I’m a Senior Full-Stack Developer & Software Architect with 12+ years of experience building scalable, high-performance applications for USA-based enterprise clients and multibillion-dollar brands. I specialize in designing and delivering end-to-end solutions — from architecture to deployment — with a strong focus on clean code, scalability, and long-term maintainability. In the last 2+ years, I’ve also been working extensively with AI-powered solutions, integrating LLMs (Claude, OpenAI) into real-world applications such as chatbots, automation tools, and intelligent data processing systems. Backend Expertise C#, .NET Core, ASP.NET MVC, Web API, Node.js, Python Building secure, scalable, and high-performance APIs and microservices Frontend Development React.js, Angular, Blazor, Vue.js, TypeScript Modern, responsive, and user-friendly UI development AI & Automation (Latest Focus) Claude API & OpenAI integrations RAG (Retrieval-Augmented Generation) systems AI chatbots & workflow automation Prompt engineering & document processing AI-assisted development using Cursor Cloud & DevOps Azure (App Services, Functions, API Management) AWS (Lambda, S3, SQS, SNS, DynamoDB) Docker, CI/CD pipelines, Azure DevOps Database Expertise MS SQL Server, PostgreSQL, MySQL, MongoDB, Redis Architecture & Best Practices Microservices, DDD, SOLID principles, Clean Architecture

Summary of Qualifications 1. Specialist on Mainframe Z/OS, AS/400 iSeries ,Windows Server 2019, UNIX and Linux systems. 2. Mainframe Development COBOL, JCL, VSAM, CICS 3. Development on AS/400 RPG/400, RPG ILE, CL/400, COBOL/400, SQL/400 4. Micro Focus Development COBOL, NetCOBOL, PeopleSoft 5. Data Migration on Mainframe and AS/400 to SQL Server and other Database 6. Development on Visual Studio 2022 - C#, VB.NET, ASP.NET 7. Development on Visual Studio - VB6, Visual FoxPro 9 8. Php/ MySql, ,HTML, XML, JavaScript, jQuery 9. Specialist Implement, maintain and customize ERP Systems (JD Edwards, Baan ERP) 10. Implement and maintain backend and Database of JD Edwards, Baan ERP System - BPCS, JD Edwards, Baan ERP Systems in AS/400 11. Open source Programs (Joomla, Zencart, Magento, Drupal,) 12. SAP/R3, SAP Business One Education: 1. Bachelor of Science in Information Systems - 1991, ACTON University – UK 2. Diploma in Computer System Design National Institute of Business Management (NIBM), Sri Lanka 3. Diploma in Computer System Design DMS Computer Center 4. Diploma in Advance Programming IDM Computer Studies Colombo, Sri Lanka 5. Advance Diploma in Computer Hardware Engineering 6. Advance Programming in JAVA Languages Career History 2009–2014 Acentria Solutions, Dubai, UAE Information Technology Manager- Habitat Hotel, Jeddah. KSA  Implement and maintain backend and Database of JD Edwards, Baan ERP System  Customize of JD Edwards, Baan ERP System reports in AS/400  Development Implement and maintain backend and Database of JD Edwards, Baan ERP System  Customize and Implement Application Software for organization ( RPG/400, RPG ILE, CL 400, Visual Basic .NET 2005, C#)  Monitoring & maintaining the internal network , WLAN & FIBER OPTICAL , Enhancing and operating on WIN 2003 SERVER , ISA SERVER 2006,MAIL EXCHANGE SERVER  Hardware and software maintenance.  MSSQL 2000, ORACAL 9i Servers Maintained and troubleshooting  Developed and enhance PAYROLL System – Developed in Microsoft Visual Studio 2005  Installation and support of systems, networking, devices, software and hardware equipment.  System support on technical and programming solutions. TECHNICALSKILLS  Php/ MySql, ,HTML, XML, JavaScript, jQuery  Open source Programs (Joomla, Zencart, Magento, Drupal,)  Microsoft Visual Studio 2005, 2008 ( VB.NET, C#.NET)  Microsoft MQL Server 2005, 2000  RPG/400, CL/400, COBOL/400, SQL/400  Oracle 9i  SAP/R3  Java  ASP

Need a .NET Full Stack Developer for your product / project or an eCommerce platform even custom web-based application? I can build scalable, production ready software using ASP.NET Core, C#, React, JavaScript, TypeScript, SQL Server, Azure, REST APIs, and AI/LLM integrations and many more with modern frameworks. I help startups, founders, agencies, and growing businesses to build and improve modern software products, if you are launching a new MVP and Prototypes, extending an existing application, modernizing legacy systems, integrating third-party services, or improving performance, reliability, and maintainability I can be the best fit for this. My focus is on SaaS applications, eCommerce software, admin dashboards, internal business systems, cloud-based platforms, and API-driven products and any custom application. What I can help you with: Full-stack web development with .NET / ASP.NET Core, C#, React, JavaScript, and TypeScript SaaS development including multi-tenant architecture, authentication, user roles, subscription flows, admin panels, dashboards, and workflow automation eCommerce development including product catalogs, cart and checkout flows, order management, payment gateway integration, and back-office systems Backend development with Web API / REST API, business logic, third-party integrations, and secure, scalable services Cloud deployment on Microsoft Azure, including app hosting, storage, serverless functions, background jobs, and deployment workflows Database design and optimization using SQL Server / SQL, with a focus on performance, clean schema design, and reliable data handling AI/LLM features such as chat assistants, smart search, workflow automation, content generation tools, and Claude/OpenAI-powered integrations I write clean, maintainable code and build software with long-term usability in mind. I care about clear communication, thoughtful architecture, performance, security, and delivering solutions that support real business goals, not just completed tasks. Whether you need a developer to build a SaaS platform from scratch, improve a React frontend, extend an ASP.NET Core backend, optimize SQL queries, deploy to Azure, integrate APIs, or add practical AI functionality, I can help turn requirements into reliable software.

Oracle Database 12c Certified Oracle Database 11g Certified Oracle Database 10g Certified Oracle Database 8i Certified Oracle Apps DBA Certified R12 Oracle Certified Specialist (General Ledger , Payable) Working Experience Oracle DBA / Head of I.T for more than 25 years

Most data problems show up the same way, whether it's a spreadsheet someone updates by hand every week or a pipeline that's quietly started giving numbers nobody trusts. I build and fix ETL pipelines, warehouses, and API integrations on GCP and AWS, from replacing manual copy-paste with automated pulls to cutting a client's warehouse costs by ~50%. Tell me what's manual or what feels off, and I'll give you a straight read on what it'll take to fix it. Over the last 3 years I've delivered 55+ data projects across finance, healthcare, energy, and e-commerce, from one-off ETL jobs to platforms processing billions of records a day. I work GCP-first (BigQuery, Airflow, dbt, Dataflow), and I'm comfortable across AWS, Postgres, and the messy real-world stack most teams actually have. What I build: - End-to-end ETL/ELT pipelines in Python, SQL, Airflow, and dbt - BigQuery / Snowflake / Redshift warehouses and data models that stay clean as they grow - Migrations off legacy jobs and on-prem databases — without losing data in the move - Metabase, Looker Studio, and Power BI dashboards your team will actually open - Query and cost optimization when your warehouse bill stops making sense - API integrations with proper logging, retries, and checkpoints, so failures are visible instead of silent You probably need me if: - Your pipelines break and you hear it from a stakeholder, not an alert - Reports run slow, cost too much, or quietly disagree with each other - A previous developer left and nobody fully understands the setup anymore - You're scaling fast and the current data stack is starting to crack A few real results: - Architected pipelines processing 5B+ records daily at 99% reliability - Cut a client's warehouse costs ~50% by migrating legacy jobs to BigQuery - 4× throughput and 70% faster ingestion on an API pipeline pulling 2K+ domains a day - 40% faster pipeline runs through Airflow optimization How I work: a clear yes/no on feasibility before you commit, regular updates, and no disappearing mid-project. Most clients come back — usually because fixing one thing surfaces the next. If that sounds like your situation, send a short note on what's breaking or what you're trying to build, and I'll tell you straight what it'll take.

Hello I'm Jay, I’ve worked on building end-to-end data systems for more than 11 years, including: Data pipelines (ETL/ELT) from multiple sources (APIs, databases, files) Batch processing(Spark), Streaming processing(Flink) Modern data warehouses (BigQuery, Snowflake, Redshift) Data transformation and modeling using dbt Interactive dashboards (Power BI / Tableau) Web scraping and structured data extraction API integration and workflow automation AI-powered analytics using OpenAI / LLMs 💡 Why choose me: Strong engineering + analytics background (not just visualization) Experience with modern data stack (ELT, dbt, cloud warehouses) Focus on business value, not just technical delivery Clear communication and fast iteration(English, Cantonese) ⏰ Availability (Global Time Zones) (🇨🇳 Beijing) UTC+8, available 08:00 AM – 02:00 AM (🇬🇧 London) UTC+0, available 12:00 AM – 06:00 PM (🇺🇸 New York) UTC-5, available 07:00 PM – 01:00 PM

I have worked within the I.T industry for more than 15 years in various capacities (Data Analyst, Senior Programmer, Technical Analyst) I'm offering my expert level Excel and VBA Macro coding skills for any adhoc/custom project work. As well as Google sheets development(including app scripts writing) Anything from developing a Macro, to a full fledged macro enabled spreadsheet that can be used to assist in automating and removing human error from mundane day to day tasks such as data extraction and validation and even webscraping solutions. If Excel is able to perform the task/solution you require, then it is more than likely that I'm capable of delivering it for you. I've always worked in fast paced industries (pharmaceuticals, retail etc) so am no stranger to the importance of meeting a tight deadline, and will ensure to deliver as required.

With over 8 years of professional software development experience, I specialize in delivering high-impact custom applications and seamless ERP integrations that drive real business results. My core expertise includes: 🔹 Custom Software Development Built over 15+ custom web applications using .NET Core, Angular, and SQL Server Created & consulted on MVPs for 3 startups, accelerating time-to-market by 40% Modernized legacy Webforms systems to .NET Core + Angular, improving performance by 60% 🔹 SAP Business One Integrations & Consultation Completed 12+ SAP B1 Integrations across industries (Retail, Manufacturing, Wholesale) Developed 3 SAP Add-ons for inventory management, reporting automation, and finance sync Integrated SAP B1 with platforms like Shopify, Amazon, eBay, Retail Pro, Salesforce, and custom CRMs /ERP's Delivered SAP-integrated POS Inventory Systems syncing over 10,000 daily transactions Launched SAP API Gateway used for different web portals & handling the integration between SAP Business One & Retail pro, used in 100+ branches Retail Store. Key Achievements: Enabled businesses to achieve up to 30% faster operational workflows with SAP automations Helped clients scale revenues by 20%-50% through integrated, real-time systems Managed seamless API integrations processing 50K+ records daily without downtime Whether you need a robust SaaS application, a custom ERP extension, or API integrations that scale with your business, I can deliver solutions built for reliability, scalability, and future growth. 📩 Let's connect to discuss how we can bring your project to life.

Seasoned Cloud Specialist with over 4 years of expertise in architecting, deploying, and optimizing secure, scalable, and cost-efficient cloud infrastructures across Azure and Google Cloud. Adept at driving digital transformation through advanced cloud architecture, automation, CI/CD pipelines, containerization, and data engineering delivering solutions that enhance performance, reliability, and operational efficiency for businesses of all sizes. 🌟 Core Expertise ☁️ Azure Cloud Solutions VMs, Functions, Web Apps, Containers, Data Factory, Synapse, DevOps designing high-availability and cost-optimized architectures. 🌐 Google Cloud Platform Compute Engine, GKE, App Engine, Big Query, Cloud Functions, Cloud Storage delivering tailored, scalable, and secure cloud solutions. 🔄 Automation & DevOps Terraform, Ansible, Jenkins, Azure DevOps, GitLab CI/CD streamlining deployments and accelerating time-to-market. 🐳 Containers & Orchestration Docker, Kubernetes (GKE), Azure Container Services efficient orchestration, scaling, and lifecycle management of containerized workloads. 📊 Data & Analytics Data pipelines, Power BI, Big Query, Synapse, Databricks enabling real-time insights and actionable business intelligence. 🔧 Monitoring & Security Azure Monitor, GCP Operations Suite, Prometheus, Grafana; IAM, cloud security best practices, disaster recovery, and compliance ensuring secure, reliable, and highly available infrastructures. 🏆 Key Achievements 💎 Enterprise Cloud Solutions: Designed and implemented high-performance, scalable cloud architectures for multiple clients. 💰 Cost Optimization: Executed strategies achieving 20–40% savings on cloud spend through resource optimization and smart scaling. 🔄 Cloud Migrations: Led end-to-end migrations to Azure and GCP with minimal operational disruption. ⚡ CI/CD Automation: Built automated pipelines that improved deployment frequency, reduced errors, and accelerated delivery. ✅ Dedicated to delivering high-performing, secure, and tailored cloud solutions that align with business goals and drive sustainable growth.

I am a skilled Software Engineer and database developer with over 5 years of experience in designing, developing, and implementing databases using SQL, SSIS, SSRS, DBA, and Python Database Scripting and API development. My expertise in database development and management has enabled me to successfully create efficient and reliable databases that support complex business requirements.