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Sanjeev Kumar R.

Sanjeev Kumar R.

Full-Stack Developer | Java, Spring Boot, AI Agents & LLM Integration

Full-Stack Developer | Java, Spring Boot, AI Agents & LLM Integration I build scalable software and AI-powered solutions by combining proven full-stack engineering expertise with modern AI tools and LLM technologies. From enterprise applications and microservices to custom AI agents, LLM integrations, and AI-assisted development using GitHub Copilot and Claude, I help turn complex requirements into reliable, maintainable software. With extensive experience in product development across Banking, Finance, E-commerce, Retail, and Healthcare, I focus on clean code, practical solutions, and delivering real business value. AI-Powered Coding: GitHub Copilot and Claude for code generation, refactoring, debugging, test creation, documentation, and code reviews. LLMs & Local AI: Experience exploring local and open-source language models using LM Studio, Llama-based models, and related LLM tooling. Custom AI Agents: Designing and developing custom AI agents to automate repetitive tasks, support development workflows, and integrate AI capabilities into applications. Custom AI Skills & Workflows: Creating reusable AI skills, instructions, and workflows to handle specific tasks, improve consistency, and streamline development processes. LLM Integration: Integrating language models into applications, experimenting with prompts and model configurations, and building practical AI-powered features. AI-Assisted Software Engineering: Applying AI tools alongside established engineering practices, including Test-Driven Development (TDD), clean code, debugging, and code quality analysis. Core Technical Skills Backend Development Java, Java/J2EE, Spring Framework, Spring Boot, Hibernate, Dozer REST APIs, SOAP Web Services, Microservices Swagger / OpenAPI Frontend Development Angular, Polymer JavaScript, jQuery, AJAX, JSON Databases & Search MySQL, MongoDB, Cassandra Elasticsearch Cloud, DevOps & CI/CD Amazon Web Services (AWS), Azure DevOps Jenkins, Ansible, Maven Docker, SVN, GitHub Testing & Code Quality Test-Driven Development (TDD) SonarQube, PMD, Checkstyle Code reviews, refactoring, and maintainable software design Application Servers & Infrastructure Tomcat, Apache, Nginx, WebSphere Windows, Linux Putty, WinSCP Additional Technologies JIRA, Cloudinary Google Maps Services, Google Charts API Eclipse, Spring Tool Suite, IntelliJ IDEA What I Can Help You Build Full-stack web applications and enterprise software Java and Spring Boot backend services and REST APIs Modernization, refactoring, and maintenance of existing applications AI-assisted development and implementation of efficient coding workflows AI-powered application features using LLMs Custom AI agents and task-specific AI workflows Integration of databases, third-party APIs, and cloud services Automated testing, CI/CD pipelines, and code quality improvements

🇳🇱Amsterdam, Netherlands$25/hr100% JSS5.00 (6)Since Dec 2010

Earnings and projects

MRR
$0

Last 6 months ÷ 6

World#244,643 / 412k
🇳🇱Country#795 / 1,538
Revenue, last 30 days
—

Read daily since Oct 13, under 30 days

Total earnings
$5.6k

Billed in all: $5.7k

World#244,643 / 412k
🇳🇱Country#795 / 1,538
Per project
$804
Projects, last 6 months
0
World#209,850 / 412k
🇳🇱Country#613 / 1,538
Projects in all
7

Across 10 contracts

30% fixed70% hourly
World#236,188 / 412k
🇳🇱Country#813 / 1,538

Earnings, last 30 days

$5.7kNothing earned since Oct 13Billed in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$5.6k$5.7k$5.8k$5.9kOct 13Oct 26Nov 7

Tracked from Oct 13, 2026.

Skills