Available for Senior Roles

Vishnu Kanna J.

Senior Software Engineer _

Building scalable, high-performance systems in banking and payments for 6.5+ years. Specializing in Java, Spring Boot, microservices, and cloud-native architectures.

View Experience Get in Touch
6.5+
Years Exp.
5
Companies
70%
API Boost
60%
Recon. Gain
Vishnu Kanna J
Open to Opportunities

01 / About

The Engineer
Behind the Code

I'm a Senior Software Engineer with 6.5+ years of experience delivering mission-critical systems across banking, payments, and fintech domains. Currently building the Visa Payments Platform (via Capco Technologies).

My expertise spans Java, Spring Boot, and microservices architecture, with deep hands-on experience in API platforms, SDK development, and cloud-native applications. I've shipped production systems for Goldman Sachs, Morgan Stanley, Visa, and Flipkart.

I believe great software is built at the intersection of clean architecture, rigorous testing, and collaborative delivery — and I bring that philosophy to every engagement.

Banking Payments API Platforms SDK Systems Cloud-Native Microservices
$ cat profile.json
{
  "name": "Vishnu Kanna J",
  "role": "Senior Software Engineer",
  "location": "Bengaluru, IN",
  "experience": "6.5+ years",
  "current": "Visa @ Capco",
  "domain": "Banking & Payments",
  "languages": ["Java", "SQL", "JS"],
  "open_to": "Senior / Lead roles"
}

$ █

02 / Skills

Technical
Arsenal

Core Languages & Frameworks
Java 8/11/17Spring BootSpring CloudSpring SecurityMicroservicesHTMLJavaScriptCSS
API Development & Security
REST APIsOpenAPI / SwaggerAPI Lifecycle MgmtOAuth 2.0JWTPostman
Messaging & Streaming
Apache KafkaIBM MQZooKeeper
Databases & Caching
OracleIBM DB2MySQLRedisNoSQLSQL
Cloud & DevOps
AWSDockerKubernetesJenkinsCI/CDGitMavenGradle
Monitoring & Observability
PrometheusGrafanaSplunk
AI & Tools
Claude AIGitHub CopilotIntelliJEclipse
Testing & Methodology
JUnitJMeterE2E TestingScrumKanbanSystem Design (HLD/LLD)
Domain Expertise
BankingPaymentsFinTechAPI PlatformsSDK Systems

03 / Experience

Career
Journey

Senior Software EngineerMar 2025 — Present
Visa — Payments Domain via Capco Technologies
  • Architected and built a scalable SDK Platform enabling partner banks and enterprise clients to integrate Visa payment capabilities into their applications, reducing integration time-to-market.
  • Contributed to Visa Digital Experience (VDEX), consolidating multiple onboarding workflows into a unified enterprise API platform with a standardized backend integration layer.
  • Designed secure, high-performance REST APIs — documented and tested via OpenAPI/Swagger — using Spring Cloud, Kafka-based event-driven microservices, and OAuth 2.0/JWT-secured endpoints.
  • Serving as a technical point of contact, providing technical guidance, code reviews and delivery tracking, while overseeing end-to-end delivery from requirement analysis to production releases.
Java 17Spring BootSpring CloudKafkaRedisOAuth 2.0 / JWTDockerKubernetesJenkins
Senior Software EngineerSep 2024 — Feb 2025
Goldman Sachs — Banking Domain via NTT Data
  • Executed secure CredVault migration of user credentials with full data integrity and compliance.
  • Streamlined migration workflows minimizing disruptions to user access.
Java 8MavenDB2JenkinsGS Cloud
Software EngineerMar 2023 — Sep 2024
Morgan Stanley — Banking Domain via Wissen Technology
  • Achieved 70% API performance increase through refined data validation techniques.
  • Designed automated reconciliation workflows resulting in 60% performance improvement.
  • Established robust performance monitoring with Prometheus and Grafana.
Java 8DockerJMeterPrometheusGrafanaSplunk
Associate Software EngineerJun 2022 — Feb 2023
Flipkart — Product Domain via Wissen Technology
  • Led VM to FCP cloud migration, accounting for 40% of total project workload.
  • Orchestrated Kubernetes migration contributing 30% of workload, enabling automated scaling.
Java 8KafkaDockerK8S
Program AnalystOct 2020 — Jun 2022
IELTS — Education Domain via Cognizant
  • Spearheaded packet processing system development (50% of workload) improving scanning efficiency.
  • Contributed to 20% application performance improvement through backend optimizations.
Java 7/8Spring BootOracleJenkins

04 / Projects

Flagship
Builds

SDK Platform & Visa Digital Experience (VDEX)
Mar 2025 — Present
Visa via Capco Technologies

Architected and developed reusable SDK Platform components that let partner banks and enterprise clients integrate Visa payment capabilities directly into their own applications. Contributed to VDEX, consolidating multiple onboarding workflows into one unified enterprise API platform with a standardized backend integration layer — cutting integration time-to-market for partner banks.

  • Secure, high-performance REST APIs documented and tested with OpenAPI/Swagger
  • Spring Cloud microservices with Kafka-based event-driven communication
  • OAuth 2.0 / JWT-secured API endpoints across the platform
  • Redis caching for distributed, performance-critical components
  • Dockerized, Kubernetes-deployed, with Jenkins CI/CD pipelines
Java 17Spring BootSpring CloudKafkaRedisDockerKubernetesAWS
CredVault — Enterprise Credential Migration
Sep 2024 — Feb 2025
Goldman Sachs via NTT Data

Built backend services and validation logic to migrate enterprise credentials into CredVault within Goldman Sachs' banking environment, with a strong emphasis on data integrity, security and regulatory compliance across every step of the migration.

  • REST APIs and validation services documented via OpenAPI/Swagger
  • Backend validation logic built for a compliance-heavy banking environment
  • Production troubleshooting and issue resolution across environments
Java 17Spring BootOracleJenkins
Mainframe → IBM DB2 Migration Platform
Mar 2023 — Sep 2024
Morgan Stanley via Wissen Technology

Built a 3-application migration platform from scratch to move ~70 million records from Mainframe systems to IBM DB2 — spanning message-driven data processing, automated validation & reconciliation, and API-based orchestration of the whole workflow.

Mainframe → IBM MQ → Java/Spring Boot → IBM DB2
  • Automated validation & reconciliation app comparing Mainframe FCP data vs. DB2 — ~70% more efficient than the previous manual process
  • REST API/gateway app orchestrating validation runs, comparisons and reconciliation reports
  • Improved API response time from 233ms to 35ms — a ~20% system performance gain
  • Monitored with Prometheus & Grafana; containerized with Docker
Java 8Spring BootIBM MQIBM DB2DockerJenkinsPrometheusGrafana
Big Billion Days — Fraud Detection Platform
Jun 2022 — Feb 2023
Flipkart via Wissen Technology

Worked on Commit Manager and TC, Java/Spring Boot microservices powering fraud detection for Flipkart's Big Billion Days sale, and contributed to migrating those services from physical servers to Kubernetes as part of the move to Flipkart Cloud Platform (FCP).

  • Backend API development and feature implementation for the fraud-detection platform
  • Migrated microservices to Kubernetes (K8s) on Flipkart Cloud Platform
  • ~15% system performance improvement during high-traffic BBD periods
  • API and feature testing via Postman; validated data through cloud database access
JavaSpring BootKafkaZooKeeperKubernetesPostman

05 / Impact

Numbers That
Matter

70%
API Performance Increase at Morgan Stanley through refined data validation techniques
60%
Reconciliation Performance Improvement reducing manual oversight and boosting productivity
50%
Packet Processing Workload at Cognizant improving scanning efficiency and response time
40%
Cloud Migration Workload at Flipkart from VMs to FCP improving scalability
30%
Kubernetes Migration Contribution at Flipkart enabling automated scaling and fault tolerance
20%
Application Performance Improvement through backend optimizations and efficient processing

// 05 — Contact

Let's Build
Something Great

Open to senior engineering and leadership roles in banking, payments, or platform engineering. Based in Bengaluru — available for hybrid or remote opportunities.

+91 7530088667 Email Me LinkedIn GitHub