I build software for start-ups and businesses, and I measure what policy actually does.
I run two ventures. Zero2Hero teaches students across Latin America, the United States and Spain — programming, Python, web development, machine learning, AI. BlankSoftware is where we practise what we preach: custom-made software for start-ups and businesses, and products of our own.
In parallel I work as a mathematician and economist, on the limits of growth, sustainable systems and policy evaluation.
Zero2Hero teaches people to build. BlankSoftware builds — for clients, and for ourselves.
We teach students across Latin America, the United States and Spain: programming, Python, web development, machine learning and AI. More than a thousand of them so far. Courses run live and asynchronously, and are built around work students can actually ship.
zero2hero.com.mxWhere we practise what we preach. We build custom-made software for start-ups and businesses, and we build products and solutions of our own — from the first conversation through to the server it runs on.
github.com/blankhall98Limits of growth, sustainable systems and policy evaluation — what growth costs the systems it depends on, and whether a policy actually did what it set out to do.
A long-run evaluation of Mexico's conditional cash transfer programme: whether decades of transfers moved the socio-economic outcomes they were designed to move.
Privatisation across key Latin American industries in three countries, separating the short-run effects from what actually persisted.
Whether the seventeen Sustainable Development Goals can be met without breaching the nine planetary boundaries — and what has to give if they cannot. Published as a public platform so the sources and reasoning stay available.
Projects I started, led or built. Client names appear with permission.
Course and mentoring platform: catalogue, enrolments, subscriptions and payments.
zero2hero.com.mxSelf-hosted platform running every application I own or maintain — six live apps, two of them taking payments.
A WhatsApp sales agent with a CRM behind it: orders, payment links, shipping, escalation to a human.
Website and backend for ANRO.
Website for DEWA.
Pixel-perfect responsive website, built in Next.js.
Front end and backend for the Clínica de Valle project.
Front-end implementation for Auma Tierra.
Natural-language analysis of psychology sessions, for clinicians between appointments.
Tasting-experience platform: scheduling, ticketing and idempotent Stripe checkout.
Practice site for a cardiologist specialising in cardiovascular imaging.
doctordanielsierra.comStatistical inference, stochastic processes, time series analysis, Bayesian statistics, dynamical systems, differential equations
Difference-in-differences, instrumental variables, synthetic control, panel data and fixed effects, causal inference, impact evaluation
Regression and classification, forecasting, natural language processing, LLM applications and agents, LangChain, local LLMs, scikit-learn, TensorFlow
Python, R, SQL, JavaScript and TypeScript, HTML and CSS, Git
Flask, FastAPI, SQLModel, SQLAlchemy, React and Next.js, PostgreSQL, Docker, Dokku, self-hosted Linux servers
Any of these reaches me. I answer as soon as I can.