Wiktor Kisielewski

Alerting Platform

• Built a self-service alerting-as-code platform for approximately 60 developer teams, allowing developers and QA to manage their own alerts and thresholds.
• Created a common set of alerts to enforce alert coverage across services.

Incident Detection & Response

• Built an LLM-based incident detection tool that analyses internal chat messages for signs of incidents.
• Built a retrieval-augmented generation (RAG) tool that correlates incidents with past incidents, runbooks and postmortems to support faster investigation and recovery.
• Handled on-call shifts and managed cross-team (organisation wide) business incidents, responsible for root cause analysis and postmortem.

Observability Platform

• Consolidated separate monitoring systems into a shared platform for metrics, logs and traces, processing terabytes [2-3TB/day] of telemetry per day.
• Defined observability standards for 800+ microservices across cloud and on-premises infrastructure, including bare metal. Introduced wide events and shared metadata conventions.
• Worked with the team on OpenTelemetry auto-instrumentation for traces and unified metrics without application code changes
• Contributed to a sensitive-data scanner for logs and team reports covering alerts, incidents, metric coverage and log usage.

Sole DevOps engineer for an international, English-speaking startup providing multi-bank API for mortgage processes with integrations across multiple countries.

Cloud Migration & Infrastructure

• Led an AWS-to-GCP migration and infrastructure redesign that reduced infrastructure costs by approximately 40%, measured quarter over quarter after migration.
• Ran (+ migrated from "clickops" to IaC) AWS and GCP infrastructure, including Kubernetes, GitOps deployments, Terraform, Ansible and observability.
• Designed disaster recovery procedures and validated them through repeated restores of the full production environment.
• Ran chaos engineering experiments to assess the platform's response to infrastructure failures and owned BCP process.

Security, Compliance & Delivery

• Led infrastructure and product audit for ISO 27001 certification. Handled vulnerabilities and related issues to ensure certification.
• Introduced Git-tagged release approach and self-service deployments that were passed from DevOps to QA team.

Backend Development

• Contributed to backend development in Python/Django, supporting internal tooling and platform services.

• Automated platform deployment on customer infrastructure with Argo CD and Terraform, reducing setup time from days to minutes.
• Automated recovery from recurring failures (based on event-driven autoscaling), reducing out-of-hours alerts.
• Operated Kubernetes in the cloud and on-premises (vanilla, OKD, Rancher, k3s) for an AI/NLP platform, including GPU nodes, model serving and data pipelines.
• Consolidated monitoring and standardized bare-metal Kubernetes provisioning with Ansible.
• Maintained a multi-terabyte Elasticsearch cluster and Java-based web crawlers deployment.
• Took part in 24/7 on-call coverage for customer cloud and data center deployments.

• Built self-service Azure pipelines that let other teams run routine tasks without DevOps support.
• Automated Azure DNS and Private Link synchronization between regions with Azure Pipelines and PowerShell.

Monitored infrastructure (Zabbix) and troubleshot hardware in Wirtualna Polska's data centers.

Automated Trading Bot & Infrastructure

• Built and operate an automated trading platform (futures, options and fx markets) handling live market data ingestion, FIX protocol connectivity and order execution via few broker APIs.
• Runs on a self-hosted Proxmox homelab with a multi-node Kubernetes cluster across several VMs.
• Entire platform managed with Argo CD, Terraform and GitHub Actions pipelines — same tooling as production environments.
• Code is private, but happy to talk about this in detail.