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# Senior Backend Developer

- **Company:** ISG International Service Group
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** ASP.NET, .NET Framework, Application Programming Interfaces (APIs), Artificial Intelligence, User Authentication, Microsoft Azure, Cloud Storage, Code Review, Databases, Relational Databases, DevOps, Document Management Systems, Entity Framework, Python (Programming Language), Key Management, PostgreSQL, Log Analysis, Machine Learning, Metadata, SQL Azure, Node.Js, Role-Based Access Control, Azure Machine Learning, Search Technologies, SQL Databases, Data Ingestion, Azure Data Factory, Large Language Models, Multi-Agent Systems, Model Validation, Generative AI, Backend, Fastapi, Build Management, Containerization, Kubernetes, Cosmos DB, Virtual Agents, Restful APIs, Docker, Key Vault, Microservices
- **Published:** August 16, 2026
- **Apply:** https://www.buscojobs.com.es/senior-backend-developer-en-madrid-ID-367456234

## About the Role

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

## Description

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 ResponsibilitiesDesign 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 IntelligenceBuild and maintain vector indexing and semantic search capabilities via Azure Cognitive Search and LightRAGBuild and integrate agent tooling using Langchain, Langgraph, FastAPI, A2A, AG-UI and MCPImplement the AIDA orchestration and coordination layer using Mastra (Multi-Agentic Orchestrator)Ensure platform observability and alerting via Azure Monitor and Azure Log AnalyticsImplement evaluation pipelines for LLM outputs using Azure MLApply guardrails and output validation using Azure OpenAI and Azure Machine LearningManage secrets and configuration securely via Azure Key VaultContribute to the technical culture of the hub: code reviews, documentation, architecture decisions, and engineering best practicesNode.js or.NET 8 (ASP.NET Core, Entity Framework Core)Azure Data Factory - ingestion, chunking, cleaning, DQ checksAzure Document Intelligence - document parsing and understandingAzure Cognitive Search - vector indexing and semantic searchAzure OpenAI - LLM access, embedding generation, guardrails and output validationAzure Machine Learning - model evaluation and ML guardrailsStorage & DatabasesAzure SQL ·PostgreSQL - relational data and metadata storageAzure Cosmos DB - short-term and long-term agent memoryAzure Blob Storage - file and document storageAgent InfrastructureLangchain & Langgraph - agent orchestration and chainingFastAPI - lightweight API layer for agent toolingA2A, AG-UI, MCP - agent-to-agent communication and UI protocolsPlatform & DevOpsAzure Key Vault - secrets and keys managementRequired Skills & Experience5+ years of backend development experience in production environmentsStrong 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 DBExperience building RESTful APIs and microservices in regulated or high?availability environmentsFamiliarity with vector databases, embeddings and RAG?based architecturesUnderstanding of Agentic AI patterns: multi?agent systems, tool use, orchestration, memory layersExperience with containerisation (Docker / Kubernetes / AKS)Proficiency in SQL (Azure SQL, PostgreSQL)Strong understanding of security best practices: authentication, RBAC, secrets managementExperience with CI/CD pipelines and DevOps practices on AzureAbility to work autonomously in a greenfield, fast?paced environmentFluent English - working language for all technical documentation and ceremoniesLocation - preferably Valencia, but open to other locations with availability to travel occasionally to Valencia; remote in that case.Nice to HaveExperience with Python / FastAPI for agent tooling layersKnowledge of Langchain, Langgraph or similar LLM orchestration frameworksFamiliarity with MCP (Model Context Protocol), A2A or AG-UI protocolsPrior experience in a hub or centre?of?excellence environmentBackground in financial services, banking or fintechWhy Join This TeamFounding engineer role - shape the architecture and culture of a brand?new GenAI hub from day oneWork at the cutting edge of Agentic AI applied to real financial services use casesBacked by the organisation's global engineering community, tooling and career development programmesValencia-based hub with a collaborative, senior?weighted teamDirect exposure to the company's transformation agenda and senior stakeholders#J-*****-Ljbffr


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