libraries, monorepos, and headless CMS platforms.
  • Strong backend development experience with Python, Django, or comparable technologies.
  • Experience designing, consuming, and extending backend APIs and data models.
  • Ability and willingness to work across the entire stack, from polished user interfaces through backend services and data infrastructure.
  • Strong product mindset and interest in experimentation, conversion optimization, and data-driven decision-making.
  • Excellent communication and collaboration skills, with the ability to work effectively with Product, Marketing, Design, and Engineering stakeholders.
  • Comfortable operating autonomously, taking ownership of ambiguous problems, and driving initiatives from inception to completion.
  • Experience with payment systems or payment infrastructure is a strong bonus.

  Benefits

  • Competitive compensation: Senior Engineering base salary of $175,000–$225,000 USD.
  • Equity/stock options positioned competitively for a Series A startup.
  • Comprehensive medical, dental, and vision insurance.
  • Employer-sponsored HSA contributions.
  • 401(k) plan.
  • Unlimited paid time off.
  • Fully remote work within the United States.
  • Coworking stipend.
  • Learning and development stipend.
  • Two company-wide offsites per year.
  • Two additional team offsites per year.
  • Opportunity to work with a small, highly experienced engineering team and take ownership of high-impact initiatives.
  • The opportunity to contribute to technology aimed at helping consumers invest in preventive health and make greater use of HSA/FSA funds.