Backend Engineer — AI-Driven Systems (Small Teams)

upside; Polska; Hybrid; PLN 112,000 - 215,000; Full time

Job summary

Upside is hiring a Backend Engineer to build and scale platforms for global clients. Join a small, autonomous team and own resilient systems while staying close to code and delivering high-impact solutions.

You will work directly with founders and CTOs on technical decisions, with autonomy to choose tools and shape architecture for mission-critical logic and AI-driven client products.

Qualifications

• Experience: 2+ years of commercial experience in building web applications (Python or Ruby).
• Fundaments: Solid understanding of OOP, clean code, and software development lifecycles.
• Databases: PostgreSQL.
• Infrastructure: Git, Docker, and CI/CD pipelines.
• Mindset: Proactive, curious, and ready to take ownership of your tasks.
• AI-Native: You use tools like Claude or Cursor to work smarter and faster.
• English: Great command of written and spoken English for team and client communication.

Responsibilities

• Technical Execution: Build and maintain scalable backend systems with a focus on clean, maintainable code.
• Proactive Problem Solving: Identify issues early and propose actionable ways to fix or optimize them.
• Collaboration: Work closely with the team and stakeholders to translate requirements into working technology.
• Knowledge Sharing: Share your findings and lessons learned from the code to help the team grow.
• AI Implementation: Support the integration of Applied AI features into client products.

Skills

2+ years experience

OOP

English communication

Proactive mindset

Tools

Python

Ruby

PostgreSQL

AWS

Docker

Kubernetes

Job description

Upside is hiring a Backend Engineer to build and scale platforms for global clients. Join a small, autonomous team and own resilient systems while staying close to code and delivering high-impact solutions.

You will work directly with founders and CTOs on technical decisions, with autonomy to choose tools and shape architecture for mission-critical logic and AI-driven client products.