Yassine Mouttalib
Yassine Mouttalib
Senior Backend Software Engineer · Java / Spring Paris, France · Freelance & CDI · On-site in Île-de-France

Software Platforms · APIs · Automation

I build software
that works in production.

Backend-focused development for new products and existing systems — from architecture and integrations to deployment.

Discuss a project About me & experience

Services

What you can hire me for.

01

Backend development

New services, APIs, data models and backend features for new or existing products.

02

Modernization & migration

Java and Spring upgrades, dependency modernization, version migrations and technical cleanup.

03

Performance & reliability

Profiling, bottleneck analysis, recurring bugs, unstable services and production issues.

04

Integrations & automation

External systems, APIs, message flows and focused automation where it provides clear value.

How I can help

New build or existing system.

  1. 01Build new backend services
  2. 02Modernize Java / Spring
  3. 03Migrate to newer Java versions
  4. 04Improve performance
  5. 05Fix reliability issues
  6. 06Integrate external systems
  7. 07Improve tests & code quality
  8. 08Strengthen delivery & deployment

Track record

Selected companies.

Wolters Kluwer Capgemini / EDF CGI / Efluid

Engagement options

Full day
€500/day
Half day
From €300
6+ months
Flexible around €485/day
Fixed-price project
Quote after scope
About me Experience, projects and technical background Open profile

About me

Backend-focused software engineer with 7 years of experience.

My core expertise is backend engineering with Java and Spring, plus APIs, databases, Docker and CI/CD. I use Next.js and TypeScript on personal products; for frontend-heavy client work, I can work with a trusted frontend specialist.

Selected projects

Products I build outside client work.

01

Multi-tenant marketplace

25+ Spring Boot services covering orders, payments, billing, tax, shipping, commissions and cash on delivery.

Java 21 · Spring Boot · React · Next.js · PostgreSQL · Docker
02

Project management platform

Kanban boards, collaborative wiki, role-based permissions, REST APIs and real-time dashboards.

Java · Spring Boot · Next.js · TypeScript · PostgreSQL
03

AI-assisted code editor

Multi-window editor with integrated terminal, symbol indexing, tool execution and AI-assisted development workflows.

AI integration · MCP · developer tooling

Professional background

Selected experience.

Senior Java Software Engineer · Wolters Kluwer

Java/Spring feature development, bug fixing, performance optimisation, unit testing, code reviews and code-quality improvements.

Java Engineer · CGI / Efluid

Built a message-processing proof of concept from scratch with dynamic routing using Apache Camel and Spring Boot.

PLM Consultant / Tech Lead · Capgemini / EDF

3DEXPERIENCE customisations, widgets, MQL extensions, data modelling, code reviews, onboarding and Jenkins-based continuous integration.

Software Engineer · Capgemini Aerospace

Feature development and bug fixing on aerospace applications in a Scrum delivery environment.

Contact

Tell me about the problem.

Share the context, current situation and what you need. I’ll reply directly.