I help businesses build production-ready AI applications, scalable SaaS platforms, high-performance APIs and workflow automation systems that solve real business problems. With 11+ years of full-stack software development experience, I specialize in Python, FastAPI, Node.js, TypeScript, React, Next.js and modern AI/LLM integrations. From architecting reliable backend systems and integrating AI agents to automating complex workflows and modernizing existing applications, I deliver secure, maintainable solutions built for production and long-term growth. 🚀 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀: FastAPI, Typescript (Node.js/Express.js/Nest.js), Laravel, Yii, Php8.0 🚀 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀: React.js, React Native, Next.js 🚀 𝐇𝐞𝐚𝐝𝐥𝐞𝐬𝐬 𝐂𝐌𝐒: Strapi, Ghost, Contentful, Wordpress 🚀 𝗔𝗜 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: N8N, Zapier, Open AI, Cursor 🚀 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲: MySQL, PostgreSQL, MongoDB, GraphQL(Yoga/Hasura/Prisma), Supabase, Firebase 🚀 𝗪𝐞𝗯 𝐬𝐞𝗿𝘃𝗶𝐜𝐞𝐬, Event Web Hooks & Sockets 🚀 𝗔𝗣𝗜: - Payment Gateway - Paypal, Stripe, Squarespace, Transferwise, FalconX, Fireblocks, Uniswap - GoHighLevel, Kartra, Clickfunnels, Active Campaign, GetResponse, ConvertKit, Salesforce, Mailchimp, Sendgrid, AWS S3 & Digital Ocean Spaces Cloud, Godaddy (Reseller), Amazon MWS & Ebay, Rocketshipit, Twillio, Nexmo, Telefacil, Esendex, Google, Facebook Graph, Linkedin, Dropbox, Duda, Sumsub, Cryptocompare, Coingeko, Auth0, Canvas, Nextcloud 🚀 𝗨𝗻𝗶𝘁 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: Chai, Mocha, Jest, Sinon, Playwright 🚀 𝗗𝗲𝘃𝗢𝗽𝘀: Vagrant, Docker, XAMPP, Kubernetes 🚀 𝗖𝗼𝗱𝗲 𝗩𝗲𝗿𝘀𝗶𝗼𝗻𝗶𝗻𝗴 𝗧𝗼𝗼𝗹𝘀: Github, Bitbucket, Gitlab, Beanstalk 🚀 𝗛𝗼𝘀𝘁𝗶𝗻𝗴𝘀: AWS, Heroku, Netlify, Render, Vercel, Pantheon, DigitalOcean, Godaddy, Google Cloud 🚀 𝗔𝗴𝗶𝗹𝗲 𝗧𝗼𝗼𝗹𝘀: Asana, Jira, ClickUp, Figma, Notion If you're looking for a developer who can take ownership of your project, communicate effectively and deliver high-quality solutions on time, I'd be happy to discuss how I can help. Let's connect and bring your vision to life.

I build production-ready data systems and backend infrastructure for companies that need their data reliable, highly queryable, and 100% automated. If your team is still manually exporting CSVs from SaaS tools every week, dealing with fragile pipelines, or struggling to scale database architecture, I design the systems that eliminate those bottlenecks. Here is how I help clients scale: █ 1. DATA ENGINEERING & WAREHOUSING I specialize in moving massive data volumes between disparate sources, databases, and warehouses while ensuring absolute data integrity, scheduling, and monitoring. • Enterprise Cloud Migration: Migrated 367M+ rows across 5 national well & gas datasets from on-prem SQL Server to Snowflake via Azure Data Factory (including year-based partitioning for 275M+ row tables) with zero data loss. • Custom Pipeline Development: Developed a Python pipeline converting ESRI Geodatabase files to GeoParquet, loading 96 spatial layers into Snowflake using native GEOGRAPHY columns. • Database Architecture: Built a regulatory database covering 354 interstate pipeline operators and 275K fact rows (2011–2025). • Multi-Source Warehousing: Engineered an Azure-provisioned (Terraform/Docker) PostgreSQL warehouse consolidating NetSuite (SuiteQL) and SharePoint (Graph API) data to feed daily operational PowerBI dashboards. • Financial Syncs: Automated a 68-entity QuickBooks Online + Turvo TMS synchronization into PostgreSQL with secure OAuth2 authentication and scheduled refreshes. • Automated Ingestion: Set up a T-1 Crude Oil database managing 6+ OCR Excel layouts with robust deduplication logic and automated GIS enrichment. █ 2. BACKEND SYSTEMS & CUSTOM INTEGRATIONS I engineer API-heavy backends and third-party integrations where data reliability and complex business logic cannot afford to fail. • AI-Driven Automation: Built an AI applicant review system processing ~300 forms/day using 26 deterministic rules combined with LLM edge-case handling, featuring custom forms, SSO, and a two-way HubSpot sync. • E-Commerce Infrastructure: Developed a high-performance custom product builder utilizing Next.js 15 App Router, Express, Prisma, and PostgreSQL, optimized with GA4 e-commerce tracking and JSON-LD for SEO. • Marketplace Integrations: Built an Amazon Selling Partner API integration for order/inventory sync, settlement reconciliation, and 7 custom Streamlit analytics reports. ──────────────────────────────────────── TECHNICAL PROFICIENCIES • Cloud & Infra: Azure (Data Factory, Functions, Blob, SQL), AWS (Lambda, RDS), Terraform, Docker, PM2 • Databases & Warehouses: Snowflake, PostgreSQL, SQL Server, MySQL, MariaDB • Data/ETL Stack: Python, pandas, geopandas, pyarrow, openpyxl, GeoParquet, Databricks • Backend & Languages: Node.js, TypeScript, FastAPI, Flask, Bun, Prisma, SQLAlchemy, T-SQL, PL/pgSQL • Core Integrations: NetSuite, QuickBooks, Amazon SP-API, Microsoft Graph, HubSpot, Turvo, ESRI GDB • AI Orchestration: OpenAI API, Pydantic, Instructor ──────────────────────────────────────── HOW WE WILL WORK TOGETHER I operate as a consultative partner, not just a task-taker. I ask deep structural questions before writing a single line of code to catch architectural flaws early. You will receive proactive progress updates before you ever have to ask for them. Every system I deliver features comprehensive error handling, logging, and monitoring built-in from day one. If you have a complex data pipeline, a broken integration, or a backend system that needs to scale, send me a brief message outlining your current setup. I will give you a clear, objective analysis of the best path forward. barumkhan.dev

🏆 $3M+ Earned on Upwork — Placing Me Among a Very Small Percentage of Freelancers on the Platform Struggling with a web platform that must scale, stay fast, and handle complex business logic? With 25+ years in full-stack development, I've delivered 600+ projects and helped build systems serving 20M+ users with 99.99% uptime across SaaS, ERP, marketplace, and data-platform products. I specialize in end-to-end architecture, React, PHP, Python, and API-first development. 🚀 HOW I CAN HELP YOU Full-Stack Web Development Turn complex product ideas into scalable web platforms that support growth without constant rewrites. I've delivered 600+ projects across 40+ industries, including SaaS, ERP, CRM, marketplaces, and data platforms serving millions of users with 99.99% uptime. SaaS & ERP Development Launch subscription-based systems that streamline operations, automate workflows, and reduce manual overhead. My experience includes building: • Multi-tenant platforms • RBAC systems • Billing engines • Reporting dashboards • Audit trails ...helping businesses reduce operational overhead by 40%+. React & Next.js Frontend Development Increase engagement and conversion with fast, data-heavy interfaces that remain smooth under load. I build: • Dashboards • SPAs • PWAs • Admin panels • Analytics interfaces • Marketplace frontends PHP, Laravel & Symfony Backend Development Build backend architecture that supports growth, complex business logic, and seamless integrations. My expertise includes: • REST APIs • GraphQL APIs • Authentication & Authorization • MySQL • PostgreSQL • Redis • Laravel • Symfony WordPress Custom Plugin & Headless CMS Development Extend WordPress beyond standard templates so it supports custom workflows, improved performance, and modern content management. I build custom plugins and headless CMS solutions for businesses that need WordPress to function as a true application—not just a brochure website. 🏆 RESULTS 🏅 25+ years of hands-on full-stack development 🏅 600+ projects delivered across 40+ industries 🏅 $3M+ earned on Upwork See full case studies in my portfolio below. ✉️ MESSAGE ME ON UPWORK Looking for a full-stack developer to build or improve your SaaS, CRM, ERP, marketplace, or data platform? Message me on Upwork today for a free consultation and practical next steps. I typically respond within 4 hours and can offer quick turnaround for urgent projects. ⚙️ HOW I WORK I plan products using React, Node.js, and TypeScript, then architect the backend with PHP or Python backed by PostgreSQL or MySQL for reliable, scalable data flow. I deploy on AWS, automate releases with GitHub Actions, and use Docker to keep development and production environments consistent. For client-facing products, I integrate third-party APIs, optimize performance, and manage delivery through Jira, ensuring every stage remains transparent and predictable. I build full-stack web applications, architect scalable SaaS and marketplace platforms, integrate APIs, and design cloud infrastructure that is built to grow with your business.

👋 Hello! I’m a Full-Stack Developer with 10 years of experience, specializing in creating clear and modern web applications using React and Node.js. With a 100% Job Success Rate and 2,200+ working hours on Upwork, I’m committed to delivering seamless front-end and back-end solutions. My Skills: - Front-end: HTML5, JavaScript (ES6), TypeScript, React.js, Next.js - Back-end: Node.js, Express, Nest.js, REST APIs - Styling: CSS, SASS, Tailwind CSS, Bootstrap, Material UI - Databases: PostgreSQL, MySQL, Firebase, MongoDB - Tools: Git, Docker, Redux, GraphQL, Redis Industries: MarTech, Real Estate, SaaS, Data Science, Blockchain, NFT, and more. Why Work with Me? - 10 years of proven experience across diverse industries - Full-Stack expertise to handle your project end-to-end - Strong leadership and communication skills Whether you’re starting a new project or updating an existing one, I’m here to bring your ideas to life! 📨 Need an experienced Full-Stack Developer? Let’s chat!

6+ years building full-stack web products that ship on time and hold up in production. I work across the full stack, from React and Next.js interfaces to Node.js and Laravel backends, and I take ownership of the whole thing. What I work on: Web applications and SaaS platforms in React, Next.js, and TypeScript. Backend services, REST APIs, and GraphQL in Node.js, Express.js, and Laravel. JavaScript and TypeScript across both frontend and backend. Third-party integrations and webhooks: Stripe, HubSpot, Salesforce, Twilio, and custom CRM and payment APIs. Real-time features with WebSockets and server-sent events. CI/CD pipelines, automated testing, and deployment on AWS, Docker, and GitHub Actions. Performance optimization and security hardening built in from the start. Core stack: JavaScript, TypeScript, React, Next.js, Node.js, Express.js, Laravel, PHP, PostgreSQL, MySQL, MongoDB, REST APIs, GraphQL, WebSockets, AWS, Docker, GitHub Actions, Vercel, Tailwind CSS, Redux, Zustand Good fit for: SaaS products, internal tools, API integrations, marketplace platforms, e-commerce, web applications, product rebuilds and migrations, startup MVPs. I work within the Softermii team, a full-cycle software and AI development company with 100+ products delivered across healthcare, fintech, real estate, logistics, and e-commerce. We also use Apex, our internal delivery framework, which keeps scope tight, prevents rework, and makes delivery timelines predictable.

Need a Flutter developer who can also build the AI layer your app is missing? I've shipped 30+ mobile apps (10M+ downloads) and built LLM-powered chatbots, RAG pipelines, and AI agents directly into production Flutter apps. Most Flutter developers stop at the UI. I build the full stack: Flutter front end, Python or Node backend, and the AI layer (OpenAI, Claude, Gemini) that makes the app genuinely smarter, not just chatbot-shaped. That combination is rare, and it means one person can own your app from architecture to AI integration to deployment. What I do: Flutter mobile apps: cross-platform iOS and Android apps with Firebase, REST/GraphQL APIs, real-time features, and clean, scalable UI. AI integration: LLM-powered chatbots and assistants, conversational AI, RAG pipelines, and AI agents built into mobile and web products. Backend to support your app: REST APIs and scalable backends in Python (Django, FastAPI), Ruby on Rails, and Node.js, with solid database design and third-party integrations. Recent work: AI medical scribe app for oncology consultations, a real estate app aggregating property data from multiple platforms, voice AI and WhatsApp booking automation for salons and clinics, and a Flutter MVP for a sports activity startup. Proof: Top Rated on Upwork with a 4.87 rating across 31 jobs and 2,899+ hours logged. Certified AI Mobile App Developer (Meta via Coursera) and AI Agent Developer Specialization (Vanderbilt via Coursera). Apps I've built have crossed 10M+ combined downloads. Message me with what you're building and I'll come back with a scoped approach, timeline, and price before we get on a call.

I have over 16 years of professional software development experience, including 5 years of hands-on experience with Oracle FLEXCUBE Core Banking (CBS). Throughout my career, I have designed, developed, enhanced, and maintained enterprise applications for banking and business domains using Microsoft technologies, Oracle databases, and cloud platforms. My core expertise includes: * Oracle FLEXCUBE (CBS) * C#, ASP.NET, ASP.NET Core, .NET Core, Web API * Oracle PL/SQL, Microsoft SQL Server (MSSQL), MySQL, PostgreSQL * Database Migration (MSSQL ↔ MySQL, Oracle ↔ MSSQL, data migration, schema conversion, ETL, and data validation) * Database Administration (DBA) activities, including database installation, backup & recovery, performance tuning, indexing, query optimization, user/security management, monitoring, and maintenance * Java, Entity Framework, Dapper * Angular, JavaScript, HTML, CSS, jQuery * AWS and Azure Cloud * SSRS, Crystal Reports * Git, TFS, Bitbucket, Jira, and Agile development What I can bring to your project: * Clean, scalable, and maintainable code * Strong database design, administration, and performance optimization * Database migration between MSSQL, MySQL, Oracle, and PostgreSQL with minimal downtime and data integrity * Experience integrating APIs and enterprise systems * Fast issue diagnosis and reliable bug fixing * Clear communication and on-time delivery * Ability to work independently or collaborate effectively with your team Having worked as a Senior Developer and Team Lead, I understand both the technical and business aspects of software development. Whether you need a new application, enhancements to an existing system, database migration, database administration, performance tuning, or long-term development support, I can deliver high-quality solutions that align with your business goals. I would be happy to discuss your project in more detail and recommend the most effective approach. I am available to start immediately and look forward to contributing to your project’s success. Thank you for taking the time to read my profile. I hope to speak with you soon! If you’re looking for high-quality work, fast turnaround, and reliable technical expertise at a fair price, please don’t hesitate to contact me.

📢STOP LOSING SLEEP OVER TECHNICAL DEBT, SLOW API RESPONSE TIMES, OR MESSY CODEBASES. 🔍 Are you a founder or an engineering lead looking to build a production-ready platform that scales from day one? I help businesses take complex ideas from concept to successful launch—without the drama, missed deadlines, or communication gaps. 💻 With over 6 years of experience, I bring "Big Tech" engineering standards to your startup or enterprise. Whether you need a rapid MVP built on the MERN/MEAN stack or a high-concurrency, microservices-driven system using GOLANG and ELIXIR, I don't just write code—I engineer scalable business solutions. 🤝 WHAT YOU GET WHEN WE PARTNER: ➡️ Transparent Delivery: Daily updates, short feedback loops, and clear communication. Zero "black box" development. ➡️ Clean, Maintainable Code: Heavy emphasis on proper database design, typed languages, and scalable architecture so your next team can easily understand and extend the product. ➡️ Post-Launch Reliability: I don't just ship and disappear. I provide runbooks, monitoring setups, and pragmatic post-launch support to ensure your platform stays stable. ➡️ Fast Start: Day-one environment setup and a small, risk-free first milestone to prove value immediately. 🚀 CORE SERVICES & USE CASES: 💠 Product Development: Custom SaaS Development, MVP Development, Web Application Development. 💠 System Architecture: Microservices, Event-Driven Systems, High-Concurrency Backends, Database Optimization. 💠 API Engineering: RESTful APIs, GraphQL, Third-Party API Integrations (Stripe, Twilio, OpenAI/LLMs, etc.). 💠 Real-Time Systems: WebSockets, Chat Applications, Live Tracking Dashboards. 🛠 MY TECHNICAL ARSENAL: ➡️ Full-Stack Ecosystems: MERN Stack, MEAN Stack ➡️ Backend & APIs: Node.js (Express.js, Nest.js), Golang (Gin, Fiber), Elixir (Phoenix, LiveView), Python. ➡️ Frontend Development: React.js, Next.js, Angular.js, TypeScript, JavaScript (ES6+), Tailwind CSS. ➡️ Databases: PostgreSQL, MongoDB, Redis, Elasticsearch. ➡️ DevOps & Cloud: AWS, GCP, Docker, Kubernetes, CI/CD Pipelines, Serverless Architecture. Skip the endless scrolling through unreliable profiles. Send me a message today with a brief overview of your project, and let’s outline a clear, actionable roadmap for your first milestone. ⌨ 𝗞𝗲𝘆 𝗪𝗼𝗿𝗱𝘀: Elixir, OTP, Beam, Go, Gin, Phoenix Framework, LiveView, Surface, Drab, Cowboy, Ecto, GraphQL, Nerves, GenServer, Supervisor, Task, Ecto, PostgreSQL, MySQL, MongoDB, Redis, Riak, Golang, Dart, Full-Stack Developer, ReactJS, TypeScript, JavaScript, jQuery, Angular, AWS, Google Cloud Platform, Docker, MEAN Stack, MERN Stack, Front-End Development, HTML5, CSS3, Bootstrap, Azure, DevOps, Kubernetes, WebSockets, SEO-Friendly Web Development, Cross-Platform Development, Next.js, Express.js, Vue.js, React.js development, React frameworks, Git, Tailwind CSS, SASS, SCSS, Gitlab, Gulp, Webpack, Figma, Responsive Design, Cross browser compatibility, Nuxt.js, GitHub, Elixir, Golang, Phoenix Framework, LiveView, Node.js, Gin, Nest.js, GraphQL, PostgreSQL, MongoDB, Redis, Kafka, RabbitMQ, AWS Lambda, Kubernetes, Terraform, AI Chatbots, Machine Learning, LLMs, NLP, OpenAI, FinTech, Healthcare AI, SaaS Development, API Development, DevOps, CI/CD, Docker, Cloud Computing, Microservices, WebSockets, Agile, React, Next.js, Vue.js, TypeScript, Tailwind CSS, Stripe, Twilio, AI Automation, Cloud Infrastructure, Serverless Computing.

Stop losing revenue to inefficient workflows and invisible search rankings. I transform Odoo into a high-performance engine that reduces operational overhead by up to 40% while driving organic growth through technical SEO optimization. With 9+ years of experience bridging the gap between OpenERP 6.1 and the AI-powered Odoo 19, I provide the strategic "Techno-Functional" oversight needed to ensure your digital transformation is both technically sound and commercially profitable. ✅ Core Expertise & Business Impact: 🧑‍💻 ERP Implementation & Migration: I handle high-stakes migrations from QuickBooks, SAP, or legacy Odoo versions, ensuring 100% data integrity and zero downtime. 🧑‍💻 Odoo SEO & E-Commerce Growth: I leverage Odoo's native tools, including WebP image compression, automated schema markup, and advanced sitemap management to improve your Google ranking and conversion rates. 🧑‍💻 Manufacturing & MRP Excellence: I configure real-time KPI tracking for Overall Equipment Effectiveness (OEE) and cycle times, helping manufacturers increase production efficiency by up to 35%. 🧑‍💻 CRM & Lead Conversion: I implement automated lead scoring and pipeline visualization that reduces response times and increases win rates by focusing teams on high-potential opportunities. 🧑‍💻 Sales & Revenue Optimization: I configure advanced quotation templates and automated upselling logic to increase average deal size and streamline recurring subscription revenue. 🧑‍💻 Purchase & Supply Chain Control: I deploy smart reordering rules and vendor bill control policies that optimize inventory turnover and reduce procurement expenses through automated replenishment. 🧑‍💻 Global Marketplace Synchronization: I build "plug-and-play" connectors for Amazon, Shopify, and eBay that automate inventory syncing to prevent overselling and manual errors. 🛠 Technical Proficiency: Languages & Backend: Expert Python, JavaScript (OWL/JS), and PostgreSQL optimization for high-volume datasets. Integrations: Advanced API development (XML-RPC/REST) to link Odoo with third-party tools like Xero, Quickbooks, and custom shipping carriers. Infrastructure: Hardened server configuration on Ubuntu/CentOS and expert management of Odoo.sh environments. 🚀 Why Work With Me? 🧑‍💻 Top Rated Performance: A consistent 98% Job Success Score reflects my commitment to quality and client satisfaction. 🧑‍💻 Techno-Functional Dual Power: I can design your business workflows (Functional) and then build the custom modules to support them (Technical). 🧑‍💻 Version Mastery: Extensive hands-on experience across every major version (OpenERP 7 to Odoo 19.0 Community & Enterprise). 🧑‍💻 Proven Results: Successfully led over 100 implementations, migrations, and complex integrations for global clients. Let’s build an Odoo system that works as hard as you do.

I'm a Software Engineer with 7 years of development experience and the founder of two businesses: a web agency and a two-sided event staffing marketplace. I've been on both sides of the table, so I know what it takes to deliver work that actually moves the needle for your business. What I build: Custom web applications (React, Next.js, TypeScript) Backend systems and APIs (Node.js, Supabase, PostgreSQL, Stripe Connect) Admin dashboards, multi-role portals, and real-time platforms Production apps shipped to the Apple App Store via Capacitor Why I'm different: Before becoming a developer, I spent 15+ years in hospitality and events, managing teams, operations, and customer relationships. That background means I communicate clearly, respond quickly, and genuinely understand what it's like to run a business. You won't have to chase me down or decode technical jargon. My flagship project is a live, two-sided marketplace with 75+ routes, Stripe Connect payouts, real-time messaging, and row-level security on every table. I've also shipped a customer support portal with a three-tier role system, audited and hardened an inherited codebase, and delivered MVPs that turned ideas into working products. Whether you need a custom web app, a platform with payments and user roles, or a technical partner who can take your idea from concept to launch, I'm ready to help.