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Malt Strategy
Adrian Brea NuñezAB

Adrian Brea Nuñez

Senior Backend Developer .NET, APIs, SaaS & Cloud

€200/day
La Coruña, ES
3-7 years
.NET
Microsoft Azure
ASP.NET Core
Back-End development
API REST

Average response time: 1 hour

About Adrian

I specialize in building and modernizing production-grade systems for SaaS platforms. With 4+ years of intensive experience, I bridge the gap between complex business logic and scalable cloud infrastructure.

My focus is on reliability, performance, and clean architecture. I don’t just write code; I design systems that stay up under pressure and evolve without friction.
Technical Expertise

► Backend Ecosystem (.NET & Python)

C# / .NET: .NET 8/7, ASP.NET Core, Web API, Entity Framework Core, LINQ.

Python: FastAPI (high-performance services), Pydantic, SQLAlchemy.

Architecture: Microservices, Clean Architecture, DDD, RESTful APIs.

► Cloud & DevOps (Azure Specialist)

Azure: App Services, Azure Functions (Serverless), Azure Service Bus, Key Vault, Blob Storage.

Containers: Docker & Docker Compose.

CI/CD: GitHub Actions, Azure DevOps Pipelines.

► Data & Security

Databases: PostgreSQL (Expert), SQL Server, Redis (Caching).

Security: OAuth2, OpenID Connect, JWT, Role-Based Access Control (RBAC).

► Tools & Methodology

VCS: Git (GitHub, GitLab, Bitbucket).

Testing: xUnit, NUnit, Pytest (Integration & Unit Testing).

Agile: Scrum, Kanban, Jira, Linear.

What I Solve for You

Modernization: Refactoring legacy monoliths into modern .NET/Python microservices.

Scaling: Optimizing database queries and implementing caching strategies to handle high traffic.

Integrations: Connecting your platform with 3rd party APIs (Payments, CRMs, Auth providers).

Cloud Migration: Moving your on-premise logic to a fully automated Azure environment.
Hotel industry
Software Publishing
Public Sector
Digital and IT Services
Telecommunications

  • Spanish

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Teknei
    Senior Software Engineer
    PRESS AND MEDIA
    October 2025 - Today (9 months)
    Madrid, Spain
    Working on the modernization of legacy backend systems, migrating existing solutions to modern .NET-based architectures.

    My responsibilities include designing authentication and authorization mechanisms using OpenID Connect and OAuth 2.0, as well as defining security boundaries across services.

    I’m involved in the design of modular monolithic architectures with a clear path towards future microservices adoption, focusing on scalability, maintainability, and resilience.

    Key contributions:
    - Migrating legacy .NET projects to modern .NET versions and Linux environments
    - Designing authentication and authorization flows using OpenID Connect and OAuth 2.0
    - Building a shared logging library using aspect-oriented programming, OpenTelemetry, and Castle DynamicProxy
    - Defining observability standards (logs, traces, metrics)
    - Designing backend architectures and database models
    - Applying resilience patterns and contributing to CI/CD pipelines
    .NET CI/CD OAuth Docker Software Architecture
  • Plexus Tech
    Software Engineer
    TRAVEL AND TOURISM
    January 2023 - October 2025 (2 years and 9 months)
    Santiago de Compostela, Spain
    Backend development for a large-scale booking platform used by a multinational hotel chain.

    I worked mainly on backend APIs and distributed systems, focusing on performance, scalability, and reliability in production environments.

    In addition to the core .NET platform, I developed auxiliary backend services using Python and FastAPI for integrations and supporting use cases.

    Key responsibilities:
    - Designing and implementing backend services using .NET, Clean Architecture, and DDD
    - Building and maintaining APIs for internal and external clients
    - Developing FastAPI services for integrations
    - Migrating legacy .NET Framework services to .NET Core
    - Optimizing database performance and introducing Redis caching
    - Designing CI/CD pipelines and monitoring systems
    ASP.NET Core Micro-services Microsoft Azure CosmosDB Python
  • Nextgal Soluciones Informáticas S.L
    Junior Software Engineer
    TELECOMMUNICATIONS
    January 2022 - January 2023 (1 year)
    Corunna, Spain
    Worked on internal tools and backend systems supporting warehouse monitoring and data processing.

    Responsibilities:
    - Developing .NET APIs to process and expose data
    - Building automated data collection tools
    - Creating internal monitoring utilities
    - Fixing bugs and improving stability across applications
    .NET Back-End development SQL Server Unit Testing Razor

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Education

  • Ciclo Formativo de Grado Superior
    IES Fernando Wirtz
    2022
    Ciclo Formativo de Grado Superior

Skill set

PostgreSQL
Docker
CI/CD
FastAPI
Python

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