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Job Title: Senior Full Stack Engineer (Backend-leaning) with EMR Spark Location: Hybrid – Chicago, IL (3 days onsite/week) Type: 6-12 month contract About the Role We’re seeking a Senior Full Stack Engineer with a strong backend focus to join our growing engineering team. In this role, you'll design and build scalable payment systems that power critical transaction processing, fraud detection, reconciliation, and reporting for a leading financial services platform. You will work in a hybrid cloud-native environment utilizing Java, Kotlin, Spring Boot, Kafka, AWS, Amazon EMR, Apache Spark, React, and TypeScript to deliver high-impact solutions across our platform. The ideal candidate is an experienced engineer with deep domain expertise in payment systems and financial technologies , and a passion for solving complex data-driven problems at scale. Responsibilities Design, develop, and maintain backend microservices using Java , Kotlin , and Spring Boot Build and manage data-intensive applications using Kafka , Amazon EMR , and Apache Spark Collaborate with front-end developers to integrate UI components built with React and TypeScript Architect and implement scalable payment workflows, including fraud detection, transaction processing, reconciliation, and reporting Optimize performance and reliability across distributed systems and streaming data pipelines Collaborate cross-functionally with product, data, and DevOps teams to ensure system integrity and seamless deployments Implement and uphold secure coding practices and compliance standards relevant to financial software Participate in code reviews, technical design discussions, and mentor junior engineers Qualifications 10+ years of professional software engineering experience, with a backend emphasis Strong proficiency in Java , Spring Boot , and Kotlin Proven experience with Kafka , microservices architecture , and AWS Hands-on experience with Amazon EMR and Apache Spark for large-scale data processing Solid understanding of payment systems, including fraud detection , transaction management , processing , reconciliation , reporting , and workflow design Frontend development experience using React and TypeScript Background working at a financial institution , ideally a credit card provider Strong problem-solving skills and the ability to communicate technical concepts to both technical and non-technical stakeholders Bachelor’s or Master’s degree in Computer Science, Computer Engineering, or a related field Preferred Qualifications Experience designing systems compliant with PCI DSS and other financial security standards Knowledge of real-time analytics or machine learning integrations for fraud detection Familiarity with observability tools like Datadog, Prometheus, or ELK stack Prior experience in high-throughput, low-latency systems for financial applications

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