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Oscar F.OF

Oscar F.

Senior Backend & Integration Engineer | AI & APIs

€200/day
Barcelona, ES
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Oscar

Senior Engineer specialized in Backend Architecture, Complex Integrations, and Process Automation.

I help companies transform business needs into robust, scalable, and reliable technical solutions in production. My approach is pragmatic: understand the real problem, design an adequate architecture, and execute with technical quality.

What do I bring to your project?

Integration of critical ecosystems
Experience connecting platforms through APIs and Web Services (REST/SOAP). Extensive background in the logistics sector, integrating operators such as GLS, UPS, DHL, Fedex, MRW, CTT, etc., as well as WMS systems for stock synchronization, traceability, and operational flow automation.

Applied AI and Machine Learning
Development of data pipelines and ML models when they provide real business value. Experience in financial modeling using signal processing techniques (FFT/Fourier) to extract patterns and improve predictive analysis.

Software Engineering and Technical Architecture
Ability to work on projects of high technical complexity, both in the evolution of existing systems and in the design of new solutions. Experience in advanced automation, modular architectures, and low-level components focused on orchestration and controlled execution of workflows.

Data for Decision Making
Experience in SQL databases and data exploitation for BI, reporting, and predictive analysis. I don't just connect systems: I also help structure and leverage data to generate real value in operations and business.

My Methodology

I am accustomed to working on existing systems, integrating third parties seamlessly, and reducing manual tasks through automation. My focus is on traceability, maintainability, and reliability: solutions that not only work but can be sensibly maintained and scaled.
  • Spanish

    Native or bilingual

  • English

    Fluent

  • German

    Fluent

  • Catalan

    Native or bilingual

Can work on-site
Barcelona (up to 50km)

Experience

  • COSMIC SAU
    Global Logistics Integration GLS, Envia, Tipsa
    LUXURY GOODS
    January 2022 - March 2026 (4 years and 2 months)
    Barcelona, Spain
    Development of a unified abstraction layer for managing international and national logistics. I have designed and implemented the complete shipping cycle (labeling, tracking, pickup, and incident management) by connecting core platforms with the main web services in the sector.
    Your "Silver Bullets" (What makes you stand out):

    Expertise in Mixed Protocols: Full mastery of SOAP/WSDL (classic for DHL/Tipsa) and REST/JSON (modern for UPS/GLS), resolving inconsistencies in provider documentation.

    Data Normalization: Creation of a unique data model that allows switching carriers (e.g., from DHL to UPS) without altering the client's business logic.
    Label and Documentation Management: Dynamic generation of thermal labels (ZPL/EPL) and internationalization of customs documents.
    Web Services Node.js REST API API API Integration
  • Line Logistics
    Fullstack Enterprise Ecosystem & Integration Middleware
    LOGISTICS AND SUPPLY CHAIN
    September 2020 - January 2022 (1 year and 4 months)
    Barcelona, Spain
    Technical leadership in the development of a scalable distributed architecture using the MEAN stack (MongoDB, Express, Angular, Node.js). The core of the project consisted of creating a robust Middleware layer for data orchestration between legacy systems and modern services.
    Key Points (Achievements):

    Critical Interoperability: Design and implementation of hybrid connectors for integrating legacy SOAP (XML) services with modern REST (JSON) architectures, ensuring real-time data integrity.

    High-Performance Frontend: Development of complex interfaces in Angular with advanced state management, optimizing user experience in dashboards with high information density.

    Security and Scalability: Configuration of secure authentication flows and optimization of queries in the Node.js backend to reduce latency in external endpoint calls.

    Documentation and Standards: Implementation of clear API contracts and schema validation to facilitate long-term maintenance.
    Node.js Web Services JavaScript AngularJS

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Education

  • Higher Technical Degree in Computer Science
    Universitat Autònoma de Barcelona
    2002
  • Master in Logistics and Operations
    Icil
    2013

Skill set (50)

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