Public document · clients not disclosed

Diego Andrés Molina Estren

Systems Engineer · Senior full-stack developer and DevOps

I design and build complete information systems — from the data model to production deployment — for public institutions, technology startups and companies that need to automate operations still living in spreadsheets and email.

I work alone or leading small teams, and I own the whole cycle: requirements, architecture, development, infrastructure, deployment and production support. Ten years of professional practice, six academic machine learning publications, and real experience taking systems with tens of thousands of users to production.

Backend architecture (DDD, CQRS, hexagonal) · data-driven platforms · applied AI (RAG, OCR, agents) · Web3 and blockchain infrastructure · document process automation · multi-cloud DevOps.

Recorded workstreams
21
clients and contracts
~20
clouds in production
5
Clients not disclosed
10

Work register

21 entries

The bars mark a client that is not disclosed, either under a confidentiality agreement or out of commercial discretion. They are not hidden — they are not stored. This site holds neither those clients’ names nor the detail of their systems. Verifiable references on request, directly from me.

Electoral intelligence and tally-sheet digitisation platformEight systems built to run on election day over intermittent connectivity.Presidential and congressional campaignsElectoral technologySmart wallet infrastructure and on-chain IP licensingPasskey-controlled wallets, no seed phrases.Web3 platform (United States)Web3 and blockchain infrastructureTechnical audit of operators for a regulatory authorityAn assessment with evidentiary weight before the regulator.Colombian state regulatory authorityGovTechIntegrated portal for institutional systemsA single entry point to ~30 of the institution’s applications.National Government ministryGovTechUnmanned aerial vehicle management and monitoring platformLive video synchronised with object detection over controlled airspace.Aeronautics sectorAeronauticsConfidentialAutomated financial reporting for property managementFrom a manual Excel consolidation to a platform that produces the whole report.Vesta IntegralRetail and SMEsDigital ecosystem for an international health NGOWebsite, platform, mobile app and conversational assistant across eight countries.Factor-H — Huntington’s Disease NGO across Latin AmericaHealth and non-profitMotor Ágil — data-driven application engineA single JSON file defines an entire business module.Self-initiatedOwn productAutomated legal validator for administrative actsA second pair of eyes before the signing officer commits.Regional education authorityGovTechCareer guidance platformSix configurable assessment instruments with AI-assisted interpretation.Visión Futuro ColEdTechMulti-market trading platformEquities, forex, crypto and options bridged to an institutional broker.International fintechFintechConfidentialCore application portfolio for a regulatory authorityTwelve internal systems, from document review to citizen services.Colombian state regulatory authorityGovTechCorporate document migration to cloud storageFrom a legacy document manager to managed storage.National Government ministry (science sector)GovTechReal-time location trackingWeb dashboard and native app with background tracking.Private clientRetail and SMEsConfidentialOrdering app with geographic delivery zonesOrdering, OTP verification and an operations panel.FK BurgerRetail and SMEsMulti-brand e-commerce storefrontOne codebase trunk, three storefronts in production.Tentaciones Belu · Shekinah · Jehová JirehRetail and SMEsConfigurable bill-of-materials and quoting systemDerived from a spreadsheet financial model.BrinisRetail and SMEsCMS and project archive for an events agencyA replacement for the shared Google Drive.EscenariumRetail and SMEsScholarly journal on OJS with a custom XML rendererAcademic publishing and Moodle platforms.Fundación Universidad de Antioquia — Cientificus journalEdTechPixelBar — isometric multiplayer barCustom engine, art format and protocol.Self-initiatedOwn productAI email agentExtracts action items from email and learns from corrections.Self-initiatedOwn product

Background

10 entries
  • Contractor — information systemsJan 2026 — OngoingNational Government ministry — Integrated institutional systems portal, maturity dashboard and a .NET operations platform.
  • Full-stack developerMay 2025 — OngoingWeb3 platform (United States, remote) — NestJS backend with CQRS and a passkey-controlled smart wallet architecture, plus an on-chain intellectual property licensing portal.
  • Development engineerAug 2024 — Dec 2024Special Administrative Unit (public sector) — Information systems development.
  • Lead engineer — OTSIFeb 2024 — Dec 2024National Government ministry (science sector) — Corporate document migration to cloud storage.
  • Software engineerFeb 2024 — OngoingColombian state regulatory authority — Core applications, technical audits of technology operators, and infrastructure.
  • DeveloperJan 2023 — Dec 2023MIC SYSTEM — Custom software development.
  • Developer and platform administratorOct 2022 — OngoingFundación Universidad de Antioquia — Scholarly journal on OJS with a custom XML renderer, and Moodle platforms.
  • DeveloperJan 2022 — Dec 2023RENATA — Platform development for the academic network.
  • Development coordinatorJan 2022 — Jan 2024Certika.co — Development team coordination and product architecture.
  • Support and developmentJan 2019 — Dec 2022Universidad de la Costa (CUC) — Technical support and applied machine learning research.

Academic work

6 entries
  • Sensors and Machine Learning Algorithms for Location and Posture Activity Recognition in Smart Environments2024Automatic Control and Computer Sciences
  • Semi-supervised Adaptive Method for Human Activities Recognition (HAR)2022Lecture Notes in Computer Science, Springer
  • Classification and Features Selection Method for Obesity Level Prediction2021Journal of Theoretical and Applied Information Technology
  • Correlation Analysis of Different Measurement Places of Galvanic Skin Response in Test Groups Facing Pleasant and Unpleasant Stimuli2021Sensors (MDPI)
  • Predictive model for the identification of activities of daily living (ADL) in indoor environments using classification techniques based on Machine Learning2021Procedia Computer Science
  • Bayesian Classifiers in Intrusion Detection Systems2020Lecture Notes in Computer Science, Springer

Certifications

8 entries
  • Applied Data Science Lab2025WorldQuant University
  • Inteligencia Artificial2024Universidad Distrital
  • AWS Cloud Technical Essentials2023Amazon Web Services
  • Cybersecurity Fundamentals2023IBM
  • Git y GitHub2022Platzi
  • Node.js y Express2022Platzi
  • Full Stack JavaScript2022Platzi
  • EF SET English Certificate — C1 Advanced (70/100)2020EF Standard English Test

Contact

Open to projects. Write about the problem, not the stack — the architecture comes after.

molinaestren@gmail.com