Senior Backend Developer / Tech Lead (Russian and English …, Valencia

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. 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 Postúlate en Kit Empleo: kitempleo.es/empleo/6u0bh6