I bring over 10+ years of expertise in Java, Spring Boot and Cloud technologies. I have consistently delivered robust, scalable, and maintainable software solutions.
My passion lies in tackling complex challenges head-on and transforming them into elegant, efficient optimize code. Whether you are looking to build a new application from the ground up, optimize an existing system or solve a specific problem, I bring a wealth of experience and a results driven perspective to ensure your project's success.
Let's use Java to make your vision a reality, together.
Key Technologies:
✅ Java 8 to 21
✅ Spring MVC, Spring Boot, Spring Cloud Microservices, Spring Security (JWT, OAuth 2.0)
✅ Hibernate, JPA, JDBC
✅ Restful API, GraphQL
✅ Desktop application: JavaFx
✅ Spring Batch, Scheduler
✅ Frontend: JSP, Thymeleaf
✅ Relational DB: MySQL, PostgreSQL, Oracle
✅ NoSQL DB: MongoDB, Elasticsearch
✅ DB Migration: Liquibase
✅ Asynchronous Messaging: Apache Kafka, RabbitMQ
✅ Build Tool: Apache Maven, Gradle
✅ Version Controller: Git, GitHub
✅ Testing with Junit, Mockito
✅ API Documentation: Swagger UI
✅ Architecture: Monolithic, Microservice
✅ CI/CD Pipeline: Jenkins
✅ Containerization: Docker
✅ Orchestration: Kubernetes
✅ Cloud: AWS, GCP
✅ Monitoring Tools: Log4j, Slf4j, Datadog
✅ Code Quality Tools: SonarQube, Black Duck, Harbor, SecHub Scan
✅ Performance Testing Tool: JMeter
✅ Server: Apache Tomcat
✅ Realtime Scheduler: Quartz
✅ API Integration (Office365, Twilio)
✅ Libraries: Apache POI
✅ Agile Methodologies: Jira, Confluence, Scrum, Sprint Planning, Standup, Retrospectives
✅ Business & Technical Analysis: Requirements Gathering, Risk Analysis, Technical Design, Application Modeling, Implementation Planning and Support
Favorite Topics:
⭐ Problem Solving Ability.
⭐ Provide Efficient Optimized Solutions.
⭐ Maintaining Good Quality Code.
⭐ Accepted Challenges That Allows Me to Learn New Skills.
⭐ Test Driven Development.
⭐ Always Prioritize Security Aspects.
⭐ Build automation.
Domain Expertise:
✅ Manufacturing
✅ E-Commerce
✅ Education Services
✅ Applicant Tracking System (ATS)
✅ Customer Relationship Management (CRM)
Let’s Connect ! 🎉
If you’re looking for a dedicated backend Java developer who can deliver results, I’d love to discuss your project further. Feel free to reach out, and let’s create something amazing together!
Thank You
Java
Spring Boot
REST API
Spring Framework
Spring MVC
Microservice
JavaFX
Spring Data MongoDB
Spring Security
DevOps
Spring Cloud
Java GUI
Hibernate
Apache Kafka
Web Development
Sandip D.
Kolkata, India
$40/hr
4.9
44 jobs
I am a Senior Fullstack Engineer specializing in Python, Node.js, PHP, React, Go, API integrations, automation, AI-powered systems, real-time applications, and scalable backend architecture
Over the last 11+ years, I have built and maintained production systems ranging from intelligent web automation and data extraction platforms to EV charging infrastructure, trading bots, real-time WebSocket applications, distributed background-processing systems, and AI-powered developer tools.
My focus is not just on writing scripts that work once. I build reliable, maintainable, production-ready systems that can handle failures, retries, concurrency, authentication, sessions, large datasets, and constantly changing external platforms.
Core Expertise:
----------------------------
* Python & Django backend development
* REST API design and third-party API integrations
* Web scraping and intelligent browser automation
* Selenium, Scrapy, BeautifulSoup & XPath
* AJAX/API-based data extraction
* Authentication, sessions, cookies & browser-state management
* PostgreSQL, Redis & database optimization
* Celery, background workers & asynchronous processing
* WebSockets & real-time applications
* AWS cloud infrastructure
* Docker, Linux, Nginx & production deployments
* Trading bots & algorithmic trading systems
* AI agents, LLM integrations & intelligent automation
* Data processing and workflow automation
Advanced Automation:
----------------------------
I specialize in building automation systems that behave intelligently rather than following a simple sequence of steps.
My systems can handle changing page structures, authentication flows, API failures, retries, rate limits, session expiration, unexpected responses, and other real-world exceptions without requiring constant manual intervention.
Whenever possible, I work directly with underlying APIs and network requests instead of relying entirely on browser automation, resulting in significantly faster and more reliable systems.
Backend & Distributed Systems:
--------------------------------------
I have extensive experience designing backend systems involving:
* Django / Python
* PostgreSQL
* Redis
* Celery
* RabbitMQ
* REST APIs
* WebSockets
* AWS
* Docker
* Linux
* Nginx
* OpenSearch
* Microservices and distributed services
I have also worked extensively on EV charging platforms using OCPP and OCPI protocols, where reliability, concurrency, real-time communication, transaction consistency, and large-scale device communication are critical.
AI & Intelligent Systems:
----------------------------
My recent work also includes AI-powered applications and automation using LLMs and AI agents.
I am particularly interested in combining traditional backend engineering with AI to create systems that can analyze information, make decisions, recover from unexpected situations, and automate complex workflows.
Trading Automation:
----------------------------
I also develop automated trading systems involving:
* Real-time market data
* WebSocket feeds
* Technical indicators
* Strategy automation
* Futures and options
* Order management
* Position tracking
* Risk management
* Backtesting systems
* Trading dashboards
What I Can Build For You
If your project involves backend engineering, APIs, complex automation, web scraping, AI agents, real-time systems, trading automation, or scalable Python applications, I can help you design and build it from architecture to production.
I care about solving the underlying engineering problem—not just delivering a script that works on my machine.
Python
PHP
Amazon Web Services
Java
jQuery
Selenium WebDriver
Android App Development
Regex Writing
Facebook Development
Data Scraping
Syed N.
Kolkata, India
$50/hr
5.0
21 jobs
🏆 Top 1% Globally · I turn business ideas into AI-powered, scalable MVPs for non-technical founders. 10+ years building startup tech that handles 100K+ users. Skip the tech headaches – I architect, build, and scale your vision while you focus on growth.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🚀 Your On-Demand Tech Co-Founder
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Hey there! 👋 I'm Nasim, your fractional CTO and startup sherpa 🧗♂️. When non-technical founders get stuck choosing between expensive agencies and risky solo developers, I become your third option - a battle-tested technical partner who actually ships.
Here's the reality we're fixing together:
😩 "Our last dev disappeared with half-finished code" → I deliver production-ready MVPs
😤 "We keep hitting scaling walls" → I build cloud-native systems that grow smoothly
🤯 "AI sounds amazing but we don't know where to start" → I implement practical AI solutions that create real value
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
📈 Real Results From Real Clients
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
⭐ “Nasim was an instrumental part of our project, and his contributions have been nothing short of exceptional.”
⭐ “Nasim works well and delivers as agreed under minimum supervision. He has an amazing insight into programming, building applications and cloud operation.”
⭐ “This was the second time working with Nasim and it has always been a pleasure.”
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
💡 How We'll Win Together
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🤖 AI That Actually Works (No Science Projects!)
→ ChatGPT integrations that wow users
→ RAG systems that make your data smarter
→ Predictive analytics that drive decisions
→ All deployed in production-ready architectures
⚡ MVP Development Without the Headaches
→ From napkin sketch to working prototype in weeks, not months
→ Golang backends that won't crumble under pressure
→ Clean Node.js APIs that frontend devs love working with
→ User testing baked into every iteration
🌱 Architecture That Grows With You
→ Microservices designed for your future team
→ DevOps automation so you can sleep at night
→ API development that connects all your tools
→ Security and scalability built-in, not bolted on
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🛠️ My Tech Toolkit (No Buzzword Bingo Here)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
☁️ Cloud Stuff
→ AWS/GCP deployments that don't waste your money
→ Kubernetes when you need it, Serverless when you don't
→ Terraform configs even your junior devs can understand
🧠 AI/ML
→ LLM orchestration that doesn't break the bank
→ Custom model training when off-the-shelf won't cut it
→ LangChain implementations that actually work in production
💾 Data Power
→ PostgreSQL setups that handle your first million users
→ Real-time analytics that help you make smarter calls
→ Redis caching that makes your app feel lightning-fast
📱 Web & Mobile
→ React/Next.js frontends that convert
→ Backends that make your mobile devs send thank you notes
→ WebSockets for features that feel magical
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🤝 Let's Build Something Amazing
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
If you're:
✅ A founder tired of tech chaos
✅ An exec needing AI strategy that works
✅ A team ready to build right the first time
...then let's chat! ☕
👉 Quick question? → DM me anytime
No sales pitches - just real talk about your project and how we can make it shine ✨
P.S. Even if we don't end up working together, I'll give you at least one actionable idea to move forward. That's my promise 🤝
Software Architecture & Design
AI Development
Minimum Viable Product
Solution Architecture
Back-End Development
Golang
Cloud Architecture
Technical Project Management
API Development
DevOps
Microservice
Startup Consulting
Product Strategy
Node.js
Agile Software Development
Deep Kumar P.
Kolkata, India
$15/hr
5.0
3 jobs
🚀 Elevate Your Web Presence with a MERN Maestro! 🚀
Hello, Digital Visionaries! I'm your next go-to MERN Stack Wizard, where coding meets creativity to turn your web dreams into reality. With a keyboard as my wand and a profound passion for MongoDB, Express.js, React, and Node.js, Python I craft seamless, dynamic, and responsive web applications that not only look fantastic but perform like a dream.
💡 Why Me? 💡
Innovative Solutions: I think outside the box. Your project isn’t just another task on my list; it’s the next masterpiece waiting to be unveiled.
Quality and Speed: With me, you get the best of both worlds - premium quality web applications delivered at lightning speed.
Responsive Design Guru: I ensure your site is a visual treat on any device, enhancing user engagement and satisfaction.
Performance Optimizer: Speed is the name of the game. I fine-tune every line of code for optimal performance, ensuring lightning-fast load times.
Security Shield: Your web application will be a fortress, safeguarded against the digital threats of the modern world.
🌟 Let’s Make Magic Happen! 🌟
Embark on a journey with me where each line of code leads to innovation, growth, and success. Ready to transform your ideas into digital excellence? Let’s connect and create something spectacular together!
React
JavaScript
TypeScript
MongoDB
ExpressJS
Redux
OpenAI API
Amazon EC2
Docker
Git
Tailwind CSS
Web Application
API
Generative AI
Llama 2
Bidhan B.
Kolkata, India
$25/hr
5.0
9 jobs
With over 15 years of experience in software engineering, I help businesses build intelligent, scalable, and production-ready applications powered by Artificial Intelligence, Large Language Models (LLMs), cloud infrastructure, and modern web technologies.
I specialize in designing end-to-end AI solutions that combine custom software development, GPU infrastructure, server deployment, and intelligent automation. From startup MVPs to enterprise platforms, I transform complex business requirements into reliable, high-performance systems.
My expertise includes deploying and optimizing open-source LLMs such as Gemma, Kimi, Llama, Qwen, Mistral, and DeepSeek on cloud GPUs and on-premise servers. I build AI-powered applications including AI Agents, Retrieval-Augmented Generation (RAG), multimodal systems, chatbot platforms, document intelligence, inventory management, video analytics, and business intelligence dashboards.
I can design and deploy complete AI infrastructure using NVIDIA GPUs (L4, L40S, RTX PRO, H100, H200), Kubernetes, Docker, Ollama, vLLM, DeepSpeed, and TensorRT, ensuring maximum performance, scalability, and cost efficiency.
My development expertise covers modern backend, frontend, mobile, and cloud technologies, allowing me to deliver complete production-ready solutions from architecture to deployment.
AI & Machine Learning
• Large Language Models (LLMs)
Gemma
Kimi
Llama
Qwen
Mistral
DeepSeek
Phi
Ollama
vLLM
Hugging Face Transformers
• AI Solutions
AI Agents
Agentic AI
RAG Systems
Vector Databases
Semantic Search
AI Chatbots
Knowledge Base Systems
Document AI
OCR
Vision AI
Video Analytics
Recommendation Systems
AI Automation
Prompt Engineering
Fine-tuning
Function Calling
MCP Integration
Server & Infrastructure
AI Server Design
GPU Server Deployment
NVIDIA GPU Setup
CUDA
TensorRT
DeepSpeed
Kubernetes
Docker
Docker Compose
Linux
Ubuntu
Nginx
Apache
Redis
RabbitMQ
PostgreSQL
MySQL
MongoDB
Cloudflare
I can install, configure, optimize, and maintain:
Gemma
Kimi
Llama
Ollama
Open WebUI
vLLM
CUDA Toolkit
NVIDIA Drivers
GPU Monitoring
AI Inference Servers
Cloud Platforms
Google Cloud Platform (GCP)
Amazon Web Services (AWS)
Microsoft Azure
DigitalOcean
Services
Compute Engine
Kubernetes
Cloud Run
EC2
ECS
Lambda
Azure VM
GPU Instances
Storage
CDN
Load Balancer
Networking
Backend
Laravel
PHP
Node.js
Express
Python
FastAPI
Django
REST API
GraphQL
WebSocket
Microservices
Frontend
React
Next.js
Vue.js
Angular
JavaScript
TypeScript
HTML5
CSS3
Tailwind CSS
Bootstrap
Mobile
Flutter
React Native
Android
Kotlin
Java
Swift
iOS
Databases
PostgreSQL
MySQL
MongoDB
Redis
Elasticsearch
Milvus
ChromaDB
Pinecone
FAISS
DevOps
Docker
Kubernetes
GitHub Actions
GitLab CI/CD
Jenkins
Linux Administration
Server Security
Monitoring
Auto Scaling
Industries
✔ Artificial Intelligence
✔ Business Intelligence
✔ Warehouse Management
✔ Inventory Management
✔ Retail
✔ E-commerce
✔ Manufacturing
✔ Logistics
✔ Healthcare
✔ Education
✔ SaaS Platforms
What I Can Build
✔ AI ChatGPT-like Applications
✔ AI Business Intelligence Dashboards
✔ Inventory Management Systems
✔ Warehouse AI
✔ AI Video Analytics
✔ Computer Vision Applications
✔ Enterprise ERP Systems
✔ CRM
✔ E-commerce Platforms
✔ Shopify Apps
✔ AI Automation Platforms
✔ Custom SaaS Products
✔ Mobile Applications
✔ Cloud-native Applications
✔ Enterprise APIs
Why Work With Me?
• 16+ Years of Professional Experience
• End-to-End Solution Architecture
• Production-Ready AI Systems
• Cloud & On-Premise Deployments
• LLM Deployment & Optimization
• GPU Server Installation & Configuration
• Clean, Maintainable Code
• Scalable System Architecture
• Excellent Communication
• Long-Term Support
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