Scientific computing
C++ and Python for simulation and numerical methods: Barnes-Hut N-body systems, OpenMP multithreading, and analysis of real scientific datasets.
Founder & Software EngineerAlan
Alan
Geirnaert
I build production software, and I'm working my way toward the scientific end of it: simulation, satellite data, and computational tools for planetary science. Founder of Entropy.
Based in France. Bringing EntropyHack to Edinburgh, March 2027.
- exoplanets analyzed
- 6,100+
- hackathon wins and nominations
- 4
- countries I've shipped from
- 2
01 - About
Software where engineering meets science
My background is in production full-stack software engineering, but I'm increasingly focused on scientific computing, Earth observation, simulation, and computational tools for planetary and space science. I'm the founder of Entropy, where I'm building that direction alongside an international technical community.
Earth observation and geospatial
Satellite imagery, raster pipelines, GIS tooling and environmental analysis with Sentinel data, MapLibre, and custom geospatial systems.
Production software
Full-stack production systems in Angular, Next.js, Node.js and Express, on MongoDB and PostgreSQL, with WebSockets, authentication, and typed contracts.
AI and retrieval
RAG pipelines end to end: embeddings, vector search, ranking, and source-linked answers for research-focused retrieval.
What I work with
Core
TypeScript · Angular · Next.js · Node.js
Backend
Express · FastAPI · REST · WebSockets · JWT auth · Go
Scientific
C++ · Python · OpenMP · Barnes-Hut · Numerical simulation
Geospatial
MapLibre · Sentinel-1/2 · Raster pipelines · GIS · Plotly
AI / Data
RAG · Embeddings · Vector search · Groq · Scikit-learn
Databases
MongoDB · PostgreSQL · Prisma
DevOps
Docker · GitHub Actions · Vercel · CI/CD
Testing
Jest · Vitest · Zod · Joi · Sentry
02 - Projects
Things I've built
Simulation, Earth observation, and retrieval systems built on real scientific datasets, plus a few production tools.
Best Data Visualization, Codédex 2026
Goldilocks
A scrollytelling data visualization built on the NASA Exoplanet Archive. I wrote a habitability scoring algorithm in Python that ranks 6,100+ exoplanets on several criteria, then wrapped the results in an interactive 3D story so you can actually explore them.
- Python
- Scikit-learn
- Next.js
- Three.js (GLSL)
- Data Science
EntropyCosmos
A 3D N-body gravitational simulator modeling 1,000 celestial bodies in C++ and Python, using the Barnes-Hut algorithm for O(N log N) force computation, OpenMP multithreading, and 3D trajectory visualization.
- C++
- Python
- Barnes-Hut
- OpenMP
- Pandas
Planetary Solutions for Earth
An Earth-observation mapping platform built for a Swiss environmental non-profit, layering satellite and demographic data over the Philippines. I serve custom raster tiles natively from Next.js, with 10m land cover fragmentation, Sentinel-5P nitrogen dioxide concentrations, 2020 population density, and public transport stops.
- MapLibre GL
- Raster Tiles
- Sentinel-5P
- GIS
- Next.js
Papermind
Research infrastructure for scientific literature: a search engine running a full RAG pipeline of ingestion, embedding, vector search on MongoDB Atlas, query re-ranking, and source-linked answers. Built around a research UX that emphasizes filtering, trust, and reproducibility.
- Next.js
- MongoDB
- Embeddings
- Groq AI
GitPortal
A place to put your GitHub repositories in front of people who might want to help build them. I made it because finding contributors for a side project is harder than it should be.
- Next.js
- TypeScript
- MongoDB
- Groq AI
03 - Experience
Where I've worked
Founding a company, shipping production code, and running technical programs, across France, Switzerland, and the US.
Feb 2026 - PresentNow
Founder
Entropy · France
Deep-tech company building computational systems for planetary and space science, alongside technical community infrastructure.
- Setting Entropy's technical direction: computational analysis and simulation systems for planetary and space science, plus Earth-observation tooling
- Building Entropy Earth, an Earth-observation analysis platform for disaster assessment and prevention. It is currently a candidate project in a CNES/Airbus Earth-observation innovation process
- Organising EntropyHack Edinburgh (13-14 March 2027): a 48-hour hybrid hackathon, 75 builders on-site plus an open global online track, across three tracks (Security, Impact, Explore)
- Secured Aikido Security and Red Bull as confirmed partners, with Aikido Security delivering an on-site workshop for participants
- Built and maintain the full event platform: Next.js, MongoDB, Better Auth, deployed on Vercel
Oct 2025 - PresentNow
Software Engineer
PS4E · Remote, Lucerne, Switzerland
Sole developer for a Swiss environmental non-profit building open Earth-observation tools.
- Built and maintain Planetary Solutions for Earth, a live Next.js mapping platform serving satellite-derived environmental data for the Philippines
- Implemented custom raster tile serving natively through Next.js API routes, removing the need for external tile infrastructure
- Integrated Sentinel-5P atmospheric data, 10m land cover fragmentation, population density and public transport layers over MapLibre GL
- Currently building an educational platform for Earth observation, code and satellite data
Dec 2024 - PresentNow
Full-Stack Software Developer
App'Ines · Remote, France
Production platform work on a remote, distributed French engineering team.
- Ship production features on a platform with 67,000+ registered healthcare professionals, and own them through deployment and incident follow-up
- Built a real-time messaging feature over WebSockets, from connection handling and reconnection to delivery state in the UI
- Built and deployed an internal dashboard with Angular + Ionic (Capacitor): JWT auth, role-based guards, secure token refresh, and protected routing
- Designed REST APIs in Node.js/Express/MongoDB with typed DTOs, request validation, and contracts shared across client and server, cutting runtime errors
- Refactored the frontend into reusable accessible components with route-level code splitting, improving load performance and maintainability
Nov 2025 - Jan 2026
Head of Technical Program Management
SSIP · Hybrid, Lucerne, Switzerland
Technical and program leadership across the European space innovation ecosystem.
- Led development of the official SSIP web platform (public pages, internal coordination tools for events and analytics)
- Key contributor to ActInSpace Switzerland 2026 (Lucerne), a CNES and ESA-backed hackathon, across technology, operations and program delivery
- Translated executive strategy into operational programs, platform roadmaps, and team workflows
Jul 2024 - Sep 2024
Software Engineer
Headstarter AI · Remote, USA
AI feature work in a fast-paced US remote engineering environment.
- Built AI features using RAG and embeddings for knowledge-aware responses
- Developed data pipelines and evaluation scripts; profiled latency and improved prompt consistency across environments
04 - Entropy
A deep-tech company, and the community around it
Founded in February 2026, Entropy builds computational analysis and simulation systems for planetary and space science, alongside the technical community and events that surround them.
Research and scientific systems
Computational tools spanning Earth observation, planetary analysis, simulation and scientific software.
Entropy Earth
Current focusAn Earth-observation analysis platform for disaster assessment and prevention, combining satellite imagery, geospatial layers and decision-support tooling.
Community infrastructure
The events, platforms, and tooling that get ambitious engineers into the same room. Good work tends to start with the right people talking to each other.
EntropyHack Edinburgh
Upcoming- When
- 13-14 March 2027
- Where
- Edinburgh, Scotland
- Format
- 48 hours, hybrid. 75 builders on-site, plus an open online track
- Tracks
- Security · Impact · Explore
- Partners
- Aikido Security · Red Bull
- Platform
- Next.js · MongoDB · Better Auth · Vercel
05 - Recognition
Awards and appearances
Hackathon results, mentoring and judging roles, talks I've given, and community features.
- 2026NASA Space Apps Challenge
NASA Space Apps Challenge Navigator
Selected as a 2026 Navigator, supporting participants alongside Universal Event judging and Global Judging.
- 2026NASA Space Apps Challenge - Bern
Mentor
Confirmed mentor for the Bern edition, supporting participant teams throughout the event.
- Aug 2026Codédex August Challenge
Top Candidate
Selected among the top overall LinkedIn profile revamps, with a $100 learning stipend.
- Aug 2026Baruch College TLDP
Mentor
Selected as a remote mentor for the 2026 cohort.
- Feb 2026Codédex February Challenge
Best Data Visualization
Won with Goldilocks, my scrollytelling look at 6,100+ exoplanets from the NASA Exoplanet Archive.
- Dec 2025Codédex
Learner Story #001
Featured as the first community story on the platform.
- Oct 2025NASA Space Apps Challenge - Lucerne
Speaker
Gave two talks in Lucerne on hackathons and what they have to do with space exploration.
- Aug 2025NASA Space Apps Challenge - Zurich
Webinar
Gave a webinar on how to prepare effectively for a hackathon, find the right data and turn bold ideas into working solutions in just 48 hours.
- Nov 2024NASA Space Apps Challenge - Zurich
Global Nominee
Nominated out of the Zurich event in Switzerland.
- Dec 2024Codédex Winter Hackathon
1st Place
Won first place with Back to the NASA.
06 - Contact
Get in touch
If you're working on scientific software, Earth observation, simulation, space technology, or research infrastructure, or you just want to talk about EntropyHack, I'd like to hear from you.
