Senior Backend Engineer — AI-Native Systems

Shelf; Warszawa; On-site; PLN 240,000 - 420,000; Full time

Benefits offered by this job

Company Stock Options

MacBook Pro

GitHub Copilot

Open-source software

Job summary

Shelf is looking for middle to senior backend engineers to design and own critical systems. You will take real ownership from architecture to production, delivering scalable, reliable backend services. The role emphasizes clear communication, strong judgment, and scalable engineering practices.

The team values AI-native approaches, code quality, and collaboration with product and platform engineers. Expect growth through ownership and impactful, scalable solutions on a hard mission.

Qualifications

• Backend senior engineering experience in production systems.
• Strong Python skills and clean, maintainable backend code.
• Good distributed systems judgment: concurrency, failure handling, data consistency, async work, service boundaries.
• Hands-on cloud infrastructure experience (AWS, GCP, or Azure).
• Comfort with database schema design and performance tuning for real-time/high throughput.
• Security-focused approach to enterprise-grade requirements and sensitive data.

Responsibilities

• Build backend services, APIs, data flows, and background processing for production systems.
• Turn vague requirements into concrete technical plans and execution.
• Own services after launch: reliability, observability, performance, and incident follow-through.
• Instrument deployments and use production signals to iterate.
• Design sound system boundaries, data models, interfaces, and scaling paths.
• Collaborate with product, frontend, and platform teams to deliver end-to-end outcomes.
• Raise engineering leverage with AI tooling and internal workflows.

Skills

Backend Engineering

Python

Systems Thinking

Cloud (AWS/GCP/Azure)

Databases

Security

Ownership

Communication

AI-Native

Tools

TypeScript

APIs

Job description

Shelf is looking for middle to senior backend engineers to design and own critical systems. You will take real ownership from architecture to production, delivering scalable, reliable backend services. The role emphasizes clear communication, strong judgment, and scalable engineering practices.

The team values AI-native approaches, code quality, and collaboration with product and platform engineers. Expect growth through ownership and impactful, scalable solutions on a hard mission.