Senior AI-Assisted Full Stack Developer - Septillion Co., Ltd

• Lead development and maintenance of the company's web platforms - the consumer e-commerce site (including a real-time 3D print pricing engine) and the B2B product catalogue and lead generation site.
• Work directly with the sales, accounting, warehouse and service teams to gather requirements, understand how the business actually operates, and turn manual processes into systems that reduce duplicated work.
• Design the system architecture, set the technical roadmap, and run code reviews for the team.
• Design and build AI agents for sales, customer service and internal operations - agent architecture, prompt engineering, tool and function calling, RAG and vector databases, evaluation and cost control.
• Extend and maintain internal systems, including the company ERP and our n8n automation workflows.
• Integrate third-party APIs: LLM providers, payment gateways, logistics carriers, LINE OA and Microsoft 365.
• Use AI coding tools (Claude Code, GitHub Copilot, Codex in VS Code) as a core part of your daily workflow to ship faster, while keeping full control over code quality and security.
• Own deployment, CI/CD, performance and security on our Linux VPS infrastructure.
• Liaise with overseas suppliers and partners on system integration and technical documentation.
• Mentor our mid-level developer and help grow the engineering team.

• Bachelor's degree in Computer Engineering, Computer Science, Information Technology or a related field - or a portfolio that clearly demonstrates equivalent ability.
• 4+ years of professional web application development experience.
• Strong grasp of business process - sales, procurement, inventory and after-sales service. You can analyse an operational problem, redesign the workflow, and explain it clearly to non-technical users.
• Professional working English - spoken, reading and written. You will run meetings and handle email correspondence with international partners on your own.
• Strong command of JavaScript / TypeScript, Node.js and React or Next.js.
• Comfortable with PostgreSQL or MySQL, Redis, Docker and Git.
• Experience deploying and operating applications on Linux VPS (nginx, PM2 or equivalent).
• Real, shipped experience building AI agents or LLM applications - you understand prompt engineering, tool calling, RAG, and where models fall short.
• You use AI coding assistants daily in production work and can explain how you work with them to produce high-quality output.
• A GitHub profile or portfolio we can review.
• Nice to have: e-commerce or real-time price calculation systems; a Business Analyst or Solution Architect background alongside development; Python and open-source ERP systems; n8n or comparable workflow automation tools; multi-agent systems, MCP (Model Context Protocol) or agent orchestration frameworks; understanding of 3D printing, CAD or 3D model file formats (STL, 3MF).

Septillion Co.,ltd - We'r one of leading in 3D Printing solutions in Thailand. We'r authorized reseller/distributor of world class leading 3D Printing solutions and 3D Scanning. We'r offering various technologies of 3D Printing from home-use desktop machine till high-end manufacturing machine.
We'r providing consultancy in Addictive manufacturing and offers 3D printing service.

You'r welcome to be part of our team in fast growing business of new technology in Manufacturing business.