Serguei Cambour

Senior Software Engineer

📍 Based in Belgium

About Me

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, FedNot, Infrabel, Johnson&Johnson, SNCF, Decathlon, and Sodexo. Known for rapid onboarding, ownership of complex systems, and delivery in high-stakes environments. Currently extending concurrency and distributed-systems expertise into Elixir/Phoenix.

Technical Skills

Java EE Spring MVC Spring Boot Tapestry Ruby Ruby on Rails Elixir Phoenix Ecto JRuby Cucumber RSpec Capybara Tailwind CSS JPA/Hibernate GraphQL/Absinthe Maven Ember JS Docker Kubernetes Git/GitLab/GitHub/Bitbucket

Work Experience

Senior Software Engineer

self-employed - freelance role

October 2025 - present

Contributing to open source projects and working on personal projects using Java, Elixir and Phoenix.

Senior Consultant/Engineer

Capgemini Engineering, Brussels, Belgium

February 2021 - June 2025

I'm involved in different projects and primarily working on client sites in Communications, Financial, Retail and Transport Services.

Senior Software Engineer

Devoteam, Brussels, Belgium

February 2020 - February 2021

I'm involved in different projects and primarily working on client sites in Communications, Financial, Retail and Transport Services.

Senior Software Engineer

INETUM (former GFI Informatique), Lille, France

January 2014 - January 2020

I'm involved in different projects and primarily working on client sites in Communications, Financial, Retail and Transport Services.

Ruby on Rails Engineer

Teleborder, USA

Oct.2013 - Feb. 2014

Migration to Rails 4, fix compatibilities issues

Ruby on Rails Engineer

Silicon Salad, Lille, France

Oct.2013 - Jan.2014

WEB agency specialized in e-commerce solutions.
I'm involved in evaluating and support of existing Rails applications.

Software Engineer

Atos Integration, France

June 2010 - June 2013

A range of technical roles, primarily working on client sites in Financial, Retail, Transport Services.

Software Engineer

Aubay.Promotic, Belgium

March 2007 - March 2010

A range of technical roles, primarily working on client sites in Retail, Transport Services, Public and State Institutions.

Featured Projects

Kliniq

Medical appointment SaaS, built with Phoenix, LiveView, Oban and Elixir

View Project →

Decastore API

Decathlon back-office API (Rails)

View Project →

Budgie

Budgie is a simple and elegant budgeting app built with Elixir and Phoenix.

View Project →

Slax

Phoenix app, clone of Slack application

View Project →

UMed

Quiz for students in medicine (Rails)

View Project →

Heads Up

Phoenix Web application

View Project →

Users API

Phoenix API with GraphQL

View Project →

Education

Master of Engineering

Computer Sciences and Information Technology

Kuban State University, Krasnodar, Russia

1991

StackOverflow

Additional Information

JVM: I am experienced in a variety of Java API’s and frameworks. I have recently worked with Spring, JPA (Hibernate) in addition to others.

Web Development: My server side web development experience has largely been based on the Ruby on Rails, Phoenix and Spring MVC frameworks. But I'm doing my best to learn more Elixir and Phoenix. I have also worked with some client side technology, having used Ember JS, Tailwind CSS, Bootstrap, Foundation, LESS, SASS and have also experimented with other technologies such as Angular, Backbone, CoffeeScript.

Development Control: I have a good knowledge of application life-cycle management and have worked with GitLab, GitHub, Bitbucket, CVS, SVN, Maven, Sonar, Jira and Jenkins. I have experience with lots of testing tools and technologies.

I have also gained experience and knowledge from several side projects and research that I have undertaken in my free time, including Amazon S3, PayPal.

I created, and am now primary contributor to a Rails quiz application for students in medicine: UMed, which provides integration with PayPal API and Amazon S3.