Carlos Gude

- Raised PHPStan on the core platform from level 5 to 9, cutting the baseline from 3,339 to 239 errors (−93%).
- Recovered a test suite that no longer ran and grew it to 2,100+ passing tests.
- Modularised the core: extracted IAM and access control, split 127 migrations across modules and removed 53,000 lines of dead code across three repositories without breaking CI.
- Built the Holded (cloud ERP

- Led the migration of a legacy system from PHP 7.4 / Symfony 4 to PHP 8.3 / Symfony 6 without service disruption.
- Rewrote authentication on Symfony's native Security Component, addressing vulnerabilities in the previous model.
- Designed external integrations and coordinated a gradual migration with technical and business teams.

- Designed and implemented 5+ travel integrations, including Booking.com, Iberia, Lleego and Hostalia.
- Built a contract-based architecture that decoupled API clients from the business domain.
- Developed a multi-provider integration layer where new providers plug in without changes to the core.
- Turned different provider API behaviours into consistent, maintainable components for the team.
- Co

- Built integrations with external providers for a travel platform.
- Defined common contracts that kept each provider’s API details separate from business logic.
- Laid the foundation for an architecture that made it easier to add providers without changing the application core.
- Continued this work at Quadrant TravelTech after joining the company directly.

- Built integrations with more than 10 partner APIs for a last-mile logistics platform.
- Worked on real-time shipment tracking and coordination across multiple carriers.
- Designed the event and messaging system that processed over 300,000 messages per minute for rider location updates alone.
- Addressed concurrency and data consistency challenges to keep that information reliable at scale.

- Built the integration between Drupal, Symfony and Vue for Metro Bilbao’s passenger information systems.
- Implemented the processing of route and timetable data to keep passenger information up to date.
- Worked on a service used by passengers every day, where continuous availability was essential.

- Solo end-to-end build of a Twitch-style live-streaming platform: real-time chat, video streaming, payments, a virtual economy and moderation tools.
- Owned the full delivery: architecture, backend development, technical decisions and release.
- Learned and applied the streaming and real-time messaging technologies the project required.

- Developed real-time systems to ingest and process maritime telemetry across vessel fleets.
- Worked with high volumes of sensor data and variable network connectivity.
- Implemented ordered, lossless messaging so no events were lost or reordered during processing.

- Led the development of a configurable e-commerce SaaS platform for multiple clients.
- Defined the architecture and built product features, including payment integrations.
- Owned the technical roadmap, development decisions and production releases.
- Evolved the platform as its sole technical owner.

- Designed and developed custom web applications for clients across different sectors.
- Took responsibility for backend development, technical decisions and delivery.

- Developed features for a hotel booking platform.
- Maintained and improved the backend supporting the booking process.
- Resolved issues and contributed to the ongoing development of the product.

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