Full-Stack Developer; Mid–Senior

PT Rancang Nusantara Teknologi is a digital product company based in Batam, Indonesia. Through Rancang Teknologi, we build websites, web apps, and custom software for businesses, with a focus on quality, performance, and scalability, and we also build and own our digital products. See our projects at

We're hiring a Mid–Senior Full-Stack Developer who is strong in Type Script and comfortable across backend and frontend. You'll design scalable systems, build APIs, and ship high-quality web interfaces for our products.

React, Next.js, Astro, Type Script (Flutter is a plus)

Claude Code or similar

Git, CI/CD, automated testing, cloud deployment

• Build and maintain web apps with Next.js, React, and Type Script.
• Develop frontend interfaces using React or Astro (Flutter is a plus) for internal and external apps.
• Develop backend services, REST APIs, databases, and third-party integrations.
• Design scalable architecture, database structures, and queries, and contribute to technical decisions.
• Ship features end-to-end (database, API, frontend, deployment) with product, design, and engineering.
• Use Claude Code or similar AI tools to build, debug, refactor, test, and explore codebases, and review AI-generated code for quality, performance, and security.
• Write clean, well-tested code, implement automated tests, and take part in code reviews.
• Troubleshoot issues and optimize application performance.

• Strong background in backend development and architecture, including design patterns, REST APIs, and third-party integrations.
• Hands-on experience with Node.js, Next.js, and modern frontend frameworks (React, Astro).
• Solid relational database and SQL skills, including data modeling and query optimization.
• Familiarity with version control (Git), CI/CD workflows, cloud platforms, and production deployment.
• Good grasp of clean code, testing, debugging, security, and performance.
• Practical experience with AI coding tools and the judgment to validate their output.
• Able to work independently while thriving in a small, collaborative team, with strong communication skills.

• Experienced in using AI coding tools like Claude Code or similar
• Experience with Supabase, including RLS and RBAC
• Experience building mobile apps with Flutter
• Understanding of performance optimization and app monitoring
• Experience in a startup or fast-paced team
• Proficiency in Mandarin (conversational or professional working proficiency)