Lead FullStack Software Engineer

Nix

South America (Europe, South America, Ukraine) Remote permanent

Posted: February 26, 2026

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 Senior 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:

• Developing fast, high-traffic public-facing websites

• Explore new technologies and help the team to use them

• Work using AI tools and apply them to the SDLC

• Following software development best practices while delivering the work

• Following testing principles while testing your own code to ensure production readiness

• Follow the philosophy of: you-build-it-you-run-it (be responsible for the SDLC processes)

Requirements:

• 5+ years developing reliable, highly available, and scalable software systems

• Strong understanding of software architecture and design patterns

• Firm grasp of clean code principles and coding standards

• Strong proficiency using AI tooling, such as ChatGPT/Codex, for rapid development

• Experience integrating AI tooling into your development environment for streamlined usage

• Experience with AI Frameworks like Vercel AI SDK, LangChain, etc.

• Strong proficiency with backend development (Typescript, Node.js, C#)

• Strong proficiency with SQL &amp; NoSQL datastores (GraphQL, Redis)

• Strong proficiency with frontend development (HTML, CSS, JavaScript)

• Strong proficiency with component-based frameworks and SSR (Next.js/React, Vue.js, Angular)

• Hands-on experience developing and maintaining 3rd party content management systems

• Knowledge of modern cloud infrastructures and tools, such as AWS, Terraform, and Docker

• Experience with APIs and developing in a service-based application environment

• Experience building optimized UIs for performance

• Proficiency with version control systems such as Git

• Experience working within a formal CI/CD pipeline

• Experience with logging, monitoring, and alerting services like Datadog, Newrelic

• Solid approach to testing and ensuring quality of code, Unit testing, backend, and frontend

• At least Upper-intermediate English level

• Working for the North America timezone (ET) is preferable (till 21:00 Kyiv time)

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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