Federico Tejedor LlorenteFederico Tejedor LlorenteFederico Tejedor LlorenteFreelance Software Engineer

AI-powered clinic management SaaS for aesthetic practices: scheduling, patients, inventory, analytics and an assistant that turns clinic data into daily recommendations.

• Worked on the product end to end — architecture, UI, data model and cloud deployment.
• Helped ship drag-and-drop scheduling, patient profiles with photo galleries, digital consent and inventory alerts.
• Helped add an AI assistant for daily insights and smart scheduling suggestions.

AI fitness platform for athletes and personal trainers: workout tracking, AI-generated routines and trainer-side client and business management.

• Helped deliver a dual-sided product covering solo athletes and coaches running a small training business.
• Worked on workout logging, progress analytics, AI routines and class scheduling.
• Helped set up a 14-day free trial flow with no card required to start.

Trainer-facing companion to GymnasTrack: client management, AI routine creation, class scheduling and business analytics for personal trainers.

• Worked on the coach dashboard for managing clients, sessions and class calendars.
• Helped ship AI-assisted routine creation and progress views for trainers.
• Contributed to the business analytics surface so coaches can track growth over time.

AI product-recommendation engine for ecommerce: personalised suggestions, cross-sell and upsell flows, plus analytics on recommendation performance.

• Worked on recommendation surfaces driven by user behaviour and related product content.
• Helped ship personalisation, performance analytics and a dashboard for merchants to review results.
• Helped design the integration so it fits existing ecommerce platforms with little friction.

AI-powered inventory and order-management platform for ecommerce operations: forecasting, fulfilment automation and ops analytics.

• Worked on inventory forecasting and stock optimisation based on sales patterns.
• Helped ship smart order fulfilment flows to speed up processing and reduce manual work.
• Helped add analytics so operators can track efficiency and inventory health over time.

Worked across the Connect and Distribution areas on both mobile and web, with a strong focus on AI integrations and event-driven services.

• Helped build the MCP server for the Eventbrite ChatGPT App, deployed with AWS CDK, and connected it to the front-end implementation.
• Worked with React Native, React, TypeScript and Python, including native iOS and Android components.
• Contributed to event-driven microservices on AWS using Lambda, Step Functions, SNS, SQS, DynamoDB and Neptune.

Worked on front-end architecture for high-traffic German apparel e-commerce platforms serving thousands of daily shoppers.

• Took part in the migration from the Next.js Pages Router to the App Router across Witt Weiden, Heine and Sieh-an, improving load times and maintainability.
• Helped reduce warning and error logs in Kibana by over 50% by resolving critical bugs and long-standing technical debt.
• Helped audit and refactor the storefront for WCAG compliance, raising Lighthouse accessibility scores.
• Helped bring the Sheego online store onto the shared platform and mentored junior developers.

Delivered user-facing features and payment infrastructure for a US education platform serving product management professionals.

• Helped migrate the payment system from Salesforce CRM to a NestJS microservices architecture with the Braintree gateway.
• Worked on secure backend APIs powering the course payments system.
• Improved learner engagement with responsive UI components and front-end performance work.
• Worked on containerised deployments with Docker across AWS and GCP environments.

Helped rebuild one of Spain's leading online pharmacy platforms and roll it out across five European markets.

• Played a key role in migrating a legacy Magento storefront to a modern React and Next.js architecture.
• Took part in shipping Mifarma Spain and Portugal, Dosfarma, Efarma and SantéDiscount.
• Helped integrate Algolia for fast, relevant search across thousands of products.
• Helped implement Contentful so non-technical teams could publish content without developer involvement.