Selvaraj Kannaiyan

Senior Full Stack & Cloud Architect

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Wiesbaden, Germany

Experience

Oct 2021 - Aug 2025
3 years 11 months
Wiesbaden, Germany

Senior Full Stack & Cloud Architect

HCLTech

  • Led end-to-end implementation of the Miles and More Credit Card Service integrating with TSYS systems on Microsoft Azure
  • Architected secure, scalable APIs and microservices using Spring Boot, Camunda, and Apache Kafka (Confluent Platform) for real-time event streaming and process automation on Azure Kubernetes Service
  • Managed full development lifecycle of the credit card system on Azure Cloud including fraud detection, payment processing, account management, and Kafka-based event-driven data pipelines
  • Designed and implemented Kafka Connect integrations and Schema Registry for seamless data flow between microservices and legacy systems
  • Introduced Agile best practices, improving team efficiency by 30% and reducing project delivery time
  • Directed and mentored a team of 15+ developers fostering a collaborative, cloud-first, and innovation-driven culture
  • Managed client relationships achieving 95% satisfaction and securing follow-up projects through consistent delivery excellence
  • Designed and deployed BPMN/DMN models in Camunda for complex business workflows and automation
  • Configured Camunda Engine with advanced features such as error handling, RPA integration, and multi-version deployments
  • Integrated Camunda and Kafka-based messaging with core banking systems ensuring high availability and data consistency
  • Managed multi-database schema configurations on Azure and optimized system performance for high throughput and fault tolerance
  • Designed and implemented cloud architecture patterns on Azure focusing on multi-region resilience, data sovereignty, and event-driven scalability for critical financial workloads
Aug 2019 - Oct 2021
2 years 3 months

Senior Consultant

Capgemini

  • Developed a digital platform for Alert Breach Management in the FX/FI trading system leveraging Camunda workflow engine, Spring Boot, Apache Kafka, and Oracle for real-time monitoring and automated rule-based alerting
  • Served as full stack developer covering analysis, design, development, and unit testing for a scalable microservices architecture with a ReactJS SPA front end integrated with AEM and deployed on AWS Cloud
  • Implemented second-level ID validation for traders using Camunda Process APIs and workflow rule automation ensuring compliance and operational efficiency
  • Utilized Camunda BPMN, Kafka-based event streaming, Spring Boot, and PingID for secure authentication with a ReactJS back-office application consuming REST APIs and gRPC services (Golang) protecting Keycloak-based identity systems
  • Deployed and managed microservices on AWS using Docker ensuring high scalability, resilience, and maintainability of trading operations
Dec 2017 - Aug 2019
1 year 9 months

Technical Architect

Verizon

  • Developed ATOM services to establish a digital platform for B2B & C2C e-commerce portal with backend services including address qualification, product API, cart API, number portability, credit check, payment gateway integration, and order submission using ReactJS within an AEM cloud single-page component-based architecture
  • Designed a single-page ATOM architecture for an e-commerce online web portal encompassing various telecommunication products
  • Developed microservices based on Golang gRPC employing protobuf for efficient network communications across multiple channels
  • Designed and integrated common REST and SOAP web services with HTTP, JMS, and MQ in Kafka following a hub-and-spoke architecture to integrate front-end channels with the in-house offer engine CRM
  • Devised a real-time interface solution for address verification using Ping products and integrated customer management repository with Elasticsearch
  • Defined Camunda workflow rules implementing HTTP connectors, expressions, and Java for the end-to-end ordering application process
  • Architected AWS cloud platform infrastructure for numerous microservices deploying with effective versioning techniques (jgitflow) and enabling graceful shutdown and restart with AWS Lambda
Jan 2017 - Dec 2017
1 year

Assistant Manager

Citicorp Services India Ltd.

  • Developed an analytical platform for Fundamental Review of Trade Book using multiple Spring Boot services with a document-based database and Kafka for FRTB apps such as DataRecon, Data Transform, and DataSync
  • Implemented a ReactJS-based grid mechanism for multi-sort filtering on trade data with server-side pagination
  • Provided end-to-end design solutions and change specifications for Fundamental Review of Trade Book for foreign exchange and investment
  • Developed big data analytical microservices to assess trader and investor risk using trade schemas
  • Created data-transform and data-reconciliation APIs to calculate trader and bank risk
  • Developed Spring Boot microservices with Swagger API documentation using Couchbase and Kafka Confluent, Apache Storm
Apr 2015 - Jan 2017
1 year 10 months

Software Engineer

Royal Bank of Scotland

  • Implemented LMMS providing authentication to RBS internet banking resources with Retail 4p and SSL for partial PIN and password verification and token generation
  • Developed F-SSO enabling single sign-on across multiple systems using SAML protocol, allowing users to authenticate once per session and access all authorized services without re-login
Jul 2011 - Sep 2014
3 years 3 months

System Engineer

IBM India Private Limited

  • Served as application developer on the Referential Data System team for Bank of America monitoring and reporting health of BOA applications
  • Developed multiple rules based on application logs to detect errors, issues, and performance problems
  • Designed a dashboard updated every 8 hours to monitor application status, errors, memory issues, and performance for support teams

Summary

Senior Full Stack & Cloud Architect with over 14 years of experience designing, developing, and deploying resilient, event-driven software solutions across financial and enterprise domains. Skilled in Java, Python, ReactJS, Camunda BPM, AWS, and Microservices, with 5+ years of hands-on expertise in Apache Kafka (Confluent, AWS MSK, and open-source distributions). Proven ability to architect secure, scalable, and streaming-based cloud platforms, focusing on data sovereignty, operational resilience, and multi-cloud strategies to reduce vendor lock-in and geopolitical risks.

Experienced in implementing real-time data streaming solutions using Kafka Connect, Kafka Streams, KSQL, and Schema Registry, and deploying Confluent Cloud services such as ksqlDB Cloud and Apache Flink. Strong background in Docker, Kubernetes, and CI/CD pipelines, with familiarity in stream governance, data lineage, and modern event-driven architectures.

Skills

  • Core Java
  • Data Structures
  • Spring
  • Camunda Bpm
  • Bpmn
  • Kafka
  • React.js
  • Microservices
  • Cassandra
  • Aws
  • Docker
  • Kubernetes
  • Iam
  • Api Gateway
  • Pingfederate
  • Dynamo Db
  • Mango Db
  • Sql Server
  • Open Api
  • Soap Web Services
  • Restful Web
  • Reactive Programming
  • Grpc
  • Golang
  • Angularjs
  • Azure
  • Confluent
  • Apache Flink
  • Python

Languages

German
Advanced
English
Advanced
Tamil
Advanced

Education

Oct 2007 - Jun 2011

PSG College of Technology

B.Tech/B.E. · Coimbatore, India

Certifications & licenses

Oracle 11g Fundamentals

Oracle

Oracle Certified Java Professional

Oracle

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