Lead/Senior AI FullStack Software Engineer

Nix

Europe; Ukraine (Europe, Ukraine) Remote permanent

Posted: April 16, 2026

Quick Summary

As a Lead/Senior AI FullStack Software Engineer at iNIX, you will design and develop innovative AI-powered solutions for the European online car market, working with a talented team of engineers and industry experts. Key responsibilities include leading cross-functional teams, collaborating with cross-functional teams to drive business growth, and collaborating with customers to deliver high-quality solutions. You will also be responsible for mentoring junior engineers and contributing to the development of new technologies.

Job Description

N-iX is a global software development company founded in 2002, connecting over 2,400+ tech professionals across 40+ countries. We deliver innovative technology solutions in cloud computing, data analytics, AI, embedded software, IoT, and more to global industry leaders and Fortune 500 companies. Join us to create technology that drives real change for businesses and people across the world.

Our customer is the European online car market, with over 30 million monthly users and a presence in 18 countries. As an AI 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 frontend development (HTML, CSS, JavaScript) and component-based SSR frameworks like Next.js or React.

• Strong proficiency with backend development using Node.js / Java/ .Net orTypeScript.

• 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.

• 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.

• Strong 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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