Adrien Horgnies

Interbank messaging between financial institutions in 205 countries.

• Develop and maintain the Java and Spring Boot platform behind eight Swift products: transaction management, instant payments gateway, Alliance Cloud messaging, data and analytics, event monitoring, infrastructure as code. Every microservice gets its packaging, encryption, observability and resilience from it.
• Designed and built the network outage detection of the platform with Java, Spring and Kafka.
• Wrote a Maven plugin and its website that collect the failures of the 2,200 tests across builds. About a hundred tests were flaky: race conditions between Kafka producers, consumers and processors. Rewrote them with exact assertions, correct thread synchronisation, distinct inputs and isolation. The suite went from 80 % passing in sequence to 100 % in parallel.
• Cut the release from three days to three hours with four Maven plugins, twenty goals. They cut the release branches and tags, build the Helm charts and container images, and publish the audit reports on tests, dependencies, properties and observability events to Confluence.
• The Helm plugin renders a chart from test values and compares it with the expected output, takes dependencies from Maven or Helm repositories, interpolates Maven properties, and publishes to a Helm repository, a Maven repository or an OCI registry.
• Migrated the platform from Java 8 to 17, then 21, and from Spring Boot 2 to 3, then 4, with the base image upgrades. The support branches stayed releasable throughout.
• Designed the Jenkins pipelines that build, test, release and deploy to OpenShift: retries, cancellation of outdated builds, Coverity and Nexus IQ scans as quality gates.
• Coached five newcomers. Planned their work with the product manager, wrote and prioritised their tasks, and fixed their working methods when their productivity was questioned.

Stack: Java 8 to 21, Spring Boot 4, WebFlux, Spring Data JPA, Spring Security OAuth2, Kafka and Kafka Streams, Flyway, Oracle, Micrometer, Prometheus, Zipkin, JUnit 5, Mockito, Testcontainers, Maven, Jenkins, Helm, Docker, OpenShift, Nexus

Open source ERP: accounting, sales, CRM, inventory, websites.

• Developed the accounting and payment modules in the in-house Python framework. Added the accounting localisations of Israel, Italy and Sweden.
• Fixed the performance issues clients reported: algorithmic complexity, SQL query plans, prefetching of web components, cache hit rates, unhandled exceptions.

Stack: Python, PostgreSQL, SQL, JavaScript

Online language learning platform, used by Erasmus+ and Wallangues.

• Developed the REST APIs of the Spring Boot backend. Integrated the authentication infrastructures of clients into the Spring Security chain.
• Migrated every language course from XML to many small JSON documents for the new site, with Spring Batch.
• Wrote a tool that finds inconsistencies in the database. Fixed them in the live database of five million users.
• Built the import engine and web service that load client Excel files into the database. It validates the data and sends the salesperson one report of every error, grouped by kind. One import onboarded 600,000 Brazilian citizens.
• Wrote the Node.js generator of new microservices following company conventions. Improved the MySQL schema, checked migrations with Python and Matplotlib, built reusable Angular components.

Stack: Java 8, Spring Boot, Spring Batch, Spring Security, MySQL, Angular, Node.js