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Ultron03/README.md

Hi, I'm Ujjwal

Full-stack developer working mainly in Java / Spring Boot, with C# / .NET and React / Angular on the side. These days I build LLM features the way backend systems should be built: measured with evals, protected against prompt injection, and limited on cost.

Featured work

Project What it is Stack
token-allowance Spring Boot starter that enforces per-user, per-tenant and per-session token and dollar budgets on Spring AI calls, and stops runaway tool loops. Demo runs on a local model, no API key needed. Java, Spring AI
retrieval-chatbot RAG chatbot with hybrid search (BM25 + vectors), a cross-encoder reranker, and three eval suites: retrieval recall, answer accuracy and prompt-injection attack rate. Python, sentence-transformers, Ollama
tradehub Mini trading platform: JWT auth, buy and sell orders against simulated live prices, portfolio and profit/loss tracking. C#, ASP.NET Core 8, EF Core, React
taskflow Task management app with a REST API, JWT auth and Swagger docs (web client). Java 21, Spring Boot, PostgreSQL, TypeScript
tinyurl-generator URL shortener with Base62 codes, click analytics and a scheduled cleanup of expired links. Java 21, Spring Boot, PostgreSQL, React

Tools

Backend: Java, Spring Boot, Spring AI, C#, ASP.NET Core, Python
Frontend: React, Angular, TypeScript, Tailwind
Data and infra: PostgreSQL, Docker, Ollama

Pinned Loading

  1. retrieval-chatbot retrieval-chatbot Public

    RAG chatbot: hybrid BM25 + vector search, cross-encoder reranking, retrieval/answer/prompt-injection evals

    Python

  2. taskflow-backend taskflow-backend Public

    Task management REST API — Spring Boot, PostgreSQL, JWT, Swagger

    Java

  3. tinyurl-generator tinyurl-generator Public

    URL shortener with click analytics — Spring Boot 4, PostgreSQL, React

    Java

  4. token-allowance token-allowance Public

    Java

  5. token-allowance-demo token-allowance-demo Public

    Java

  6. tradehub tradehub Public

    Mini trading platform — ASP.NET Core 8, EF Core, React, JWT

    C#