Personal Information
Name
Lylian SIFFRE
Email
lylian@siff.re
Github
https://github.com/xonturis
LinkedIn
https://www.linkedin.com/in/lylian-siffre
ORCID
https://orcid.org/0009-0004-5743-9337
Education
PhD in Computer Science (ongoing)
IMT Atlantique (Nov. 2024 - Nov. 2027)
Supervisor: Thomas Ledoux
Summary: Since the topic evolves during the thesis, for now, refer to publications/preprints/posters.
Engineer’s Degree in Computer Science
Polytech Nantes, Université de Nantes (Sept. 2021 - Sept. 2024)
Topics: Advanced database management, data quality, data analysis, AI algorithms.
Associate Degree in Computer Science
IUT de Nantes, Université de Nantes (Sept. 2019 - June 2021)
Topics: Web development (HTML/CSS/JS & PHP), technical solution design (UML), project management, databases, Java, Python, C, statistics, linear algebra.
High School Diploma – STI2D (SIN specialization)
Lycée Gustave Eiffel de Bordeaux (June 2019)
With Highest Honors (Mention Très Bien).
Professional Experience
PhD Student
Kapela, Nantes (Nov. 2024 - Nov. 2027)
- Study of Local-First Software’s impact on green software design
- Scientific outreach to industry professionals
- Research valorization with industrial partners
Research Engineer (Apprenticeship)
Impakt, Nantes (Sept. 2021 – Sept. 2024)
- Authored and published a research paper at a European conference (see Publications).
- Developed energy measurement software (see Publications).
- Designed and compared efficiency between eco-designed and non-eco-designed prototypes.
Backend Developer Intern
ValueChecker, Stockholm, Sweden (June 2023 - Aug. 2023)
- REST standardization of an HTTP API.
- Identified and corrected non-compliant issues.
- Communicated changes to the team.
- Wrote documentation to maintain REST compliance.
- SQL query optimization.
- API testing and CI/CD integration.
- Participated in recruitment processes.
Computer Developer Intern
LS2N, Nantes (Apr. 2021 – June 2021)
- Data warehouse management.
- SQL database extraction.
- Data quality reporting.
- Team workflow methodology implementation.
R&D Activities
Demeter: An architecture for long-term monitoring of software power consumption
ECSA23 - Industrial Track - International peer-reviewed conference proceedings (Sept. 2023)
Collaboration with Université de Pau et des Pays de l’Adour and CINCHEO.
Other Activities
Board Member
Communication committee member for a French nonprofit (1901 law) (2024 – ongoing).
Vice President & Treasurer
Financial management for a nonprofit (2020 – 2021).
Minecraft Game Server Project Lead
(Agile team management, developer recruitment, inter-team coordination, Java development, database/server administration) (2018 - 2021).
IUT Projects:
- Logic gate game in HTML/CSS (no JS): 🌐
- Go messaging program: 🌐
- Java game “Le neutron”: 🌐
- PHP 2048: 🌐
Technical Skills
- Data Analysis: Numpy, Pandas, Matplotlib, scikit-learn, Tableau, Excel
- Design: UML, Entity-Relationship
- Programming: Python, Java, Go, JavaScript, PHP, C, C++
- Web Frameworks: React, Vue
- Languages: Native French, English (TOEIC 965/990, 2022)
- Documentation: LaTeX, Word
Publications
Siffre, L., Ledoux, T., Pawlak, R., & Guery, J. (2025). Local-First Software for Green IT. In ICT4S 2025 - International Conference on Information and Communications Technology for Sustainability (pp. 1-10). https://hal.science/hal-05037019v1
Siffre, L., Breuil, G., Noureddine, A., & Pawlak, R. (2023). Demeter: An Architecture for Long-Term Monitoring of Software Power Consumption. In ECSA 2023 - 17th European Conference on Software Architecture. https://hal.science/hal-04231337v1
Teaching
- Introduction to programming, Programming project, IMT Atlantique (1st-year Engineering students, 2025)
- Introduction to Research, IMT Atlantique (3rd-year Engineering students, 2025). With Hélène Coullon
- Object-Oriented Programming, Databases & Networks Project, IMT Atlantique (1st-year Engineering students, 2025)
- Object-Oriented Programming, IMT Atlantique (1st-year Engineering students, 2025)
Mentorship
- Supervised a 2nd-year engineering intern at Stack, LS2N (Jan–Feb 2025).
Output: https://gitlab.inria.fr/lsiffre/service-energy-monitor - Supervised a group of three 3rd-year engineering students at IMT Atlantique for a Frontend/Backend project. (October - ongoing)
Output: ongoing
Preprints
None at the time, come back later :)
Organization
- Stack Team Seminar 2025:
- Program
- Session Chair
Posters
Lylian Siffre. 2025. Local-First Software for Green IT. Greendays 2025, Rennes. https://siff.re/public/Position_Paper_Poster.pdf