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My specific expertise is web design and development in the Ruby-on-Rails and WordPress frameworks. I have experience in AI-based vibe coding, AI integration and AI product troubleshooting/completion. I provide the entire website life-cycle: web design, development and web site maintenance. I develop sites for all levels - startup to full enterprise site. One of the highest-rated developers on UpWork - with a "Top-Rated" badge and a 100% job success rating. I focus on efficiency and quality. I do not provide you with a 'less than credible' price estimate then leave you with a broken or unfinished product. I stand ready to help large and small entrepreneurs successfully build their website or web app while respecting their unique budget constraints.

I help startups and product teams build, fix, and scale mobile apps (iOS, Android, and Flutter), including apps with AI-powered features—ensuring stability, performance, and long-term reliability. With 7+ years of experience and 50+ apps delivered, I’ve worked on production apps used by real users where performance, stability, and user experience directly impact business outcomes. Clients usually come to me when: • Their app is crashing, slow, or unstable in production • Payment flows or API integrations are failing • New features are breaking existing functionality • They need to scale an app without compromising performance • AI features (chat, automation, recommendations) need to be integrated or fixed • Legacy code needs safe refactoring and long-term maintainability What I deliver: • Stable, high-performance mobile apps ready for real users • Clean, scalable architecture for long-term growth • Reliable API and payment integrations • Smooth App Store & Play Store submission and updates • AI-powered features integrated into mobile apps (chat, automation, smart workflows) My expertise includes: • Native iOS (Swift, Objective-C) & Android (Kotlin, Java) • Cross-platform apps using Flutter & React Native • AI integrations and backend-driven intelligent features • Debugging crashes, ANRs, memory leaks, and performance issues • Refactoring legacy code and improving app architecture • Backend integration using Python (Django, Flask, FastAPI), Java, and Node How I work: • I solve root problems, not temporary fixes • I prioritize stability before adding new features • I write clean, maintainable, and scalable code • I leverage modern AI tools to speed up development and debugging without compromising quality • I communicate clearly and ensure timely delivery CTA: If you're building a new app or facing crashes, performance issues, or scaling challenges, send me a message with your app details. I’ll review your requirements and suggest the best way to move forward quickly and safely.

I build AI systems that run in production. Not demos, not prototypes that fall apart under real load Most of my work falls into three areas: - Voice agents and conversational systems: I recently built an inbound communications platform for a US law firm on AWS Bedrock, Amazon Connect, and Nova Sonic. The system handles client intake calls, captures the details, and routes qualified leads into their case management workflow. Multi-tenant, with proper logging and human fallback. I also work with Vapi, Retell and ElevenLabs when those are a better fit for the budget or timeline - RAG and document AI: Knowledge assistants over a client's own documents and data, with citations and guardrails so the answers can be trusted. I pick the retrieval setup based on the use case rather than defaulting to whatever framework is trending. Used in production for legal intake, customer support and internal knowledge bases - AI in business workflows: Connecting LLMs to the systems a business already runs on. I've done this for e-commerce operations on Amazon Vendor Central and SP-API, for inbound communications platforms and for ops teams drowning in spreadsheets. The work usually involves Airtable, BigQuery, AWS Lambda, Stripe and similar tools, with an LLM in the middle doing classification, extraction, summarization or decisioning Stack I actually use: - AWS Bedrock, Amazon Connect, Nova Sonic, Lambda, EC2, SES, S3 - Anthropic Claude, OpenAI GPT models - Node.js, Python (FastAPI), Next.js - Supabase, PostgreSQL, Airtable, BigQuery - Vapi, Retell AI, ElevenLabs, Twilio - Amazon SP-API, Stripe How I work: - Fixed scope, fixed price, weekly demos. I'd rather tell you upfront if a project is the wrong fit than take it on and miss the mark. I run a small services team (Eveonix), so I can scale up with engineers when a project needs it or handle it solo when that's faster Most of my clients have been on Upwork for years and have worked with several developers before me. The reviews on this profile reflect that. If you have a specific use case, send me the details and I'll tell you honestly whether I can help and what it would cost

𝗜 𝗮𝗺 𝗮 𝗦𝗲𝗻𝗶𝗼𝗿 𝗳𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝘄𝗶𝘁𝗵 𝟭𝟮+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗰𝗼𝘂𝗽𝗹𝗲𝗱 𝘄𝗶𝘁𝗵 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 in Python 3, FastAPI, Django/ Django REST Framework, Flask, JavaScript, NodeJS, ExpressJS, PHP/ Laravel, RESTful API, JWT(JSON Web Token), JSON, XML, Elasticsearch, Apollo/ GraphQL, AWS EC2, S3, ELB, REDIS, Amplify, Serverless Lambdas, Terraform, API Gateway, Azure, Google Cloud Platform, MySQL, Postgres, MongoDB, Supabase, Docker, Docker Swarm, Kubernetes k8, Microservices architecture, Linux, etc. My expertise extends to HTML5, CSS3, jQuery, Vue.js, React.js, Next.js, Nuxt.js, Angular(up to version 19), Bootstrap 4/5, TailwindCSS, Material UI, SCSS, SASS, etc. And, I have solid experience with DevOps, including CI/ CD, Git, etc. I'm proficient in Git for version control and utilizing Docker containers for seamless deployment. 𝗔𝗜 𝗧𝗼𝗼𝗹𝘀 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲: 𝗖𝘂𝗿𝘀𝗼𝗿 𝗔𝗜 | 𝗥𝗲𝗽𝗹𝗶𝘁 | 𝗟𝗼𝘃𝗮𝗯𝗹𝗲 | 𝗚𝗼𝗛𝗶𝗴𝗵𝗟𝗲𝘃𝗲𝗹 | 𝗔𝗶𝗿𝘁𝗮𝗯𝗹𝗲 | 𝗕𝗮𝘀𝗲 𝟰𝟰 | 𝗢𝗽𝗲𝗻𝗔𝗜 | 𝗛𝘂𝗴𝗴𝗶𝗻𝗴 𝗙𝗮𝗰𝗲 | 𝗖𝗹𝗮𝘂𝗱𝗲 | 𝗖𝗼-𝗣𝗶𝗹𝗼𝘁 | 𝗠𝘆 𝘃𝗮𝗹𝘂𝗲-𝗮𝗱𝗱𝗲𝗱 𝘀𝗸𝗶𝗹𝗹𝘀: ✅Ability to collaborate effectively with a team of developers, QA's, etc. ✅Excellent problem-solving and analytical skills. ✅Strong work ethic and attention to detail. ✅Ability to learn quickly and adapt to new technologies. ✅Regular meetings on project status/ updates. ✅Scrum, Kanban, Agile, Jira, Jenkins, Experience. ✅Degree in the Computer Science field. I have used Git for version control for efficient collaboration, code versioning, branching, and merging. I also used platforms like GitHub, GitLab, and Bitbucket to provide additional collaboration features. I am fluent in English and possess excellent written and verbal communication skills. PS- As a full-stack Web & Mobile developer, I believe in complete transparency. My pricing is clear and upfront, no hidden fees, no surprise costs. I stand by my work with a portfolio of verified client reviews on Upwork that reflect consistent, honest delivery. When you're choosing a developer, trust and clarity should come standard, and that's exactly what I offer. Let's connect.

⭐️⭐️⭐️Senior Full Stack & AI Developer | Next.js, Node.js, NestJS | AI Chatbots & SaaS | Cybersecurity Expert⭐️⭐️⭐️ Are you looking to build a secure, high-performance AI platform that actually scales? With 6+ years of full-stack engineering expertise, I specialize in bridging the gap between complex AI logic and robust, secure web architecture. I don't just write code—I build intelligent, production-ready systems designed for data integrity, speed, and real-world business results. Why My Clients Choose Me: Unlike generalist developers, I combine Full Stack proficiency (Next.js/NestJS) with AI-native engineering (LLMs/Agents) and a Cybersecurity-first mindset. Whether you need an AI-powered SaaS, an automated workflow, or a secure backend API, I deliver clean, maintainable, and audit-ready code. 🚀 Core Expertise AI & Intelligent Automation Custom AI Chatbots: Specialized in OpenAI, Gemini, and LangChain. AI Agents: Building autonomous workflows that handle tasks, data processing, and decision-making. SaaS Integration: Embedding LLMs directly into your product’s core functionality. Full Stack Web Development Modern Frontend: Next.js, React, TypeScript, Tailwind. Scalable Backend: NestJS, Node.js, Express, REST/GraphQL. Data & Security: PostgreSQL, MongoDB, Supabase; Secure Authentication (JWT, OAuth), and API protection against common vulnerabilities. 🛠 Tech Stack Snapshot Frontend: React, Next.js, TypeScript, Redux, Tailwind. Backend: Node.js, NestJS, Express.js, GraphQL. AI: OpenAI, Gemini, LangChain, Prompt Engineering, AI Agents. Databases: PostgreSQL, MySQL, MongoDB, Supabase, Firebase, Prisma. DevOps & Security: Docker, CI/CD, Nginx, Vercel, AWS S3. 🌟 What My Clients Say “10/10 experience. Zee goes above all your requirements. He’s consistent, highly professional, and communicates clearly. A reliable Full Stack Developer for complex web and AI integrations.” “This work exceeded my expectations. Zeeshan delivered a high-quality AI-powered MVP using Next.js, NestJS, and PostgreSQL. His expertise in full-stack architecture and AI development is outstanding.” 📩 Let’s Build Something Great I am currently accepting new projects. If you are ready to move from a concept to a secure, scalable, and intelligent product, click the "Invite to Job" button. Let's discuss how we can leverage AI to solve your specific business challenges.

Get $100 AWS Credit + a complimentary, No-Strings-Attached AWS Cloud Assessment. ⭐⭐⭐⭐⭐ "Rarely have I worked with someone as skilled and thorough as Carlos is. Setting up my team on git, configuring our AWS servers to be safe, scalable, and fast, working with my developers to optimize code, being a good person". James Rector, UPWORK 100+ 5-star projects, I'm one of highest-rated and highest-earning AWS freelancer on UPWORK. I have been helping SaaS businesses to build scalable, secure, highly available and high-performing environments on AWS following DevOps/Dev Ops best practices. Here is what I can help you with: ✅ Review of your AWS current architecture performance, security and costs ✅ Architecture of new AWS infrastructure and Data Pipelines ✅ Migrations to AWS, AWS Cost Reduction, Database Optimisations, DevOps Engineer ✅ Managed Services SLA Problems that I solve: ⚡️ Performance At Scale: I build and deploy industry-tested and proven infrastructure code that ensures your application runs and performs fast without compromising security. ⚡️ Cost Optimisation: My infrastructure architecture enables the efficient use of resources and can help you save up to 90% in your AWS costs ⚡️ Security & Compliance: I can help you Scale and innovate quicker while building a solid foundation that will help you maintain a secure, compliant environment. ⚡️ Training & DevOps. I can help you increase your team's technology adoption while automating your DevOps/ Dev Ops processes. Technologies that I adopt and I'm an expert at: ➡️. AWS services such as s EC2, ECS, EKS (Kubernetes), S3, RDS, Step Functions, Lambda, AWS Gateway API, DynamoDB, Beanstalk, Elasticache, SNS, SES, IAM, ControlTower, WAF, Shield, Cloudformation, Cloudfront, CloudWatch, VPC, Route 53, Certificate Manager and others. ➡️. Supporting services such as CDK, Terraform, Rancher, ISTIO, Prometheus, Grafana, Teleport, Papertrail, Graylog, New Relic, Dynatrace, DataDog, Kafka, NEO4J and Spot.io. ➡️. Strong CI/CD DevOps engineering using GitHub/BitBucket Pipelines, CircleCI, ARGOCD. Industries: - FinTech - Media - Ecomm - and more! Here are some of the case studies of the clients I have helped with: 1. MONETRACK - Deploying a client stack in minutes on AWS instead of weeks Industry: Finance Problem: An unreliable process that caused constant frustration and delays. Process: Each deployment would take days to weeks to be set up, requiring between 5-6 people. Results: They now deploy a client stack in minutes instead of weeks using AWS EKS and a customised CI/CD process. In addition, I have: · Improved deployment time from weeks to minutes. · 80% reduction in costs per deployment. · Secure alignment with their client's compliance requirements. 2. Tourism Media - Great flexibility, deploying applications faster and secure on AWS Industry: Media Problem: With no CI/CD integration across all deploys, the job to integrate each stack was inconsistent and pruned to errors. Process: Deployment was not consistent across the board; they were also not resource-friendly Result: They can now push out a consistent deployment process across the company while being quickly adopted by their teams. In addition, I also have: · Improved deployment time by 60% · 70% costs reduction in EC2 instances · Greater scalability and reliability than their Legacy infrastructure. 3. Value-Ad - Scale 10X more on AWS with great stability and without the extra cost. Industry: Finance Problem: An infrastructure that could not scale securely and effectively was harming their client base. Solution: Deploy a new AWS EKS (Kubernetes) environment that is scalable, highly available, secure (PCI-DSS compliant) and cost optimised using AWS Well Architect Framework best practices. Result: They can now handle 10X more requests with excellent stability and without extra cost than their legacy infrastructure. In addition, I have added: · Greater scalability and reliability · Deployments are simplified and done in minutes instead of hours · 32% cheaper than its previous infrastructure Now a bit of myself: I'm a passionate professional with 25 years of experience in enabling business strategies through the practical application of technology architecture principles, practices, and tools. User-centric and solution-oriented, I have managed projects and teams across Australia, New Zealand, the USA, Brazil, the UK, Ukraine, Singapore, Vietnam and India over the past 14 years. A problem-solver in a broad range of technology stacks covering Architecture, Development, Integration, Data, Infrastructure, and Support. Seamless configuration and migration include fast deployment of critical and complex workloads on the cloud with hands-on expertise in AWS Services. Send me a message. I would love to discuss your project.