Node.js/AI engineer

About the role and client:
We’re looking for a talented and detail-oriented Node.js/AI engineer with strong experience in AI and Node development. You'll work with the product team to build AI assisted solutions.

Responsibilities:
- Integrate AI services (LLMs - classification systems, zero-shot, text generation, etc) into new and existing application architectures
- Adjust, refine, and version AI prompts and workflows to improve accuracy, reliability, and real-world performance in production systems
- Collaborate with designers, peers, and management to deliver consistent user flows and experiences
- Thoroughly test and debug code, participate in code reviews, provide documentation, and ensure systems meet quality standards

Requirements:
- At least 5+ years of experience as a full-stack engineer/Back-end engineer;
- Hands-on experience integrating AI or ML services into applications, including prompt design and iteration for LLM-based systems;
- A thorough understanding of how model parameters change output;
- Experience integrating third party APIs;
- Strong proficiency with Node.js, Express, etc and building RESTful and event-driven backend services;
- Comfortable working across multiple codebases and projects simultaneously;
- Experience with databases (primarily SQL) and data modeling for real-world applications;
- Attention to detail and strong testing experience.

Nice-to-Have:
- Knowledge of current AI models/services and their tradeoffs and advanced NLP techniques;
- Experience fine tuning models and building advanced chat bots;
- Familiarity with automated, testing frameworks (e.g., Jest, Cypress);
- Experience with monitoring, logging, and production debugging.

What the client offers:
- Competitive salary + performance bonuses;
- Remote‑first, outcome‑driven culture (potential for hybrid in Kyiv);
- Direct access to leadership, fast decisions, zero corporate layers;
- Opportunity to build and lead the AI function as we scale.