AI engineering · Full-stack development · Application security

Suneel Kumar.

Intelligent systems.
Secure foundations.

I build production full-stack applications with Java, Spring Boot, React, and Python, and I integrate AI/GenAI into real workflows. 10+ years across financial services, healthcare, and commerce.

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  • Location: Dallas, TX
  • Work arrangement: Remote or Dallas-area hybrid
  • Work authorization: H-1B — sponsorship and transfer required
  • Availability: Available immediately
Suneel Kumar
Production AI. Full-stack delivery.
Security at every layer.
10+ yearsEnterprise engineering

Dallas, TX

Experience across
finance & healthcare

Capital OneFidelity InvestmentsCVS HealthEssendant

01 Selected work

Built for real-world complexity.

A closer look at the systems I’ve helped deliver—and the work I owned.

AI engineering & agent workflows

Production AIfrom reusable skills to operational support

Capital One

AI Skills & Operations Automation

Agent skills for engineering teams and an LLM service supporting payment operations.

My contribution

Built reusable skills, maintained the registry and CLI, and developed the FastAPI inference service and prompt templates.

Explore the engineering
  • Built a Python/FastAPI LLM inference service that summarizes historical processing and surfaces patterns and anomalies.
  • Designed reusable prompt templates and guardrails for operational summaries and decision support.
  • Added monitoring for latency, token usage, accuracy, and fallback behavior.
  • Python
  • FastAPI
  • LangChain
  • RAG
  • Prompt Engineering
  • AWS
  • CloudWatch

Full-stack & distributed systems

Millionsof payments processed daily

Capital One

Payments Fulfillment Platform

Secure fulfillment across ACH, debit, checks, balance transfers, and cross-border payments.

My contribution

Built the public fulfillment API, vendor ingestion, and batch-posting pipelines across 40+ file formats.

Explore the engineering
  • Built secure RESTful APIs with Spring Boot 3.x/4.x and Spring Security, including OAuth 2.1 and JWT-based access.
  • Integrated Java 8 to 17 migration and Spring Boot 3.x to 4.x upgrades across the platform.
  • Built React 18 interfaces with TypeScript, hooks, and secured API communication.
  • Java 17
  • Spring Boot 3.x/4.x
  • React 18
  • Spring Security
  • OAuth2
  • JWT
  • AWS
  • Docker
  • Jenkins

Application & API security

PCI DSScontrols embedded end to end

Capital One

Secure API and Legacy SOAP Integration

A real-time card-transfer service operating inside the Cardholder Data Environment.

My contribution

Built the Fastify service with proof-of-possession tokens, field-level encryption, and structured security logging.

Explore the engineering
  • Implemented role-based access with OAuth 2.1, JWT, and token validation filters.
  • Maintained SOAP-based legacy services with Apache CXF and JAXB for backward compatibility.
  • Automated security and code-quality checks with SonarQube in CI/CD.
  • Java 17
  • Spring Security
  • OAuth 2.1
  • JWT
  • Apache CXF
  • JAXB
  • REST
  • SOAP
More enterprise work Healthcare, commerce & web platforms

Capital One

Java 17 and Spring Boot Modernization

Modernized backend services and upgraded the application stack while reducing legacy dependencies.

  • Migrated services from Java 8 to Java 17 and adopted records, sealed classes, and switch expressions.
  • Upgraded Spring Boot applications from 3.x to 4.x while maintaining backward compatibility for existing services.
  • Containerized services with Docker and upgraded Jenkins pipelines for Java 17 build targets.
  • Java 17
  • Spring Boot 3.x/4.x
  • Docker
  • Jenkins

Capital One

AI Customer Support and RAG

GenAI workflows that answer questions from approved enterprise data with guardrails and monitoring.

  • Integrated LangChain, LLM APIs, embeddings, and vector search to deliver context-aware responses.
  • Implemented prompt templates, PII filtering, response guardrails, and automated model-output evaluation.
  • Monitored latency, token usage, accuracy, and fallback behavior through CloudWatch and application logs.
  • Python
  • FastAPI
  • LangChain
  • LLM APIs
  • RAG
  • Embeddings
  • Vector Search
  • CloudWatch

Fidelity Investments

Campaign Processing Platform

A high-throughput campaign-processing platform handling millions of user events.

  • Led delivery of a secure, high-performance transaction platform using Java and Spring Boot microservices.
  • Integrated Python NLP and LLM services to summarize financial documents and classify exceptions.
  • Added retrieval workflows with embeddings, vector search, audit logging, and human-review checkpoints.
  • Java 8/11
  • Spring Boot 2.x
  • React
  • Angular
  • Python
  • AWS ECS
  • Lambda
  • DynamoDB
  • Splunk

CVS Health

JMS and ActiveMQ Migration

Migrated messaging flows and modernized asynchronous integrations.

  • Migrated JMS services from WebLogic JMS to Apache ActiveMQ with Apache Camel message routing.
  • Built asynchronous agent-server interactions and Spring Boot microservices on AWS EC2.
  • Integrated MongoDB, MySQL, and Oracle storage with batch Java ingestion utilities.
  • Java 8
  • Spring Boot
  • Apache ActiveMQ
  • Apache Camel
  • JMS
  • AWS SQS
  • MongoDB

Independent

Personal AI Projects

Local-first AI prototypes focused on private RAG, prompt evaluation, and secure GenAI workflows.

  • Experimenting with local models and private vector databases so sensitive data stays inside the network.
  • Building prompt and model evaluation harnesses with reusable test cases and regression checks.
  • Applying guardrails, PII filtering, and human-review checkpoints to AI workflows.
  • Python
  • FastAPI
  • LangChain
  • Local Models
  • Private RAG
  • Vector Search
  • Prompt Evaluation

Enterprise work; source code is private. These summaries describe my contributions without sharing proprietary code.

02 Career

A decade of building & delivering.

From Java services to cloud platforms and production AI. Finance, healthcare, and commerce.

  1. Nov 2023 – Present · Assignment ending soonMost recent engagement

    Capital One

    Richmond, VA

    Senior Java Full Stack Developer

    Java 17 · Spring Boot 3/4 · React 18 · GenAI/RAG · AWS

    Led the migration of backend services from Java 8 to Java 17 and upgraded Spring Boot applications from 3.x to 4.x.

    Role details & technologies
    • Built secure RESTful services with Spring Boot, Spring Security, OAuth 2.1, and JWT, and built React 18 and Angular 11 interfaces that consume those APIs.
    • Integrated GenAI into customer-support and operational workflows using LangChain, LLM APIs, embeddings, vector search, and retrieval-augmented generation.
    • Implemented prompt templates, context management, response guardrails, PII filtering, and automated evaluation for GenAI services.
    • Monitored AI latency, token usage, accuracy, and fallback behavior through CloudWatch and application logs.
    • Built Python services with FastAPI, Flask, and Pandas for automation, data processing, and scheduled jobs.
    • Deployed services on AWS with EC2, S3, RDS, VPC, Lambda, SQS, and SNS, and managed monitoring with CloudWatch and IAM.
    • Maintained SOAP-based legacy services with Apache CXF and JAXB, and upgraded CI/CD pipelines for Java 17 builds with Docker and Jenkins.
    • Wrote unit and integration tests with JUnit and Mockito, and enforced code quality with SonarQube.
    • Java 17
    • Spring Boot 3.x/4.x
    • React 18
    • Angular 11
    • Python / FastAPI
    • LangChain
    • RAG
    • AWS
    • Docker
    • Jenkins

    Environment: Java 17, Spring Boot 3.x/4.x, Spring MVC, Spring Security, OAuth 2.1, JWT, Spring Data JPA, Angular 11, React 18, TypeScript, REST, SOAP, Apache CXF, JAXB, Oracle 19c, IBM DB2, Docker, Tomcat, Jenkins, Maven, JUnit, Mockito, Log4j2, SonarQube, GitHub, JIRA, AWS (EC2, S3, RDS, IAM, VPC, Lambda, SQS, SNS, Route 53, CloudWatch), Python, FastAPI, Flask, Pandas, LangChain, LLM APIs, RAG, embeddings, vector databases, prompt engineering

  2. May 2022 – Oct 2023

    Fidelity Investments

    Durham, NC

    Full Stack Java Developer

    Java/Spring Boot · React/Angular · Python NLP/LLM · AWS

    Led the end-to-end delivery of the Symphony Campaign Processing platform, handling millions of user events.

    Role details & technologies
    • Designed and built scalable backends with Java 8/11, Spring Boot 2.x, Hibernate, and JDBC using stateless REST APIs.
    • Migrated monolithic code into independent Spring Boot microservices for better scalability, deployment agility, and fault isolation.
    • Built modern React.js and Angular interfaces with React Hooks, Redux, TypeScript, Bootstrap, and RxJS.
    • Secured APIs with Spring Security, OAuth 2.0, and JWT, with role-based access control and AWS IAM integration.
    • Integrated Python NLP and LLM services with Java/Spring Boot APIs to summarize financial documents, classify exceptions, and surface recommendations.
    • Implemented retrieval workflows with embeddings and vector search, plus prompt templates, response validation, audit logging, and human-review checkpoints.
    • Deployed services to AWS ECS and used Lambda, RDS, DynamoDB, S3, SQS, SNS, Glue, and CloudFormation, with Splunk for observability.
    • Java 8/11
    • Spring Boot 2.x
    • React.js
    • Angular
    • Python
    • AWS ECS
    • Lambda
    • DynamoDB
    • Splunk

    Environment: Java 8/11, Spring Boot, Spring Security, JPA, Hibernate, REST, SOAP (Apache CXF, JAXB), OAuth2, JWT, React.js, Angular, TypeScript, Node.js, Python, FastAPI, Pandas, NumPy, NLP, LLM APIs, RAG, embeddings, vector search, AWS ECS, Lambda, RDS, DynamoDB, S3, SNS, SQS, Glue, CloudFormation, CloudWatch, Jenkins, Maven, Docker, GitHub, Splunk, JUnit, Mockito, SonarQube

  3. Aug 2021 – Apr 2022

    Capital One

    Richmond, VA

    Senior Java Full Stack Developer

    Java 8 · Spring Boot 2 · Angular 8 · AWS

    Built responsive React 17 and Angular 8 UI components with TypeScript, React Hooks, reactive forms, and RxJS observables.

    Role details & technologies
    • Built RESTful services with Spring Boot 2.x and Spring MVC, using Jackson for JSON processing and Angular HTTP clients for integration.
    • Implemented Spring Security with OAuth2 and JWT to secure REST endpoints across microservices.
    • Performed backend persistence with Hibernate 5.x and Spring Data JPA against Oracle 11g and DB2.
    • Integrated SOAP-based legacy services with Apache CXF and JAXB, and managed Docker and Jenkins CI/CD workflows.
    • Deployed services on AWS EC2, S3, and RDS, with IAM access management, CloudWatch monitoring, and Lambda/SQS/SNS integrations.
    • Built Python automation and API utilities with Flask and Pandas, and integrated Python ML/NLP inference services with Spring Boot APIs.
    • Java 8
    • Spring Boot 2.x
    • Angular 8
    • Hibernate 5.x
    • Docker
    • Jenkins
    • AWS

    Environment: Java 8, Spring Boot 2.x, Spring MVC, Spring Security, OAuth2, JWT, Hibernate 5.x, JPA, Angular 8, React 17, TypeScript, JavaScript, REST, SOAP, Apache CXF, JAXB, Oracle 11g, DB2, Docker, Jenkins, Maven, JUnit, Mockito, Log4j2, GitHub, AWS (EC2, S3, RDS, IAM, VPC, Lambda, SQS, SNS, Route 53, CloudWatch), Python, Flask, Pandas, NLP, ML integration

  4. Jun 2020 – Jul 2021

    CVS Health

    Chicago, IL

    Java Full Stack Application Developer

    Spring Boot · Angular · JMS/ActiveMQ · AWS · NoSQL

    Built responsive Angular 5/6 single-page applications with TypeScript, reactive forms, custom pipes, and RxJS.

    Role details & technologies
    • Developed Spring Boot REST APIs secured with OAuth2 and JWT, and integrated Angular token interceptors.
    • Migrated JMS services from WebLogic JMS to Apache ActiveMQ and built asynchronous messaging flows with Apache Camel.
    • Created and deployed Spring Boot microservices on AWS EC2 with S3, SQS, and SES integrations.
    • Built batch ingestion and merge utilities in Java for large data volumes, working across MySQL, Oracle, and MongoDB.
    • Maintained Cassandra clusters with DataStax OpsCenter and managed keyspaces and replication.
    • Automated builds and deployments with Maven, Jenkins, and Docker, and tested with JUnit, Mockito, SonarQube, and JMeter.
    • Java 8
    • Spring Boot
    • Angular 5/6
    • ActiveMQ
    • MongoDB
    • Cassandra
    • AWS
    • Docker
    • Jenkins

    Environment: Java 8, JEE, Spring, Spring Boot, Spring Security, Spring JDBC, Hibernate, Angular 5/6, TypeScript, REST, OAuth2, JWT, Apache Camel, ActiveMQ, MongoDB, MySQL, Oracle, Cassandra, AWS (EC2, S3, SQS, SES), Jenkins, Docker, Maven, Git, Bitbucket, JIRA, Rally, JUnit, Mockito, SonarQube, JMeter, WebLogic

  5. Jul 2018 – May 2020

    Essendant

    Denver, CO

    Java Full Stack Developer

    Angular 2 · Spring Boot · JRules · AWS · Docker

    Built responsive Angular 2 and Node.js UI modules with TypeScript, component-based architecture, and Angular routing.

    Role details & technologies
    • Developed RESTful web services with Spring Boot and Spring MVC, secured with OAuth 2.0 and JWT.
    • Used Spring Data MongoDB, JPA, and Hibernate with Oracle and SQL Server for persistence.
    • Integrated ILOG JRules for rule-based decision services and used SOAPUI for SOAP web-service testing.
    • Deployed Dockerized microservices on AWS EC2 and managed builds, tests, and deployments with Jenkins and Maven.
    • Java 8
    • Spring Boot
    • Angular 2
    • Node.js
    • MongoDB
    • Oracle
    • Docker
    • AWS

    Environment: Java 8, Spring Boot, Spring MVC, Spring ORM, Spring Batch, Hibernate, JPA, Angular 2, Node.js, MongoDB, Oracle, SQL Server, TypeScript, REST, OAuth2, JWT, SOAP, SOAPUI, JRules (ILOG BRMS), Docker, AWS EC2, Jenkins, Maven, Git, JIRA, JBoss, Apache Tomcat

  6. Mar 2017 – Jun 2018

    Teleflora

    Oklahoma City, OK

    Senior Java Developer

    Enterprise Java · Spring · Hibernate · SOAP/REST

    Designed application architecture with UML and GoF design patterns, using Spring IOC and AOP.

    Role details & technologies
    • Built SOAP and REST web services with JAX-WS, JAX-RS, Apache CXF, JAXB, and WSDL.
    • Integrated authentication and authorization using SiteMinder in the WebSphere application environment.
    • Built JSF 2.0 and PrimeFaces UI components and deployed on IBM WebSphere Application Server 8.1.
    • Java 7/8
    • Spring 3.0
    • Hibernate 3.5
    • JSF 2.0
    • PrimeFaces
    • WebSphere 8.1

    Environment: Java 7/8, Spring (DI, AOP, MVC), Hibernate, JPA, Angular 2, JSF, PrimeFaces, REST, SOAP, JAX-RS, JAX-WS, JAXB, Apache CXF, WSDL, SiteMinder, WebSphere, Oracle, MySQL

  7. Sep 2015 – Feb 2017

    Credit Acceptance Corporation

    Southfield, MI

    Java Developer

    Service integration · WS-Security · Mule ESB

    Built a dynamic service-oriented framework with XML marshalling and SOAP/REST service orchestration.

    Role details & technologies
    • Used Spring MVC, Spring Beans, and Hibernate ORM for business logic and Oracle persistence.
    • Implemented EJB-based business logic and x.509 certificate-based authentication.
    • Implemented WS-Security in Mule ESB integrations and deployed on IBM WebSphere with Apache Ant and Ivy.
    • Java
    • Spring
    • Hibernate
    • Mule ESB
    • Oracle
    • WebSphere
    • Ant/Ivy

    Environment: Java, Spring, Hibernate, JAX-RS, JAX-WS, Apache CXF, Axis, JAXB, SOAP, REST, JSF, PrimeFaces, JavaScript, XML, Mule ESB, Oracle, EJB, WebSphere, Log4j, Ant, Ivy, JUnit

  8. Sep 2014 – Aug 2015

    Diageo

    Norwalk, CT

    Java Developer

    Java · Spring · Hibernate · Oracle

    Built web applications with JSP, HTML, CSS, JSTL, JavaScript, and jQuery for authentication and client-side validation.

    Role details & technologies
    • Used Spring 3.x for dependency injection, MVC controllers, and AOP-based transaction management.
    • Integrated Hibernate 3.6 with Oracle 11g, writing HQL queries, stored procedures, functions, and triggers.
    • Consumed SOAP services through Apache Axis and maintained builds and deployments with Ant and Log4j.
    • Java
    • Spring 3.x
    • Hibernate 3.6
    • JSP
    • jQuery
    • Oracle 11g

    Environment: Java, JSP, Servlets, Spring 3.x, Hibernate 3.6, jQuery, JavaScript, HTML, AJAX, Apache Axis, SOAP, WSDL, Oracle 11g, PL/SQL, WebSphere, Ant, Log4j, JUnit

How I work

Ownership beyond
the pull request.

Read the full résumé

I connect the application, infrastructure, and operational details that make a system dependable. My work spans API design and front-end delivery, cloud architecture, security, and the production support that comes after launch.

Java and Spring Boot are my foundation. Go, Python, React, and Angular let me work across the stack. More recently, I’ve shipped LLM inference services and reusable AI workflows for payment operations.

More about my approach

I'm a senior full-stack developer with 10+ years delivering Java, Spring Boot, React, and Python solutions across the software lifecycle. Recent work includes secure integration of LLM APIs, retrieval-augmented generation, embeddings, and vector search.

My foundation is modern Java: I've migrated applications from Java 8 to 17, upgraded Spring Boot from 3.x to 4.x, and helped move monoliths into microservices with Spring Security, Spring Data JPA, and AWS-hosted services.

On the front end, I build React 18 and Angular applications with TypeScript, hooks, state management, and secure token-based APIs. On the data side, I use Python with FastAPI, Flask, and Pandas for automation, data processing, and AI services.

For AI, I've integrated LangChain, LLM APIs, embeddings, vector databases, RAG, prompt engineering, response guardrails, and model-output evaluation. I also hold AWS Solutions Architect – Professional and Google Cloud Professional Machine Learning Engineer certifications.

03 Role fit & expertise

Three disciplines. One production mindset.

AI Engineer, Full Stack Developer, and Cybersecurity Engineer roles—grounded in enterprise delivery. My security specialization is application and cloud security.

AI Engineer

Applied GenAI · Agent workflows · Engineering automation

Production LLM integration and reusable agent skills that support real engineering and operational workflows—from Jira and pull requests to payment-file analysis.

  • Python
  • FastAPI
  • LLM Integration
  • AI Agents
  • Claude Code
  • Windsurf
  • Prompt Engineering
  • RAG
  • AWS
  • Vertex AI
Explore AI skills & operations automation

Full Stack Developer

Java & Spring Boot · Distributed systems · Cloud platforms

End-to-end delivery of enterprise applications: secure APIs, event-driven services, responsive interfaces, and production operations.

  • Java 17/21
  • Spring Boot
  • React
  • Angular
  • TypeScript
  • AWS
  • GCP
  • Kafka
  • Docker
  • Kubernetes
  • SQL
  • JUnit / Mockito
See enterprise delivery experience

Cybersecurity Engineer

Application security · Cloud security · Secure software engineering

Security engineering embedded in production software: identity and access controls, API protection, encryption, vulnerability remediation, and compliance-aligned delivery.

  • OAuth2 / OIDC
  • JWT
  • Mutual TLS / PKI
  • AWS IAM
  • KMS
  • Secrets Manager
  • Vault
  • PGP
  • Checkmarx
  • Threat modeling
  • PCI DSS
  • NIST 800-53
See secure payment-platform work
Explore the complete technology toolkit

Languages

  • Java 8/11/17
  • Python
  • JavaScript (ES6+)
  • TypeScript
  • SQL

Backend

  • Spring Boot 2.x–4.x
  • Spring MVC
  • Spring Security
  • Spring Data JPA
  • Spring Cloud
  • Spring Batch
  • Hibernate/JPA
  • JMS
  • ActiveMQ
  • RESTful APIs
  • Swagger/OpenAPI
  • Microservices

Frontend

  • React.js
  • React Hooks
  • Redux
  • Angular 2–14
  • TypeScript
  • JavaScript (ES6+)
  • HTML5
  • CSS3
  • Bootstrap
  • RxJS
  • AJAX
  • jQuery
  • Node.js

Databases

  • Oracle
  • SQL Server
  • IBM DB2
  • MySQL
  • MongoDB
  • DynamoDB
  • Cassandra

Web Services

  • RESTful APIs
  • SOAP
  • WSDL
  • JAX-WS
  • JAX-RS
  • Apache CXF
  • Apache Axis
  • Swagger/OpenAPI

AI / GenAI

  • LLM APIs
  • LangChain
  • RAG
  • Embeddings
  • Vector Search
  • Prompt Engineering
  • Response Guardrails
  • Model-Output Evaluation
  • FastAPI
  • Flask
  • Pandas
  • NumPy

Cloud (AWS)

  • EC2
  • S3
  • RDS
  • DynamoDB
  • Lambda
  • SNS
  • SQS
  • CloudWatch
  • IAM
  • VPC
  • Route 53
  • CloudFormation
  • Glue
  • ECS
  • Elastic Beanstalk

Security

  • OAuth2
  • JWT
  • Spring Security
  • Role-Based Access Control
  • PII Filtering
  • Prompt-Injection Defense
  • Audit Logging
  • Secrets Management

DevOps & CI/CD

  • Docker
  • Jenkins
  • GitHub Actions
  • Maven
  • Gradle
  • SonarQube
  • Git
  • GitHub
  • Bitbucket

Testing & Observability

  • JUnit
  • Mockito
  • SonarQube
  • JMeter
  • Log4j2
  • Splunk
  • AWS CloudWatch

Platforms & Servers

  • Apache Tomcat
  • JBoss
  • WebLogic
  • IBM WebSphere
  • Unix
  • Linux
  • JRules (IBM ODM)

04 Credentials

Cloud & AI certifications.

AWS Certified Solutions Architect – Professional

Amazon Web Services · 2025

Verify on Credly

Professional Machine Learning Engineer Certification

Google Cloud · 2025

Verify on Credly

05 Foundation

Education

Master of Science in Computer Science

Houston, TX

Bachelor of Technology in Computer Science and Engineering

India

06 Start a conversation

Let’s build something dependable.

Hiring for Java full stack, application security, or cloud security? Share the role, team, and engineering challenge. I’d welcome a conversation about where my experience can contribute.

281-786-5856suneeluhcl@gmail.com
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