AI-Driven Backend Engineer for Production Systems

Upside; Polska; Hybrid; PLN 180,000 - 240,000; Full time

Job summary

Upside is seeking a seasoned software engineer in Poland to own backend and cloud system delivery, collaborating with client teams and product managers. You will apply LLM coding agents to production-grade software and drive architecture with a strong emphasis on security and performance.

You will work in a hybrid setup from Kraków or remotely within Poland, with opportunities to influence open-source frameworks and scalable solutions for international brands.

Qualifications

• Proven background as a Software Engineer who built and owned backend/cloud systems.
• Production experience with LLM coding agents.
• Hands-on experience shipping LLM-powered features.
• Fluent English (C1+) for international collaboration.
• University degree in Computer Science, Software Engineering, or a related technical field.

Responsibilities

• Work directly alongside client engineering and product teams on business requirements, architect solutions, and own delivery all the way through to production.
• Drive complex system development with coding agents as your core delivery engine, manage context, decompose architectural specs into agent-executable tasks, and run work in parallel under strict quality control.
• Review generated implementations critically, design the tests, evals, and runtime checks that catch edge cases and silent failures, and hold a high bar on security, performance, and maintainability.
• Make the foundational design calls on data models, integration boundaries, security parameters, and trade-offs, and document them for both human and synthetic contributors.
• Share proven workflows, evaluation methods, and agent orchestration patterns so the whole engineering team levels up, and contribute to Upside's open-source frameworks

Skills

Python

Client-facing communication

Ownership & accountability

Software engineering

English fluency

Education

University degree in Computer Science or Software Engineering

Tools

Claude Code

OpenAI Codex

AWS

Docker

Kubernetes

Job description

Upside is seeking a seasoned software engineer in Poland to own backend and cloud system delivery, collaborating with client teams and product managers. You will apply LLM coding agents to production-grade software and drive architecture with a strong emphasis on security and performance.

You will work in a hybrid setup from Kraków or remotely within Poland, with opportunities to influence open-source frameworks and scalable solutions for international brands.