Sergio Sánchez Ramírez

Developed backend microservices for a travel-tech platform enabling hotels to sell flight+hotel packages directly, competing with traditional OTAs. Designed and implemented the financial settlement system handling complex commission flows between customers and hotels, including payment cycle management

with state machines and domain events.

Built a dynamic flight filtering engine to optimize search results quality with Redis synchronization for distributed rule management. Applied Clean Architecture and domain-driven design patterns with emphasis on testability, service integration, and structured logging for observability. M

Built backend features for a Customer Success SaaS platform using Django REST Framework. Integrated HubSpot CRM data via Nango synchronization layer, handling deals, contacts, companies, and pipeline stages without custom OAuth infrastructure.

Contributed to service-oriented architecture design and implemented background processing with Celery for data updates and historical backfills. Emphasis on comprehensive test coverage throughout.

Part-time engagement during overlap with other contracts.

Contracted as sole developer to maintain and evolve a Clinical Terminology Server for healthcare data standardization, during its acquisition by IQVIA. Developed new features and ensured interoperability with other applications through APIs and background tasks.

Helped align the product with IQVIA's internal standards and project requirements.

Led the hiring process for the permanent position, including candidate evaluation, onboarding, and knowledge transfer.