Senior Fullstack Backend Engineer (Python & AI/ML)

About the Position

🚀 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.

Responsibilities

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).

Requirements

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.

We Offer

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

At Kolomolo, we break the corporate mold. We offer:

Agile Teams & Autonomy: No micromanagement. You’ll own your projects and enjoy the freedom to innovate.
Work-Life Harmony: Inspired by Scandinavian values, we prioritize balance and flexibility, where remote work and asynchronous collaboration are in our DNA.
Learning & Growth: Continuous learning is at our core. We reward hard work, value smart ideas, and foster an environment of mutual respect and trust.
Inclusive Culture: We believe in DEI: diversity, equity and inclusion. We are committed to creating an environment where every individual, regardless of background, identity, or experience feels valued, respected, and empowered to thrive.

About Kolomolo

To be leaders in digital modernization by helping companies embrace the latest cutting-edge technologies to optimize their business with the help of our talented experts.

Founded in: 2016

Co-workers: About 100

Turnover: 5M

Ready for the next step? Apply now and start an exciting journey of growth and innovation with us!