Vignaan Vardhan

Experience

1. Software Engineer Ii

   Barclays

   Sep 2023 — Present

   Engineered RESTful services with Java 17, Spring Boot controllers, JPA entities, and HikariCP connection pooling to orchestrate letter composition and delivery, integrating Kafka,Spring Boot,DynamoDB/S3 on AWS, improving p95 latency from 280,ms to 95,ms.– Designed idempotent API workflows using ETag headers and distributed locks (Redis/ElastiCache) to prevent duplicate dispatches across email/SMS/print channels, cutting reprocessing effort by 60% and sustaining 6M+ communications/month with 99.99% availability.– Implemented event-driven enrichment using AWS Lambda and Amazon SQS for upstream acknowledgements, persisting status transitions in PostgreSQL with transactional outbox pattern, reducing failure-driven retries by 45% and stabilizing month-end peaks of 100K–300K letters/day.– Optimized SQL (window functions, CTEs) and JPA criteria queries for reporting feeds, exporting to Snowflake-compatible parquet in S3 via AWS Glue jobs, decreasing report generation time by 72% and enabling near real-time operational dashboards.– Containerized microservices with Docker and deployed on AWS ECS with Auto Scaling and ALB, introducing blue/green releases via CodeDeploy and health probes; release rollback time dropped from 12,min to 3,min while maintaining 0 production data loss.– Strengthened observability by instrumenting Micrometer metrics, structured JSON logs, and distributed tracing (OpenTelemetry) to CloudWatch and Grafana; integrated PagerDuty for on-call, reducing mean-time-to-recover (MTTR) from 28,min to 9,min.– Hardened privacy and access controls using Spring Security, OAuth2 resource servers, and KMS-managed encryption for customer payloads at rest/in transit, aligning with internal privacy reviews and lowering security-related incidents by 40%.

Education

• Guru Nanak Institutions(GNI)

  Bachelor's degree

• Narayana Junior College , Nallakunta

  95

• Mississippi State University

  Master of Science - MS