Available to hire
Hi, I’m Ángel Guzmán Maeso, a results-driven Senior Backend Engineer with over 20 years of experience leading cross-functional teams to deliver scalable, high-performance web applications. I enjoy mentoring engineers, fostering technical excellence, and aligning solutions with business goals, especially in mental health and human-centric innovation. In my work, I build robust systems and guide teams toward faster, reliable delivery while keeping a clear focus on impact and user value.
I specialize in Node.js, PHP (Symfony), and cloud-native architectures using AWS and Kubernetes. I’m passionate about shaping teams, driving CI/CD, and delivering maintainable software. I thrive in collaborative environments where curiosity, craftsmanship, and continuous learning drive success.
Work Experience
CEO & Senior Backend Engineer (Freelance) at Quijost
October 1, 2009 - PresentLed cross-functional teams to design and deploy scalable web applications using PHP (Symfony), Node.js, and Python (Django), serving 350+ clients globally. Implemented CI/CD pipelines with GitLab, managed AWS infrastructure (EC2, S3, ELB), containerized deployments with Docker and Kubernetes, and optimized databases (MySQL, MongoDB, PostgreSQL). Mentored junior developers and fostered a culture of collaboration and continuous improvement.
Advisory Board Member at Malt Community S.L
May 1, 2023 - PresentRepresented the freelancer community on Malt’s Advisory Board, shaping product strategy for a platform serving 80,000+ clients and 800,000+ freelancers. Drove initiatives focused on social impact and cross-functional collaboration to improve tools for freelancer-client connectivity.
Senior Tech Lead at Estrim APP S.L
June 1, 2022 - October 9, 2025Led a team of 12 engineers across frontend, DevOps, security, QA, and product to deliver the Estrim platform. Architected a microservices backend (PHP Symfony) with hexagonal architecture and DDD, integrating Node.js and Go modules for data streaming via Livekit. Designed scalable DigitalOcean/K8s infrastructure ensuring zero downtime during high-traffic events, and reduced deployment times by 25%.
Senior Tech Lead at Estrim APP S.L
May 1, 2023 - October 9, 2025Continued leadership for high-traffic events and real-time streaming, coordinating CI/CD improvements and database optimization to support thousands of simultaneous connections.
Tech Lead (Freelance) at VerifyTech
December 1, 2019 - October 9, 2025Led a team of 6 engineers to develop a verification platform, overseeing architecture and task coordination, resolving technical conflicts, and ensuring scalability and performance.
Senior Backend Engineer - AI Solutions - Services & Core (Partner) | GKE/K8 at BASF
October 1, 2022 - October 9, 2025Tech Lead for a team of 4. Developed internal application using Node + Express + Nuxt; built GitLab-based pipelines; implemented unit/integration/acceptance tests with Jest, Mocha, Chai. Worked with large-volume MongoDB and PostgreSQL databases; defined schemas/models for high-performance queries; integrated data imports/exports with SAP HANA.
Senior Backend Engineer at FICHATECNICACOCHE S.L.
March 1, 2024 - October 9, 2025Developed Python-based backend for high-volume PDF processing with Tesseract OCR, implemented ETL for RAG workflows, and integrated with BigQuery for efficient querying.
Senior Backend Engineer & Sysadmin at Miguel Heredia Torrado
March 1, 2024 - October 9, 2025Urgent server analysis on Plesk-based web server, resolved corrupted Nginx and SSL configurations, implemented SSL updates, and ensured persistence in Plesk configs.
Senior Backend Engineer at Internet Stores S.L.
December 1, 2022 - October 9, 2025Upgraded Symfony templates and PHP 7.x stack; integrated Elasticsearch and Algolia for improved search; managed deployments on dedicated servers; resolved PHP errors and synchronized project versions.
Senior Backend Engineer at MerchantTek OÜ
November 1, 2022 - October 9, 2025Migrated seven brand websites from OVH to AWS (EC2, RDS); upgraded PHP to 8.1; implemented CloudFormation for automated deployments; optimized clean architecture and query performance; deployed microservices-based architectures.
Senior Backend Engineer at Mundoarti Global SL
August 1, 2022 - October 9, 2025Optimized Dockerfiles for AWS deployment (ECR); fixed PHP/Symfony bugs; integrated Vue.js features and Amazon SES for email; improved performance of existing features.
Senior Backend Engineer at Nordik Solutions
July 1, 2022 - October 9, 2025Reviewed and enhanced a Laravel/PHP project; integrated Redsys and Stripe for payments; improved overall code quality.
Senior Backend Engineer at Befran Consultores SL
July 1, 2022 - October 9, 2025Migrated CodeIgniter database, restructured legacy and new code, and updated DNS configurations to improve performance.
Senior Backend Engineer at CoRegistros S.L.U.
May 1, 2022 - October 9, 2025Developed a private REST API in Symfony 5.4 with PHP 8.0, implemented hexagonal architecture and microservices for large-scale MySQL database.
Senior Backend Engineer at Escuela de Administración Liderazgo Dirección y Emprendimiento SL
April 1, 2022 - October 9, 2025Adapted Salesforce VisualForce (Apex) email templates and integrated Redsys-based PHP payment forms with secure REST API.
Senior Backend Engineer at NYXELL SDAD COOP
March 1, 2022 - October 9, 2025Refactored native PHP code to PSR standards for maintainability and best practices.
Senior Backend Engineer at Pasico 2
February 1, 2022 - October 9, 2025Deployed Laravel 8 app with Forex XTB API on DigitalOcean; configured Mailgun, Telegram API, Redis; set up Nginx and domain provisioning.
Developer at LxCenter
June 1, 2012 - October 9, 2025Developed features for Kloxo and HyperVM, focusing on system administration and automation.
Intern Backend Engineer – Core and Scalability at Tuenti Tecnologies S.L
October 1, 2011 - October 9, 2025Implemented backend and API for Tuenti; contributed to backend images team for distributed storage, CDN-based delivery, and scaling of image content.
Education
Ingeniería Informática Superior at Universidad de Castilla-La Mancha
January 1, 2005 - January 1, 2012Qualifications
CCNA - Cisco Certified Network Associate - Level 1
January 11, 2030 - October 9, 2025Finanzas personales
January 11, 2030 - October 9, 2025Industry Experience
Software & Internet, Professional Services, Media & Entertainment
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