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Offer summary
(Summary generated by AI based on the full job description)
The project focuses on building scalable backend services and AI-native solutions. The stack centers on Python and working with cloud (AWS/GCP/Azure). Responsibilities include designing and shipping services, APIs, data flows and background processing, ensuring reliability, observability and performance, and handling post-incident follow-through. Required skills cover distributed systems judgment, database schema and performance tuning, security-conscious engineering and daily use of AI tools. Offered: high autonomy, growth in system design and architecture, collaboration in a small team, private medical care and sport subsidy.
from: 28 September 2026
to: 28 October 2026
130 - 170 złnet (+ VAT)/ hr.B2B contract (full-time)
Offer parameters
level:mid • senior
working mode:full office
Warszawa, Wola
Requirements
Expected technologies
Python
AWS / Azure / GCP
SQL / Relational Databases
REST API / Backend Development
Distributed Systems
Optional technologies
TypeScript
AI Agents / Agentic AI
LLM / GenAI
RAG
Microservices
Our requirements
- Strong senior-level backend engineering experience in production systems.
- Strong Python skills and the ability to design clean, maintainable backend code.
- Good distributed systems judgment: concurrency, failure handling, data consistency, async work, and service boundaries.
- Hands-on experience with cloud infrastructure such as AWS, GCP, or Azure.
- Comfort with database schema design and performance tuning for real-time and high throughput scenarios.
- A security-conscious approach to engineering: handle sensitive data carefully and consider security implications.
- Ability to go from problem statement to design to production rollout with real ownership.
- Clear written and verbal communication.
- AI-native working style; already use AI tools in daily engineering workflow.
Optional
- Experience building agentic systems: AI agents, tool-calling, orchestration, retrieval, or LLM-backed infrastructure in production.
- Working knowledge of TypeScript or the ability to contribute across the stack when needed.
- Experience shaping technical direction for other engineers, even without formal management responsibility.
Your responsibilities
- Design and ship backend services, APIs, data flows, and background processing for production systems.
- Turn vague requirements into concrete technical plans, trade-offs, and execution.
- Own services after launch: reliability, observability, performance, and incident follow-through.
- Instrument what you ship and use production signal to iterate.
- Make sound decisions around system boundaries, data models, interfaces, and scaling paths.
- Work closely with product, frontend, and platform engineers to deliver end-to-end outcomes.
- Improve engineering leverage with AI tooling, automation, and internal workflows.
- Raise the quality bar through code review, design review, and pragmatic technical leadership.
About the project
We are looking for a Middle/Senior Backend Engineer who can design, build and own business-critical production systems. You will have real ownership from system design through deployment, working on scalable backend services and AI-native solutions.
The team values technical excellence, clear communication, autonomy and practical decision-making. Engineers use modern AI tools such as Codex and Claude Code to improve development workflows and engineering efficiency.
This is how we organize our work
This is how we work
at the client's site
What we offer
- High level of autonomy and real impact on technical decisions
- Career growth in system design and architecture
- Collaboration within a small, experienced engineering team
- Opportunity to develop AI-native engineering practices
- Medicover
- Medicover Sport
Benefits
- sharing the costs of sports activities
- private medical care
Recruitment stages
- 1.Initial recruiter screening
- 2.1st technical interview
- 3.2nd interview with the client
- 4.Decision
SQUARE ONE RESOURCES sp. z o.o.
At Square One Poland we link IT experts with the business. With over 25 years of experience, we specialize in recruitment processes on a global scale. Despite years of experience, we still have a startup DNA and this is our advantage. Our offices are located in London and Warsaw, however, we can reach clients from all over the world, from start-ups to big worldwide corporations.
This is how we work
Senior Python Engineer
130–170 zł / hr. (B2B)
I apply to:
SQUARE ONE RESOURCES sp. z o.o.
Warszawa, Wola
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