Professional Profile¶

Goal-driven professional with an illustrated track record of innovation in high quality software development, complex systems modeling, cloud-based architecture for high-traffic servers and services.
17 years of experience in Backend Java development, relational database design and usage, 3 years in Python, with skills in infrastructure, CI/CD, software engineering and security, machine learning, and production.
Proven leader recognized for strong technical acumen, as well as dynamic problem-solving, communication, interpersonal, analytical, and decision-making skills.

Competencies¶

Technical Design ▪ Domain Driven Design ▪ Business Rules Analysis ▪ Stakeholder Engagement ▪ Hands-on technical leadership ▪ Research & Development ▪ Quality Assurance ▪ Production Troubleshooting ▪ Performance Optimization (SQL, CPU/Mem, Cross-Service) ▪ Open Source Mindset

Career¶

Machine Learning Engineer¶

SonarSource ▪ Annecy, France ▪ 2023 - 2024

Collaborated closely with SonarSource's Machine Learning (ML) scientists, providing integral technical support to 4 research initiatives, and interfacing with Product owners and developers in multiple teams.

Achievements

Oriented 2 ML research studies, ensuring embedding computation and model compatibility with future operationalization constraints on SonarCloud, SonarQube, and SonarLint.
Coded, in plain Java, the RoBERTA tokenizer and a Logistic Regression model, matching precisely the reference Python implementation (Scikit-learn + Hugging Face), to run across all SonarSource products.
Designed and implemented with AWS Step Functions the workload producing model-training data, scaling EC2 instances to scan hundreds of projects within 30 minutes, with secured and autonomous control for scientists.
Cleansed, visualized, and feature engineered the produced data, with Jupiter Notebooks, Pandas, and Seaborn

Technical Assets

AWS (CDK, EC2, Step Functions, S3, IAM, System Manager), Python3, Poetry, Jupiter, Numpy, Pandas, Seaborn, Java 11, Bash, Makefile

Application Architect & Cloud Platform Engineer¶

SonarSource ▪ Annecy, France ▪ 2022 - 2023

Provided design support and advice on application and cloud-based architecture to the 4 delivery squads of the SonarCloud team (35 people).
Handled research projects, and joined squads' sprints as a Cloud Platform Engineer.

SonarCloud is SAAS with 1.3B+ API requests and a million server-side jobs per week, with a 6TB-storage relational database.

Achievements

Reviewed Architecture design on up to 6 specifications a month, during weekly specification review team meetings or as participant in the specification phase of squads' sprints.
Designed and coded the weekly AWS CodeBuild job sanitizing tables (up to 1.5B rows, 1TB) in a AWS Aurora Postgresql snapshot, optimizing DDL and SQL queries to ensure reliable completion within the 8 hours timeout, secure customer data, and enable developers to work on production-like data.
Researched and optimized SQL queries to clean orphans in a 3.5B rows table for a daily, reentrant, and interruptable job, running on the writer node in production with no impact to users.
Participated in SonarCloud community support and backlog processing, focusing on cloud-based Security risks and costly in time/arduous threads and issues.

Technical Assets

AWS (CDK, CodeBuild, Aurora, RDS, ECS, SNS, SQS, Step Functions, Lambda, VPC, API Gateway, ELB, WAF), AWS CDK, Python3, Postgresql, SQL, Bash, Makefile

Application Architect¶

SonarSource ▪ Annecy, France ▪ 2021 - 2022

Lead the modelling of SonarCloud as domains, following Domain-Driven Design (DDD) methodologies to ensure future-proof boundaries and definitions, and prepared the refactoring from a monolith to a microservice-based architecture.

Achievements

Formed a modeling task force of squad- and skill-representing members, organizing DDD training with an external vendor, and managing part-time work with workshops and asynchronous tools.
Incrementally modeled SonarCloud as 3 core and 9 other domains, building up a model with 1k+ events representing 100+ processes within the service.
Evangelized the model to the 4 delivery squads, sharing modelling updates, organizing workshops, writing up DDD reference documentation, and publishing 23 notes solving squads' modelling problems.
Led a team restructure (in a Reverse Conway Manoeuvre) around the defined domains and achieved clearer, smaller-scoped, and better scaling responsibilities, as well as balanced work and community support sharing among squads.

Assets

Domain Driven Design, Event Storming

Cross-Team Senior Software Engineer¶

SonarSource ▪ Annecy, France ▪ 2020-2021

Lead projects and research unfit for the critical path of product delivery and/or crossing team boundaries.
Delivered Proof-of-Concepts and research for product teams ahead of feature development, engineering consultations and design support to developers, and company-wide expertise on relational databases, and Elasticsearch.

Achievements

Prescribed the company's policy for Artifacts Management, directed the teams' Release Software Engineers, and achieved consistent and secure management of software artifacts.
Formed the Release Engineering Team (a support team bringing common tooling around CI/CD), contributing as the initial leader, and as an individual contributor to the build and CI/CD tooling.
Fixed and optimized Elasticsearch search and indexing requests, redesigned indices and requests to accommodate breaking changes from version upgrades, for both SonarCloud and SonarQube.
Concluded on the company impact of the 2021 Elastic license change, collaborating with the Legal Team.
Designed and prototyped the asynchronous indexing of data into Elasticsearch, achieving reduction of SonarQube upgrade downtime from hours to constant max 30 minutes, and constant under 1 hour SonarCloud Time To Recovery.
Researched and prescribed the solution to ensure JWT tokens expiry on SonarCloud, fixing Session Hijacking risks, and enabling targeted or global revocation in case of Security incident.

Technical Assets

Java 11, Elasticsearch, Maven, Gradle, Bash, GitHub actions, Cirrus CI, Travis CI, Postgresql, SQL

Backend Software Engineer¶

SonarSource ▪ Annecy area, France ▪ 2015 - 2020

Operated as a Backend Developer on the founding product of the company (SonarQube) during the startup and growth phases of the business, designing, implementing, optimizing, and troubleshooting new features and improvements.
Engaged in development of webservice APIs, a task processor, relational databases, multi-threading, and Elasticsearch embedding as well as production support, security, engineering best practices, software build, open source, and hiring.

SonarQube is a Java-based server with clients for build and CI/CD systems, and supports 4 DBMS vendors.
On-premises deployments range from a few MB to hundreds of GB and handle a few to thousands of users.

Achievements

Designed and coded a generic task processor, a task framework and the task processing reports from clients, enabling the removal of database connections from clients and achieving tenfold scalability improvement.
Honed expertise in troubleshooting and fixing performance issues with both the JVM memory flow and SQL queries, achieving Out-Of-Memory-Error-free processing and reliable performance regardless of report size and content.
Developed the automatic lifecycle management of SonarQube instances working together as a cluster, over a Hazelcast network, and achieved high availability.
Designed and coded a Java-based, SQL-free database migration framework, ensuring transparent support of and automated testing on 4 DBMS, and consistent and performant behavior across versions and developers.
Added 5 people to the team, as first hiring manager, screening resumes, conducting first and technical interviews.
Invented and implemented public-git-sync, synchronizing private repositories with their open source counterparts, providing automated creation of clean and consistent Git history and content, with branches and tags support.

Technical Assets

Java 1.4 to 11, Elasticsearch, Hazelcast, Tomcat, Maven, Gradle, Junit, Mockito, MyBatis, PicoContainer, Bash, Jenkins, Cirrus CI, Postgresql, Mysql, MariaDB, Oracle, SQL Server, Git, Jira

Senior Developer¶

Ekino ▪ Paris, France ▪ 2014 - 2015

Revamped from PHP to JAVA the B2B frontend of the digital safe solution of the French postal office (Digiposte), along with deep Spring MVC customization, Thymeleaf integration, and SQL optimization.
Supervised and mentored two junior developers, and successfully brought them to autonomy within the team.
Maintained and improved Java-based jobs and their Puppet/Capistrano configuration, and achieved enhanced reliability and security of both execution and deployments.

Technical Assets

Java 7, Spring Core/Mvc/Batch, MyBatis, MySQL, LiquiBase, Puppet, Capistrano, Logstash, Graylog2, RabbitMQ, Guava, Mockito, TestNG, Maven, Git, Jenkins, Tomcat, Apache, Linux, bash

Senior Developer & Technical Supervisor¶

Fullsix ▪ Paris, France ▪ 2010 - 2014

Provided technical supervision of SFR's (2nd Telco in France) Flex application for customer service and shops, and B2C website.
Appointed for a year to the four-person on-call Support Level 3 team for all web-frontended applications of SFR.

Achievements

Prescribed and implemented continuous integration, quality assurance, source control, release management, and product owner engagement to successfully handle up to 3 concurrent versions of the software.
Conducted code reviews and provided technical mentoring to 6 to 12 developers.
Reliably integrated with 80+ internal Web Services and conducted nightly production deployments up to twice a week on a multi-site cluster.

Technical Assets

Java 7, Spring, GraniteDS, Oracle, CXF, JMS, ActiveMQ, LiquiBase, Guava, Mockito, TestNG, Maven, Git, Tomcat, Apache, Linux, Jenkins, Sonar, bash

Developer¶

Ginerativ ▪ Paris, France ▪ 2004 - 2010

Created corporate website and backend system for a Contract Generation product, in a 3 developers startup legal company, based on deep-tree-structured data sorted in Oracle DBMS.
Directed offshore applications development in Tunisia, providing specification and conducting compliance reviews.
Designed and coded a desktop application with multi-threading and dynamic UI for jurists to easily test their work.

Technical Assets

Java 5, EJB3, Oracle, PL/SQL, JDBC, XML, JAX-WS, Struts, JSP, Maven, multi-threading, Swing, SVN, JBoss, Apache

Presentations¶

(2021) Organized and prepared the internal presentation at SonarSource by engineers from Malt sharing their experience: 8 years searching for the best observability stack
(2017) Internal presentation at SonarSource: Do you know Climbing?
(2016) Internal presentation at SonarSource: Functional Programing in Java with Guava 12's FluentIterable and Optional
(2015) Devoxx France – hands-on lab - Compile-time annotation processing: @Nailed("it")

Education¶

Master of Engineering in Computer Software Development ▪ ESIEA ▪ Paris, France
BSc in Computer Software Development (First Class Honours) ▪ Anglia Polytechnic University ▪ Chelmsford, UK
High School Graduate with Mathematics, Biology, and Technical Majors ▪ Notre Dame la Riche ▪ Tours, France

Certifications¶

AWS Certified Solutions Architect – Associate
AWS Certified Solutions Architect – Practitioner

Interests¶

I climb twice a week indoors (boulder and lead) and make the best of mountain outdoors: alpine and Nordic skying in the winter, running, hiking, climbing, and swimming in lakes the rest of the year.
I set up and maintain my home data protection strategy with rsync, Bash and Python, achieving redundancy and encryption across devices in the household. Recovered with no impact from home breaking in 2021.
I enjoy sharing with my family outdoor activities, my collection of over 500 European comics and mangas, video games, movies, and my eclectic music taste.