Senior Backend Engineer
UpsideKrakow, Lesser Poland Voivodeship, Poland • Poland
Posted December 29, 2025
20800 - 25900 PLN
Full Time
About the Company
Upside is a technology company founded in 2016 that leverages personalization, data analytics, mobile apps, digital marketing, retail tech, and fintech to increase the financial power of individuals and brick-and-mortar businesses. By enhancing purchasing power and boosting profitability, Upside also contributes to sustainability initiatives, making a significant impact on both economic empowerment and environmental responsibility.
Job Description
Upside is a software consultancy built by engineers, for engineers. We partner with global companies to solve real, complex technical challenges.
Requirements
- 5+ years of building web applications (preferably in Python frameworks)
- Completed university degree in computer science, data science or similar field
- Deep understanding of monoliths, microservices, and messaging patterns
- Expert knowledge of PostgreSQL and performance optimization at scale
- Practical experience with CI/CD, Docker, and AWS/GCP
- Fluent (C1) English for direct client collaboration
Benefits
- Built for the long run
- Small teams, real accountability
- Mission-critical work
- Real Ownership
- No Micromanagement
- Collaborative R&D
- Growth through challenges
- Applied AI as a first-class discipline
- The tools you want, without the approval process
- Transparent progression path