Senior Python Developer

Startup Environment, High Ownership, Demanding Clients

Join our startup-like environment filled with new ideas, rapid change, and a strong focus on priorities and delivery.

We are looking for a Senior Python Developer - someone experienced, open-minded, and ready to take real ownership of both product and technical direction. You will work closely with demanding clients, solve complex engineering problems, and help shape ambitious, high-performance systems.

This role is for engineers who enjoy responsibility, fast feedback loops, architectural challenges, and working under pressure.

Your primary responsibilities beyond the will to change the world

• Act as a technical partner for clients: analyze business needs, challenge requirements, and propose effective, scalable solutions
• Take full ownership of complex features - from concept and architecture through implementation, testing, and automated deployment
• Design system architecture, APIs, and data models for high-load, data-intensive systems
• Deliver core and business-critical components of projects
• Work in a dynamic, startup-style environment with changing priorities, tight deadlines, and real product pressure
• Proactively identify risks, bottlenecks, and technical debt, and drive improvements
• Ensure high code quality, performance, and reliability
• Support and mentor other developers, helping raise engineering standards across teams

Must have

• 5+ years of commercial software development experience, including strong professional experience in Python
• Excellent knowledge of Python 3.11+ (typing, dataclasses, modern best practices)
• Production experience with modern Python frameworks ( async FastAPI preferred, Falcon welcome, Async SQLAlchemy 2.0)
• Strong expertise in API design (REST, GraphQL)
• Solid understanding of databases and data-driven systems (relational, document, search, key-value stores)
• Advanced knowledge of software engineering principles (OOP, SOLID, YAGNI, TDD)
• Extensive experience with unit testing (pytest), CI/CD pipelines, Docker, and deployments
• Proven ability to build efficient, low-latency, scalable systems
• Confidence working with tight deadlines, pressure, and frequently evolving requirements
• Very good written and spoken English
• Strong communication skills and a proactive, ownership-oriented mindset

Experience we'd appreciate, too

• Experience in system architecture and technical leadership
• Asynchronous programming and high-concurrency systems
• Messaging systems and distributed architectures
• DDD and event-driven design
• Cloud and DevOps experience (AWS / Azure)
• Mentoring and influencing technical direction of projects

Nice to have

• Community involvement (meetups, open source, speaking)
• Writing technical articles or internal knowledge-sharing

A list of benefits is long so we will mention only about the crucial ones:

• Challenging projects with real business impact
• Work in a startup-like environment: fast decisions, autonomy, responsibility
• 100% remote or office in Poland (Wrocław / Zielona Góra)
• Sport subscription
• Private healthcare