AI-First Full Stack Developer
Budget: $15.0 - $35.0
HOURLY / FULL_TIME
⭐ 5.00 (2)
Spain
javascript, node.js, react-js, api, mongodb, java, css
We are looking for an experienced **AI-First Solution Architect / Lead Full-Stack Engineer** to help design and build a scalable, secure, and production-ready SaaS platform.
The ideal candidate should not only be a strong developer but also a strategic technical partner who can guide architecture decisions, recommend the right tech stack, and ensure the product is built for long-term performance, maintainability, and growth.
You will be responsible for translating business requirements into a clean technical architecture, building high-quality frontend and backend systems, and setting up the foundation for a scalable SaaS product.
**Responsibilities:**
- Design a scalable and maintainable SaaS architecture from the ground up
- Build responsive, high-performance frontend interfaces using React.js / Next.js
- Develop secure and efficient backend APIs using Node.js / Express
- Work with TypeScript across the stack for reliability and clean development
- Design database schemas, API structures, caching strategies, and data flows
- Optimize application performance, Core Web Vitals, and overall user experience
- Set up clean code structure, CI/CD workflows, and deployment-ready architecture
- Help us choose the right tools, databases, hosting, and infrastructure patterns
- Refactor or improve existing systems where needed
- Provide technical guidance on scalability, security, and long-term product growth
**Required Skills:**
- Strong experience with React.js, Next.js, TypeScript, Node.js, and Express
- Experience building SaaS platforms, dashboards, admin panels, or complex web apps
- Solid understanding of frontend architecture, SSR, SSG, routing, and state management
- Experience with REST APIs and/or GraphQL
- Strong knowledge of database design, API optimization, and scalable backend systems
- Ability to write clean, modular, maintainable code
- Experience with cloud deployment, CI/CD, and performance optimization
- Good understanding of security, scalability, and production-level development
**Nice to Have:**
- Experience with AI-first products or AI integrations
- Experience modernizing legacy applications or monolithic systems
- Experience with high-traffic platforms, multi-tenant SaaS, or enterprise-grade systems
- Strong UI/UX sense and ability to build polished, premium user experiences
**Who We're Looking For:**
We need someone who can think beyond just writing code. You should be able to understand the business goals, suggest better technical approaches, identify risks early, and help us build a product that is stable, scalable, and built to last.
This role is best suited for someone with strong architectural thinking, full-stack execution ability, and experience delivering production-ready SaaS applications.
**To Apply:**
Please share:
1. Examples of SaaS or complex web applications you have built
2. Your experience with React, Next.js, TypeScript, Node.js, and cloud deployment
3. How you usually approach architecture planning for a new product
4. Any experience you have with AI integrations or scalable SaaS systems
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⚠️ **IMPORTANT NOTE — Please Read Before Applying:**
Proposals submitted **without a portfolio** will be **automatically rejected**. We receive a high volume of applications and only review candidates who can demonstrate real, production-level work.
Please make sure your proposal includes:
- **Live links** to projects you have built
- **GitHub profile** or code samples
- **App Store / Play Store links** if applicable
We are looking for a long-term technical partner who can help us build a reliable, high-performing product from concept to production. Only serious applicants with proven work should apply.
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