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I help businesses stabilize, scale, and extend existing applications without costly rewrites. With 15+ years of experience, I specialize in Java (Spring Boot) and Laravel-based systems, focusing on bug fixing, performance optimization, API development, and long-term maintenance for SaaS and enterprise applications. If your application is slow, unstable, hard to maintain, or needs new features added safely — I can help. What Can I Help You With - Fixing critical bugs and production issues - Improving performance and database efficiency - REST API development and third-party integrations - Refactoring legacy Java / PHP applications - Secure authentication and role-based access - Ongoing maintenance and technical support Why Clients Trust Me - 15+ years building and maintaining real-world systems - $70K+ earned and 5,000+ hours on Upwork - Long-term contracts (1,000+ hours) with US & UK clients - Strong focus on clean, maintainable, and scalable code Technical Stack - Backend: Java, Spring Boot, Spring Security, Hibernate, JPA, PHP, Laravel - Frontend: Angular, React - Databases: MySQL, SQL Server - Tools: REST APIs, JUnit, Mockito, Git

With 15+ years of experience in extensive list of technologies, I am able to provide you with high quality, sophisticated, robust solutions that are well tested, efficient, accurate. I shine at diving into your existing codebase, find the source of issues, and resolve them without breaking another thing. If you have old legacy code, or a vibe coded program that is not working, I can fix them up for you to clean and conscious code. Need to automate? Got your back. Data processing, parsing complex PDF? Sure thing! You need it, if there is solution for it, I can get it done. Technologies I am currently working with: Rust, Python, Axum, SQLAlchemy, FastAPI, Django, PostgreSQL, SQLite, HTMX, ReactJS, Tailwindcss, RunPod, AI/LLM I am a passionate software engineer who enjoys challenges, and finding solutions. I have extensive experience of diving into existing code, finding issues, and resolve them. As a hardworking, resourceful engineer who also loves automating things, that usually saves a lot of time, I can provide the best service for the most reasonable costing. Besides developing data mining applications, automation tools, Websites, I have personal interest in Open Source projects. Here's a list of, but not limited to, responsibilities I have successfully fulfilled: ◾️ Desktop application ◾️ Refactoring ◾️ Prompt Engineering (Local LLM) ◾️ Machine Learning ◾️ Web development ◾️ Web Scrapers ◾️ Email processing ◾️ Distributed applications ◾️ ETL ◾️ Automation ◾️ Server configuration and deployments ◾️ Bug fixing and code improvements ◾️ High Performance computing Let's get in touch.

Expert Developer | PHP Laravel | Python FastAPI Django | Java Spring Boot | AI Agent Development | LLM Integration | RAG Pipeline | AI Data Engineer | Vector Database | Redis | MySQL | PostgreSQL | PgVector | React | FinTech | Payment Systems | MFS - Mobile Financial Service | Go | Rust | C/C++ | NodeJs | Kafka | RabbitMQ | High-Performance Microservices | Event Driven Design | Domain Driven Design | AI Chatbot | 7+ years of professional experience | I build backend products that ship and stay fast under load — Laravel apps delivered end-to-end, FastAPI services with AI/RAG wired in properly, and payment systems moving real money. If you need a Laravel product built or rescued, an LLM feature integrated without turning your codebase into a prototype, or a slow API diagnosed and fixed, that's my lane. 7+ years of professional experience, including bKash (Bangladesh's largest mobile financial service, millions of daily transactions) and 2.5 years working remotely with SELISE, a Zürich-based software company, on Swiss and European enterprise projects. => SELECTED WORK ## PHP Laravel product delivery (Aerotia International + open source) Delivered a CMS-driven corporate website end-to-end for an aviation & marine solutions distributor: Laravel 12 (PHP 8.2) JSON API with a Blade admin CMS and a React 18 + TypeScript frontend, live in production — plus a Laravel 9 ledger/accounting portal for the same client. I also author and maintain laravel-gitstamp, an MIT-licensed open-source Laravel package CI-tested across Laravel 10–12. Earlier professional Laravel work includes a healthcare-planning app and a government HR reporting system. — details and code in my Portfolio. ## AI RAG pipeline over S3 document stores (Python/FastAPI) Built a retrieval-augmented generation pipeline that ingests and indexes documents directly from S3 buckets — OpenSearch (kNN, HNSW, cosine similarity) for semantic search, sentence-transformer embeddings, and Redis caching that cut repeat-query latency from 45-150 seconds down to under 200ms. FastAPI backend, fully containerized. Teams query their document archives in natural language instead of digging through them manually. — details and code in my Portfolio. ## AI Assistant with hardened edge security Built and hardened a production AI chat assistant for this portfolio: found and fixed a leaked API key exposed in a client-side bundle by moving secrets into a Cloudflare Worker as an encrypted proxy. Added origin allowlisting, per-IP rate limiting (20 req/60s), 30s timeouts, and field-level request validation. Diagnosed and fixed compounding latency bugs via observability — cut model response time from 6.1s to 2.3s. Grounded on parsed CV/context docs with confirmed-action triggers for safe user interactions. — details and code in my Portfolio. ## Fintech core payment platform (bKash) Contributed to microservices architecture for a payment platform handling millions of daily transactions. Optimized database queries and Redis caching strategies, improving response times by 40%. Led a zero-downtime Spring Boot 2→3 production migration of a live PIN-reset service — Jakarta EE namespaces, AWS SDK v1→v2 (DynamoDB Enhanced Client), reactive Kafka — with no service interruption on a system where downtime means real customer impact. ## Enterprise IoT platform (Swiss client, via SELISE) Built a multi-tenant IoT middleware for an electric vehicle/aerospace manufacturer, processing millions of data points in real time. Extended the open-source ThingsBoard platform with custom rule nodes, an MBUS decoder, and Swisscom network integration (Java, PostgreSQL, Cassandra, TimescaleDB, WebSocket). I'm also a merged contributor to ThingsBoard itself. ## Online Judge platform (Rust/Axum) Competitive-programming judge built as microservices, deployed via Kubernetes Helm with KEDA autoscaling on Kafka consumer lag — workers scale with actual load instead of running fixed capacity 24/7. => HOW I WORK Async-first and timezone-flexible, with clear documentation and milestone-based delivery so you can course-correct early. I hold my own code to the same standard I enforced as a mentor and reviewer at bKash: 85%+ test coverage, clean commits, CI/CD from day one. Message me with what you're building — I'll give you a straight read on scope and approach before you commit to anything. Key differences from the version stored in Upwork_analysis.md earlier: the keyword line now opens with the exact title phrases (helps Upwork search match title ↔ overview), the hook sells "Laravel built or rescued + AI integrated cleanly" instead of fintech-first, and bKash moved to #4 — still prominent for credibility, but no longer contradicting a Laravel-led title. All Laravel claims remain verified against the portfolio repo.

13+ years experienced in Java/J2EE | AWS Certified(SAA , DVA, CloudOps) | Java Professional Certified | Docker | Kubernetes | Rest API | Spring boot | Spring AI | Microservices| Spring Security | JPA | Oracle | Mysql | Process Mining | MCP | OpenAI | OPENAPI I React Js| ZK UI | Grafana | Prometheus | EJB Certified | 7 years in Financial or Banking application | Agile/Scrum | Lead Team.

👋 I help startups, businesses, and international clients build scalable backend systems, AI-powered applications, SaaS platforms, fintech/payment solutions, and modern full-stack software. I am a Software Engineer with 3.5+ years of industry experience, specializing in Java, Spring Boot, Python, React, AI Agents, LLM Integration, Microservices, Redis, RabbitMQ, Kafka, gRPC, SaaS, Fintech, and Payment Application Development. My focus is on building clean, secure, scalable, and production-ready software systems that solve real business problems. 🚀 Core Expertise Areas ⚙️ Backend Engineering & Architecture - Java, Spring Boot, Python - RESTful API design and development - Microservices architecture - Redis for caching and performance optimization - RabbitMQ and Kafka for messaging and event-driven systems - gRPC-based service-to-service communication - Scalable backend system design - Secure authentication with OAuth and JWT - Clean, maintainable, and performance-focused code 🤖 AI Agents & LLM Integration - AI agent development - LLM integration into backend systems - AI-powered automation tools - Chatbot and assistant-based systems - AI workflow development - Backend services enhanced with AI capabilities 💳 SaaS, Fintech & Payment Development - SaaS platform development - Fintech and payment application development - Payment workflow development and integration - Business dashboards and admin panels - User management and role-based access - Secure and scalable API ecosystems 🌐 Frontend Development - React frontend development - Responsive and user-friendly interfaces - API integration with backend systems - Dashboard and admin panel UI development 🛠️ DevOps, Databases & Deployment - Docker, Linux servers, CI/CD pipelines - Cloud-ready application deployment - PostgreSQL, MySQL, MSSQL, Oracle, MongoDB - Backend performance optimization - Long-term maintenance and system improvement 🧠 AI Development Tools I Use I am proficient with modern AI-assisted development tools, including: - Codex - Claude Code - OpenCode - Gemini CLI 🌍 Open-Source Contributions I also contribute to open-source projects, including: - OpenClaw / ClawdBot - PyTorch ✅ Systems I Can Help You Build - AI agents and LLM-powered applications - SaaS platforms - Fintech and payment applications - Java Spring Boot backend systems - Python backend services - Microservices-based applications - API-driven business platforms - React dashboards and admin panels - Event-driven systems using RabbitMQ or Kafka - High-performance backend communication using gRPC - Scalable systems using Redis caching ✅ What I Help Clients Achieve - Build scalable and secure backend systems - Integrate AI and LLMs into real applications - Develop SaaS, fintech, and payment platforms - Improve backend performance and architecture - Build clean REST APIs and microservices - Create reliable full-stack business applications - Turn product ideas into production-ready software 🧩 Skills Java, Spring Boot, Python, React, AI Agents, LLM Integration, SaaS Development, Fintech Development, Payment Application Development, Backend Development, Full-Stack Development, Microservices, REST API, API Integration, gRPC, Redis, RabbitMQ, Kafka, PostgreSQL, MySQL, MSSQL, Oracle, MongoDB, Docker, Linux, CI/CD, OAuth, JWT, Codex, Claude Code, OpenCode, Gemini CLI. ⭐ Why Clients Hire Me - I build complete solutions, not just isolated features - Strong backend and full-stack engineering experience - Experience working with international business clients - Ability to integrate modern AI tools into real software systems - Focus on clean code, scalability, security, and production readiness - Comfortable working on both new product development and existing system improvement 🎯 Ideal Projects I Work On - Java Spring Boot backend development - LLM integration into SaaS or business applications - Python backend development - Fintech and payment application development - SaaS platform development - Microservices architecture - AI agent development - API development and integration - React frontend development - Backend performance optimization If you need a reliable software engineer to build scalable backend systems, AI-powered tools, fintech/payment applications, or SaaS platforms, I can help you design, develop, and deliver it properly.

Oracle Certified Professional (OCP) Senior Software Engineer specialising in AI native Java, Spring, Web, mobile apps, and SaaS products. I help startups and businesses build scalable backend systems, enterprise platforms, and white-label mobile apps, and automate their CI/CD pipelines for fast, reliable deployments. What I deliver: - Java & Spring Boot microservices - Hybrid & native mobile apps (Flutter / React Native) - SaaS and white-label multi-brand solutions - Hospital Management Systems (HMIS), EHR, HL7 integrations - High-volume transactional SMS & IVR systems - Learning Management Systems (LMS) - AI integrations & AI content generation - CI/CD automation (GitHub Actions, Fastlane, Codemagic) - App Store & Play Store deployment - Automated pipeline deployment Tech stack: Java, Spring Boot, Microservices, AWS, Docker, Flutter, React Native, CI/CD, GitHub Actions, Fastlane, Codemagic, HL7, EHR, OpenAI API, SMS/IVR systems Open for Technical partner From code to production — I build, automate, and scale.