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Denis Crespe

@deniscrespe

Software engineer at Techvalley / Atos who built UGAP.fr’s cleaning-services offering and REST microservices.

At Techvalley / Atos, I built the cleaning-services offering for UGAP.fr, with a Vue.js front end and Java Spring Boot back end. I designed RESTful microservices from an OpenAPI 3.0 specification.

At Insoft Design / Ausy, I rewrote GlobalJet’s defect-ridden Node.js fuel-price job in Rust, reducing its runtime from 7 minutes to 5 seconds, and shipped it in Docker. I also worked on ESB architecture and REST services for the aircraft-charter business.

At Insoft Design / Banking & Public Sector, I worked on Java services for CACEIS and Clearstream, and optimized Informix SQL for the Chamber of Deputies in Luxembourg. At Checkfree Solutions, I built an Oracle reconciliation model with 45 reports and 23 PL/SQL procedures, and optimized a CACEIS routine from 12 hours to 4 hours 30 minutes.

I’ve worked on business-critical systems across banking, aviation, insurance and the public sector. I also designed, built and shipped Klyrio end to end as a live production service.

Experience

Work history, roles, and key accomplishments

Software Engineer

Techvalley / Atos

Nov 2022 - Apr 2026 (3 years 5 months)

Built the cleaning-services offering for UGAP.fr with a Vue.js front end and Java Spring Boot back end. Designed RESTful microservices on a hexagonal architecture from an OpenAPI 3.0 specification.

Java Spring Boot Vue.Js TypeScript Microservices Hexagonal Architecture Rancher

Senior Java Developer

Insoft Design / Ausy

Oct 2017 - Mar 2022 (4 years 5 months)

Worked on GlobalJet ESB architecture with ActiveMQ and Java for XML exchange, REST services, and MariaDB migration. Rewrote a Node.js fuel-price job in Rust, reducing runtime from 7 minutes to 5 seconds.

Java Rust Spring Boot Spring Cloud ActiveMQ JMS MariaDB Docker

Senior Java Developer

Insoft Design / Banking & Public Sector

Aug 2013 - Sep 2017 (4 years 1 month)

Developed Java REST web services for CACEIS, JMS services for Clearstream, and optimized SQL for the Chamber of Deputies. Diagnosed C/C++ defects in the IBSY banking application.

Java JMS AWS Docker Kubernetes Informix Hibernate Ehcache Jenkins C C++

Java Developer

Checkfree Solutions

Nov 2004 - Jul 2013 (8 years 8 months)

Built enterprise content-management solutions for KBL and reconciliation models for Accurate NXG. Optimized PL/SQL routines for CACEIS, reducing runtime from 12 hours to 4.5 hours.

Pl SQL Java JEE IBM MQ Websphere BASH

Java / Oracle Developer

International Technology Integration Ltd

May 2001 - Sep 2004 (3 years 4 months)

Developed UML models and web-service flows for Silverlake Life Insurance. Reverse-engineered legacy databases for BC Ministry of Forests and defined new data models.

Java Oracle Pl SQL JBoss AXI SOAP UML

Software Engineer

ABC Arbitrage SA

Jun 1995 - Mar 2001 (5 years 9 months)

Designed Oracle databases for market-activity management and built Visual C++ data-entry interfaces. Established programming standards and led knowledge-sharing sessions.

Visual C++DCOM Oracle