Freelancer profile translated to English.

Description

About

Fullstack developer with over 8 years of experience, I am a co-founder of Fragments Studio, a Parisian studio specializing in web, mobile, and AI integration development.

I support our clients end-to-end, from scoping to production, with a human dimension at the heart of my approach: a dedicated contact person, transparent communication, and real long-term follow-up. I work on both scratch projects and as support for existing technical teams.

What you gain from working with me:

Less friction:I integrate quickly, ask the right questions from the start, and deliver without surprises

A senior perspective on your codebase:Technical debt, performance, architecture, I diagnose and propose

Real business understanding:Used to working with business and product profiles, I take the time to understand your challenges before writing the first line of code

What I do:

- Fullstack development React / Next.js / NestJS / Node.js

- Mobile applications React Native / Expo

- Codebase takeover, bug fixing, functional enhancements

- Senior team support, rapid integration into an existing context

- Technical architecture, code review, lead dev

- DevOps: AWS, Docker, GitHub Actions, CI/CD

Main Stack:

React · TypeScript · NestJS · Node.js · PostgreSQL · React Native · Expo · AWS · Docker

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Paris (up to 20km)

Fragments Studio
Co-founder
SOFTWARE PUBLISHING
April 2024 - Today (2 years and 4 months)
Paris, France
► Business Development & Strategy

Identifying and qualifying client opportunities (web, mobile, SaaS, AI)
Technical scoping and project costing
Writing commercial proposals and managing sales cycles
Building and evolving the studio's offering (positioning, pricing, services)

► Architecture & Technical Direction

Designing technical architectures for client projects (full stack, cloud, AI)
Selecting stacks and patterns based on business and budget constraints
Ensuring delivery quality: code review, standards, documentation
Active technological watch (generative AI, agents, automation, MCP)

► Delivery & Coordination

End-to-end project management (scoping → production)
Coordination among the 4 partners based on mobilized expertise
Client relationship management: progress updates, decision-making, acceptance testing

► Automation & AI Integration

Designing and deploying automated workflows (n8n, API, LLM)
Integrating generative AI into existing products or new projects
Developing MCP servers to connect business systems with AI agents

► Stack & Tools

Front: React, TypeScript
Back: NestJS, Node.js, PostgreSQL, Redis
Mobile: React Native / Expo
AI: Claude API, OpenAI, n8n, RAG, embeddings
Infra: Docker, AWS, GitHub Actions
Tools: Figma, Notion, Linear, Postman
React.js TypeScript NestJS React Native Expo
SMARTRENTING
Lead Developer
REAL ESTATE
September 2022 - April 2024 (1 year and 7 months)
Paris, France
► Product - Tech - Business Relations
- Brainstorming, specification, and prioritization of new features or projects with the Product Owner
- Reporting to the founders (CEO & CSO)
- Exporting and providing data exports (Metabase)

► Development:
- Feature development
- Maintenance and bug fixing of existing code
- Automated testing (unit/E2E)
- Optimizations (time & performance)
- Integration of APIs and external services
- Technology watch and technical debt management

► Management of a team of 4 developers:
- Recruitment
- Documentation and training for team members
- Mentoring, peer coding, code reviews
- Sprint planning and tracking

► DevOps:
- AWS infrastructure management
- Release management
- Technology watch, evolution, and monitoring of CI/CD (Github Actions, AWS pipelines & services)
- Security (monitoring, WAF configuration, alerting)

► Technical Stack:
- Front: React, TypeScript, MUI, Storybook
- Back: NestJS, TypeScript, Typeorm, PostgreSQL, Redis
- Infra: Docker, Github Actions, AWS (Pipelines, ECR, EC2, ECS, S3, SQS…)
- Tests: Jest, Playwright, Supertest
- Tools: Bull Monitor, Metabase, Insomnia, Figma, Notion…
NestJS TypeScript React.js Amazon Web Services PostgreSQL
SMARTRENTING
Fullstack Developer
REAL ESTATE
October 2019 - September 2022 (2 years and 11 months)
Paris, France
► Development:
- Feature development
- Maintenance and bug fixing of existing code
- Automated testing (unit/E2E)
- Integration of APIs and external services
- Technology watch and technical debt management

► Technical Stack:
- Front: React, Javascript, MUI, Storybook
- Back: ExpressJS, Javascript, Sequelize, PostgreSQL
- Tests: Jest, Supertest
- Tools: Insomnia, Figma
React.js PostgreSQL NestJS Amazon Web Services Jest

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Master's Degree in Computer Science, Big Data, and Connected Objects
ESILV - Graduate School of Engineering Léonard de Vinci
2019
Diplôme d'Ingénieur, Informatique, Big Data et Objets Connectés
Bachelor of Science (BSc)
University of Brighton
2016
Bachelor of Science (BSc)

Check out Karim's education

Karim Baali

Fullstack Developer | React · NestJS

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