PYTHON DEVELOPER SENIOR

Vivadax; Brussel; Hybride; EUR 67 000 - 100 000; Plein temps

Résumé du poste

Vivadax in Belgium is seeking a Senior Freelance Python Developer to design, develop, and optimize scalable Python-based applications and systems. You will lead backend services, APIs, automation scripts, and data processing pipelines, collaborating with cross-functional teams to deliver robust software.

This 1-year contract role requires strong leadership, experience with Django/Flask/FastAPI, RESTful APIs, and cloud integration.

Qualifications

• 5+ years as a Python developer with 3+ years in a senior role.
• Strong experience with RESTful APIs, GraphQL, and microservices.
• Proficient in Django, Flask, or FastAPI and async programming.
• Experience with Docker, Kubernetes, and CI/CD practices.

Responsabilités

• Design, develop, and maintain scalable backend applications using Python.
• Build and optimize RESTful APIs, GraphQL services, and microservices.
• Implement authentication, authorization, and security best practices.
• Lead architecture and design of new features aligned with business goals.
• Mentor junior developers and guide architectural decisions.

Connaissances

Python

Backend development

Leadership

RESTful APIs

GraphQL

Microservices

Asynchronous programming

Performance optimization

Cloud integration

DevOps practices

Mentoring

English

French or Dutch

Docker

Kubernetes

CI/CD

Jira

Trello

Git

Outils

Docker

Kubernetes

CI/CD pipelines

Django

Flask

FastAPI

Jira

Trello

Git

Description du poste

Job Title: Freelance Senior Python Developer (1-Year Contract)

Location: Belgium (Hybrid: 3 days on-site, 2 days remote)

Employment Type: Freelancer

Contract Duration: 1 year

About the Role

We are seeking a Senior Freelance Python Developer to design, develop, and optimize scalable, efficient, and high-performance Python-based applications and systems. In this role, you will lead the development of backend services, APIs, automation scripts, and data processing pipelines, while collaborating with cross-functional teams to deliver robust, maintainable software solutions.

Key Responsibilities

• Design, develop, and maintain scalable backend applications using Python and frameworks like Django, Flask, or FastAPI.
• Build and optimize RESTful APIs, GraphQL services, and microservices for seamless integration with frontend and third-party systems.
• Implement authentication, authorization, and security best practices (e.g., OAuth2, JWT, encryption, and role-based access control).
• Optimize application performance, scalability, and reliability through efficient code, database design, and caching (Redis, Memcached).
• Collaborate with frontend developers, data engineers, and DevOps teams to deliver end-to-end solutions.
• Lead the architecture and design of new features and systems, ensuring alignment with business and technical goals.
• Write clean, maintainable, and well-documented code following best practices (PEP 8, SOLID principles).
• Implement automated testing (unit, integration, E2E) using frameworks like pytest or unittest, and set up CI/CD pipelines.
• Work with popular Python libraries for web development (Django REST Framework, FastAPI), data processing (Pandas, NumPy), async programming (asyncio, Celery), and cloud integration (Boto3, Azure SDK).
• Mentor junior developers and provide technical guidance on complex challenges.
• Stay up-to-date with emerging Python libraries, tools, and industry trends to recommend innovative solutions.

Ideal Candidate Profile

Experience

• 5+ years of experience as a Python Developer, Backend Engineer, or similar role, with 3+ years in a senior or leadership capacity.
• Expertise in Python and its frameworks (Django, Flask, FastAPI, or similar).
• Strong background in RESTful APIs, GraphQL, and microservices architecture.
• Experience with SQL and NoSQL databases.
• Proficiency in asynchronous programming (asyncio, Celery) and performance optimization.
• Hands-on experience with popular Python libraries for web development, data processing, testing, and cloud integration.
• Experience with DevOps practices (Docker, Kubernetes, CI/CD pipelines) is a plus.
• Knowledge of cloud platforms (AWS, Azure, GCP) and serverless architectures is a strong plus.
• Experience with Agile/Scrum methodologies and project management tools (Jira, Trello).

Languages

• Fluent in English (required for collaboration).
• Fluent in French or Dutch (required for client/stakeholder communication).

Soft Skills

• Strong leadership and team collaboration skills.
• Excellent communication and stakeholder management skills.
• Problem-solving and innovation mindset.
• Ability to mentor junior developers and guide architectural decisions.

Requirements

• Currently residing in Belgium (we cannot assist with work permits).
• Fluency in English + French or Dutch (mandatory).