Freelancer profile translated to English.

Description

🎯 Backend Developer | Software & Cloud Architect | DevOps-Ready

With over 5 years of experience in backend development, I specialize in designing robust, scalable, and Cloud-oriented software architectures – primarily on AWS.

My strength: a complete approach, from software design to automated deployment in infrastructure as code.

🛠️ My key expertise:

Multi-language Backend Development: Java, Node.js, Golang

Cloud & Serverless Architecture (AWS): design, scalability, security

Infrastructure as Code: CDK, CloudFormation, Terraform

Creation of reproducible environments: Nix, Docker, Packer

DevOps Approach: CI/CD, automation, reliability, and performance

💡 My goal? To help you build solid systems, well-thought-out from the ground up, maintainable, and aligned with technical and business challenges.

Do you have a complex project, a need for structuring, or do you want to gain technical maturity? Let's discuss it!

Languages

English
Fluent
French
Native or bilingual
Arabic
Fluent
Kabyle
Native or bilingual

Workplace preferences

Can work on-site

Paris (up to 50km), Paris (up to 10km)

Eviden
Lead Developper
CONSULTING AND AUDITS
October 2023 - Today (2 years and 8 months)
Paris, France
Lead Java Developer – Robust and secure architecture for file integration

Design and development of a batch file integration project with a “robust by design” architecture. Automatic synchronization from SFTP and AWS S3, secure processing via PGP encryption. Integration with external APIs via Resilience4j (rate limiting, retry, circuit breaker).

Implementation of a queuing and idempotent processing system, with automatic recovery after failure or container restart via Spring Integration. Two REST APIs: one for third-party services, the other for an Angular front end dedicated to real-time batch management and monitoring. Structured file archiving and complete traceability.

Key technologies: Java, Spring Boot, Spring Integration, Resilience4j, AWS, Docker, PostgreSQL, QueryDSL, TestContainers.
Spring boot Java AWS Docker Spring Integration TeamCity Testcontainers QueryDSL PostgreSQL
Edifixio
Experienced AWS Devops
CONSULTING AND AUDITS
January 2023 - November 2023 (10 months)
Paris, France
AWS DevOps Mission – Migration and optimization of deployment processes

As part of a DevOps mission, I assisted a tech team in modernizing its AWS infrastructure.
My intervention focused in particular on:

The redesign of the deployment process, moving from classic CloudFormation templates to a more dynamic infrastructure as code with AWS CDK (TypeScript).

Implementing a Blue/Green deployment strategy, reducing downtime and increasing the reliability of production releases.

Full integration with GitLab CI, via automated pipelines for build, test, deployment, and rollback phases.
AWS CDK Amazon Web Services Gitlab CI
Edifixio
Junior AWS Architect
CONSULTING AND AUDITS
December 2021 - June 2023 (1 year and 6 months)
Paris, France
Architect / Backend Developer – Precision nutrition application in serverless architecture

Design and development of a personalized nutrition application, based on a serverless and event-driven architecture. Deployment of a secure backend API, developed in Python, hosted on AWS Lambda and exposed via API Gateway.

Implementation of an automated nutritional calculation pipeline, orchestrated by AWS EventBridge and Lambda, with event distribution via SNS/SQS. Complete infrastructure automation with AWS CDK pipelines, ensuring reliable and reproducible deployments.

Data storage on DynamoDB, optimized for low-latency access and event streams. Architecture designed for scalability, resilience, and a small operational footprint.

Key technologies: Python, AWS Lambda, API Gateway, CDK, EventBridge, SNS, SQS, DynamoDB.
Python AWS CDK Amazon Web Services Serverless AWS Lambda DynamoDB Docker AWS Fargate AWS EventBridge Event-driven architecture

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Master of Computer Science
Sorbonne University
Master en Sciences et Technologies des logiciels spécialisé dans le développement d'applications robustes et efficaces utilisants les dernières technologies en développement et modélisation

Karim Leffad

Junior Web/Mobile Developer

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