Senior Developer - Python FastAPI / Angular - Freelance (M/F)

France | Sept. 22, 2026

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Company: Collective.work

Country: France

Type: Remote

Employment: Full-time

Description: *

   Long-term mission (project several years)

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   2 days of remote per week

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   Paris 15th

As part of the continuation and modernization of several products in service of our client, we are looking for a Senior Developer to join a team of 5 developers, coordinated by a Team Leader and occasionally accompanied by a transversal Tech Lead.

You will work on 2 products each with a defined roadmap for the coming year, with strong challenges around:

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   modernization of applications;

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   improvement of code quality;

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   correction of security issues;

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   decoupling with the historical information system;

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   carrying out the developments planned throughout the year.

A dominant back-end Python / FastAPI, with intervention on the front-end

The position is distributed approximately 70% on the back-end and 30% on the front-end.

You will therefore mainly work on Python / FastAPI developments, while taking charge of front-end subjects in Angular.

Proficiency Python and particularly FastAPI is an essential prerequisite for the position. The candidate must be sufficiently autonomous on this stack to design, develop, evolve and maintain the back-end APIs and services of the products.

The objective is to have a truly full-stack profile with a predominantly back-end focus, with solid Python/FastAPI expertise and an ability to intervene on the Angular front-end.

Your missions

As a Senior Developer, you will be required to:

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  Analyze and technically design the subjects of evolution, modernization and decoupling of historical IS;

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   Develop mainly on the back-end in Python / FastAPI, which represents around 70% of the activity;

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   Design, develop and evolve REST APIs with Python and FastAPI;

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   Work on the Angular front-end (around 30 % of activity), particularly on developments and integration with back-end services;

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   Contribute directly to the team's velocity and the creation of the roadmap;

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   Investigate complex technical issues, identify the causes and implement appropriate solutions;

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   Participate in the recovery and reliability of data;

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   Develop and integrate tests at all levels: unit tests, integration tests and automated tests;

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   Participate in the continuous improvement of the quality of code, architecture and CI/CD;

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   Contribute to the monitoring and improvement of quality and security through the tools used by the team: Gitleaks, Sonar, Trivy, Cypress, as well as internal AI-assisted tools;

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   Participate in peer reviews and share your practices and expertise with other members of the team;

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   Be a force for proposals on technical choices, architectural developments and application modernization topics.

You have a minimum of 8 to 10 years of experience in software development, with significant experience in environments full-stack.

ESSENTIAL TECHNICAL SKILLS

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   Python: senior level / excellent mastery;

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   FastAPI: essential mastery and concrete experience in API development;

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   Angular: good knowledge and ability to intervene on front-end developments

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   Experience in design and development of REST API;

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   Mastery of unit and integration testing practices;

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   Strong sensitivity to code quality, security and maintainability issues;

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   Experience in CI/CD environments.

Knowledge of tools such as Gitleaks, Sonar, Trivy or Cypress is a plus.

Beyond your technical expertise, you are capable of evolving independently on complex subjects and

Apply here:

Web: Apply here

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