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PROFESSIONAL PROFILE

Yifan Ye Zhang

Senior Software Engineer focused on product engineering, cloud systems, TypeScript, Next.js, Node.js, and AWS.

Profile

Software Engineer with 5+ years of experience building digital products and systems used by thousands of users. I have worked on SaaS platforms, traceability systems, digital payments, document processing, ETL, internal tools, and product-centered applications.

My work spans the full product cycle: architecture, data modeling, backend, frontend, cloud infrastructure, deployment, user experience, and metrics analysis. I like working at the intersection of product, engineering, and business, turning ambiguous requirements into scalable software systems with measurable results.

Core technologies:

  • Frontend: React, Next.js, Tailwind, Material UI, shadcn/ui.
  • Backend: Node.js, Express.js, Fastify, NestJS, AdonisJS, Laravel.
  • Databases: PostgreSQL, MySQL, MongoDB, Supabase.
  • Cloud and infrastructure: AWS, GCP, Docker, Railway, Cloudflare.

I am currently going deeper into distributed systems, data-intensive applications, and user experience. I also write about engineering, product, philosophy, and technology on Substack.

Experience

SIGNE, Documentos de seguridad & Soluciones tecnologicas avanzadas

Software Engineer | September 2024 - Present | Tres Cantos, Madrid, Spain

I develop security, traceability, and document-management solutions for public and private projects.

  • Designed and developed traceability platforms for construction materials, digital recycling certificates, and financial processes.
  • Designed and implemented internal APIs for document processing, image processing, QR code generation, and barcode generation.
  • Integrated electronic signature, WORM protection, and blockchain technologies.
  • Implemented EBSI-based solutions to reinforce interoperability and security.
  • Mentored and supported intern developers.
  • Participated in technical decisions and the design of new product functionality.

Technologies: TypeScript, React, Next.js, Node.js, NestJS, Express.js, PostgreSQL, AWS, Docker.

MOGU

Software Engineer | December 2022 - May 2024 | Madrid, Spain

I developed and evolved a SaaS platform used by more than 200 travel agencies and more than 100,000 users.

  • Reduced booking-system load times by 70% through query optimization, data-model improvements, and critical-process tuning.
  • Redesigned the payments model by consolidating multiple flows into a unified architecture based on polymorphic relationships.
  • Designed and implemented ETL pipelines for large-scale data analysis.
  • Developed microservices and APIs for new product functionality.
  • Implemented serverless services for image processing and compression.
  • Designed a travel proposal builder based on editable Notion-style blocks.
  • Built cart-system functionality and extended the booking engine.
  • Built auto-generated contracts with digital signature.
  • Participated actively in architecture, data-modeling, and platform-evolution decisions.

Technologies: Laravel, Node.js, PostgreSQL, MySQL, AWS, GCP, Docker, React, Styled Components.

Encantado de Comerte

Software Engineer | September 2021 - December 2022 | Madrid, Spain

I developed and evolved a platform that managed more than EUR 2 million in GMV.

  • Developed dashboards and management tools.
  • Redesigned the coupon and credit system.
  • Optimized database queries and processes.
  • Developed metrics and reporting systems.
  • Automated data extraction and processing with Python.
  • Integrated data for analysis and visualization in Power BI.

Technologies: Vue.js, Laravel, MySQL, Python, Power BI, React Native.

4Geeks Academy Espana

Teacher Assistant and Mentor | November 2021 - September 2022 | Madrid, Spain

  • Mentored software-development students.
  • Resolved programming and architecture questions.
  • Supported and followed students during the bootcamp.
  • Developed technical communication and leadership skills.

Education

4Geeks Academy Espana

Bootcamp, Full Stack Developer | July 2021 - September 2021

Universidad Complutense de Madrid

Degree, Computer Engineering | 2017 - 2018

Universidad Rey Juan Carlos

Degree, Video Game Design and Development | 2016 - 2017

Certifications

  • Productividad Personal.
  • AWS Knowledge: Serverless.
  • Claude Code in Action.
  • Ultimate AWS Certified Developer Associate 2025 DVA-C02.

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