Backend Developer

About Us We are Up. We design and deliver digital-first employee benefits that transform the workplace experience. We believe that happy and healthy employees work better and smarter. Our solutions help you achieve this by improving productivity and reducing costs, while consistently delivering an exceptional user experience. Each offering is shaped around two core principles: simplicity and fun. After all, the best solutions are easy to implement, hassle-free, and enjoyable for everyone involved! Today, we empower tens of thousands of leading companies across Greece to engage and retain their people. We continuously refine the Up experience based on insights from our users, always looking ahead to the future of work. We have earned a 96% trust index in the Great Place to Work survey! Up Hellas is a wholly owned subsidiary of Up Group, present in 34 countries worldwide. www.uphellas.gr www.up-group.coop About the position We are seeking a talented and experienced Backend Developer to join our team. You’ll be working on a microservices-based platform in the fintech space, building and maintaining systems for payment processing, card management, and financial services. The role involves designing, implementing, testing, and maintaining backend solutions across multiple Python services. Key responsibilities: Backend Development: Design, develop, and maintain backend services using Python and associated frameworks (Django, FastAPI). Collaborate with cross-functional teams to define, design, and ship new features. Work within a microservices architecture, understanding service boundaries and inter-service communication. Optimize and refactor existing code for improved performance and maintainability. API Development: Design and implement RESTful APIs to support frontend and mobile applications. Ensure API security and authentication mechanisms are robust and up-to-date. Collaborate with frontend developers to integrate frontend components with backend services. Database Management: Work with various databases, ensuring efficient and optimized queries. Design and implement database schemas, ensuring data integrity and performance. Perform database migrations and handle versioning. Testing and Quality Assurance: Write unit tests and conduct thorough testing to ensure the reliability and stability of backend components. Collaborate with the quality assurance team to identify and fix bugs and improve overall system performance. Documentation: Create and maintain comprehensive documentation for backend systems and APIs. Document code and solutions for future reference and ease of collaboration. Collaboration: Work closely with frontend developers, product managers, and other stakeholders to understand project requirements and ensure timely delivery of high-quality solutions. Participate in code reviews and peer coding to maintain code quality and share best practices Requirements: Bachelor's degree in Computer Science, Engineering, or a related field. 4+ years of proven hands-on Software Development experience in Python Strong knowledge of at least one major Python framework (Django, Flask, FastAPI) SQL knowledge, especially related to query efficiency and optimization Experience with both external and embedded databases (PostgreSQL, MySQL), as well as with cache engines (Redis) Proficient understanding of CI/CD pipelines and code versioning tools, such as Git Solid understanding of both the functional and object-oriented programming paradigms and how they apply to the Python language Familiarity with concepts of MVC, ORM and RESTful Analytical mindset and good problem-solving skills. Excellent written and verbal communication in English Desired, but not mandatory: Experience with cache engines (Redis) Experience with message brokers (RabbitMQ) and async task processing (Celery) Familiarity with async Python (asyncio, FastAPI async patterns) Experience with NoSQL databases (MongoDB) Experience working with cloud services (AWS, Azure) Experience in working with Atlassian platform (Jira, Confluence) Knowledge of front-end technologies (React, HTML, CSS) Background in fintech, payments, or regulated industries We offer A dynamic working environment Lots of benefits: FlexOne, Fitpass, Private medical plan, breakfast (yes – you read that correctly!) A full-time, indefinite contract Location: Athens’ Headquarters All information received will be treated with strict confidentiality. #LI-Hybrid