Full Stack Engineer

Description

Sunbit builds financial technology for real life.

Our technology eases the stress of paying for life’s expenses by giving people more options on how and when they pay. Founded in 2016, Sunbit offers a next-generation, no-fee credit card that can be managed through a powerful mobile app, as well as a point-of-sale payment option available at more than 25,000 service locations, including auto dealership service centers, optical practices, dentist offices, veterinary clinics, and specialty healthcare services. Sunbit was included on the 2022 Inc. 5000 list.

The financial technology company has also been named a Most Loved Workplace®, Best Point of Sale Company, and a Top Fintech Startup by CB Insights. We use cutting-edge innovations in financial technology to bring leading data and features that allow individuals to be qualified instantly, making purchases at the point of sale fast, fair, and accessible for consumers from all walks of life. We create value focused on our core values; we work tirelessly to ensure that Sunbit becomes available to everyone, everywhere.

We invite you to #UnleashYourCuriosity and join our ever-growing R&D organization.

About the Customer Team

We are seeking a Senior Full-Stack Engineer to join our Customer Squad — a core team dedicated to building innovative, customer-facing solutions that embody the voice and presence of our company. This position offers the opportunity to tackle complex, large-scale system architectures while contributing to products that directly impact our users’ experience.

We value individuals who combine technical excellence with a product mindset — those who see the bigger picture and are eager to help shape the next generation of our customer-facing platforms.

What You’ll Do 

• Design, develop, and enhance service systems to deliver high-quality user experiences and scalable products.
• Solve complex architectural and engineering challenges with creative and effective solutions.
• Collaborate with a multidisciplinary team of engineers, designers, and product managers, while contributing to a culture of support, ownership, and excellence.
• Actively participate in technical discussions, propose ideas, and help shape the technical direction of the team.
• Ensure performance, reliability, and scalability across all layers of the stack—from frontend interfaces to backend infrastructure.
• Write clean, well-documented, and testable code as a core part of your development workflow.
• Own the full software development lifecycle: from planning and design to implementation, testing, and deployment.
• Provide mentorship and technical guidance to junior engineers, encouraging a culture of continuous learning and improvement.

Responsibilities:

• Contribute to the development of our Customer Platforms, ensuring high-quality products and services.
• Solve complex architectural problems, utilizing your deep understanding of system architecture.
• Collaborate with other team members, sharing your expertise and facilitating a culture of learning.
• Maintain our system architecture, ensuring smooth operation and quality user experience.
• Be an advocate for clean, efficient, and maintainable code.

Requirements

• 5+ years of experience in software engineering, with a strong background in both frontend and backend development.
• Proficiency with React (React Native experience is a plus).
• Experience building backend services using Node.js, Kotlin, or Java.
• Hands-on experience with microservices architecture and containerized environments using Kubernetes.
• Solid understanding of cloud infrastructure, preferably with AWS.
• Experience working in high-scale, production-grade environments.
• Excellent problem-solving and system design skills.
• Strong communication and collaboration abilities in a cross-functional team.
• Prior experience in fintech—especially in payment processing or financial services—is a strong advantage.