Project archive

Backend, AI, automation, and public-sector projects.

A collection of systems I have worked on across financial data processing, HR operations, government workflows, RAG pipelines, automation, and utility tools.

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Financial data platform

Money360 application

Backend and document-processing work for a platform that reads bank statements and extracts structured transaction data.

  • Built PDF and Excel parsing pipelines for automated transaction extraction.
  • Worked across storage, parsing, backend services, and downstream analysis workflows.
  • Used PHP, Python, Apache Tika, AWS S3, MongoDB, Redis, and AI-assisted processing components.
PHP Python Document parsing Financial data AWS S3

Internal HR operations

HRStreamline HRMS

Human Resource Management System for employee records, workflows, and administrative operations.

  • Developed backend modules and APIs for HR workflows.
  • Added automation features to reduce manual handling.
  • Improved maintainability around day-to-day administrative usage.
HRMS Backend APIs Automation PHP

Deputy Commissioner Office, Jammu

BADP-SSY web and Android app

Beneficiary management, project tracking, and fund monitoring platform under the BADP program.

  • Built workflows for project visibility and fund monitoring.
  • Worked with government stakeholders to digitize administrative processes.
  • Focused on transparency, traceability, and field-friendly usage.
Government Web app Android app Workflow digitization

Himachal Pradesh Real Estate Regulatory Authority

HP RERA platform

Core modules for registrations, project approvals, and grievance-handling workflows.

  • Worked on RERA registrations, approvals, and grievance modules.
  • Improved system performance and user experience.
  • Balanced usability with compliance-heavy regulatory requirements.
Government Compliance Approvals Grievance workflows

AI-powered backend systems

RAG and semantic search pipelines

Retrieval-Augmented Generation pipelines for document understanding, search, and AI-assisted workflows.

  • Designed ingestion, parsing, chunking, embeddings, vector search, and answer workflows.
  • Integrated LLMs into backend systems and APIs.
  • Used Qdrant, FAISS, AWS Bedrock, LlamaIndex, HuggingFace, LiteLLM, and FastAPI.
LLM RAG Qdrant FAISS FastAPI

Internal process automation

n8n workflow automation

Workflow automation for internal processes, AI pipelines, notifications, and data movement.

  • Built repeatable workflows around APIs and backend services.
  • Connected automation steps to AI-assisted processing flows.
  • Reduced manual operational work in recurring business processes.
n8n Automation APIs AI workflows

RITCOP IT Services LLP

Business websites, CMS, ERP, and ecommerce systems

Long-running web development work across business websites, CMS systems, ERP-style modules, and ecommerce workflows.

  • Built and maintained PHP-based business applications.
  • Delivered backend modules, integrations, and operational dashboards.
  • Provided consultancy around web development and IT infrastructure.
PHP CMS ERP Ecommerce Consulting

rahulrehan.com/tools

Public utility tools

Small web utilities including hash generators and calculators hosted on the personal site.

  • Built PHP hash utilities for MD5, SHA1, and PHP password hashing.
  • Added EMI and inflation calculator pages.
  • Kept tools lightweight and directly usable from the browser.
PHP Utilities Calculators Hash tools

Personal / operational tooling

Expense management system

Expense tracking and management tool linked from the personal site.

  • Built as a practical operations-focused web tool.
  • Focused on quick entry, tracking, and personal finance visibility.
  • Part of the broader set of lightweight business and productivity utilities.
Expense tracking Web app Operations