Jarosław Gryczan

• Designed and built the company's AWS platform from scratch: multi-account landing zone (Organizations, IAM Identity Center SSO, VPC, peerings, PrivateLink)
• Led the migration from GCP to AWS (closer to crypto exchanges); ran EKS clusters with the addon layer managed as Terraform code
• Established the end-to-end SDLC: GitLab CI building container images and application artifacts, ArgoCD GitOps and a shared Helm library, plus branching and release standards
• Operated a low-latency, multi-region fleet of EC2 trading VMs running crypto trading strategies and exchange connectors, optimised for speed (CPU and kernel tuning, Terraform + Ansible)
• Built the datalake platform on EKS (Kafka - MSK and Strimzi, ClickHouse) with automated backups; observability with on-call (Grafana Mimir/Loki/Tempo, Alertmanager, GoAlert) and cloud cost management (FinOps)

See this in the cluster → axb-hub

• Part of the platform team behind the shared GCP platform used by the venture builder's product companies (trading, fintech and SaaS)
• Ran GKE clusters and managed all GCP resources as Terraform code - a monorepo of ~60 reusable modules covering GKE, VPC networking, IAM, databases and messaging
• Built Kafka-based data pipelines for analytics (Strimzi, Kafka Connect, PostgreSQL replication); operated NATS and PostgreSQL (Cloud SQL, CloudNativePG)
• Deployed the Istio service mesh and Velero-based cluster backups across the platform
• Established the end-to-end SDLC for workloads on Kubernetes (GKE), standardised across ventures: ArgoCD, shared Helm charts, Bitbucket Pipelines
• Ran observability as code, including distributed tracing built from scratch across the organization (Grafana Mimir/Loki/Tempo, OpenTelemetry Collector, OpsGenie); platform hardening (IAM as code, secrets management, Kyverno policies) and cloud cost management; mentored developers

See this in the cluster → iceo

• Same platform scope prior to promotion; incidents and on-call included.

See this in the cluster → iceo

• Acted as the technical point of contact for the client: demos, acceptance of deliverables, requirements clarification
• Coordinated the work of the DevOps team: task planning, review and delivery
• Continued hands-on engineering scope: ETL pipelines (Kafka, Apache Spark, Debezium), Postgres HA clusters (Patroni), Kubernetes, ELK logging platform

See this in the cluster → savigo

• Maintained ETL pipelines built on Kafka, Apache Spark (PySpark), Debezium and Python
• Managed Postgres HA clusters (Patroni) and Kubernetes clusters
• Maintained and developed a central logging platform based on the ELK stack
• Deployed and maintained JupyterHub on Kubernetes with custom OpenStack integrations; developed new solutions using JupyterLab

See this in the cluster → savigo

• Worked on the internal systems of a telco operator (SMSC project): Kubernetes deployments and Helm charts for microservices
• Ran CI/CD pipelines in Jenkins; tested releases and deployed within service windows
• Operated Cassandra, RabbitMQ and the EFK stack; provisioned environments with Ansible
• Wrote Python/Bash automation and monitored environments with Zabbix

See this in the cluster → mobees