Senior Fullstack Engineer

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At Upside, we’re 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 Senior Fullstack Engineer, you will play a pivotal role in designing, developing, and maintaining production-grade platforms for our global clients. This position is at the heart of our development efforts, contributing significantly to the backbone of our client-facing solutions. You\'ll be part of a dynamic development team, sized between 3 to 9 members, dedicated to crafting scalable and resilient backend systems.

• Extensive commercial experience in building web-based applications (+5 years).
• Experience in at least one of Upside’s backend technology stack : Ruby, Python, JavaScript or the willingness to learn based on your current skills.
• Experience in at least one of Upside’s frontend technology stack : Vue and React or the willingness to learn based on your current skills.
• In-depth understanding of SQL and relational databases .
• Experience with Continuous Integration and Continuous Delivery .
• Experience in direct work with different stakeholders (e.g. Product Owners or Business Founders) in a consulting setting.
• Deep understanding of end-to-end software development cycle .
• Great command of written and spoken English .

Key Responsibilities

What We Offer

Salary : Senior Engineer : 20 800 - 25 900 PLN net + VAT

Lead Engineer : >

25 900 PLN net + VAT

Location : Office in Kraków, hybrid, fully-remote.

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