Full Stack Engineer

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full Stack Engineer - Checkout & Payments based in the United States.

• 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.

• 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.

• 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.