App and adaptive website to track and manage crime scene evidences

• The Spanish Guardia Civil needed a secure and reliable way to register crime scenes, track evidence, and guarantee the chain of custody from the moment evidence is collected until it is presented in court.

• Transform paper workflow into a digital solution.

• Reduce cognitive load at the crime scene so users can focus on the investigation, while the system enforces traceability, integrity, and legal compliance in the background.

• Evidence registered through the platform is legally admissible.

Product Owner and Project Manager.

Define the problem context

• The existing workflow used paper forms and manual signatures, which posed risks to accuracy, traceability, and legal reliability.

• The key risk wasn’t purely technical — judicial acceptance of digital records was paramount.

Mapping requirements

• Worked with stakeholders to define the workflow and understand each step of the investigation to better adapt the solution.

• Studied how evidence is evaluated and accepted in Spanish and European court systems.

• Worked with expert lawyers to research legal precedents and regulations around digital evidence and custody tracking.

• Worked to translate blockchain guarantees (immutability, traceability) into legally meaningful terms.

Legal discovery over typical UX research

• Focused on understanding the legal perspective: how judges, prosecutors, and the Ministry of Justice view evidence integrity and record admissibility.

• Engaged legal specialists to validate that the technology will hold up under judicial scrutiny.

Implement and deliver the platform

• Built a web portal and mobile app for on-site evidence capture and tracking. The app had an offline mode so investigators can work in remote location without network signal.

• Integrated a blockchain-based history trail that is auditable and tamper-resistant.

• Ensured complete traceability of every piece of evidence from scene to court.

The following next steps were:

• Integration with external laboratories and providers.

• Integration with Ministry of Justice.

• Improvement of custody workflow, adding new actors.

I came up with possible next steps for the project:

• Use of AI to identify elements in images.

• Integrate an AI agent to support the users during investigation.

• Use of AI to manage material and agents availability.

This project taught me that in mission-critical public systems, trust, legality, and clarity matter more than features, and that product management often means bridging technology, law, and real-world human behavior.

It was also the first time I was working with blockchain and managing a project of that scale.