Firmansyah O.

I design and build software products end to end, from the first idea and user experience to frontend, backend, cloud infrastructure, and deployment. I'm a Top Rated Plus Full-Stack Developer and Product Engineer with 6 years of professional experience. I help founders and engineering teams build SaaS products, web applications, React Native mobile apps, desktop software, and AI-powered workflows. My core stack includes React, Next.js, TypeScript, JavaScript, Node.js, React Native, Expo, AWS, GraphQL, and Electron. WHAT I CAN HELP YOU BUILD Full-Stack Development & SaaS - Build SaaS platforms, MVPs, dashboards, marketplaces, and custom web applications - Develop React and Next.js applications with TypeScript - Implement backend APIs, authentication, role-based access, and complex business workflows - Take products from early requirements and UI design through deployment React Native & Mobile Development - Build iOS and Android applications with React Native and Expo - Develop features, navigation flows, state management, and API integrations - Modernize existing mobile apps, upgrade dependencies, and migrate JavaScript to TypeScript AWS, Backend & Cloud Architecture - Build serverless applications using AWS Amplify, Lambda, AppSync, Cognito, DynamoDB, and S3 - Develop GraphQL and REST API integrations - Design scalable, maintainable application architecture AI Applications, Agents & Automation - Integrate OpenAI APIs and AI capabilities into software products - Build agent workflows using OpenClaw and Model Context Protocol (MCP) - Implement tool-connected automation, multi-step execution, and human review checkpoints - Improve AI-assisted development workflows using tools such as Codex Desktop Applications - Develop desktop applications and productivity tools using Electron - Build interactive dashboards, local workflows, and application integrations SELECTED EXPERIENCE - Flowtive: Independently designed and developed an offline-capable project management application with Kanban boards, sprints, and workflow management. - Sukaq: Developed a creator storefront and digital product platform using Next.js, TypeScript, and AWS Amplify. - Cycles: Built an AI-assisted engineering workflow separating implementation and review responsibilities. - Healthcare applications: Worked on configurable medical questionnaires, hospital indoor navigation and routing, and JavaScript-to-TypeScript modernization. - Education software: Contributed to multi-role applications supporting teachers, students, and school administrators. - Atlas: Built a desktop photo gallery with privacy-focused features and interactive GPS mapping. HOW I WORK I enjoy taking ownership beyond individual tickets. That means understanding the product goals, making practical design and architecture decisions, implementing features, and keeping applications maintainable as they evolve. I've worked on new products as well as long-term production applications for international clients. I value clear communication, reliable engineering, and sensible technical choices. Whether you need a React developer, a React Native engineer, a full-stack development partner, or help bringing an AI-powered SaaS idea to life, let's discuss the most practical way to build it.