Senior Fullstack Backend Engineer (Python & AI/ML)

🚀 Senior Fullstack Backend Engineer (Python & AI/ML)

 Location: Poland (Remote or Hybrid from Krakow's Office)
 Contract: B2B, Full-Time

Join the Future of Digital Tech with Kolomolo

At Kolomolo, we don’t just follow trends - we set them. As a global supplier of IT services and digital modernization solutions, we help businesses embrace cutting-edge technology to optimize their operations. Now, we are growing and looking for fresh talent to grow with us.

Are you proactive, tech-savvy, and eager to build your career in IT? This role could be your perfect fit.

About the Role

We are looking for a highly experienced Senior Fullstack Backend Engineer with deep expertise in Python to architect, build, and maintain scalable backend systems and APIs. This role blends backend development with modern AI/ML capabilities, including Generative AI integrations, and offers opportunities to contribute to both backend and frontend features. You will work closely with product, design, and data teams in agile environments to deliver robust, high-performance services that power innovative products. This is an exciting opportunity to work at the intersection of backend engineering, cloud infrastructure, and cutting-edge AI technologies.

 What You’ll Be Doing

• Architect, build, and maintain scalable backend systems and APIs using Python and modern frameworks (e.g., FastAPI, Django, Flask).
• Design and extend services to integrate with databases, authentication, and third-party APIs.
• Develop and maintain data processing pipelines and backend integrations for product features.
• Own end-to-end delivery: backend architecture, deployment, CI/CD pipelines, testing, and performance optimization.
• Implement and expose AI/ML/GenAI features (e.g., LLM integrations, embeddings, vector search) as part of backend services.
• Collaborate with frontend developers on API design and occasionally contribute to frontend features (React/TypeScript).
• Participate in code reviews, bug triage, and feature optimization.
• Work closely with product, design, and data teams in agile environments (Scrum/Kanban).

 What We Are Looking For

• 8+ years of professional software development experience, with a strong focus on backend systems.
• Deep proficiency in Python for building scalable services and APIs.
• Solid understanding of databases (PostgreSQL, MongoDB, or equivalent) and data modeling.
• Experience with RESTful APIs, microservices, and containerized deployments (Docker/Kubernetes).
• Strong foundation in software engineering best practices: testing, CI/CD, modular code, and performance tuning.
• Excellent problem-solving, communication, and collaboration skills.

Nice to Have

•  Familiarity with AI/ML frameworks (e.g., PyTorch, TensorFlow, Hugging Face, LangChain) and interest in Generative AI applications.
• Knowledge of MLOps practices (CI/CD for ML, experiment tracking, model deployment pipelines).
• Experience with frontend technologies (React, TypeScript) to support full-stack development when needed.
• Exposure to cloud platforms (AWS, GCP, Azure) and serverless architectures.

What is in It for You

 Competitive salary and benefits.

 Career development opportunities in a growing tech company.

 Continuous learning culture: mentorship, internal training, and certifications.

 Flexible, agile work environment (remote, hybrid, or on-site in Kraków.

 Office perks: great coffee, tea, fresh fruit, snacks, and a fun atmosphere.

 Flat management structure, where your voice matters.

 Regular team events and a social, supportive work culture.

 B2B contract or Contract of Mandate (Umowa Zlecenie).

🌟 Why Join Kolomolo?

At Kolomolo, we prioritize innovation, agility, and autonomy. Our teams have the freedom to own their work, share ideas, and make meaningful contributions. Inspired by Scandinavian values, we believe in work-life harmony and creating an inclusive culture where everyone thrives.

You will be part of a passionate, skilled, and friendly team that works hard and celebrates together. Here, you can build your career on your own terms, with opportunities to grow, learn, and make a real impact.

Our Flat Structure & The Culture of Inclusion