Senior Full-stack Engineer (.NET + React)

Nix

Ukraine (Europe, South America, Ukraine) Remote permanent

Posted: March 3, 2026

Required Skills

Job Description

We are looking for a Senior Full-Stack Engineer to join our team, Our customer is the European online car market with over 30 million monthly users, with a market 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:

• Design and develop full-stack cloud solutions from technical analysis to integration testing.

• Support existing systems

• Mentor junior engineers on design patterns, code reviews, testing practices, and scalable architecture.

• Establish documentation standards across teams.

• Conduct root cause analysis and collaborate with production support to resolve issues.

• Evaluate third-party software with business and engineering teams.

• Maintain CI/CD pipelines for applications.

Requirements:

• Canadian timezone work hours (EDT)

• 4+ years of experience with C# or .NET for web application development

• 4+ years of experience with React for web application development

• Experience with Azure, including migration from Azure to AWS

• Expert proficiency in GenAI-driven development, GitHub Copilot/Codex integration, rapid prototyping, automated refactoring, and AI-accelerated debugging

• Deep understanding of AI agents, autonomous task orchestration, reasoning engines, tool-use integration, and multi-step workflow automation

• Mastery of iterative prompting. Chain-of-Thought (CoT), Few-Shot prompting, output validation, and prompt optimization for production-grade code

• Familiarity with Kafka, SQL, and performance optimization

• Strong understanding of event-driven and microservices architecture

• Experience, Application Insights, and responsive front-end design using React

• Background in high-traffic websites, performance tuning, and security

• Ability to communicate technical solutions effectively

• Expertise in unit, component, and integration testing

• Experience with Azure DevOps, and JIRA in distributed teams

• Solid grasp of agile methodologies, including ScrumBan/Kanban and Gitflow

Nice to Have:

• Previous DevOps Experience is a great advantage

• Experience with Java and Scala

• Experience with observability tools like Datadog

• Proficiency with Java/Spring Boot for building APIs and web applications - nice to have

• Experience with AWS

• Previous experience with GitHub

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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