Our client, a top IT consultancy, is partnering with a leading financial services organisation, to build a dedicated Generative AI hub in Valencia. This new unit will serve as the engine for organisation's AI-driven transformation, designing and delivering intelligent solutions that modernise financial processes, automate decision-making, and unlock new value across the organisation.

We are looking for a Senior Backend Developer to be one of the founding engineers of this hub. You will help define the technical foundations of an Agentic AI platform built on Azure, contributing from day one to architecture decisions, infrastructure setup, and the delivery of production‑grade AI‑powered services for the financial sector.

Key Responsibilities

Design and build the backend services and APIs that power the organisation's Generative AI platform, using Node.js or .NET 8 (ASP.NET Core / EF Core)

Implement data ingestion, chunking, cleaning and quality checks pipelines using Azure Data Factory and Azure Document Intelligence

Build and maintain vector indexing and semantic search capabilities via Azure Cognitive Search and LightRAG

Build and integrate agent tooling using Langchain, Langgraph, FastAPI, A2A, AG-UI and MCP

Implement the AIDA orchestration and coordination layer using Mastra (Multi-Agentic Orchestrator)

Ensure platform observability and alerting via Azure Monitor and Azure Log Analytics

Implement evaluation pipelines for LLM outputs using Azure ML

Apply guardrails and output validation using Azure OpenAI and Azure Machine Learning

Manage secrets and configuration securely via Azure Key Vault

Contribute to the technical culture of the hub: code reviews, documentation,



architecture decisions, and engineering best practices

Node.js or.NET 8 (ASP.NET Core, Entity Framework Core)

Azure Data Factory — ingestion, chunking, cleaning, DQ checks

Azure Document Intelligence — document parsing and understanding

Azure Cognitive Search — vector indexing and semantic search

Azure OpenAI — LLM access, embedding generation, guardrails and output validation

Azure Machine Learning — model evaluation and ML guardrails

Storage & Databases

Azure SQL ·PostgreSQL — relational data and metadata storage

Azure Cosmos DB — short-term and long-term agent memory

Azure Blob Storage — file and document storage

Agent Infrastructure

Langchain & Langgraph — agent orchestration and chaining

FastAPI — lightweight API layer for agent tooling

A2A, AG-UI, MCP — agent-to-agent communication and UI protocols

Platform & DevOps

Azure Key Vault — secrets and keys management

Required Skills & Experience

5+ years of backend development experience in production environments

Strong proficiency in Node.js OR .NET 8 / ASP.NET Core (or both)

Solid hands‑on experience with Azure cloud services: ADF, Cognitive Search, OpenAI, SQL, Cosmos DB





Experience building RESTful APIs and microservices in regulated or high‑availability environments

Familiarity with vector databases, embeddings and RAG‑based architectures

Understanding of Agentic AI patterns: multi‑agent systems, tool use, orchestration, memory layers

Experience with containerisation (Docker / Kubernetes / AKS)

Proficiency in SQL (Azure SQL, PostgreSQL)

Strong understanding of security best practices: authentication, RBAC, secrets management

Experience with CI/CD pipelines and DevOps practices on Azure

Ability to work autonomously in a greenfield, fast‑paced environment

Fluent English — working language for all technical documentation and ceremonies

Location - preferably Valencia, but open to other locations with availability to travel occasionally to Valencia; remote in that case.

Nice to Have

Experience with Python / FastAPI for agent tooling layers

Knowledge of Langchain, Langgraph or similar LLM orchestration frameworks

Familiarity with MCP (Model Context Protocol), A2A or AG-UI protocols

Prior experience in a hub or centre‑of‑excellence environment

Background in financial services, banking or fintech

Why Join This Team

Founding engineer role — shape the architecture and culture of a brand‑new GenAI hub from day one

Work at the cutting edge of Agentic AI applied to real financial services use cases

Backed by the organisation's general engineering community, tooling and career development programmes

Valencia-based hub with a collaborative, senior‑weighted team

Direct exposure to the company's transformation agenda and senior stakeholders

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📌 Senior Backend Developer (Madrid)
🏢 ISG International Service Group
📍 Madrid