YLD is a software engineering and design consultancy with offices in London, Lisbon, and Porto. We help our clients develop competitive capabilities and create lasting digital solutions. The AI Engineer role builds new AI-powered features that meet client customer needs and improves the Digital Platform with intelligent capabilities. Engineers work in an Agile/Scrum environment emphasizing test-first development, pair programming, and code reviews with continuous delivery practices.

Key Responsibilities:

Building new AI-powered features meeting customer needs
Continuously delivering AI model integrations and prompt optimizations
Collaborating on both traditional and AI engineering initiatives
Participating in show-and-tell presentations
Attending client internal events

Required Skills & Experience:

Core Programming & AI:

Strong JavaScript, TypeScript, and Python proficiency
Advanced GenAI/LLM expertise: RAG, embeddings, vector search, prompt engineering, evals, guardrails, caching, chaining, function calling
Fine-tuning expertise (LoRA/QLoRA, instruction tuning, RLHF)
Agentic architecture design and multi-agent systems

Agentic AI Frameworks:

LangChain
LlamaIndex
LiteLLM
CrewAI
Mastra
API integrations (OpenAI, Anthropic)

Infrastructure & DevOps:

CI/CD pipelines and Infrastructure as Code (Terraform, CloudFormation, CDK)
Cloud platforms: AWS, Azure, GCP
Containerization: Docker, Kubernetes
LLM hosting: vLLM, TGI, local deployment

Data & Databases:

Vector databases (Pinecone, Weaviate, Chroma, Qdrant)
Traditional databases (PostgreSQL, Neo4j)
Data pipeline design for RAG
Real-time data streaming

Frontend & APIs:

React or modern UI frameworks
API design for LLM services
Multiple protocols (HTTP, GraphQL, gRPC, WebSockets, MCP)
Real-time chat and streaming response handling

Performance & Reliability:

High-performance, scalable AI applications
Token management and cost optimization
Production monitoring and observability
Comprehensive testing (unit, integration, AI behavior, security, accessibility)

Benefits:

Company private healthcare
Enhanced maternity/paternity leave (up to 6 months, fully paid)
25 days annual holiday (plus public holidays)
€2,000 annual training/conferences allowance
€300 annual hardware allowance
Wellness and performance support (therapy and coaching)
Discretionary bonus based on company performance
Company laptop
Generous referral schemes
Remote-first working environment

Recruitment Process:

Initial interview with Talent team (30-45 minutes)
Technical interview with Senior Developers (1.5 hours)

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