We're looking for a hands-on fractional CTO to lead the technical direction of Layerline (layerline.io), a global 3D printing marketplace. Layerline is the immediate focus, but on the backend we're also building our own custom e-commerce platform — and the role will expand to this and other ventures within our portfolio over time. This is someone who can code, architect, and implement — not just advise. Freelancers only — no agencies. Flexible, ongoing engagement with potential to grow into a full-term role and long-term technical partnership. --- ABOUT US • Multiple ventures — ecosystem infrastructure (B2B SaaS), e-commerce (3D printing marketplace), technology solutions, startup ecosystem coordination • Layerline (layerline.io) is the immediate focus — selling 3D printers, filament & accessories worldwide • We're building our own custom e-commerce platform on the backend (think: Shopify alternative) — a major future focus for this role • Based in the Netherlands with a US entity, operating globally • Distributed teams across developing countries (Egypt, India, and others) • Looking for a CTO who can grow with us across ventures --- WHAT WE NEED Hands-On Development (Immediate Priority — Layerline) • Building and improving features on our custom-built e-commerce platform (built with Lovable) • Custom development — apps, integrations, automations • Front-end and back-end development as needed • Rapid prototyping and shipping of new features • Vibe coding mindset — leveraging AI tools (Lovable, Cursor, Claude, etc.) to move fast Tech Architecture & Infrastructure • Audit current tech stack and recommend improvements • Scalable architecture decisions as the platform grows • Third-party integrations (payment, shipping, ERP, CRM, analytics) • Performance optimization — site speed, uptime, reliability • Security best practices and implementation AI & Automation • Identifying opportunities to automate operations with AI • Implementing AI-powered features (product recommendations, search, chatbots, dynamic pricing) • Building and deploying agentic AI solutions — autonomous workflows, AI agents, multi-step automation • Workflow automation — order processing, inventory, customer service • Staying ahead of AI/ML and agentic AI trends relevant to e-commerce Tech Strategy • Advise on long-term tech stack decisions • Build vs. buy decisions for new capabilities • Lead development of our custom e-commerce platform (Shopify alternative) • Technical due diligence for new ventures within the portfolio • Roadmap planning and prioritization • Future SaaS development opportunities within the broader ventures --- WHO WE'RE LOOKING FOR • 7+ years software development experience with at least 3 in a senior/lead role • Strong hands-on coding skills — you still write code, not just manage • Full-stack capabilities — comfortable across front-end, back-end, and infrastructure • Proven experience building and scaling e-commerce platforms • Strong understanding of AI/ML tools, agentic AI, and how to apply them practically • Experienced with vibe coding tools (Lovable, Cursor, Copilot, Claude, etc.) • Solid version control practices (Git, branching strategies, code review workflows) Bonus: • Experience with Shopify or other e-commerce platforms • Experience building SaaS/platform products from scratch • Familiarity with the 3D printing or maker/hardware space • Experience managing small dev teams or offshore developers • DevOps/cloud infrastructure experience (AWS, GCP, etc.) • Track record of shipping fast in startup environments --- HOW WE WORK • Remote, flexible hours • Clear communication, ownership mindset • Move fast, ship often, iterate • Long-term relationship with the right person --- TO APPLY 1. Your technical background and relevant experience 2. Examples of e-commerce platforms or products you've built (with links if possible) 3. Your experience with AI/automation and vibe coding tools 4. How you'd approach auditing and improving an existing e-commerce stack 5. Fee structure (hourly or retainer) 6. Availability and earliest start date