Lead/Senior AI FullStack Software Engineer

Nix

Ukraine (Europe, Ukraine) Remote permanent

Posted: March 23, 2026

Required Skills

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.

Responsibilities:

• 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 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.

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

*not applicable for freelancers

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