You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Malt Strategy
New report
Malt Tech Trends 2026
Emmanuel K.EK

Emmanuel K.

Expert Ruby on Rails | PostgreSQL | Saas

€450/day
Strasbourg, FR
8-15 years
Ruby on Rails
Fullstack Web Development
Software Craftsmanship
CI/CD
TDD

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Emmanuel

🚀 Do you want to develop a SaaS, a web application, an extranet, an API?

🔍Are you looking for a backend or fullstack web developer on Ruby on Rails?

đź“ŤYou are in the right place!


👨‍🏫 Who am I?

đź’ˇ Fullstack Ruby on Rails developer with 8 years of experience, I help companies (SMEs, startups, and large groups) design, develop, and maintain robust, high-performance, and scalable web applications.


🏛️ I have worked with large groups and successful startups:
  • Q°Emotion (Winner of EDF Pulse Grand Est)
  • Euro Protection Surveillance (CrĂ©dit Mutuel)
  • Custy (Burrus Group)
I don't just follow instructions: my expertise allows me to support you with informed advice for increasingly strategic decisions. My goal is to establish a collaboration with you based on trust and added value.

✨ My approach
As a proponent of Software Craftsmanship (TDD, Clean Code, Domain Driven Design, Clean Architecture), I design software that not only meets immediate needs but is also easy to maintain and evolve over time.



âś… I can support you from A to Z:
  • Fullstack or backend Ruby on Rails web development
  • SaaS, Backoffice, Extranet development
  • REST API design
  • Relational data modeling (Postgres, Mysql) and Document (Elasticsearch)
  • Database optimization
  • DevOps practices for faster iteration: CI/CD, Docker, Jenkins, Gitlab CI
  • Focus on quality: TDD, Clean Code, Clean Architecture, DDD
đź“© Do you have a project to realize or an application to evolve? Let's discuss it: I will quickly offer you a tailored solution and a clear action plan.
Insurance
Telecommunications
Consulting and Audits
Software Publishing

  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Strasbourg (up to 50km), Paris (up to 50km), Lille (up to 50km), Lyon (up to 50km), Marseille (up to 50km)

Experience

  • Q°emotion
    Fullstack Ruby on Rails Developer & Tech Lead
    SOFTWARE PUBLISHING
    May 2022 - August 2025 (3 years and 3 months)
    Strasbourg, France

    Customer Experience SaaS Development cxinsights.io


    cxinsights.io is a customer experience analysis and improvement solution compatible with various sources:
    • Internal sources
    • Satisfaction surveys
    • External sources: Google reviews, Trustpilot, Tripadvisor, etc...

    đź“‹ Objectives

    • Develop new features
    • Scale data acquisition and processing pipelines to support customer growth and larger data volumes
    • Update software and architecture components
    • Ensure platform operational maintenance
    • Organize the technical team: Data + Frontend + Backend

    🎯 Achievements

    âś… Customer growth +40%
    âś… Modernization and stabilization of data import pipelines. -20min on average
    âś… Development and deployment of the external verbatim acquisition API: Used byRenault, Axa, Chateauform, Floa bank ...
    âś… Rails 7.1 -> 7.2 and Ruby 2.7 -> 3.3 Updates
    âś… Migration of the Python AI & ML analysis system hosting from AWS -> GCP
    âś… Automated tests (unit, integration)
    âś… Writing technical documentation (API, Code, Design) and processes
    âś… Boosting DevOps practices by automating integrations and deployments
    âś… Fullstack integration of AI features based on LLM usage
    âś… Proactive suggestions on good design practices

    đź’» Technical Stack

    Backend:Ruby on Rails, Python, Graphql
    Frontend:React.js, Redux, Typescript
    Data:PostgreSQL, Elasticsearch, Redis, CQRS
    Infrastructure:AWS**, **GCP, Docker, Gitlab CI, Google Gemini LLM
    Monitoring:Rollbar, Cloudwatch
    Ruby on Rails Fullstack Web Development Fullstack Web Development Continuous Integration and Continuous Delivery (CI/CD)
  • Custy
    Fullstack Ruby on Rails Developer & Tech Lead
    SOFTWARE PUBLISHING
    October 2019 - May 2022 (2 years and 7 months)
    Strasbourg, France

    Online Broker Extranet SaaS Development courtier-en-ligne.com

    courtier-en-ligne is a web platform that allows brokers and their clients to exchange information related to insurance contracts:
    • Claims reporting,
    • Receipts,
    • Administrative documents,
    • Green card printing

    đź“‹ Objectives

    • CEL v3: Redesign of the user experience and optimization of processing
    • New features
    • Modernize the hosting and deployment of the solution
    • Improve the sale of the solution in White Label for various brokerage firms

    🎯 Achievements

    âś… Support for new types of claims: Unpaid Rent, Multi-risk Home
    âś… Stabilization and optimization of EDI (data transfers) between ADHOC and online broker: 30% time saving
    âś… Deployment of an online receipt payment system
    âś… Automation of deployments: smoother new client setup from 1h to 10 minutes
    âś… Infrastructure and monitoring management
    âś… Technical support for junior profiles
    âś… Hosting migration to Kubernetes

    đź’» Technical Stack

    Backend:Ruby on Rails, Sidekiq
    Frontend:VueJS, Typescript
    Data:MariaDB, Redis
    Infrastructure:Digital Ocean, Docker Compose, Kubernetes, Gitlab CI
    Monitoring:Sentry

    Ruby on Rails Vue.js Development Sidekiq Continuous Integration and Continuous Delivery (CI/CD) Tech Lead
  • Euro Protection Surveillance
    Java & DevOps Developer
    PUBLIC SAFETY
    August 2017 - October 2019 (2 years and 2 months)
    Strasbourg, France

    Main Information System Redesign Project

    đź“‹ Objectives

    • Technical supervision of business teams
    • Implementation of DevOps practices
    • In-house framework development
    • Structuring of business projects
    • Microservices architecture

    🎯 Achievements

    âś… Responsible for DevOps practices
    âś… Setup of continuous integration & continuous deployment pipelines: Automated microservice deployment -> Shorter feedback loop between development and production
    âś… Development of Java components used for microservices
    âś… Decision support on Domain Driven Design analysis tools
    âś… Tech lead of the team in charge of the subscriber area
    âś… Kafka message error management microservice
    âś… Development of developer tools: Automatic merge request validation (Bitbucket), REST interface for Apache Kafka
    âś… Code review

    đź’» Technical Stack

    Backend:Java 8, Spring Boot 2
    Frontend:JavaFX
    Data:Oracle, H2, Apache Kafka
    Infrastructure:Jenkins, Mesos/Marathon, Docker
    Monitoring:Logstash, Kibana


    Backend Development Continuous Integration and Continuous Delivery (CI/CD) Domain Driven Design Event Sourcing Spring Boot
Check out Emmanuel's experience

Recommendations

Be the first to recommend Emmanuel

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Signup to reveal

Education

  • Engineering Degree
    Université de Technologie de Belfort-Montbéliard
    2017
    Diplôme d'ingénieur
  • Computer Engineering
    African Institute of Computer Science (IAI-TOGO)
    2014
    Ingénieur des travaux informatiques

Skill set

Ruby
JavaScript Development
Backend Development
Continuous Integration and Continuous Delivery (CI/CD)
React JS
Vue.js Development
Sidekiq
Rspec
Domain Driven Design
Event Sourcing
Spring Boot
Tech Lead

Categories