AI / Full Stack Engineer (TypeScript/Node.js, React)

About Webellian
Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy.

About the role
We are seeking a Senior AI/Full Stack Engineer to join our team and drive the development of AI-powered solutions for our clients. You will work on projects that combine modern web development with applied AI - from building intelligent agents and search systems to deploying and optimizing language models on dedicated infrastructure.

This role bridges two worlds: solid full-stack engineering and practical AI/ML implementation. You'll design, build, and ship products that leverage LLMs, RAG, and other AI techniques to solve real business problems.
 
Your responsibilities

• Designing and developing full-stack applications with AI capabilities

• Deploying, configuring, and optimizing LLMs (both cloud APIs and self-hosted)

• Building and maintaining RAG pipelines, vector search, and knowledge retrieval systems

• Integrating AI systems with external services and APIs

• Evaluating and selecting appropriate models and tools for specific use cases

• Writing clean, maintainable code with tests and documentation

• Proposing technical improvements and architectural decisions

• Supporting and mentoring less experienced team members

Must-have requirements

AI/ML:

• Hands-on experience with LLM deployment and serving (cloud APIs and/or self-hosted solutions)

• Experience building RAG systems (embeddings, vector stores, retrieval strategies)

• Understanding of prompt engineering and agent/tool-use patterns

• Ability to evaluate model performance and make informed trade-off decisions

Full Stack:

• 5+ years in full-stack development with TypeScript/Node.js, Nest.js

• Frontend experience with React

• Relational databases (PostgreSQL or similar), Redis

• Docker, basic CI/CD

Soft skills:

• Self-driven, able to take ownership of projects end-to-end

• Strong problem-solving skills

• English B2+ (C1 preferred)

• Excellent communication - able to translate technical concepts for non-technical stakeholders

Nice-to-have

• Experience with model fine-tuning (LoRA, QLoRA)

• MLOps practices (experiment tracking, model versioning)

• Familiarity with agent frameworks (LangChain, Vercel AI SDK, or similar)

• Experience with GPU infrastructure and model optimization (quantization, inference tuning)

• AWS or other cloud provider (working knowledge)

What we offer

• Projects at the intersection of AI and software engineering

• Opportunity to work with cutting-edge AI tooling and local GPU infrastructure

• Autonomy and ownership over technical decisions

• Hybrid work mode

• Small, collaborative team

• Challenging problems - no boring CRUD work