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Top Rated Plus freelancer with 17+ years of experience building backend systems, APIs, and internal tools for startups and enterprises worldwide. I specialize in PHP/Symfony backend development, third-party API integrations, and no-code/low-code platforms — plus growing expertise integrating OpenAI and chatbot technology into client workflows. Core expertise: -- Backend & APIs: PHP, Symfony, CodeIgniter, REST API design & documentation (Swagger) -- No-Code/Low-Code: Bubble(Certified), Retool, Xano, Airtable (Certified) -- Databases: MySQL, PostgreSQL, Firebase, Parse, Supabase -- Integrations: Twilio, Salesforce, Xero, OpenAI API, payment gateways, Google Dialogflow Directory Platforms: Brilliant Directories, eDirectory Recent impact: -- Built and maintain a large-scale classified platform — backend, data-scraping APIs, and --performance optimization -- Delivered backend systems for a cleaning-services platform processing billions of records across web, iOS, and Android -- Integrated OpenAI into a Bubble application for automated evaluation and structured feedback generation -- Built a Dialogflow-based chatbot for a food delivery platform -- Completed multiple Retool internal tool projects integrating APIs and databases to streamline client workflows Whether you need a robust backend, a fast no-code MVP, a legacy system modernized, or AI capabilities integrated into your existing product, I deliver reliable, production-ready work — fast. Let's talk about your project.

I am an experienced frontend web developer. I know all the modern frontend frameworks but my special strength is Vue (especially Vue3 and composition API). I have developed everything from websites to PWAs to Electron apps. As for backend, I have experience working with frameworks like flask, express, and laravel (as well as DIY frameworks to explore how one really works). I have built APIs for modern web apps. I have a good amount of knowlege of firebase and firestore. While I am not a CS graduate, I have been coding for almost 6 years now. My programming skills are very highly regarded among my peers. I am a very intelligent problem solver since I have a history in research based programming where I have worked with cutting edge problems and have created solutions that are fast, standard, efficient, and well laid out instead of spaghetti scientific code that just somehow works. I have experience in working with a lot of different languages for different projects - both hobby and professional ones. I have used everything from dynamic languages like JS, Python, and PHP to strongly typed languages like C and C# with obscure languages like Haskell and Prolog in between. I've also worked with embedded devices and languages like Arduino and MicroPython. The knowledge from these different paradigms of programming has enriched my knowledge in this field and sets me apart from other programmers. I am a solid programmer. I write industry standard code. I work well with teams. Alongside my work, I work on my hobby projects, and watch F1.

Are you looking for a reliable developer with specialized experience in FLEXCUBE, Core Banking Systems, Oracle PL/SQL, Java, and enterprise application development? I help banks, financial technology companies, and enterprise software teams develop, customize, maintain, integrate, and troubleshoot complex banking and business applications. My primary specialization is FLEXCUBE and Core Banking System development, supported by strong experience in Oracle technologies, PL/SQL, SQL, Java, C#/.NET, and .NET Core. ## WHAT I CAN HELP YOU WITH • FLEXCUBE development and customization • Core Banking System (CBS) enhancement and support • Oracle PL/SQL development • SQL query development and optimization • Stored procedures, functions, packages, and database programming • Java application development • C#/.NET and .NET Core development • REST API and system integration • Enterprise application enhancement and maintenance • Production issue investigation and bug fixing • Database troubleshooting and performance improvement • Database replication and data integration from MySQL, Java-based applications, and PostgreSQL to SQL Server • AWS and cloud-related application support ## WHY CLIENTS CAN WORK WITH ME WITH CONFIDENCE I understand that enterprise and banking applications require more than writing code. They require careful analysis, attention to data integrity, reliable integration, maintainable solutions, and a strong understanding of business processes. My approach is simple: 1. Understand the business and technical requirements. 2. Analyze the existing system and identify the root cause or best solution. 3. Develop clean, reliable, and maintainable code. 4. Test carefully and communicate progress clearly. 5. Deliver a solution that can be supported and maintained over time. ## MY TECHNICAL EXPERTISE ### Core Banking FLEXCUBE | Core Banking Systems | Banking Application Support | System Integration ### Database Development & Replication Oracle Database | PL/SQL | SQL | SQL Server | MySQL | PostgreSQL | Stored Procedures | Functions | Packages | Query Optimization | Database Replication | Data Migration | Data Integration ### Backend Development Java | C# | .NET | .NET Core | REST APIs | Enterprise Applications ### Cloud and Integration AWS | Application Integration | API Integration | Database Integration If you need a developer who can work with complex enterprise technologies, business-critical banking systems, database replication, and data integration across MySQL, PostgreSQL, Java-based applications, and SQL Server, I would be happy to discuss your project. Send me an invitation or message, and let's discuss how I can help with your FLEXCUBE, Core Banking, Oracle PL/SQL, database replication, Java, .NET, or enterprise application project. Let's work together to build a reliable solution for your business.

⭐ 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 ⭐ 𝗪𝗵𝗮𝘁𝘀𝗔𝗽𝗽 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝗘𝘅𝗽𝗲𝗿𝘁 ⭐ 46+ 𝗖𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀 I design and develop end-to-end 𝗪𝗵𝗮𝘁𝘀𝗔𝗽𝗽 𝗮𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 solutions powered by 𝗪𝗵𝗮𝘁𝘀𝗔𝗽𝗽 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗔𝗣𝗜 (Meta Cloud API) — including Meta verification, 𝗰𝗵𝗮𝘁𝗯𝗼𝘁 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁, bulk messaging systems, 𝗖𝗥𝗠 𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀, and custom marketing platforms. Here’s how I can support your business: 💼 𝗘𝗻𝗱-𝘁𝗼-𝗘𝗻𝗱 𝗪𝗵𝗮𝘁𝘀𝗔𝗽𝗽 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀 • WhatsApp Business API Setup & Configuration • Meta Business Verification & WhatsApp Account Approval • WhatsApp API Consultation & Onboarding Support • WhatsApp Broadcast Messaging & Bulk Campaign Setup • WhatsApp Business Account Setup & Troubleshooting • Custom WhatsApp Marketing Software Development (Like WATI / Interakt) • AI Chatbot Development for WhatsApp • Automated Lead Capture & Follow-up Workflows • WhatsApp CRM Integration (HubSpot, Zoho, Custom CRM, etc.) • WhatsApp Flow Development & Interactive Messaging • **Make** + WhatsApp Automation Integration • WhatsApp Lead Management (Auto-save to Google Sheets / Email Notifications) • WhatsApp Business API Setup & Configuration with 𝗠𝗮𝗻𝘆𝗰𝗵𝗮𝘁 and create AI/manual chatbot flow 🛠️ 𝗖𝘂𝘀𝘁𝗼𝗺 𝗪𝗲𝗯 & 𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀: • 𝗘𝗻𝗱-𝘁𝗼-𝗘𝗻𝗱 𝗣𝗿𝗼𝗱𝘂𝗰𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 – Figma → React/Next.js, Node.js + SQL/NoSQL, AWS/Digital Ocean, payments, real-time features, automations • 𝗔𝗣𝗜 𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 – Meta Cloud API, HubSpot, Google (Sheets, Maps, SSO), AI (OpenAI GPT-4/5) • 𝗔𝘂𝘁𝗵 & 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 – Google/Facebook SSO, JWT, OTP, QR • 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 – Agenda job scheduling, SendGrid emails • 𝗥𝗲𝗮𝗹-𝗧𝗶𝗺𝗲 𝗙𝗲𝗮𝘁𝘂𝗿𝗲𝘀 – WebSockets, Firebase, Twilio • 𝗣𝗿𝗼𝗱𝘂𝗰𝘁 𝗠𝗮𝗶𝗻𝘁𝗲𝗻𝗮𝗻𝗰𝗲 – Bug fixes & performance upgrades 🛠️ 𝗦𝗸𝗶𝗹𝗹𝘀 & 𝗧𝗲𝗰𝗵 𝗙𝗿𝗼𝗻𝘁-𝗘𝗻𝗱: React, Next.js, TypeScript, JavaScript (ES6+) 𝗨𝗜: Tailwind, Material UI, Framer Motion, shadcn 𝗕𝗮𝗰𝗸-𝗘𝗻𝗱: Node.js, Express.js (REST & GraphQL), Prisma, Sequelize 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲: PostgreSQL, MySQL, MongoDB, Redis 𝗠𝗼𝗯𝗶𝗹𝗲: React Native (Expo & CLI) 𝗖𝗹𝗼𝘂𝗱: AWS (EC2, S3, RDS, Lambda), Digital Ocean, CI/CD 𝗧𝗼𝗼𝗹𝘀: Git, Jira, Slack, Trello, Notion, ClickUp 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: Mocha, unit/e2e/integration automation 𝗗𝗼𝗺𝗮𝗶𝗻𝘀: E-commerce, ERP, Healthcare, Ride-sharing, Ticketing, CRM 🤝 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲 ✔ “Nadia has a strong can-do attitude and understands business logic, not only code. Highly recommend!” ✔"Nadia provides exceptional service. She combines clear technical guidance with rapid response times, ensuring a successful, error-free delivery every time." 🎯 𝗟𝗲𝘁’𝘀 𝗯𝘂𝗶𝗹𝗱 𝘆𝗼𝘂𝗿 𝗻𝗲𝘅𝘁 𝗺𝗶𝗹𝗲𝘀𝘁𝗼𝗻𝗲. 𝗕𝗼𝗼𝗸 𝗮 𝗳𝗿𝗲𝗲 𝟯𝟬-𝗺𝗶𝗻𝘂𝘁𝗲 𝗰𝗮𝗹𝗹. 🔑 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀 Meta Cloud API, Marketing Automation, , MVP Development, API Integration, Make, n8n, API, WhatsApp Bot Developer, Automation Developer, integration, WhatsApp Business API, WhatsApp Automation, WhatsApp Chatbot

💻 Full-Stack Software Engineer | Server-Side Specialist | Golang Expert ✅ I’m a Full-Stack Software Engineer with a strong focus on server-side development and a proven ability to adapt rapidly to emerging technologies. With several years of hands-on experience, I’ve built, scaled, and maintained high-performance systems for data-intensive and real-time applications. My deep expertise in Golang and distributed systems allows me to architect reliable, scalable solutions across various industries. 🧠 Key Expertise ✅ 𝗚𝗼𝗹𝗮𝗻𝗴 𝗘𝘅𝗽𝗲𝗿𝘁 – Skilled in building scalable backend services, microservices, APIs, and distributed systems. ✅ 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬 – Gorilla Mux, FastHTTP, Gin, Fiber (Go). ✅ 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐂𝐈/𝐂𝐃 – Docker, Kubernetes, Jenkins, GitHub Actions, GitLab Pipelines, ArgoCD, Tekton, Terraform. ✅ 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬 – PostgreSQL, MySQL, MongoDB, ScyllaDB, Apache Cassandra, TiDB. ✅ 𝐒𝐭𝐫𝐞𝐚𝐦𝐢𝐧𝐠 & 𝐑𝐞𝐚𝐥-𝐓𝐢𝐦𝐞 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 – Kafka, Redis, WebSocket, Socket.IO, WebRTC. ✅ 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 – SvelteKit, Svelte.js, Tailwind CSS with TypeScript. ✅ 𝐏𝐫𝐨𝐭𝐨𝐜𝐨𝐥𝐬 – gRPC, Protocol Buffers. ✅ 𝐂𝐥𝐨𝐮𝐝 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 – GCP, AWS (S3, CloudFront), NGINX, Bash, PowerShell. 🔧 What I’ve Built ✅ 𝐃𝐚𝐭𝐚 𝐏𝐢𝐩𝐞𝐥𝐢𝐧𝐞 𝐟𝐨𝐫 𝐌𝐋 – Engineered complex data processing software in Go to collect and process data for ML models. Set up robust CI/CD workflows on GCP. ✅ 𝐈𝐧𝐭𝐞𝐫𝐧𝐚𝐥 𝐖𝐞𝐛 𝐂𝐫𝐚𝐰𝐥𝐢𝐧𝐠 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 – Designed and maintained scalable web crawlers scraping 100+ sites, with mechanisms to bypass anti-bot protections. ✅ 𝐕𝐢𝐝𝐈𝐧𝐟𝐫𝐚 – A high-performance video streaming platform similar to Vimeo and VdoCipher. Built using Golang, FFmpeg, and S3 with HLS/DASH support. Designed for scale with Redis, TiDB, and auto-scaled Linux deployments. ✅ 𝐌𝐮𝐥𝐭𝐢-𝐂𝐃𝐍 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 – Architected and deployed a distributed multi-CDN network handling terabytes of global traffic for redundancy and low-latency content delivery. ✅ 𝐑𝐞𝐚𝐥-𝐓𝐢𝐦𝐞 𝐅𝐚𝐜𝐢𝐚𝐥 𝐑𝐞𝐜𝐨𝐠𝐧𝐢𝐭𝐢𝐨𝐧 𝐒𝐲𝐬𝐭𝐞𝐦 – Developed for university attendance systems using YOLOv8, ByteTrack, TensorFlow, and integrated with SvelteKit and Golang. ✅ 𝐥𝐢𝐭.𝐢𝐭 (𝐖𝐞𝐛𝟑 𝐒𝐨𝐜𝐢𝐚𝐥 𝐌𝐞𝐝𝐢𝐚) – Built complex features and maintained backend infrastructure with 100% reliability in a high-stakes environment. 🚀 Strengths ✅ 𝘿𝙚𝙚𝙥 𝙚𝙭𝙥𝙚𝙧𝙩𝙞𝙨𝙚 𝙞𝙣 𝙗𝙖𝙘𝙠𝙚𝙣𝙙 𝙖𝙧𝙘𝙝𝙞𝙩𝙚𝙘𝙩𝙪𝙧𝙚 𝙖𝙣𝙙 𝙙𝙞𝙨𝙩𝙧𝙞𝙗𝙪𝙩𝙚𝙙 𝙨𝙮𝙨𝙩𝙚𝙢𝙨 ✅𝙌𝙪𝙞𝙘𝙠 𝙖𝙙𝙖𝙥𝙩𝙖𝙗𝙞𝙡𝙞𝙩𝙮 𝙩𝙤 𝙛𝙖𝙨𝙩-𝙘𝙝𝙖𝙣𝙜𝙞𝙣𝙜 𝙩𝙚𝙘𝙝𝙣𝙤𝙡𝙤𝙜𝙞𝙚𝙨 𝙖𝙣𝙙 𝙨𝙩𝙖𝙘𝙠𝙨 ✅𝙎𝙩𝙧𝙤𝙣𝙜 𝙨𝙠𝙞𝙡𝙡𝙨 𝙞𝙣 𝙞𝙣𝙛𝙧𝙖𝙨𝙩𝙧𝙪𝙘𝙩𝙪𝙧𝙚 𝙖𝙪𝙩𝙤𝙢𝙖𝙩𝙞𝙤𝙣, 𝙧𝙚𝙖𝙡-𝙩𝙞𝙢𝙚 𝙨𝙮𝙨𝙩𝙚𝙢𝙨, 𝙖𝙣𝙙 𝙥𝙚𝙧𝙛𝙤𝙧𝙢𝙖𝙣𝙘𝙚 𝙤𝙥𝙩𝙞𝙢𝙞𝙯𝙖𝙩𝙞𝙤𝙣 ✅𝙋𝙧𝙤𝙫𝙚𝙣 𝙖𝙗𝙞𝙡𝙞𝙩𝙮 𝙩𝙤 𝙙𝙚𝙡𝙞𝙫𝙚𝙧 𝙥𝙧𝙤𝙙𝙪𝙘𝙩𝙞𝙤𝙣-𝙜𝙧𝙖𝙙𝙚 𝙨𝙤𝙛𝙩𝙬𝙖𝙧𝙚 𝙖𝙩 𝙨𝙘𝙖𝙡𝙚 🔗 GitHub: github.com/skshahriarahmedraka

I build modern, scalable web and mobile applications that help businesses grow and make users happy. I’ve worked across the full development cycle — from turning rough ideas into prototypes, to deploying complete, production-ready apps. Over the years, I’ve built everything from custom web dashboards and APIs to cross-platform mobile apps that look great and perform smoothly on both Android and iOS. 💡 What I’m good at 👉Frontend: React, Next.js, Vue.js, Angular 👉Backend: Node.js, Express, Django, Nest.js, FastAPI 👉Mobile: Flutter, React Native 👉Databases: MongoDB, PostgreSQL, MySQL, Firebase, Supabase 👉Cloud: AWS, Azure, Docker, CI/CD setups ⚙️ How I work I care about clean, maintainable code and clear communication. You’ll always know where your project stands — I give regular updates, meet deadlines, and focus on delivering exactly what you need. If you’re looking for someone who can handle both web and mobile development and truly cares about building great software, let’s talk. I’d love to hear more about your project and how I can help bring it to life.