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I help established businesses maintain, extend, and stabilize web applications that are already in production without breaking what's working. Most clients who reach out to me are dealing with one of these situations: — A backend system that's grown complex and difficult to extend — An API integration that was done quickly and now needs to be done right — A platform that needs new features without disrupting live operations — A workflow that should be automated but nobody's had time to properly build it If any of these sound familiar, we're probably a good fit. WHAT I WORK ON: ▸ Laravel application development, maintenance & feature extensions ▸ Python backend services & workflow automation ▸ REST API development, third-party integrations & webhook systems ▸ Business systems — ERPs, CRMs, internal tools, admin dashboards ▸ Legacy codebase stabilization, refactoring & modernization ▸ Database architecture, query optimization & performance troubleshooting ▸ AI API integrations (OpenAI, Claude, automation pipelines) ▸ Long-term technical support for live, production platforms HOW I WORK: I treat your system the way it deserves to be treated carefully. Before touching anything, I understand how it's structured, what's already working, and what the business actually needs. I write code that the next engineer can read, not just code that runs today. I'm available for both fixed-scope projects and ongoing engineering support retainers. GOOD FIT IF YOU NEED: ✔ A senior engineer who can own backend systems independently ✔ Long-term collaboration — not a one-off contractor who disappears ✔ Someone who understands business context, not just technical specs ✔ Reliable support for a system that cannot afford downtime or regressions ✔ Technical consultation on architecture decisions, API strategy, or scaling TECH STACK: Laravel / PHP · Python · JavaScript / TypeScript · Vue.js · React REST APIs · MySQL · PostgreSQL · Docker · Linux · Git If your platform is already live and you need an engineer you can trust with it long-term — let's talk

Hi, my name is Reisyan Nathan Kusuma I’m a Software Engineer with 3+ years of experience specializing in modern web development using Next.js and React. I’ve worked on various production-grade projects, focusing on building fast, scalable, and user friendly interfaces Beyond the frontend, I also have solid experience with backend development using ASP.NET Core, Node.js, and Laravel, along with strong SQL skills for designing efficient and reliable databases I enjoy solving real world engineering problems, improving system performance, and delivering clean, maintainable code. I’m always open to learning new tools and frameworks that support high quality software development

Are you seeking a high-agency, senior software architect to bridge traditional enterprise backends, high-throughput IoT telemetries, and cutting-edge AI-driven agent workflows? With over 20 years of software engineering experience and dual credentials as a Google Cloud Professional Cloud Architect and Professional Data Engineer, I design, build, and orchestrate robust, production-ready systems that are resilient, automated, and highly secure. From developing custom Model Context Protocol (MCP) servers to deploying isolated, ephemeral Docker sandboxes on Azure, I help mid-market to enterprise companies automate manual workflows, slash cloud costs, and build custom AI-powered applications that drive massive business value. 🌟 CORE COMPETENCIES & SERVICES 1. Autonomous AI Agents & Custom MCP Integrations • Bespoke MCP Servers: Built Node.js MCP servers enabling LLMs to run natural-language queries and secure updates directly over clinical databases. • AI Agent Sandboxing: Launched Azure platforms orchestrating isolated, ephemeral Docker sandboxes running Claude Code and Cline to process tasks via MS Teams. • Long-Term Memory: Bridged sandboxes to Segnog memory (FalkorDB graph and local Gemma embeddings) via SSE proxies, reducing latency to under 0.3 seconds. 2. Multi-Cloud Architecture, DevOps & IaC • Multi-Cloud: Deep expertise in AWS, GCP, and Azure, optimizing resources and enforcing compliance. • IaC: 100% automated provisioning and drift management using Terraform and AWS CDK for reproducible environments. • Container & CI/CD: Deployments using Kubernetes (GKE), Istio, and pipelines (GitHub Actions, CircleCI, GitLab, Bitbucket). 3. High-Throughput Backends & IoT Telemetry • IoT Backend Scale: Engineered medical IoT backends processing 1,000+ sensor records per second into AWS Timestream with real-time analytics. • Microservices Design: Building robust, highly concurrent microservices in Golang and Python (Django, FastAPI), communicating via Kafka, RabbitMQ, or NATS. • Databases & Search: Advanced query optimization and spatial architecture using PostgreSQL (with PostGIS), Cloud SQL, ElasticSearch, and Firestore. 💼 FEATURED CLIENT SUCCESS STORIES 🚀 Serverless Medical SaaS & Teams-Integrated AI Agents • Architected serverless diagnostics billing, clinical faxing, and agreement SaaS. Built TypeScript MCP servers for secure clinical queries and NanoClaw/OpenClaw AI agent sandboxes on Azure running Claude Code to process complex coding tasks. 🚀 Django Backend & Spatial Infrastructure • Engineered a Django backend deployed on GCP Cloud Run. Implemented robust credential mounting using Google Cloud Secret Manager. Developed a custom Gmail OAuth2 authentication system for verified enterprise delivery, and built a high-availability infrastructure utilizing PostGIS, Cloud Tasks, and Cloud Scheduler. 🚀 GKE Microservices for Enterprise Loyalty • Developed scalable microservices for a high-volume loyalty system using Golang and Python, deployed on GKE (Google Kubernetes Engine) with CI/CD fully automated via Bitbucket Pipelines. 🛠️ MY TECHNICAL TOOLBOX • Languages: Golang, Python, TypeScript, JavaScript, Java, C++, C#, Swift, SQL • Clouds: AWS (EC2, Lambda, Timestream), GCP (Cloud Run, GKE, GCE), Azure, Cloudflare • DevOps: Terraform, AWS CDK, Docker, Kubernetes (GKE), GitHub Actions, CircleCI, GitLab, Bitbucket Pipelines, Jenkins • Databases & Queues: PostgreSQL (PostGIS), AWS Timestream, FalkorDB, ElasticSearch, SQLite, Cloud SQL, Firestore, Kafka, NATS, Pub/Sub • AI & LLMs: Model Context Protocol (MCP), Claude Code, OpenAI and Gemini APIs, local LLMs (Llama 2, Mistral), PyTorch • Frameworks: Django, Spring Boot, React, Next.js, Stripe, ExpressJS, NestJS, GraphQL, Web Speech API 🏆 EDUCATION & ACTIVE CERTIFICATIONS • Google Cloud Professional Cloud Architect (Active) • Google Cloud Professional Data Engineer (Active) • Proctored Upwork Skill Certification in Python Development (Top Tier) • M.S. in Electronic Engineering (Game Technology) – Institut Teknologi Bandung (ITB) • B.E. in Informatics Engineering (Distributed Systems) – Institut Teknologi Bandung (ITB) • HackerRank Certified SQL Advanced • Oracle Certified Associate (Java SE 5/SE 6) 🤝 WHY COLLABORATE WITH ME? • High-Agency: I take full ownership of your architecture, security, and cloud cost optimization. • AI Native: Proven experience building real-world MCP servers and secure, containerized AI agent sandboxes. • Security First: Leveraging Secret Managers, secure VPNs, and strict IAM to safeguard user and enterprise data. • Clean Code: Domain-driven design with robust test coverage (90%+ target). Let's discuss how we can scale your infrastructure, reduce your cloud spend, or build your next custom AI workflow. Click "Invite" or "Send Message" to schedule a brief discovery call.

Welcome! 👋 𝗛𝗶𝗴𝗵-𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗯𝗮𝗰𝗸𝗲𝗻𝗱𝘀 𝗮𝗿𝗲𝗻'𝘁 𝗷𝘂𝘀𝘁 𝗯𝘂𝗶𝗹𝘁; 𝘁𝗵𝗲𝘆 𝗮𝗿𝗲 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗲𝗱 𝗳𝗼𝗿 𝗿𝗲𝗹𝗶𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝗮𝗻𝗱 𝘀𝗽𝗲𝗲𝗱. With 3+ years of experience, I specialize in building scalable, secure, and data-driven backend systems. My expertise bridges the gap between 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗮𝗹 𝗜𝗼𝗧 (𝗠𝗼𝗱𝗯𝘂𝘀/𝗠𝗤𝗧𝗧/𝗦𝗡𝗠𝗣) and modern cloud architectures. Whether you need a real-time energy monitoring system or a secure API for a fast-growing startup, I deliver clean, production-ready code. 🚀 𝗧𝗵𝗲 𝗔𝗜-𝗘𝗻𝗵𝗮𝗻𝗰𝗲𝗱 𝗔𝗱𝘃𝗮𝗻𝘁𝗮𝗴𝗲 I leverage a modern, 𝗔𝗜-𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝘄𝗼𝗿𝗸𝗳𝗹𝗼𝘄 (𝗖𝗹𝗮𝘂𝗱𝗲, 𝗚𝗶𝘁𝗛𝘂𝗯 𝗖𝗼𝗽𝗶𝗹𝗼𝘁, 𝗔𝗻𝘁𝗶𝗴𝗿𝗮𝘃𝗶𝘁𝘆) to provide superior value to my clients: • 𝗙𝗮𝘀𝘁𝗲𝗿 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝘆: I can prototype and ship complex features 2x faster than traditional manual coding. • 𝗥𝗼𝗯𝘂𝘀𝘁 𝗤𝘂𝗮𝗹𝗶𝘁𝘆: Using AI for deep-dive debugging, automated unit testing, and code refactoring ensures fewer bugs and higher security. • 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗲𝗱 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲: I use AI as a high-level pair programmer to double-check performance bottlenecks and ensure industry-standard design patterns. 🛠 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 • 𝗛𝗶𝗴𝗵-𝗖𝗼𝗻𝗰𝘂𝗿𝗿𝗲𝗻𝗰𝘆 & 𝗦𝗽𝗲𝗲𝗱: Expert in building ultra-low latency APIs using 𝗧𝘆𝗽𝗲𝘀𝗰𝗿𝗶𝗽𝘁 (𝗙𝗮𝘀𝘁𝗶𝗳𝘆, 𝗘𝘅𝗽𝗿𝗲𝘀𝘀), 𝗣𝘆𝘁𝗵𝗼𝗻 (𝗙𝗮𝘀𝘁𝗔𝗣𝗜, 𝗙𝗹𝗮𝘀𝗸), and 𝗚𝗼𝗹𝗮𝗻𝗴 for high-performance microservices. • 𝗜𝗼𝗧 & 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗮𝗹 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: Strong background in 𝗠𝗤𝗧𝗧, 𝗠𝗼𝗱𝗯𝘂𝘀, 𝗮𝗻𝗱 𝗦𝗡𝗠𝗣. I’ve successfully built data-logging systems for solar panels and battery monitoring on 𝗥𝗮𝘀𝗽𝗯𝗲𝗿𝗿𝘆 𝗣𝗶 (𝗟𝗶𝗻𝘂𝘅) environments. • 𝗠𝗼𝗱𝗲𝗿𝗻 𝗔𝘂𝘁𝗵 & 𝗖𝗹𝗼𝘂𝗱: Proficient in 𝗦𝘂𝗽𝗮𝗯𝗮𝘀𝗲 (Auth & Storage) and custom 𝗝𝗪𝗧/𝗥𝗕𝗔𝗖 implementations to ensure your data is secure and access is granular. • 𝗦𝗰𝗮𝗹𝗮𝗯𝗹𝗲 𝗗𝗮𝘁𝗮 𝗣𝗶𝗽𝗲𝗹𝗶𝗻𝗲𝘀: Experience with 𝗥𝗮𝗯𝗯𝗶𝘁𝗠𝗤 + 𝗥𝗲𝗱𝗶𝘀 + 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝗦𝗤𝗟 for processing large-scale, real-time data streams and batch processing. • 𝗗𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁 & 𝗗𝗲𝘃𝗢𝗽𝘀: Hands-on experience with 𝗗𝗼𝗰𝗸𝗲𝗿, 𝗣𝗠𝟮, and 𝗦𝘆𝘀𝘁𝗲𝗺𝗱 to ensure 𝟵𝟵.𝟵% 𝘂𝗽𝘁𝗶𝗺𝗲 in production environments. 💼 𝗦𝗲𝗿𝘃𝗶𝗰𝗲 𝗕𝗿𝗲𝗮𝗸𝗱𝗼𝘄𝗻 • 𝗕𝗮𝗰𝗸𝗲𝗻𝗱: Node.js (Fastify, Express, Typescript), Python (FastAPI), Golang • 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱: React, NextJS • 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 & 𝗖𝗹𝗼𝘂𝗱: Supabase (Auth/Storage), PostgreSQL, MySQL, MongoDB, Redis • 𝗜𝗼𝗧 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: MQTT, Modbus, SNMP, Data Ingestion, Raspberry Pi, Zabbix • 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲: RabbitMQ, Real-time Data Pipelines, API Optimization • 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲: Docker, Linux Admin, Systemd, PM2, Shell Scripting "𝙄 𝙙𝙤𝙣'𝙩 𝙟𝙪𝙨𝙩 𝙬𝙧𝙞𝙩𝙚 𝙘𝙤𝙙𝙚; 𝙄 𝙗𝙪𝙞𝙡𝙙 𝙧𝙚𝙡𝙞𝙖𝙗𝙡𝙚 𝙨𝙮𝙨𝙩𝙚𝙢𝙨 𝙩𝙝𝙖𝙩 𝙚𝙢𝙥𝙤𝙬𝙚𝙧 𝙗𝙪𝙨𝙞𝙣𝙚𝙨𝙨𝙚𝙨 𝙩𝙤 𝙨𝙘𝙖𝙡𝙚. 𝙇𝙚𝙩’𝙨 𝙘𝙤𝙡𝙡𝙖𝙗𝙤𝙧𝙖𝙩𝙚 𝙖𝙣𝙙 𝙗𝙧𝙞𝙣𝙜 𝙮𝙤𝙪𝙧 𝙫𝙞𝙨𝙞𝙤𝙣 𝙩𝙤 𝙡𝙞𝙛𝙚 𝙬𝙞𝙩𝙝 𝙨𝙥𝙚𝙚𝙙 𝙖𝙣𝙙 𝙥𝙧𝙚𝙘𝙞𝙨𝙞𝙤𝙣." 🔑 Keywords: Backend Developer, RESTful API, Node.js, TypeScript, NestJS, Express.js, Python, Flask, FastAPI, Golang, Supabase, PostgreSQL, MySQL, MongoDB, Redis, RabbitMQ, MQTT, Docker, PM2, Systemd, IoT, Data Ingestion, RBAC, JWT, Scalable Systems.

👋 About Me I'm a passionate fullstack and mobile developer with 12 years of experience transforming ideas into powerful digital solutions. From startups to enterprise clients, I've helped businesses across the globe build web applications, mobile apps, and e-commerce platforms that drive real results. What sets me apart? I don't just write code, but I solve business problems. I combine technical expertise with strategic thinking to deliver solutions that are not only functional but also scalable, user-friendly, and profitable. 💻 My Technical Arsenal Frontend Development ✅ Languages: JavaScript (ES6+), TypeScript, HTML5, CSS3, SASS/SCSS ✅ Frameworks & Libraries: React.js, Next.js, Vue.js, Angular, jQuery ✅ Mobile: React Native, Flutter ✅ UI Libraries: Material-UI, Ant Design, Bootstrap, Tailwind CSS ✅ State Management: Redux, Context API, Vuex, NgRx Backend Development ✅ Languages: Node.js, Python, PHP, Java, C# ✅ Frameworks: Express.js, Django, Flask, Laravel, Spring Boot, .NET ✅ APIs: REST, GraphQL, WebSocket, gRPC ✅ Authentication: JWT, OAuth, Passport.js, Firebase Auth ✅ Real-time: Socket.io, WebRTC Database & Storage ✅ SQL: PostgreSQL, MySQL, SQLite, SQL Server ✅ NoSQL: MongoDB, Redis, DynamoDB, Firestore ✅ Cloud Storage: AWS S3, Google Cloud Storage, Azure Blob ✅ Database Design: Schema optimization, indexing, query optimization E-commerce & CMS ✅ Shopify: Theme development, App development, Shopify Plus ✅ WordPress: Custom themes, plugins, WooCommerce ✅ Other Platforms: Magento, PrestaShop, Drupal 🎯 My Specializations 🛒 Shopify Expert Certified Shopify Partner specializing in: ⬩ Custom theme development from scratch ⬩ Shopify app development (public & private) ⬩ Store optimization for higher conversions ⬩ Shopify Plus enterprise solutions ⬩ Third-party integrations and API development ⬩ Performance optimization and SEO 📱 Mobile App Development ⬩ Native and cross-platform mobile solutions: ⬩ iOS and Android native development ⬩ React Native cross-platform apps ⬩ Flutter mobile applications ⬩ Progressive Web Apps (PWAs) ⬩ App store optimization and deployment ⬩ Push notifications and real-time features 🌐 Web Application Development ⬩ Full-scale web applications and platforms: ⬩ Single Page Applications (SPAs) ⬩ Server-side rendering with Next.js ⬩ Real-time applications with WebSocket ⬩ API-first architecture ⬩ Microservices development ⬩ Enterprise-grade solutions ⚡ Performance Optimization Making your applications lightning-fast: ⬩ Core Web Vitals optimization ⬩ Database query optimization ⬩ Caching strategies implementation ⬩ CDN setup and optimization ⬩ Mobile performance tuning ⬩ SEO technical improvements

I’m a Full Stack Developer with 15+ years of professional experience delivering scalable and innovative web, mobile, and AI-powered solutions for clients across Indonesia, Singapore, and the U.S. I specialize in building robust full stack applications using modern frameworks such as React, Angular, Node.js, Spring Boot, Golang, and Django, combined with deep database expertise in PostgreSQL, MySQL, and MongoDB. Over the years, I’ve successfully developed and led projects for enterprise clients — from university management systems and POS applications, to AI-powered detection systems for healthcare and agriculture. My focus is always on creating clean, maintainable, and high-performance software. 🔧 Core Skills Frontend: React JS, Angular, Bootstrap, jQuery, TypeScript, HTML5, CSS3 Backend: Spring Boot (Java), Golang (Iris/Express), Node.js, Django, .NET Core Mobile: React Native, Flutter, Android (Java/Kotlin) AI & ML: YOLOv8, OpenCV, TensorFlow, Keras, Flask Database: PostgreSQL, MySQL, MongoDB, MSSQL, Oracle DevOps: Docker, Nginx, AWS, Heroku Other Tools: RabbitMQ, JasperReports, Supervisor, Git 🚀 Featured Projects University Microservices System — Migrated monolithic Laravel app to microservices using PHP (Silex), React JS, and RabbitMQ. AI-Powered Breast Cancer Detection — Combined Flask + Flutter + YOLOv8 for image-based early diagnosis. POS System (Spring Boot + Angular) — Built a full-featured retail solution with JWT Security and OpenAPI integration. TokoPOS (React Native + Node.js) — Developed a modern cross-platform POS with Clerk authentication and Drizzle ORM. E-Meterai Integration (SkillAcademy) — Engineered a high-traffic API integration for PERURI’s digital stamp service. 🧠 Certificates Angular & Node.js (Udemy, 2025) Sequence Models, CNNs, Improving Deep Neural Networks (Coursera, 2020) Android Mobile Applications (Coursera, 2014–2015)