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I’m a Principal Full Stack Engineer and Software Architect with 15+ years of experience designing and scaling SaaS, AI, Fintech, Healthcare, and E-Commerce, and now evolving those platforms with AI-driven capabilities. I design architectures where LLMs, embeddings, and data pipelines work alongside robust APIs, enabling automation, insight generation, and conversational interfaces inside enterprise products. I’ve worked across the full company spectrum: • Startups that needed rapid MVPs, lean architectures, and fast iteration • Scaleups where performance, stability, and automation become critical • Enterprises with complex compliance, multi-team collaboration, and long-term architectural planning My Teck Stacks & Specializations: • Frontend: React, Next.js, TypeScript, Tailwind, Material UI • Backend: Node.js (Express, Nest.js), Python (FastAPI, Django), Java, C#, REST, GraphQL, WebSockets AI & Data: LLMs, RAG pipelines, embeddings, vector DBs, LangChain, LlamaIndex, ETL/ELT • Cloud & DevOps: AWS, Azure, GCP, Docker, Kubernetes, Terraform, CI/CD (GitHub Actions, Azure DevOps) • Databases: PostgreSQL, MySQL, MongoDB, Redis, DynamoDB • E-Commerce / CMS: Shopify, WooCommerce, WordPress (custom plugins, headless setups) I specialize in system and database architecture, designing platforms that handle complex business logic, high traffic, and real-time data at scale. I build distributed ecosystems using domain-driven design, microservices, and event-driven patterns, supported by resilient messaging workflows, serverless compute, and horizontally scalable APIs. From orchestrated services to autonomous event pipelines, and from optimized relational models in PostgreSQL/MySQL to high-throughput document and cache layers in MongoDB and Redis, I ensure every layer of the system is tuned for performance, reliability, and seamless growth. On the product side, I’ve built and optimized Shopify, WooCommerce, and custom WordPress solutions - integrating payments, automating operations, and improving conversions through smart architecture and automation. Clients value me for translating complex requirements into intuitive, high-performance applications while leading projects with transparency and efficiency. Every engagement is about long-term reliability. I ensure that what we build today continues to support tomorrow’s growth.

Full Stack AI SaaS Engineer | Building Cloud-Native, AI-Driven SaaS Platforms | Java/Spring Boot, LLMs, AWS & GCP, React, Next.js, Flutter I’m Shahzad, a Certified Java Architect with 10 + years of experience building scalable, high-performance SaaS applications, now focused on integrating AI and automation into modern cloud products. I’ve engineered AI-powered SaaS platforms that combine conversational intelligence, LLM pipelines, and serverless cloud infrastructure. My passion is turning complex workflows into simple, intelligent, user-friendly applications that scale globally. ------------------------------------------------ What I Build: AI-Driven SaaS Products: Multi-tenant cloud apps powered by LLMs (GPT, Claude), RAG, and custom ML APIs Conversational & Voice AI Agents: Twilio + n8n + GPT workflows for 24/7 automation (healthcare, enterprise) Data Intelligence Apps: predictive analytics, anomaly detection, recommendations, and real-time dashboards Cloud-Native Architectures: Java/Spring Boot microservices, REST/GraphQL APIs, and event-driven backends ------------------------------------------------ Core Stack: Backend & Cloud: Java (8 → 25), Spring Boot 3, AWS (Lambda, S3, RDS), GCP (BigQuery, Vertex AI), Docker, Kubernetes AI/ML: Vertex AI, OpenAI API, BigQuery ML, Python (NumPy, Pandas, Scikit-learn), RAG, LLM Integration Frontend: React, Next.js, TypeScript, Tailwind, Flutter (for cross-platform mobile apps) Integrations: Twilio, Stripe, Shopify, BigCommerce, REST/SOAP APIs, Kafka, RabbitMQ ------------------------------------------------ DevOps & Data: CI/CD pipelines with GitHub Actions & Jenkins Cloud monitoring & observability (CloudWatch, GCP Logging) SQL (PostgreSQL, MySQL) & NoSQL (MongoDB, Redis) ---------------------------------------------------- Certifications: Oracle Certified Java Programmer (2022) AWS Certified Developer – Associate (2023) Amazon Machine Learning Specialty (2023) Spring Boot 3 & Spring 6 Architect (2020) SAS Programming Essentials (2023) ------------------------------------------------ Let’s Build Something Smart: Whether you’re launching an AI-powered SaaS platform, a voice or chat agent, or a data-driven product, I can help you design and deliver a system that’s intelligent, scalable, and future-ready.

Your backend shouldn't be what keeps you up at night. I build systems that perform under real load, scale without drama, and stay maintainable long after launch. 9+ years building production backend systems. 100% Job Success Score. Delivered for startups, SaaS companies, fintech platforms, and enterprise teams across Canada, USA, Germany, UK, Switzerland, Ireland, and Denmark - including Daimler AG (Mercedes-Benz). Go is my primary language - APIs, microservices, concurrent systems, AI-assisted pipelines. PHP (Symfony, Laravel) for complex business applications. Frontend when the project needs it, but backend is where I operate. What I build: ▪️ High-performance APIs and microservices - Go, PHP, RESTful ▪️ AI-assisted backend systems and dynamic data pipelines ▪️ Payment integrations - Stripe, Klarna, PayPal, Adyen, Fortis ▪️ Databases and query optimisation - PostgreSQL, MySQL, MongoDB, Redis ▪️ Cloud and DevOps - AWS, DigitalOcean, Docker, Kubernetes, CI/CD ▪️ Async systems - RabbitMQ, event-driven workflows Industries: SaaS platforms, fintech and payments, e-commerce, enterprise tools and workflow automation. If you need backend built to last - not just to ship - let's talk.

Full Stack Engineer & AI Developer | 8+ Years Building Production Systems I build full stack web apps, AI tools, and automated workflows that handle real traffic, real users, and real money. What I specialize in: AI & LLM Applications including RAG pipelines, AI chatbots, conversational AI, document processing, semantic search, and AI agents. Production-grade tools, not API wrappers. Full Stack Web Applications from MVPs to enterprise platforms. Shipped fintech apps, SaaS products, healthcare systems, e-commerce stores, dashboards, and real estate platforms. Workflow Automation with n8n and AI that replaces hours of manual work. Email triggers, PDF parsing, data extraction, Slack notifications, CRM updates, invoice processing, web scraping, all on autopilot. GoHighLevel (GHL) CRM & Sales Ops covering sub-account setup, opportunity pipelines, Conversation AI for SMS and web chat, Voice AI agents that answer calls and book appointments, workflow automations, missed-call text-back, round-robin assignment, nurture sequences, A2P 10DLC, and white-label SaaS-mode rebilling. Tech I work with: Frontend: React, Next.js, Angular, Vue, TypeScript, Tailwind, Redux Backend: Node.js, NestJS, Express, Django, FastAPI, Flask, Python, .NET, C#, REST, GraphQL AI/LLM: LangChain, OpenAI, Claude API, Gemini, Hugging Face, Pinecone, RAG, vector databases, prompt engineering Automation & CRM: n8n, GoHighLevel (GHL/HighLevel), Zapier, Conversation AI, Voice AI, A2P 10DLC, Twilio, LC Phone, LC Email, webhooks, web scraping Databases: PostgreSQL, MongoDB, Redis, Supabase, MySQL, Elasticsearch Cloud & DevOps: AWS, GCP, Azure, Docker, Kubernetes, CI/CD, Vercel Not limited to these. I pick whatever works best for your project. Some things I've done over the past 8 years: Built a fintech trading platform that processed $15M+ in transactions Shipped a SaaS product to 10,000+ active users with 99.9% uptime Set up n8n pipelines that killed 20+ hours/week of manual data entry Built RAG systems that improved search accuracy by 85% for enterprise clients Migrated a legacy Python 2.7 codebase to Python 3.10 in under 2 months Improved React frontend load times by 40% through performance work Built a full GoHighLevel system for roofing companies with opportunity pipelines, Conversation AI, Voice AI for inbound calls, missed-call text-back, and round-robin routing that turned after-hours leads into booked appointments How I work: Honest timelines, not padded ones. Daily updates, clean code, and a product that actually works. Most projects fail because of poor communication, not bad code, so I overcommunicate. 30 days of bug fixes after launch because I don't disappear once the project is done. Got a project in mind? Send me the details and I'll get back to you within a few hours. Keywords: Full Stack Developer, React Developer, Next.js Developer, Angular Developer, Node.js Developer, NestJS, Python Developer, Django, FastAPI, TypeScript, .NET Developer, C# Developer, ASP.NET Core, GraphQL, REST API, AI Developer, AI Engineer, LLM Application Developer, RAG Developer, LangChain, OpenAI, Claude, Gemini, Pinecone, Vector Database, Prompt Engineering, AI Chatbot, Conversational AI, AI Agent, Generative AI, n8n, Workflow Automation, Web Scraping, Zapier, GoHighLevel, GoHighLevel Expert, GHL, GHL Expert, GHL Developer, HighLevel, GHL Snapshot, GHL Workflows, GHL Voice AI, GHL Conversation AI, Voice AI Agent, Opportunity Pipelines, CRM Automation, Sales Funnel Automation, Missed Call Text Back, A2P 10DLC, LC Phone, LC Email, Twilio, SaaS Mode, White Label CRM, Lead Generation Automation, Round Robin Lead Routing, Appointment Booking Automation, Roofing CRM, Contractor CRM, Med Spa CRM, Real Estate CRM, Agency CRM, PostgreSQL, MongoDB, Redis, Supabase, Elasticsearch, AWS, GCP, Azure, Docker, Kubernetes, Stripe, Shopify, WordPress, Microservices, SaaS Development, Bot Development, WebSockets, DevOps, CI/CD, Clean Architecture, JWT, OAuth, Vercel

𝗝𝗮𝘃𝗮 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 🖥️, 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁 🌱, 𝗠𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀 🛠️, 𝗔𝗪𝗦 ☁️, 𝗥𝗘𝗦𝗧 𝗔𝗣𝗜𝘀 🔗 I help businesses build scalable, secure, and high performance backend systems that handle growth without slowing down. Most applications work well in the beginning. The problems start when traffic increases. APIs become slow, deployments become risky, and maintaining the code becomes expensive. That's where I come in. 𝗔𝘀 𝗮 𝗦𝗲𝗻𝗶𝗼𝗿 𝗝𝗮𝘃𝗮 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝘄𝗶𝘁𝗵 𝟭𝟯+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲, I've helped startups and enterprise companies design, build, and optimize backend systems that scale reliably in production. I am not just a Java Developer who writes code. I help businesses create backend architectures that support growth, improve performance, and reduce technical debt. 𝗥𝗲𝘀𝘂𝗹𝘁𝘀 𝗜'𝘃𝗲 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 • Built scalable Java Developer solutions serving thousands of daily users with high availability. • Designed Microservices architectures that reduced deployment risks and improved system reliability. • Developed Spring Boot applications that improved API response times and backend performance. • Helped businesses migrate legacy systems into modern Java Developer architectures. • Delivered production ready backend platforms for startups and enterprise organizations. Every project starts with a business goal and ends with measurable results. 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗼 𝗝𝗮𝘃𝗮 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • Custom backend application development • Enterprise Java solutions • Legacy application modernization • Backend performance optimization • Secure and maintainable architecture 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • REST API development • Spring Security • Spring Data JPA • Authentication and authorization • Scalable backend services 𝗠𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 • Distributed systems design • Service decomposition • API Gateway implementation • Event driven architecture • System scalability and resilience 𝗔𝗪𝗦 𝗖𝗹𝗼𝘂𝗱 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀 • AWS deployment and infrastructure • EC2, ECS, Lambda • Cloud architecture design • Monitoring and optimization • Cost effective cloud operations 𝗥𝗘𝗦𝗧 𝗔𝗣𝗜 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • API design and implementation • Third party integrations • Payment gateway integration • Documentation and testing • Secure API architecture 𝗪𝗵𝗮𝘁 𝗠𝗮𝗸𝗲𝘀 𝗠𝗲 𝗗𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁 Most Java Developers focus only on writing code. I focus on the business impact of the software. 𝗕𝗲𝗳𝗼𝗿𝗲 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗮𝗻𝘆𝘁𝗵𝗶𝗻𝗴, 𝗜 𝗮𝘀𝗸: • Will this architecture still work when traffic grows? • Can future developers maintain it easily? • Is it secure? • Is it optimized for performance? • Can it scale without major rewrites? This approach helps clients avoid costly problems later. 𝗪𝗵𝗼 𝗜 𝗪𝗼𝗿𝗸 𝗕𝗲𝘀𝘁 𝗪𝗶𝘁𝗵 • Startups building new SaaS products • Businesses scaling existing applications • Companies modernizing legacy Java systems • Teams adopting Microservices architecture • Organizations migrating workloads to AWS • Businesses needing secure and scalable REST APIs 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 Java, Spring Boot, Spring Security, Hibernate, JPA, Microservices, AWS, Docker, Kubernetes, REST APIs, Kafka, RabbitMQ, PostgreSQL, MySQL, MongoDB, Redis, Maven, Gradle, Git, CI/CD, Jenkins 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲 • 13+ years of Java Developer experience • Clean, maintainable code • Scalable backend architecture • Strong communication • Reliable delivery • Long term technical thinking If you're looking for a Java Developer who understands both software engineering and business objectives, let's discuss your project. Send an invitation and I'll respond within a few hours. Keywords: Java Developer, Senior Java Developer, Java Backend Developer, Java Software Engineer, Spring Boot Developer, Spring Boot Expert, Java Application Development, Enterprise Java Developer, Java Web Services, REST API Developer, RESTful API Development, Backend Developer, Backend Engineer, Microservices Developer, Microservices Architecture, Distributed Systems, AWS Developer, AWS Cloud Engineer, Java AWS Developer, Docker, Kubernetes, Kafka, RabbitMQ, Hibernate, JPA, Spring Security, API Integration, Database Design, PostgreSQL, MySQL, MongoDB, Redis, SaaS Backend Development, Scalable Application Development, Cloud Native Applications, Java Consultant, Software Architecture, System Design, Enterprise Application Development, Performance Optimization, CI/CD, Jenkins, Maven, Gradle, Full Stack Java Developer.

🚀 AI and AWS Certified Fullstack SAAS Developer building since 2016 with 100% Job Success 🚀 Worked as a Sr. Software Engineer at U.S. Enterprise; "SolarWinds" (~$729M ARR + 300K+ customers). 🚀 Worked as Lead Engineer at "Ericsson (4G/5G)" their 2025 Net Sales was SEK 236.7 billion. 🚀 Worked on both Web and Mobile Apps for "Strava" AI driven Fitness-tracking & Social Networking SAAS Platform (~$2.2B Valuation, ~180M+ users) with GPS-powered exercise logging. During the past 10 years, I have gained hands-on experience in end-to-end Software Development (MVP + SAAS). I helped building, scaling, and modernizing production systems for Startups and large Enterprises alike. I can help with: - MVP & SAAS Development - Web and Mobile Application Development - Frontend and Backend Development - Chrome Extension Development - AI App Development. AI Chatbots and AI Agents - Machine Learning, NLP, LLMs, RAG - CRM and ERP integration + Development - Monolith to Microservices architectures - Cloud Engineering / DevOps - Automations (n8n, Make, Zapier) - AI-driven coding tools (GitHub Copilot, Claude code) - Low-code / no-code tools (Bubble, Retool, Lovable, Bolt, Airtable, Base44) - eCommerce / Shopify Stores 🏆Snapshot of my Technical Skills and Stacks: 🎯Frontend Development: • React, Next.js, Vue.js, Nuxt.js, Angular, Svelte • Redux, Redux Toolkit, MobX, Vuex, Pinia, Context API • CSS3, SASS/SCSS, TailwindCSS, Styled-Components, Emotion, HTML/CSS • SPA, PWA (Offline support, push notifications) 🎯Backend Development: • Node.js (Express, NestJS, Fastify), Python (Django, Flask, FastAPI), PHP (Laravel) • RESTful APIs, GraphQL APIs, WebSockets & Real-Time APIs • Third-Party Integrations (Stripe, PayPal, CRM, Twilio, Sendbird, Google Analytics / GA4, Mailchimp / SendGrid, Google Maps API, Mapbox) • Multi-tenant SaaS, Microservices & Service-Oriented Architecture • Event-Driven Architecture: Queues and message brokers (RabbitMQ, Kafka, Pub/Sub) • Background Jobs & Scheduling: Celery, BullMQ, Sidekiq 🎯 Authentication & Security • Auth0 / Okta / Firebase Auth • OAuth2 / OpenID Connect • JWT – Token-based authentication 🎯Databases: • PostgreSQL, MongoDB, Redis, Firebase / Firestore, Neo4j • Elasticsearch / OpenSearch 🎯AI & LLM Integration: • GPT-4/4o, Claude, LLaMA, LangChain, RAG pipelines • Embeddings, fine-tuning, multi-agent systems • Vector databases (Pinecone, Weaviate, FAISS) 🎯DevOps & Infrastructure: • AWS (Amazon Web Services): EC2, ECS, EKS, Lambda, RDS, S3, CloudFront, Route 53, CloudWatch, Secrets Manager, IAM, DynamoDB, Aurora, Elastic Beanstalk • Google Cloud Platform (GCP): Compute Engine, Cloud Run, Cloud Functions, Cloud SQL, Firestore, BigQuery, Cloud Storage, Pub/Sub • Microsoft Azure: Virtual Machines, Azure Functions, Azure SQL, Blob Storage, Cosmos DB, App Service, Key Vault • Serverless Hosting: AWS Lambda, Google Cloud Functions, Azure Functions for scalable microservices • Traditional Hosting & VPS: Nginx, Apache, cPanel setups, managed WordPress hosting, dedicated servers • Containerization: Docker, Docker Compose • Orchestration: Kubernetes (EKS, GKE, AKS), Helm Charts, deployment pipelines • Version Control & Pipelines: Git, GitHub Actions, GitLab CI/CD, Bitbucket Pipelines, Jenkins • Infrastructure as Code (IaC): Terraform, AWS CloudFormation • Monitoring & Metrics: Prometheus, Grafana, CloudWatch, Datadog, New Relic • Centralized Logging: ELK Stack (Elasticsearch, Logstash, Kibana), OpenSearch, Sentry 🚀 Highlights of my SUCCESS STORIES: ✔ I developed Web, Chrome extension, Android/iOS apps for Coursology “AI Homework Helper,” with a user base of over 600,000 students ✔ I developed and implemented Web + Mobile apps for “Total Dental Healthcare” at 13 Bay Area locations. ✔ I worked with Keyfree Technologies Inc. and developed both hardware and software solutions that facilitate P2P rentals, fleet management, anti-theft, connected services, insurance integration. Why Work With Me? ✅ Proven Track Record; Delivered 50+ projects on time, with excellent client retention ✅ Clean Code & Best Practices; SOLID, DRY, Test-driven ✅ Fluent English communication and Agile Workflows 📩 Click Invite or DM me!