Senior Backend Developer / Tech Lead (Russian and English speaker)

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