Resume

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Hello, I am Florent Caspar

Enthusiastic software engineer with master's degree in Computer Science and Engineering and 2 years of professional experience in software engineering across fintech and adtech. Dedicated to constantly designing, improving and delivering the best innovations. Proficient in C#, Rust, Python, Java, C and C++. Working as a software engineer, mainly on the Supply-Side Platform (SSP), at Criteo.

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Mail:

casparflorent@gmail.com

Phone number:

+33 6 52 80 71 15

Linkedin:

Florent Caspar

Location:

54000 Nancy, France

Driving license:

Current clean driver license

My specialities

Software engineering

Requirements, design, development, testing and maintenance.

Oriented-object programming illustration

Object-oriented programming

Programming in compliance with the principles of OOP.

My skills

Programming languages • C#, Rust, Python, Java, C, C++ (proficient), Scala, JavaScript, TypeScript (familiar)

Frameworks • .NET, .NET Core, Json.NET (C#), Serde, Diesel, Warp (Rust); JavaFX (Java); Qt (C++)

Databases • PostgreSQL, Redis, Presto, Firebase

Tools • Grafana, Kibana, Git, CyberChef, LaTeX

Fields • Software engineering, OOP, API development, databases, automation, networks, project management, data scraping

Soft skills • Teamwork, sociable, responsible, proactive, autonomous, open minded

Languages • French (native), English (professional), German (limited)

My career

Fields
Programming languages
Databases
Frameworks / Libraries
Tools

Work experience

Software engineering C# Scala Presto .NET .NET Core JSON.NET Grafana Kibana Git
Software Development Engineer
Permanent contract Criteo - Paris, France Since September 19, 2022
- Scoped, planned and supervised 2 innovative products launched in coordination with 9 other teams, by owning publisher integration script and supply endpoint topics, actively participating in offline and online discussions with the stakeholders and troubleshooting on publishers websites and internally.
- Grew off-site targeting revenue by accelerating the offsite audience awareness from ~50 hours to 3-12 hours far exceeding the 24-hour target, by reporting methods to speed up the export process, detecting changes and triggering intermediate audience exports, optimizing Spark jobs, removing dependencies, decoupling workflows and running them in parallel.
- Led the overhaul and improvement of Supply-Side Platform (SSP) observability with new SLAs and key metrics, instant-load Grafana boards, re-architecting and refactoring existing metrics, refining Kibana logs with custom tags and catching noisy errors.
- Saved infrastructure costs and reduced traffic latency by decommissioning the legacy SSP after migrating and improving functionalities and tests from age-old Scala code to C#. Rolled-out the migration of 88% of all traffic, anticipating potential problems through rigorous validation of analog processing using progressive traffic replay.
- Analysed complex .NET dumps with another team, as application availability could drop to 40% at times, by identifying a recurring snowball effect causing 64% of our application instances worldwide to crash simultaneously.
- Streamlined the maintenance of the SSP by reducing the code for declaring models by ~70%, leading the initiative and conducting a study over 6 methods, then converting all verbose model declarations.
Key achievement: Received 22 recognitions from coworkers.
Software engineering API development Databases Rust PostgreSQL Serde Diesel Warp Git
REST API development and integration
Work-study contract SUN ZU Lab - Paris, France September 13, 2021 - August 31, 2022
- Standardized and catalogued all financial instruments and assets collected by the company on crypto exchanges by building a referential RESTful API from scratch in Rust after identifying, pooling and documenting common characteristics.
- Automated tracking of over 28,000 instruments and 2,100 assets by plugging the referential over WebSocket and REST APIs on more than 30 crypto exchanges.
- Accelerated response time by up to 3500%, by benchmarking and optimizing (joins, indexes) the designed PostgreSQL database and adding a hundred combinable server-side filters.
- Designed a Single Sign-On (SSO) server compatible with the OpenID Connect / OAuth 2.0 protocols.
Key achievement: Created from A to Z a key product of the company.
Software engineering Rust Serde Git
Realization of financial flows collection systems
Intership SUN ZU Lab - Paris, France May 31, 2021 - August 31, 2021
- Increased data collection uptime by developing a Rust tool to merge several market event flows into a single output flow.
- Expanded the number of collected instruments by 39% with over 2,400 new instruments by building flow collection systems in Rust over WebSocket and REST APIs on 3 crypto exchanges.
Key achievement: Immersion in a startup resulting in a work-study contract.
Shelf stacker
Intership real GmbH - Saarbrücken, Germany June 29, 2020 - August 1, 2020
- Shelved with the Food team in charge of about 20 shelves.
- Learned about and experimented the difficulties of blue-collar jobs.
- Answered from 2 to 10 customer questions a day in German.
Key achievement: Immersion in a company abroad resulting in a job offer despite language difficulties.
Automation IoT Python
Video transmission experiments on IoT-LAB
Intership Research Centre for Automatic Control - Nancy, France April 29, 2019 - June 15, 2019
- Automated video transmission experiments on sensor networks with 3 Python scripts.
- Merged up to 15 tasks in a single command by introducing a centralized terminal, windowless simulation and 20 options for experiments carried out on Cooja simulator.
- Merged up to 27 tasks in a single command by introducing up to 17 options for experiments carried out on the European IoT-LAB very large scale testbed.
- Retrieved and displayed 6 different measurement metrics.
Key achievement: Took initiative and exceeded expectations.

Education

M.Sc.Eng. Computer Science and Engineering (CSE) (CGPA: 3.726)
Télécom Nancy (French ‘Grande École’) - Nancy, France From 2019 to 2022 - Graduated on November 26, 2022
- Specialization in cybersecurity.
- Relevant courses: Shell, C, Java, Android, OOP, design patterns, system modeling, networks, systems, databases, data structures, applied maths, cryptography, project management.
- Won 2nd individual place out of 30 at the 4th edition of the Capture The Flag organized by TELECOM Nancy.
Intensive two-year course for the nationwide competitive entrance to the French ‘Grandes Écoles’
La Prépa des INP - Nancy, France From 2017 to 2019
- Specialization in mechanics, electrical engineering, electronics, automation and industrial computing.
- Relevant courses: maths, physics, computer science.

Charity work

Events manager
CETEN (student office) - Nancy, France January 1, 2021 - December 31, 2021
- Organized a dozen events while respecting the sanitary protocols in place.
- Active participation in the associative life of the school with 3 weekly meetings.
- Created logos, pins, posters, slideshows and a typography on Illustrator and Photoshop.
Vice-president
Regional office of engineering students of Nancy - Nancy, France Since december 5, 2020
- Connected together over 40 elected students of 11 engineering schools of Nancy and Metz.
- Set up training courses for elected students, student offices or those involved in associations.
Safety assistant
Anim'Est - Nancy, France 2019 Convention
- Ensured safety in one of the largest and oldest French convention of Japanese culture who welcomed more than 7,800 people over a weekend by rearranging queues, patrolling and reporting incidents.
- Assisted the logistics to set up the event by coming early to move furniture and supplies.