David Emilio Sierra Puentes CV

David Emilio Sierra Puentes

Full-Stack & Automation Developer

Professional profile

Full-stack developer with 15+ years shipping production software . Specialized in systems integration , process automation , and deploying AI into business workflows . Designs , implements , and operates solutions end-to-end with autonomy and technical judgment

Work experience

Full-Stack & Automation Developer

creativa motion / freelance | January 2018 - Present (8 años 10 meses)

Used skills

Owned OSADEF product end-to-end. Built cross-platform mobile app (Angular+Capacitor). Integrated ElevenLabs chatbot via webhooks. Managed infrastructure on AWS/Cloudflare.

Major achievement

Designed architecture for Conversational AI chatbot integration. Built REST API backend with Fastify, TypeScript, Prisma. Deployed on AWS/Cloudflare. Implemented CI/CD with Github Actions.

React Developer

click contracts | September 2024 - May 2026 (1 año 8 meses)

Used skills

Developed Reports, Transactions, and Admin Dashboard modules. Designed Transactions dashboard. Led site-wide optimization and refactor. Implemented CI/CD using AWS Build and Lambda.

Major achievement

Built core production modules (React, Typescript, AWS). Led performance optimization and codebase refactor. Proposed architecture improvements and implemented CI/CD with AWS.

Full-Stack Developer

relatto media | January 2020 - January 2023 (3 años)

Used skills

Built full-stack narrative-journalism platform. Integrated PayPal and dLocal payments. Created content management and analytics systems. Automated editorial notifications.

Major achievement

Developed community publishing platform (React+Firebase) for 4,000+ users. Built CMS, analytics dashboard, and payment integrations. Automated workflows with Power Automate.

Education experience

English Certificate c1 Advanced
Ef set | Especialización

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