Periakaruppan Vellayappan
Sr Engineering Manager @American Express
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WORK HISTORY
Sr Engineering Manager @American Express
Phoenix, AZ, US
EDUCATION
Anna University Chennai
Bachelor's degree, Computer Science
SKILLS
ABOUT PERIAKARUPPAN VELLAYAPPAN
Dynamic Senior Engineering Manager with 20 years of experience leading high-impact engineering teams to build cloud-native, highly available, and real-time distributed systems in FinTech. Proven expertise in architecting large-scale microservices, driving modernization efforts, and scaling enterprise-grade platforms that handle millions of transactions with low latency, high resilience, and security.A strategic and hands-on technology leader who excels in engineering execution, product innovation, and talent development, fostering a culture of ownership, automation, and continuous learning. Expertise at navigating complex technical challenges, aligning engineering roadmaps with business growth, and leading global cross-functional teams in high-stakes, mission-critical environments.Key Achievements & Expertise Engineering Leadership & Business Impact – Led high-performing global teams to successfully launch of Credit card and Banking digital experiences. GenAI Transformation – Led delivery of enterprise-scale GenAI use cases, from proof-of-concept to pilot enablement, using agentic frameworks and LLM integrations.Built internal AI Agents, chatbots that accelerated engineering workflows and knowledge access. Expertise in Github Copilot chat, Devin, Microsoft copilot studio. Cloud-Native, Scalable Architecture – Designed and built resilient, event-driven microservices architectures using Kafka optimizing systems for ultra-low latency, high availability (99.99%), and real-time transaction processing. API-First & High-Throughput Systems – Developed and optimized GraphQL APIs and RESTful microservices to support millions of daily requests, powering omnichannel ecosystems. Scalability & High-Performance Computing – Led modernization efforts for legacy banking systems, transforming monolithic architectures into cloud-native, containerized microservices with horizontal scalability, reducing latency. Talent Development & Engineering Culture – Mentored, recruited, and developed top-tier engineering talent, driving adoption of Kotlin, GraphQL, AWS and cloud-native best practices. Served as promotion panelist, campus recruiter, presented in tech conferences within the organization. Core Tech Stack: Java, Kotlin, Gen AI, Langchain, Langgraph, Github copilot, Working with LLMs(GPT, Gemini, Claude, llama), AWS, GCP, GraphQL, Spring, Kafka, React.js, MongoDB, Redis, Couchbase, Elasticsearch, Docker, Kubernetes Certifications: AWS Certified Solutions Architect | Sun Certified Java Programmer
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