Senior Site Reliability Engineer (f/m/x)

Sii Poland; Warszawa; On-site; PLN 210,000 - 270,000; Full time

Benefits offered by this job

Great Place to Work

Centre of internal trainings

Profit sharing

Medical care

Open management team

Job summary

Sii Poland is seeking an experienced Senior Site Reliability Engineer to design, build, and operate a highly automated multi-cloud provisioning platform. You will act as a core technical authority, defining reliability standards and mentoring the engineering team.

You will drive automation, performance, and scalability across production stacks while collaborating with product teams to embed reliability and security early in the SDLC. Strong English and Poland residency are required.

Qualifications

• 8+ years of hands-on experience in Software Engineering, DevOps, or Systems Infrastructure
• At least 3 years of advanced expertise with AWS
• Proven experience provisioning and scaling Kubernetes clusters in production
• Strong English and residency in Poland
• Ability to deliver production-ready automated infrastructure without daily supervision

Responsibilities

• Architect and drive reliability, scalability, and performance of the multi-cloud provisioning platform
• Implement end-to-end automation pipelines to reduce manual toil
• Define, monitor, and improve SLIs/SLOs for data-driven decisions
• Collaborate with product and cross-functional teams on reliability and security in SDLC
• Design robust incident detection, lead RCA, and implement long-term fixes
• Audit platform operations to remove bottlenecks and single points of failure

Skills

Advanced English

Technical communication

Autonomy in architecture decisions

Tools

AWS

Kubernetes

Azure

Python

Job description

We are looking for an experienced Senior Site Reliability Engineer to join our team and design, build, and operate a product-driven, highly automated multi-cloud provisioning platform. In this role, you will act as a core technical authority, driving automation and defining reliability standards while mentoring the engineering team. If you are passionate about engineering excellence and system reliability, this opportunity may be the right fit for you.
Your tasks

• Architect and drive the reliability, scalability, and performance of our multi-cloud provisioning platform across all production stacks
• Implement end-to-end automation pipelines to eliminate manual intervention and reduce technical toil
• Define, monitor, and improve critical system health indicators (SLIs/SLOs) to make data-driven architectural recommendations
• Collaborate with product and cross-functional engineering teams to embed reliability and security considerations early in the software development lifecycle (SDLC)
• Design robust incident detection mechanisms, triage critical incidents, and lead deep Root Cause Analysis (RCA) to implement long-term preventative engineering solutions
• Audit platform operations to identify bottlenecks, eliminate single points of failure, and reduce structural complexity

Requirements

• Minimum 8 years of hands‑on experience in Software Engineering, DevOps, or Systems Infrastructure
• At least 3 years of advanced expertise with AWS, including architecting and troubleshooting cloud environments
• Proven experience managing, scaling, and provisioning Kubernetes clusters in production
• Demonstrated autonomy in making architectural decisions and delivering production-ready, automated infrastructure without daily supervision
• Strong technical communication skills with the ability to align with Technical Leads and collaborate across engineering teams
• Advanced level of English and residency in Poland

Nice to have

• Experience with Microsoft Azure
• Proficiency in Python

Job no. JOB-E9HY4
Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.
Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care