Staff Software Engineer

At Upside were partnering with ambitious companies across the globe to solve complex meaningful problems through technology. We work in focused teams combining engineering product thinking and design to deliver outcomes not just output.

Open-source is a strategic part of our work. We build and maintain a number of open-source projects that support our clients and internal R&D. Our latest release is Enthusiast a customizable agentic AI toolkit for e-commerce.

Role Overview:

As a Staff Software Engineer you will guide engineering teams in delivering production-grade platforms and AI-driven solutions for global clients. Youll shape technical direction support team members and collaborate closely with business leaders to design systems that truly move the needle. This is a hands-on role: while youll be deeply engaged in architectural decisions and strategic conversations youll also remain close to the code ensuring that technical excellence is a lived standard not just an aspiration.

• Extensive commercial experience in building web-based applications (7 years) including 2 years in a leadership role (Tech Lead Team Lead or similar).

• Solid expertise in at least one of the following frameworks: Python Ruby JavaScript and readiness to explore new technologies when needed.

• Proven ability to design and oversee complex architectures (monoliths microservices distributed and asynchronous systems messaging patterns scalability).

• Strong understanding of databases (PostgreSQL preferred) and performance optimization at scale.

• Experience in cloud-native environments and CI/CD practices.

• Excellent consulting skills balancing technical excellence with business needs and the ability to communicate effectively with both technical and non-technical stakeholders (CTOs founders product leaders).

• Demonstrated ability to mentor engineers provide constructive feedback and foster technical growth.

• Fluent English (clear written and verbal communication).

Key Responsibilities:

• Leading autonomous teams (39 people) in designing building and deploying complex digital platforms.

• Driving architecture and technology choices for large-scale systems.

• Mentoring engineers fostering technical excellence knowledge sharing and a collaborative culture.

• Partnering directly with clients technology leaders and founders to co-create impactful solutions.

• Balancing technical depth with business context to deliver long-term value.

• Ensuring engineering best practices code quality and CI/CD pipelines are consistently applied.

• Staying close to AI/ML solutions and identifying opportunities to integrate them into client solutions.

What We Offer

• Transparent progression path.

• Flexible work: office in Kraków hybrid or remote from anywhere in Poland with company on-sites.

• Additional paid days off beyond national holidays.

• A deeply collaborative engineering-led company culture.

• Support for ongoing learning.

If you didnt find all the information you were looking for have a look at our handbook - it covers a variety of different matters that could be important at this stage. If theres anything else we did not mention that youre interested in - share your thoughts with us

Salary:

Staff Software Engineer: 26 500- 37 000 PLN net VAT

Including additional days off

Location:

Office in Kraków hybrid fully-remote.