Contract Senior Software Engineer (Java Spring)

About the Company: Stable Kernel is a technology services firm and custom software developer building scalable software solutions for cutting-edge, innovative enterprises to move their business forward. We are headquartered in Atlanta, GA. We’re a privately held, Great Place to Work Certified Company™ with a multi-award-winning culture and an impressive 10-plus-year trajectory of sustainable growth. At Stable Kernel, we support our employees in ways that help them do some of the best work of their lives. About the Role: As a Stable Kernel Contract Senior Software Engineer , you play an essential role in setting our portfolio of world-class clients up for success through the development and delivery of their most innovative, transformational initiatives. You will collaborate daily with other engineers and product team members, make decisions that influence the path of a product roadmap, leverage software development best practices, and become a more well-rounded engineer as you learn new technologies. Your knowledgeable practice, reliability, and consultative nature make you an engineer that stakeholders and teammates trust. Core Responsibilities Include: Technical Impact: Design and implement loyalty engine services in Java using the Spring framework, including transaction processing, tier calculation, reward accrual, and benefit eligibility. Design and implement RESTful API services in Java using the Spring framework, following contract-first development practices, with a focus on aggregation patterns, caching strategies, circuit breaking, and graceful degradation for latency-sensitive flows. Modern Java (17+) and familiarity with current Spring Boot conventions, including reactive patterns where appropriate. Cloud platform experience (AWS, GCP, or Azure), including service deployment, networking fundamentals, and managed services such as queues, caches, and databases. Identity and access management protocols such as OAuth 2.0, OIDC, and SAML, including integration