We're looking for a Senior Full-Stack Developer with a strong backend focus to lead one of the most impactful transitions in our company's history: consolidating 15 Shopify stores into a unified, scalable, appfirst architecture. This isn't a maintenance role. You'll shape technical direction, work directly with product and business, and have real ownership from day one. What You'll Work O
- Design and build scalable backend systems on AWS • Centralize user authentication and order management across multiple Shopify stores • Integrate legacy systems into a unified app-based architecture • Contribute to the Breeze mobile app ecosystem
- Lead key initiatives including: o Multi-store order management consolidation o AI chatbot integration (SuperChat) o Dynamic bundle builder for multi-destination travel • Leverage AI tools daily to accelerate development and problemsolving
- Collaborate cross-functionally with product, marketing, and partner teams Tech Stack
- Cloud: AWS • eCommerce: Shopify (multi-store)
- Data & Marketing: PostHog, Klaviyo • AI Tools: GitHub Copilot, Claude, Lovable
- APIs: eSIM Go API and third-party integrations Engineering Culture We're AI-first by default, not as a buzzword, but as a daily practice. GitHub Copilot and Claude are part of our standard workflow. We move fast, ship continuously, and trust our engineers to make decisions.
Requirements
What We're Looking For • 5+ years of full-stack development experience
- Strong backend expertise (~70% backend / 30% frontend split)
- Proven ability to thrive in startup or high-growth environments
- Solid understanding of scalable architectures and API design
- Hands-on experience with AI-powered development tools
- eCommerce or Shopify experience is a strong plus
- Independent, ownership-driven mindset — you don't wait to be told what to do Soft Skills That Matter!
- Comfortable navigating ambiguity and fast-changing priorities
- Strong communicator across technical and non-technical teams
- Collaborative, low-ego, high-impact Why Join Now • Targeting 40–50% business growth this year
- Transitioning from acquisition-only to retention-driven growth • Moving from website-first to app-first within 6 months
- Small team → direct impact on product and technical direction
- Work with cutting-edge AI tools as a core part of your workflow Benefits & Perks:
- Full-time permanent role, based remotely
• Competitive salary (40-50K)
• Fast-growing international company
• Work with top talent across the globe
- Direct influence on product features and user experience
- Ownership, autonomy, and professional growth • A great, supportive team to work with
- The possibility to develop an innovative product in a new market within an international context
• Private health insurance
• 500 euros trainee budget
- English/Spanish classes • Very cool projects with the latest and high-end technology
• International experience
- A comfortable office based in the city center of Valencia, next to the metro stop
• Full remote work
- Nice social environment with a game room, joint lunches, drinks, and regular parties
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