Sylvain Lesage

rednegra.net · severo@rednegra.net

Senior fullstack developer

Skills

Frontend: JavaScript, TypeScript, React, Svelte, Vue.js, Java, HTML, CSS, Tailwind CSS, accessibility, performance, web standards, internationalization, tests
Backend: Node.js, Next.js, Python, Java, PostgreSQL, MongoDB, Helm/Kubernetes, Terraform, AWS, Linux, Docker
Data visualization: D3.js, three.js, Observable Plot, SVG, canvas, R
Spatial data: MapLibre, GeoParquet, OpenLayers, PostGIS, GeoNetwork, GeoServer, geOrchestra, geocoding
Applied mathematics: Modeling, numerical simulation, algorithms, data structures, optimization, linear algebra, signal processing
Transverse abilities: Project management, redaction of technical standards and technological policies, animation of technical communities, teaching, state of the art studies, oral presentation, public administration, open source communities
Languages: English, French, Spanish

Professional experience

Independent software developer · since 2024

Hyperparam: development of open source React components and apps (React, TypeScript, CSS Modules, Next.js, Parquet)
Source Cooperative: development of open source React components (React, TypeScript, Next.js, OpenLayers)
FusedLabs: efficient fetching and visualization of table data and charts (hyparquet, hightable, Mosaic, DuckDB, vgplot, React, TypeScript, Next.js)
Jason Forrest Agency: migration of an interactive map from D3.js to MapLibre (D3.js, MapLibre, React)
Hugging Face: helping with the Dataset Studio on the Hugging Face Hub (Python, Node.js, Svelte)
Migreurop: development of a static website, with an interactive map of manifestations and resources on migration policies in Europe (Astro, TypeScript, Tailwind CSS, Leaflet)
Private client: preparation of a virtual machine image for geocoding Brazilian addresses with Pelias (Pelias, Docker, VirtualBox, Vagrant, Linux)
Cartes.app (volunteer): contribution to the internationalization and development of an open source Google Maps alternative (React, TypeScript, Next.js, MapLibre, Lingui, Weblate)

Software Engineer · Hugging Face · 2021-2024

Building the dataset viewer in the Hugging Face Hub, for >100k datasets. Technologies: Python, MongoDB, Node.js, Svelte, Helm/Kubernetes

Independent data visualization developer · 2018-2021

Projects on data visualization, data analysis and software development for LIRIS, Le Monde Diplomatique, MabSilico, Public Eye, Camptocamp and Purchase College. Technologies: JavaScript, Node.js, D3.js, three.js, Vue.js, Svelte, TypeScript, Java, Python, R, HTML, SVG, canvas. More details about the projects on rednegra.net.

Head of Innovation, Research and Development Unit · AGETIC · 2017-2018

Project management on public administration simplification and e-government, technical assessment and redaction of technical reports, redaction of public regulation and standardization texts, facilitation of working groups on technical standards in the Bolivian public administration. 30-40 persons team.

Head of Innovation and Development Unit, then Executive Director · ADSIB · 2014-2017

Executive Director: decision-making on strategy, finances, public administration and technical projects, executive direction of services: country-level top level domain .bo (ccTLD, DNS), and launch of the first certification authority in Bolivia (digital signing, PKI), participation to the elaboration of norms (national e-government plan and free software and open standards implementation plan), representation of ADSIB in COPLUTIC, the Bolivian national committee in charge of the public policies and strategies of the sector. 30-40 persons institution.
Head of Innovation and Development Unit: project management and technical lead, technical design and implementation of the public certification authority (PKI, digital signature), technical design and supervision of the installation works of a new datacenter.

Independent software developer · 2013

Features development and bug fixing on geOrchestra for Camptocamp. Java, JavaScript, OpenLayers, ExtJS, LDAP

Web developer · Bolivian Mission to the UN in Geneva · 2013-2014

Development of a webapp for institutional memory preservation. Support to the multilateral work of the delegations in the United Nations

Technical lead · GeoBolivia · 2011-2013

Creation, project management and technical lead of GeoBolivia, the Bolivian national spatial data infrastructure. Technical design, development and implementation. Redaction and facilitation of working groups on technical standards for GIS free software, web services and open data adoption in the Bolivian state. 10-15 persons team. geOrchestra, GeoServer, GeoNetwork, servers administration

Technical consultant · ADSIB · 2011

State of the art on Public Key Infrastructures and redaction of a report with technical recommendations (algorithms, standards, organization) for the creation of a certification authority. PKI, digital signature

Web development · Vice-presidency of the Plurinational State of Bolivia · 2010-2011

Development of the Vice-presidency website, of a web app to manage economics information and of an electoral atlas of Bolivia. Servers and networks administration. PHP, MySQL, Spip, PostgreSQL, GeoServer, OpenLayers

Web development · Bolivian Roads Administration · 2009-2010

Development of the website and intranet portal, interactive Bolivian roads map, roads traffic map, installation of a free software streaming solution for opening of envelopes transparency, servers and networks administration. HTML, CSS, Spip, PHP, MySQL, PostgreSQL, jQuery, Python, OpenLayers, Icecast, ffmpeg, GNU/Linux, vservers, Apache2, firewall, mail, DNS

Linux digital TV developer · SipRadius · 2009

Add IP frames encapsulation in DVB frames to dvbnet Linux library (C, Wireshark). Server administration.

Scientific Computing Engineer · Acsystème · 2007-2009

Development with Matlab, Simulink and C++. Teaching on Matlab. Projects:

car industry: simulation of a shock absorbers system, minimization of escape pollution, detection of wheel rotation direction from sensor signals
power plant: data visualization, simulation and optimization of the electricity production
food industry: computer vision and automatic classification of fish species, simulation and optimization of fish cans filling
battery: simulation to specify motor and battery characteristics in a electric bicycle design.

Software developer · Kerlink · 2007

Development of a Linux driver for Cirrus CS42L51 audio codec (C, cross-compilation).

R&D transfer · IRISA · 2006-2007

Simulation of a speakers separation method using Matlab, for the European project PELOPS, to analyze multisensor audio streams for the automatic transcription of sport events

Teaching · University of Rennes 1 · 2003-2006

Teaching assistant in mathematics (support and functional analysis) and computer science (C, Matlab)

Teaching

Military School of Engineering · 2018: "Relational databases security" course in Master in Information Technologies Security. PostgreSQL
Catholic University of Bolivia · 2015: "Digital signal processing" semester course for Telecommunication and Mechatronics degrees
Higher University of San Andrés · 2012: Free software for spatial data course in the Master in FLOSS. git, QGis, OpenLayers, GeoServer, PostGIS
University of Rennes 1 · 2003-2006: Teaching assistant in mathematics (functional analysis, support classes) and computer science (C++, Matlab)

Education

PhD in Telecommunications and Signal Processing · University of Rennes 1 · 2007

Engineering degree in Signal Processing ("Signal, Images, Forms") · Supélec · 2003

Master in Applied Mathematics · University of Metz · 2003