Backend Developer (Data Layer / API Specialist)

Position Overview Keystone AI is looking for a Backend Developer (Data Layer / API Specialist) responsible for designing, building, and maintaining scalable backend services and data interfaces that power digital experiences, analytics, and personalization platforms. This role focuses on API development, data ingestion and transformation, and secure, high-performance integration between upstream data sources and downstream applications. The Backend Developer will work closely with frontend engineers, data engineers, analytics teams, and platform architects to ensure reliable, well-governed data flows and performant backend services. Location: Remote, US Key Responsibilities Backend & API Development Design and develop RESTful and/or GraphQL APIs to expose data and business services. Build backend services that support real-time and batch data access. Ensure APIs are scalable, resilient, and well-documented (OpenAPI / Swagger). Data Layer Engineering Implement data ingestion, transformation, and orchestration services. Integrate with databases, data warehouses, and event streams. Optimize data access patterns for performance, reliability, and cost. Integration & Platform Enablement Integrate backend services with third-party platforms including CDPs, analytics, CRM, CMS, and marketing platforms. Support identity, consent, and data-governance requirements at the API layer. Enable downstream consumers including web, mobile, call center, and analytics teams with clean, consistent data interfaces. Security, Reliability & Performance Implement authentication, authorization, and API security best practices. Monitor and tune backend services for performance and availability. Build logging, error handling, and observability into all services. Collaboration & Delivery Partner with frontend, analytics, and data engineering teams on end-to-end solutions. Participate in architecture reviews and contribute to backend standards. Support CI/CD pipelines and infrastructure-as-code workflows. Required Skills & Experience Technical Skills Strong experience with backend languages such as Java, Python, Node.js, or Go. Hands-on experience building and consuming REST and/or GraphQL APIs. Solid understanding of SQL and NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB, DynamoDB). Experience with data pipelines, ETL/ELT, or event-driven architectures. Familiarity with cloud platforms (AWS, Azure, or GCP). Data & Integration Experience integrating with analytics, CDP, CRM, or marketing platforms. Understanding of data modeling, schemas, and data quality best practices. Knowledge of identity, consent, and data privacy considerations is a plus. Engineering Practices Experience with CI/CD pipelines, Git-based workflows, and automated testing. Familiarity with containerization and orchestration technologies such as Docker and Kubernetes preferred. Strong troubleshooting and performance optimization skills. Preferred Qualifications Experience working in MarTech, analytics, or personalization ecosystems. Exposure to real-time streaming technologies such as Kafka, Kinesis, or Pub/Sub. Familiarity with API gateways, service meshes, or microservices architectures. Experience supporting enterprise-scale data platforms. Compensation The base salary range for this position is $75,000 – $110,000 annually . Actual compensation may vary depending on experience, qualifications, geographic location, and other job-related factors. About Keystone AI Keystone AI , a business unit of Infosys Nova Holdings, LLC, is a digital experience partner helping global brands design, build, and optimize the future of customer engagement. We blend data, design, and technology to deliver connected commerce and content solutions that drive measurable results. Specializing in the Adobe Experience Cloud, we provide end-to-end services across commerce, content, analytics, and customer insights. Backed by Infosys, we’re growing fast—and we’re looking for exceptional talent to grow with us. Our teams work at the intersection of strategy and execution—solving complex challenges for industry leaders in healthcare, retail, manufacturing, and beyond. From large-scale digital transformation programs to platform implementations and ongoing optimization, we bring deep expertise and a collaborative mindset to every engagement. Why Join Us? Keystone AI is a place for curious thinkers, smart builders, and digital pioneers. We’re more than a consultancy—we’re a team of innovators helping the world’s top brands shape the future of digital. Here, you won’t just contribute to a project—you’ll drive meaningful outcomes, collaborate with cross-disciplinary teams, and grow your skills in a high-impact, high-growth environment. We believe great work starts with great people, and we’re committed to creating a culture where talent thrives, ideas spark change, and results speak for themselves. If you’re ready to push boundaries, deliver real value, and help shape the next generatio