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.
What You’ll Do:
Sunbit is looking for a Senior Backend Infrastructure Engineer to join our Infrastructure Group, the team responsible for building and scaling the shared services and core systems that power Sunbit’s entire engineering ecosystem.
As part of the Infrastructure Group, you will play a critical role in providing the backbone of Sunbit’s technology, enabling development teams to move faster, more reliably, and more efficiently.
You will lead the design and implementation of cross-team services, accelerate the work of product and platform teams, and act as a pivotal force in driving complex, high-impact technical initiatives across the organization.
This is a hands-on engineering position that blends deep technical expertise with leadership, delivering robust and scalable infrastructure solutions that directly influence the success of Sunbit’s core products.
Responsibilities:
Own and Scale Core Services - Design, develop, and maintain reliable, high-performance, and highly available backend services used across Sunbit’s engineering teams.
Advance Backend Infrastructure & Tooling - Continuously evolve our engineering foundations — from CI/CD frameworks to internal tooling — improving development velocity, observability, and system reliability.
Drive Cross-Team Technical Initiatives - Collaborate with product, platform, and backend teams on strategic projects. Serve as a force multiplier by enabling feature teams through shared infrastructure and backend leadership.
Lead Innovation and Technical Direction - Champion innovation in tooling, architecture, and best practices. Lead the adoption of new technologies and modern approaches to future-proof Sunbit’s infrastructure.
Requirements
- 8+ years of backend development experience, primarily with JVM-based stacks (Java/Kotlin).
- Proven track record as a technical leader, enabling and accelerating the work of others.
- Expertise in building core infrastructure services, internal tooling, and shared backend frameworks.
- Deep experience with microservices, cloud-native architecture (preferably AWS), and Kubernetes orchestration.
- Strong command of both SQL and NoSQL databases, including designing for scale and performance.
- Proficient in asynchronous communication patterns, including production use of Kafka.
- Solid grasp of Domain-Driven Design (DDD) principles and their practical application.
- Experience designing and securing scalable REST APIs.
- History of introducing new frameworks and technologies that improve engineering outcomes.
- Excellent collaboration and communication skills across engineering disciplines.
Preferred Experience
- Deep hands-on experience with the AWS ecosystem
- Proficiency in the Spring Framework and building production-grade backend services
- Experience with event streaming platforms (Kafka or similar)
- Background in payment systems or financial services
- Collaboration with Machine Learning teams and integration of ML features into production systems
- Strong Kubernetes expertise — from architecture to deployment and workload management
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What We Do
Sunbit is the preferred buy now, pay later technology of service providers and retailers fulfilling the needs of thousands of local communities. Sunbit eases the stress of buying everyday things by offering access to fast, fair and transparent payment options to people across the credit spectrum. Sunbit technology is offered in-store and online through more than 7,300 locations, including 1 in 4 auto dealership service centers, optical practices, dentist offices and specialty health care services. Payment options through Sunbit can be found at these establishments www.sunbit.com/shop-directory
Loans are made by Transportation Alliance Bank, Inc., dba TAB Bank, which determines qualifications for and terms of credit.
Why Work With Us
Sunbit technology is used to reduce the stress from daily purchases by helping shoppers realize the full potential of their buying power while providing local businesses with tools to sell easier. With experts in machine learning, retail, and financial services, we’re trailblazing new technology that helps lenders open the door to fair financing.
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