Senior Java Backend Developer with Spring Boot Expertise

Karthikeyan Selvam

Java Backend Developer

+91-951******* ******************@*****.*** https://www.linkedin.com/in/karthikeyan-s-4949821a1 Namakkal, India

SUMMARY

Performance driven Spring Boot Developer with 5+ years of experience in designing, developing, and optimizing scalable, high volume server side applications. Specialized in Java, Spring Boot, gRPC, and event driven architectures (CQRS/Event Sourcing). Proven expertise in third party fintech integrations (Plaid, Modern Treasury, HubSpot), API performance testing (JMeter, Postman), and automated financial compliance reporting. Strong track record of delivering reliable, production ready solutions in fast paced environments. SKILLS

• Languages & Core Tech: Java (8/17), SQL, CQRS, Event Sourcing, Microservices, gRPC, GraphQL

• Frameworks: Spring Boot, Spring WebFlux, Axon Framework, Hibernate, MyBatis

• Databases & Tools: PostgreSQL, MySQL, pgAdmin, IntelliJ IDEA, Swagger, Ngrok, Notepad++

• Reporting & Monitoring: JasperStudio (JRXML), Kibana, Grafana, Postman, JMeter

• Third Party Integrations: Plaid, Modern Treasury, HubSpot, QuoteMedia, Broadridge, PandaDocs, Twilio, SendGrid

• DevOps & Collaboration: GitHub, Bitbucket, Jira

EXPERIENCE

System Engineer Chennai, India

Tata Consultancy Service (TCS) 06/2025 - Present

• Designed and developed high volume backend components for global financial workflows.

• Implemented event driven microservices using Spring Boot, Axon Framework, and CQRS patterns.

• Optimized PostgreSQL data architectures and maintained code quality in IntelliJ IDEA.

• Built automated logging/documentation pipelines with Kibana and Swagger.

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Senior Programmer Chennai, India

Ionixx Technologies Pvt Ltd 02/2021 – 05/2025

• Developed and maintained server-side applications using Spring Boot, Spring-webflux and Java 17.

• Analyzed user requirements and translated them into functional and technical designs.

• Developed RESTful APIs and gRPC services for seamless data exchange.

• Conducted API performance testing using JMeter and Postman.

• Identified and fixed bugs, improving software stability and performance. PROJECTS

Trade Xpress 06/2025 - Present

• Environment: Java, Spring Boot, Axon framework, Swagger, pgAdmin, Jasper studio, Kibana

• Built large scale trade finance platform with CQRS/Event Sourcing

• Designed custom commands/event handlers to enforce transactional consistency.

• Automated compliance reporting using JasperStudio (JRXML).

• Monitored system health and transaction logs via Kibana. Siebert Stock Market Platform 01/2024 – 05/2025

• Environment: Java, Spring Boot, Spring WebFlux, Plaid, Modern Treasury, HubSpot, PandaDocs, QuoteMedia, Broadridge, Jira, MS Excel

• Developed a gRPC-based web application for stock market order creation utilizing Spring-webflux and Java 17. .

• Integrated third-party APIs for order execution and money movement.

• Implemented a robust money movement flow using Plaid and Modern Treasury.

• Conducted bug fixing and performance optimization. Enum Global Trading Platform 01/2023 - 12/2023

• Environment: Java, Spring Boot, Modern Treasury, Jira, MS Excel

• Developed features for user creation, account management, and money movement utilizing Spring Boot and Java 17.

• Implemented webhook integrations and tested them locally using Ngrok.

• Analyzed and integrated third-party platforms for seamless transaction processing.

• Fixed critical bugs and optimized application performance. Voyaj Social Platform 07/2022 - 12/2022

• Environment: Java, Spring Boot, JMeter, Postman, MS Excel

• Developed APIs for user profile updates, notifications, and password settings.

• Conducted performance testing using JMeter and Postman.

• Created technical documentation for API implementations.

• Fixed issues to enhance platform reliability

RR Portal Enhancement 01/2022 - 06/2022

• Environment: Java, Spring Boot, SMTP, SendGrid, JasperStudio, MS Excel

• Developed features for employee information monitoring utilizing Spring Boot and Java 8.

• Implemented REST APIs for managing employee details.

• Created automated email alerts using SMTP and SendGrid.

• Translated user requirements into functional and technical designs INTERNSHIP 02/2021 - 10/2021

• Environment: Spring Boot, SQL, IntelliJ IDEA, Postman, pgAdmin, JMeter.

• Learned core Spring Boot concepts and SQL fundamentals during the internship.

• Developed a demo application to apply learned concepts using Spring Boot and SQL.

• Utilized IntelliJ IDEA for development, Postman for API testing, and pgAdmin for database management.

• Gained hands-on experience with JMeter for performance testing of APIs EDUCATION

B.E - CSE

Muthayammal College Of Engineering- Rasipuram, GPA 7.3 08/2017 - 05/2021

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