Senior Python Developer (Flask)

About us: Talent has no borders. Proxify's mission is to connect top developers around the world with opportunities they deserve. So, it doesn't matter where you are; we are here to help you fast-track your independent career in the right direction. Since our launch, Proxify's developers have successfully worked with 1200+ happy clients to build their products and growth features. 5000+ talented developers trust Proxify and its network to fulfill their dreams and objectives. Proxify is shaped by a global network of supportive, talented developers interested in remote full-time jobs. Our Glassdoor (4.5/5) and Trustpilot (4.8/5) ratings reflect the trust developers place in us and our commitment to our members' success. The Role: We are looking for a Senior Python Developer with deep expertise in Flask on behalf of one of our high-growth clients to design, maintain, and scale their web applications and backend systems. In this role, you will take ownership of modular Flask architectures, building lightweight, robust APIs and maintaining core business logic across production environments. You are a perfect candidate if you are growth-oriented, you love what you do, and you enjoy working on new ideas to develop exciting products. What we re looking for: • 3+ years of hands-on production experience building, securing, and scaling web applications using Flask and modern Python (3.10+). Deep understanding of WSGI/ASGI servers (Gunicorn, uWSGI), Flask application factories, blueprints, and context managers. • 5+ years of software engineering experience building enterprise backend systems, design patterns, and RESTful web services. • Expert knowledge of relational databases (PostgreSQL, MySQL), proficient in schema design, query optimization, and leveraging SQLAlchemy with Alembic for migrations. Redis experience for session management and caching. • Solid experience handling asynchronous tasks, background jobs, and scheduled processes using Celery alongside brokers like Redis or RabbitMQ. • Daily experience using Docker, container management, and integrating code into automated CI/CD pipelines (GitHub Actions, GitLab CI, Jenkins). • Strong grounding in web security best practices (OWASP Top 10, JWT, OAuth2, CORS handling) and automated testing frameworks (pytest). • Located in the CET timezone (+/- 3 hours), we are unable to consider applications from candidates in other time zones. Nice-to-Have • Experience decomposing Flask monoliths into modern asynchronous microservices (FastAPI/Go). • Experience with frontend integration (React, Vue, or Jinja2 templating for legacy apps). • Familiarity with cloud platforms (AWS, GCP, or Azure) and serverless infrastructure (AWS Lambda, Zappa). Responsibilities: • Design, build, and maintain scalable REST APIs and backend architectures using Flask, ensuring clean separation of concerns and modular blueprints. • Audit and optimize database queries, request-response lifecycles, and caching policies to ensure low latency and continuous platform uptime. • Integrate third-party APIs, payment gateways, and internal microservices using secure webhooks and message queues. • Maintain high test coverage using pytest, perform code reviews, and implement strict security protocols for user authentication and authorization. • Collaborate with infrastructure teams to containerize applications, manage environment configurations, and streamline deployment workflows. What we offer: Get paid, not played No more unreliable clients. Enjoy on-time monthly payments with flexible withdrawal options. Predictable project hours Enjoy a harmonious work-life balance with consistent 8-hour working days with clients. Flex days, so you can recharge Enjoy up to 24 flex days off per year without losing pay, for full-time positions found through Proxify. Career-accelerating positions at cutting-edge companies Discover exclusive long-term remote positions at the world's most exciting companies. Hand-picked opportunities, just for you Skip the typical recruitment roadblocks and biases with personally matched positions. One seamless process, multiple opportunities A one-time contracting process for endless opportunities, with no extra assessments. Compensation Enjoy the same pay, every month with positions landed through Proxify.