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Andrés MejíaAM

Andrés Mejía

Malt Linker

Architect and Full Stack Software Developer

400 €/día
21 proyectos
Valencia, ES
>15 años

Tiempo medio de respuesta: 1h

Acerca de Andrés

Senior Software Architect & Full-Stack Engineer with 20+ years of experience delivering mission-critical systems across banking, insurance, airline, and fintech sectors.

Backend (primary stacks):
Java: Spring Boot, Spring Framework, J2EE, Quarkus, Apache Camel
Python: FastAPI, asyncio, LangChain, LlamaIndex, Kafka/Faust, RAG, LLM integration
.NET: C#, ASP.NET Core, Minimal API, Web API

Frontend:
Angular (up to v21), React, Vue.js — TypeScript, component architecture, REST/GraphQL
AI & LLM: RAG pipelines, vector databases, agentic workflows, MCP, OpenAI, Anthropic

Integration & Architecture:
API design (REST, SOAP, GraphQL, gRPC), Event-Driven Architecture, Apache Kafka, RabbitMQ, Debezium
Patterns: Hexagonal, DDD, TDD, Saga, CQRS, Event Sourcing, Vertical Slice, Modular Monolith

Cloud & DevOps:
AWS (EKS, MSK, Lambda, API Gateway), Azure (AKS, Functions, Container Apps, API Gateway)
OpenShift, Kubernetes, Docker, CI/CD (GitHub Actions, Jenkins, GitOps), Terraform

Also experienced with Node.js, Go, and PHP for backend and integration scenarios.

Fully remote · Spanish & English.
  • Inglés

    Competencia profesional completa

  • Español

    Bilingüe o nativo

Solo teletrabajo
Lleva a cabo sus proyectos principalmente en remoto

Experiencia

  • Santa Lucía Seguros
    Software Architect
    EDICIÓN DE SOFTWARE
    agosto de 2025 - junio de 2026 (10 meses)
    Valencia, España
    Worked as Software Architect for Santa Lucía's corporate applications division, designing and evolving backend services and integration layers across Java and .NET stacks in a regulated insurance environment.

    • Architected microservices using Spring Boot and .NET Core, applying Hexagonal Architecture and DDD patterns to ensure clean domain boundaries and long-term maintainability
    • Designed and implemented REST and SOAP API integrations with internal and external systems, following contract-first API design principles
    • Built and evolved middleware integration layers using Apache Camel and messaging with Kafka and ActiveMQ
    • Led technical decisions on CI/CD pipelines, code quality standards, and deployment on OpenShift
    • Collaborated directly with product and business teams in Agile/Scrum ceremonies, translating requirements into technical designs and implementation plans
    Spring boot OpenShift Microservices .NET Kafka
  • NESTLÉ / NESPRESSO
    Integration & Backend Architect
    EDICIÓN DE SOFTWARE
    febrero de 2025 - febrero de 2026 (1 año)
    Valencia, España
    Worked as Integration and Backend Architect on the Rubicon platform, Nestlé's B2B e-commerce solution for Nespresso professional clients. Responsible for backend architecture, API design, and integration with third-party systems across a high-traffic enterprise environment.

    • Designed and implemented REST API integrations between Rubicon and external logistics, payment, and ERP systems, applying contract-first API design with OpenAPI specifications
    • Architected backend microservices in Java Spring Boot and Python, handling order management, product catalog, and client account workflows
    • Designed event-driven communication patterns between platform services using Kafka and AWS messaging services
    • Led architecture decisions on cloud infrastructure (AWS), container deployments, and CI/CD pipelines
    • Worked in a distributed international team following SAFe agile methodology, reporting to senior stakeholders and coordinating cross-functional delivery
    Spring boot FastAPI Kubernetes AWS Kafka
  • FENORA
    Founder & AI Backend Architect
    EDICIÓN DE SOFTWARE
    febrero de 2025 - Hoy (1 año y 6 meses)
    Valencia, España
    Founded and architected FENORA, a B2C personal finance SaaS powered by AI, built on Open Banking PSD2 infrastructure. Designed the full backend and AI layer from scratch with production-grade reliability as a core requirement.

    • Designed and implemented RAG pipelines for personalized financial advice, combining vector search with real user transaction context
    • Integrated multiple LLM providers (OpenAI, Anthropic Claude) with fallback strategies and cost optimization
    • Built embeddings workflows using vector databases (Chroma, Pinecone) for semantic search over financial documents
    • Developed an agentic AI financial advisor (Sofía) using LangChain, LlamaIndex, and MCP for structured tool use
    • Python backend with FastAPI, async/await, Pydantic, and OpenAPI contracts
    • Deployed on AWS: Lambda, API Gateway, ECS, RDS (PostgreSQL), with CI/CD via GitHub Actions
    Python FastAPI Langchain OpenAI Amazon Web Services

Reseñas

4,0

de 1 valoraciones

A

Alejandro

Alejandro Torres

Revisado el 18/7/2021

Andrés es un gran profesional con una calidad en el trabajo impecable y comprometido con el proyecto. La arquitectura y la puesta en producción son sin duda sus puntos fuertes. Siempre intenta que el trabajo tenga un alto nivel de calidad y evita la solución de problemas mediante parches o "ñapas" incluso llegando a, en ocasiones, a rehacer el trabajo de dos semanas. La comunicación con el ha sido buena, aunque en ciertos puntos ha habido que recordar o repetir ciertas funcionalidades. Lo peor sin duda ha sido el cumplimiento de las fechas, aunque viendo la calidad, creo que merece la pena.

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Formación

  • Ingenieria en Telecomunicaciones
    Corporación Universitaria de Colombia IDEAS
    2009

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