Luis Calderón

Fullstack developer. I turn what a client needs into software that works.

Four years building SaaS products in production, almost always around data: biodiversity platforms, systems for public institutions, internal tools. At Datasketch since 2022.

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Projects

Seventeen projects, between the ones I built on my own and the ones I worked on with the team at Datasketch. Starting with the five that best show what I can do.

Santander 2050

Prosantander · Fedesarrollo · 2026 · Full-stack development

It is the largest project I have built almost entirely on my own. The hard part was not the size but that it kept changing shape while it was being built: what counted as a mission, what counted as an indicator and how they related to each other were redefined several times. The data model had to absorb that without forcing me to rewrite the application each time. Having built Biodiversity in Figures first taught me where a screen that tries to show everything breaks.

Next.js
TypeScript
Drizzle ORM
Turso
Tailwind CSS

Biodiversity in Figures

Instituto Humboldt · SiB Colombia · 2023 · Full-stack development

The project I am proudest of. It shows species data from Colombia, a country where nature is not a minor subject, and in practice it is a way in for the Spanish-speaking world to see what we have. Technically it was the hardest thing I have built: a lot of information on a single screen, with subpages and contexts that changed between sections. I came out of it a better developer, and it shows in what I did afterwards.

Next.js
Visualización de datos
Tailwind CSS

National Federation of Departments

Federación Nacional de Departamentos · 2022 · Full-stack development

It came after Biodiversity in Figures and it was where I applied what I had learned there. I worked full-stack, from the data model to what the user sees, for an organization that answers to all 32 departments in the country.

Next.js
Tailwind CSS
Strapi

ORCA

Programa Anticontrabando · 2022 · Full-stack development

I came in on the front end, making a dashboard readable when it crosses seizures, control visits and business closures from across the country. There the challenge was not drawing the charts but keeping the dashboard responsive once someone starts filtering. Then the project grew in another direction: all the editorial content was hardcoded, so I built the admin panel that let the team change the pages, the allies and the publications without opening the repository. That was the point where it stopped being a site I maintained and became one they maintain.

Next.js
Visualización de datos
Strapi
Tailwind CSS

Datasketch Blog

Datasketch · 2025 · Full-stack development

Astro was the decision that paid off most. Pages come out static and load almost instantly, yet the visualizations stay interactive where it matters, which is usually the exact point where you end up choosing between speed and interaction. The other thing that changed day to day was the CMS: people stopped writing to me to ask for a one-line text change.

Astro
React
D3.js
Decap CMS
Tailwind CSS

Other projects

The rest of what I have built or contributed to.

Experience

I started in industrial systems and ended up on the web. Having worked with hardware and sensors still helps me think about how data moves.

Feb 2022 – Present

Fullstack Developer

Datasketch

I designed the architecture of the company SaaS applications with RedwoodJS, Prisma and PostgreSQL, and I am the technical reference for data model decisions and GraphQL API structure. I migrated legacy architectures to Next.js and Astro, and built microservices in FastAPI and Fastify. I work directly with clients and with design and research teams, turning what they ask for into technical requirements.

RedwoodJS
Prisma
PostgreSQL
GraphQL
Next.js
Astro
FastAPI
Fastify
Docker
AWS

Oct 2021 – Jan 2022

Junior Java Developer

CREANGEL Ltda.

I built the backup module of the Ifindit system end to end, with dynamic interfaces and server-side logic in Servlets and JSP. I integrated and configured Apache Solr to improve search and indexing across customer information.

Java
JSP
Servlets
Apache Solr

Jun – Oct 2021

Industrial Systems Developer

Industrial Automation & Informatics

I deployed MQTT on AWS to communicate in real time with sensors on the plant floor. I shipped an application that counted rebar automatically and cut inventory control times. I audited and optimized MySQL databases so queries stopped being the bottleneck.

MQTT
AWS IoT Core
MySQL

Tools

I work mostly on the server side: data model, APIs and deployment. On the frontend I move around React and the frameworks built on top of it. I do not collect technologies; these are the ones I use often enough to answer for them.

Backend: Node.js, Fastify, Express, RedwoodJS, Python, FastAPI, Java
Frontend: TypeScript, React, Next.js, Astro, Tailwind CSS
Data: PostgreSQL, MySQL, Prisma, TypeORM, GraphQL, REST
Infrastructure: AWS, Docker, Git, Jest, MQTT, Apache Solr

About me

I am from Agustín Codazzi, in the department of Cesar, and I live in Duitama, Boyacá.

I went into Electronic Engineering because as a kid I wanted to know how things worked inside, and because I thought that was the way to build robots. It was not. But programming courses showed up along the way and I stayed there: watching code turn into something that works felt like reason enough to change direction.

I care about open data reaching someone who can actually use it. Having the data does not count for much if nobody sees the information inside it, and closing that gap is more or less what I do every day.

Lately I have been drawn to modeling systems at scale: replicas, load balancing, content distribution. I have not worked on anything that size yet, but that is where I want to go.

Away from the computer I ride my bike in the mornings. In the afternoons I am usually with my wife, eating somewhere, watching a series, or driving to some small town we have not seen before.

Let us talk

I am open to new opportunities. Email is the fastest way to reach me; I usually reply the same day.

luis2fcalderon@gmail.com