Senior Backend Developer, Python
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Job Description
Senior Backend Developer at Holycode developing scalable backend applications using Python and AI-assisted tools. Collaborating with cross-functional teams and optimizing application performance in agile environments.
Responsibilities:
- Design, develop, and maintain scalable backend applications using Python
- Build high-performance RESTful APIs and backend services
- Design and optimize relational and NoSQL database models
- Use AI-assisted development tools (such as Claude Code, Codex, Gemini, or similar) as an integral part of the software development lifecycle, including implementation, testing, debugging, and code reviews
- Develop clean, maintainable, and well-tested code following best engineering practices
- Collaborate closely with frontend developers, product managers, QA engineers, and other cross-functional team members
- Participate in architectural discussions and contribute to technical decision-making
- Optimize application performance, scalability, and security
- Integrate third-party services and APIs
- Write and maintain technical documentation
- Perform code reviews and mentor other developers when needed
- Stay up to date with emerging backend technologies, frameworks, and engineering best practices
- Work in an agile environment with a strong focus on delivering high-quality software
Requirements:
- Bachelor's degree in Computer Science, Software Engineering, or related field
- Minimum 5 years of professional backend development experience
- Strong professional experience building backend applications with Python
- Strong experience with FastAPI (preferred), Django, Flask, or similar Python backend frameworks
- Experience designing scalable backend architectures
- Strong experience in database design, data modeling, and SQL databases
- Proven experience using AI-assisted coding tools (such as Claude Code, Codex, Gemini, or similar) to improve productivity while maintaining code quality, security, and engineering best practices
- Experience with PostgreSQL, MySQL and/or NoSQL databases
- Experience building REST APIs
- Experience with asynchronous programming
- Experience monitoring and debugging production systems
- Knowledge of OpenAPI/Swagger for API documentation
- Strong knowledge of software design principles
- Experience with Git and Docker
- Experience deploying applications to cloud platforms (AWS, Azure, GCP) or modern hosting platforms such as Railway, Supabase
- Experience writing automated tests and ensuring code quality
- Excellent problem-solving skills
- Fluent in spoken and written English
Benefits:
- Full-time employment with flexible working hours
- Work equipment provided
- 100% paid sick leave up to 30 days
- 25 days of paid vacation, plus one additional paid vacation day for every two years spent in the company
- Private health insurance
- Employee Referral Program
- Modern office in Belgrade with a fully stocked kitchen and game area
- Weekly team meals: Tuesday breakfast, Pizza/Barbecue Wednesday, and Friday lunch
- English and German language lessons during working hours
- New Year's gifts and theater shows for employees' children
- Opportunity to work on innovative products using modern technologies
- Supportive environment focused on learning, knowledge sharing, and professional growth
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