HolyProducts builds and scales digital products for fast-growing companies worldwide. Our engineering teams embrace AI-augmented software development, combining strong engineering fundamentals with modern AI tools to accelerate implementation and testing, improve code quality, and enable engineers to focus on solving complex problems.

As we continue to grow, we're looking for a Senior Backend Developer who enjoys solving complex backend challenges, designing scalable systems, and thriving in a fast-paced environment where continuous learning, innovation, and AI-augmented development are part of everyday engineering.

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

Nice to have

• Experience designing and implementing autonomous coding workflows using AI agents and orchestration patterns
• Experience with CI/CD pipelines
• Microservices architecture
• Event-driven architecture
• Message brokers (Kafka, RabbitMQ, SQS)
• Experience with TypeScript, NodeJS
• Experience integrating LLM APIs

Why you'll love working here:

• 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

Sounds interesting?

If you are looking for an environment where you can grow professionally, learn from the best in the field, balance work and life habits and have a pleasant and enthusiastic environment, please submit your CV in English.