Jesús Díez Carnicero
Principal Backend Engineer & Cloud Architect
Esplugues de Llobregat (Barcelona)
Software engineer with 20+ years of experience leading teams and building, maintaining, and evolving scalable backend systems in cloud-native environments. Specialized in DDD, event-driven architectures, and multi-tenant platforms, with AI applied to product.
Proven track record leading teams, improving engineering culture, and delivering results. Focused on clean architecture, automation, and long-term maintainability. Migrated monoliths to microservices (and vice versa), delivering secure, compliant systems for high-volume, high-growth industries such as healthtech, legal, and eCommerce.
Core Expertise
Backend Architecture
- Domain Driven Design (DDD)
- Event-driven architectures
- Microservices ↔ Monoliths
- Multi-tenant platforms
- Clean / Hexagonal Architecture
AI-Enabled Engineering
- Generative AI on AWS
- Spec-driven development
- Model training (PyTorch)
- Computer vision with MediaPipe
- AI integration in product
Cloud and DevOps
- AWS, GCP
- IaC with Terraform, GitOps
- CI/CD and Automation
- SQS / RabbitMQ / Kafka
- Observability
Practices
- Testing and Quality
- Legacy code modernization
- Technical documentation
- Continuous refactoring
Languages and Frameworks
- Node.js: Express, NestJS
- PHP: Symfony, Laravel
- Python: FastAPI
Leadership
- Team leadership
- Architecture and technical vision
- Engineering culture
- Documentation and quality
Experience
Feb 2024 - Today (2 yrs)
|
Barcelona (Hybrid)
Technical Lead (Backend)
Teladoc Health Int.
Feb 2024 - Today (2 yrs) | Barcelona (Hybrid)
Technical Lead (Backend)
Teladoc Health Int.
- Migrated core services to cloud-native architecture, ensuring compliance across 5+ markets.
- Built AI applications with AWS Bedrock for internal use cases.
- Improving documentation, observability, security, compliance, architecture, and agile delivery.
- Hands-on development of FastAPI and Node.js microservices.
Mar 2022 - Feb 2024 (2 yrs)
|
Barcelona (Hybrid)
Technical Lead
Improfit.ai
Mar 2022 - Feb 2024 (2 yrs) | Barcelona (Hybrid)
Technical Lead
Improfit.ai
- Optimized cloud architecture with IaC and GitOps, enabling DevOps.
- Improved quality and testing pipelines.
- Trained models with PyTorch and used MediaPipe for computer vision.
- Prototyped and validated multiple verticals (FastAPI, Android, Node.js) in lean cycles.
- Migrated a monolith to a modular multi-tenant app to support scale and flexibility.
Feb 2021 - Mar 2022 (1 yr 2 mos)
|
Barcelona (Remote)
Technical Lead
Meeting Lawyers
Feb 2021 - Mar 2022 (1 yr 2 mos) | Barcelona (Remote)
Technical Lead
Meeting Lawyers
- Led technical and product execution in an early-stage B2B legal-tech startup.
- Defined the roadmap and delivery practices, and built the first engineering team.
- Launched the MVP on AWS using PHP microservices and drove initial user validation.
May 2016 - Oct 2020 (4 yrs 6 mos)
|
Barcelona
Technical Lead
Ulabox
May 2016 - Oct 2020 (4 yrs 6 mos) | Barcelona
Technical Lead
Ulabox
- Led logistics and product projects.
- Pushed CI/CD and improved pipeline time by 70%.
- Standardized API specs and documentation (OpenAPI).
- Researched and migrated systems to Kubernetes on GCP.
Nov 2015 - Feb 2016 (4 mos)
|
Barcelona
Senior Software Engineer
CMP Group (now Mad Collective)
Nov 2015 - Feb 2016 (4 mos) | Barcelona
Senior Software Engineer
CMP Group (now Mad Collective)
- Maintained and evolved a Symfony DDD API in the mailing team.
Jul 2013 - Nov 2015 (2 yrs 5 mos)
|
Barcelona
Senior Software Engineer
Akamon (now Tangelo Games)
Jul 2013 - Nov 2015 (2 yrs 5 mos) | Barcelona
Senior Software Engineer
Akamon (now Tangelo Games)
- Led the payments tech area applying clean architecture and DDD patterns.
- Reduced PSP integration from weeks to days with a new API (+10 PSPs).
- Reduced chargebacks by 30% with a fraud detection layer.
Jan 2013 - Jul 2013 (7 mos) | Barcelona
Lead Developer
iParquing (now EasyPark)
May 2012 - Jan 2013 (9 mos) | Barcelona
Team Lead (Payments)
LetsBonus
Mar 2011 - Apr 2012 (1 yr 2 mos) | Barcelona
Senior Web Developer
TuManitas.com
Mar 2009 - Feb 2011 (2 yrs)
Web Developer
Matinée Group
Sep 2004 - Oct 2011 (7 yrs 2 mos)
CTO/CEO
RIVO10 Digital
Feb 2003 - Jun 2003 (5 mos)
Web Developer
Reinicio Comunicación (Zaragoza)
Strengths
Clean architecture
Maintainable systems with DDD, event-driven patterns, and long-term vision.
Scalability
Monolith-to-microservices migrations and multi-tenant platforms.
Technical leadership
Mentoring, engineering culture, and delivery practices.
Automation and quality
CI/CD, observability, security, and compliance.
Education
2006
Master in Advanced Java programming and architecture (Sun Microsystems Official)
PUE - Universitat Politécnica de Catalunya (BCN)
2000 - 2004
B.Sc. Hons. in Computing Science
University of Wales
Studied at Fund. San Valero (Zaragoza, Spain).
Latest Training
ThePowerMBA
Exponential Leaders
Jun 25
Pluralsight | A Cloud Guru
Amazon DynamoDB Deep Dive
Apr 25
Skillsoft
Advanced Architecting on AWS
Dec 24
Skillsoft
DevOps Engineering on AWS
Nov 24
Pluralsight | A Cloud Guru
Advanced Terraform with AWS
Aug 24
LIDR
Tech Leadership Master
Feb 24
Félix Lopez
Engineering Manager Training
Sep 21
Entrepreneurial Experience
Nov 2009 - Mar 2011 (1 yr 5 mos)
Superb Fashion SL
Side business focused on fashion retail. Built a custom eCommerce platform and integrated multiple payment providers.
Apr 2010 - Sep 2011 (1 yr 6 mos)
RIVO10 Digital SL
Shifted from full-time focus to a side business. Delivered end-to-end bespoke solutions (systems to frontend) with a LAMP stack (Linux, Apache, PHP, MySQL), intranets, CMS, and API integrations.
Let's Work Together
Always open to new opportunities, challenging projects, and innovative ideas. If you need a senior technical profile to lead, design architecture, or build hands-on, let's talk.