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N-iX Logo N-iX · IT - Software Development

Lead/Senior AI FullStack Software Engineer

Ukraine · Job Posted April 03, 2026
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Job Description

About the client: Our customer is the European online car market, with over 30 million monthly users and a presence in 18 countries. As a Lead FullStack Engineer, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers.

Job Responsibility

  • Continue the evolution and scaling of our freshly released, native ChatGPT apps and custom MCP integrations
  • Develop and maintain high-traffic, public-facing interfaces hosted on AWS modern cloud infrastructure
  • Work heavily with AI agents (Claude Code, ChatGPT/Codex) to maintain and extend a codebase
  • Operate with full team autonomy, collaborating closely with the Engineering Manager in a "co-author" environment
  • Follow the "you-build-it-you-own-it" philosophy, taking full responsibility for the SDLC and production readiness
  • Explore and implement emerging AI frameworks and technologies to keep the product at the forefront of the GenAI market

Requirements

  • 7+ years of experience developing reliable, highly available, and scalable software systems
  • Strong experience working with AI agents (Claude Code, ChatGPT/Codex) to maintain and extend a codebase
  • Strong proficiency with backend development using Node.js / Java/ .Net and TypeScript
  • Deep experience with Model Context Protocols (MCP)
  • Proven track record of using AI tooling (ChatGPT, Codex, Claude Code) for rapid operator-driven development
  • Hands-on experience with modern cloud infrastructures, specifically AWS, Terraform, and Docker
  • Strong proficiency with frontend development (HTML, CSS, JavaScript) and component-based SSR frameworks like Next.js or React
  • Experience with SQL and NoSQL datastores, as well as developing in service-based API environments
  • Strong understanding of software architecture, design patterns, and clean code principles
  • A modern, energetic mindset with critical thinking and systemic vision skills, the ability to work independently and take high-level ownership
  • Experience with formal CI/CD pipelines and monitoring services
  • Upper-intermediate English level

What we offer

  • Flexible working format - remote, office-based or flexible
  • A competitive salary and good compensation package
  • Personalized career growth
  • Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
  • Active tech communities with regular knowledge sharing
  • Education reimbursement
  • Memorable anniversary presents
  • Corporate events and team buildings
  • Other location-specific benefits
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