Serguei Cambour
Software Engineer Java | Ruby | Elixir
Salary / Daily rate
Tournai, Belgium
Mobility: Lille, Brussels, ...
Freelance
Remote only
Skills
Languages
About me
Intro
Senior Software Engineer and contractor with 20+ years of experience modernizing enterprise platforms for telecom, banking, rail, retail, and public-sector organizations. Specialized in transforming legacy monoliths into scalable, cloud-ready micro-services using Java/Spring and modern DevOps practices. Proven delivery record with Tier-1 clients including Proximus, Johnson & Johnson, SNCF , Decathlon, FedNot, and Sodexo. Known for rapid onboarding, ownership of complex systems.
Work experience
Java Software Engineer
Food IT Solutions Via CBTW — Belgium - Senior Software Engineer (Freelance Contractor)Freelance
Oct 2025 - Mar 2026
6 months
Remote
Leading migration of a mission-critical ERP from Ant/Tapestry monolith to Java 21 microservices architecture. Stabilized build and release processes by replacing legacy tooling with Maven-based pipelines. Designed REST APIs enabling progressive decoupling and future system integrations. Acting as senior technical reference for legacy system understanding and modernization strategy.
Senior Consultant/Engineer
Capgemini Engineering
Feb 2021 - Jun 2025
4 years 5 months
Brussels Metropolitan Area · Hybrid
Delivered enterprise backend systems for Proximus, Johnson & Johnson, FedNot, and Sodexo. Modernized and extended large-scale service platforms handling technical orders and appointment workflows. Designed and implemented secure document-sharing platform used nationwide by Belgian notaries. Integrated OAuth2/OIDC authentication including itsme, ensuring compliance and high security standards. Deployed cloud-native applications using Docker and Kubernetes on GCP and OpenShift. Regularly onboarded to complex client environments with minimal ramp-up time.
Senior Software Engineer
Devoteam
Feb 2020 - Mar 2021
1 year 2 months
Brussels Metropolitan Area
Improved platform reliability by introducing automated testing and CI/CD pipelines. Migrated legacy SVN repositories to GitLab, improving collaboration and delivery speed. Delivered passwordless authentication solutions using NextAuth and modern security practices.
Software Engineer
Gfi Informatique
Jan 2015 - Mar 2020
5 years 3 months
Mexico City, CDMX, Mexico
Designed and delivered APIs and microservices for large retail platforms (Decathlon). Built Rails-based backend services with Ember.js frontends serving thousands of daily users. Implemented OAuth2/JWT authentication and role-based authorization models. Worked in Agile teams delivering continuous improvements to production systems.
Software Engineer
AIRIAL
Jan 2014 - Jan 2015
1 year 1 month
Mexico City, CDMX, Mexico
Java EE development
Ruby on Rails Developer
Teleborder
Nov 2013 - Mar 2014
5 months
Belgium, WI, USA
Migration a Rails application to Rails 4.
Ruby on Rails Developer
Silicon Salad
Aug 2013 - Oct 2013
3 months
Mexico City, CDMX, Mexico
E-commerce with Ruby on Rails
Experienced Consultant
Alten Belgium
May 2013 - Jul 2013
3 months
Brussels, Belgium
No mission, nothing at all that would match my profile during 2 months of the trial period. So they have just got rid of me. That was the biggest mistake in my career...
Developer Java EE
Atos
Jun 2010 - May 2013
3 years
Seclin, France
Participation in development of different projects on Java EE
Software Engineer
Aubay.Promotic SA
Mar 2007 - May 2010
3 years 3 months
Brussels Metropolitan Area
Participation in development of different projects
Java developer
Evadix.NET
Jan 2006 - Jan 2007
1 year 1 month
Tournai, Belgium
java programming
Education
Learn-Elixir.dev
2023 - 2024
9 months
Kuban State University
Master's degree
1986 - 1991
5 years 1 month