Sr. Full Stack Engineer

Sunbit • New York, NY

2h • Hybrid

About The Position

Sunbit builds financial technology for real life. Our AI-native platform helps more people get to “yes” at the moments that matter with personalized offers, transparent terms, and no added consumer fees. In stores, practices and service centers across the country, Sunbit provides a fast, fair pay-over-time option. For everything else, the Sunbit Credit Card delivers a modern, no-fee credit experience managed in a powerful mobile app.
We are guided by people-centered values: Serve Others Before Self, Include Always, Connect Genuinely, Innovate for Good. These values shape how we build, how we support customers and merchants, and how we work with each other.
What makes Sunbit different is an AI-native infrastructure that runs through the full customer and merchant journey. Our interconnected AI systems power instant decisioning, streamline fraud checks with human-in-the-loop safeguards, and enable highly personalized offers at scale. The result is a quick, fair, and simple experience for consumers and merchants.
We pair this technology with inclusion and transparency. Sunbit delivers industry-leading approval rates — 90%+ in auto service and 85%+ in dental — while maintaining zero consumer fee-based revenue. It is a better way to serve people and merchants, proven at scale.
Today, Sunbit is available across a nationwide, in-person merchant network of 30,000+ locations spanning auto service centers, dental and optical practices, veterinary clinics, and other specialty services. We help teams say “yes” more often and help customers move forward with confidence.

We're are seeking a Senior Full Stack Engineer to join a team that builds and owns the core platform powering our call center operations- from the agent desktop to the systems behind every customer interaction. Everything we create directly impacts how efficiently we support our customers.
Beyond optimizing the agent experience, the team is focused on driving operational excellence through automation, AI, and intelligent workflows. This includes developing tools that enhance agent productivity, integrating disparate systems across the call center, and implementing AI-driven capabilities that improve both agent efficiency and the overall customer experience.
This is a high-impact role in which engineering solutions directly affect large-scale, real-world operations. The successful candidate will address complex product and platform challenges, operate in a fast-paced environment, and contribute to the strategic development of the technology underpinning Sunbit’s customer success organization.

Requirements

• 5+ years of experience in software engineering.
• Strong frontend development experience, particularly with React and TypeScript.
• Hands-on experience with Kotlin, Java, or Scala.
• Proficiency with the Spring Framework.
• Proven experience in backend software development.
• Experience with both relational databases (e.g., MySQL) and non-relational databases (e.g., MongoDB).
• Skilled in designing and developing microservices architectures.
• Familiarity with message queue technologies such as Kafka, SQS, RabbitMQ, or equivalent.
• Bachelor’s degree in Computer Science or a related field.
• Strong problem-solving abilities and the capacity to tackle complex technical challenges.
• Passion for continuous learning and staying current with industry trends and technological advancements.
• Resourceful, self-motivated, and able to work independently.

Nice To Haves

• Experience in fintech is a significant plus.

Responsibilities

• Design, develop, and maintain the Customer Success agent desktop, the core platform supporting call center operations.
• Build tools, workflows, and integrations that connect multiple systems across the Customer Success organization.
• Enhance agent productivity and operational efficiency through automation, intelligent workflows, and AI-driven capabilities.
• Tackle high-impact product and platform challenges, solving complex operational problems at scale.
• Collaborate closely with Product, Customer Success, Product Lines, and Operations teams to deliver solutions that improve both agent and customer experiences.
• Ensure systems are reliable, scalable, and maintainable, supporting a rapidly growing operational environment.
• Write clean, high-quality code with strong testing, monitoring, and observability practices.
• Take end-to-end ownership of features, from design and architecture to development and production deployment.
• Contribute to a collaborative engineering culture by sharing ideas, improving processes, and mentoring teammates.

Benefits

• Join one of LA’s fastest growing startups (2023), A Most Loved Workplace, #576 on the 2023 Inc 5000 list, and Forbes Fintech 50 (2024), #161 on Deloitte Technology Fast 500 list
• Mission driven + empowered + collaborative
• Competitive pay and stock options
• Unlimited PTO
• Health Insurance options including Medical, Dental, Vision, Life, EAP, FSA, & Maternity Leave
• Newly added HSA and Pet Insurance
• 401K Plan with Matching
• Cell Phone Stipend
• Team based strategic planning + Team owned deliverables

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 101-250 employees