--- title: "CV - Marcin Jasion" description: "Curriculum vitae of Marcin Jasion - Senior Site Reliability Engineer." canonical: https://mjasion.pl/cv/ --- # Marcin Jasion **Senior Site Reliability Engineer** · Warsaw, Poland - Email: hello@mjasion.pl - Web: https://mjasion.pl - LinkedIn: https://www.linkedin.com/in/marcinjasion - GitHub: https://github.com/mjasion - PDF: https://mjasion.pl/cv.pdf ## Summary Senior Site Reliability Engineer based in Warsaw. I work where code meets infrastructure - diagnosing incidents, fixing the observability gaps that hide them, and shipping the boring-but-important changes that prevent the next outage. Currently helping engineering teams operate a system of 1000+ services at NatWest Boxed - mostly Java services in an asynchronous, Kafka-based architecture. 13 years in tech: started as a Java developer, found my home in the messy middle where applications meet production. ## Experience ### [NatWest Boxed](https://www.natwestboxed.com) - Warsaw, Poland Banking-as-a-Service platform from NatWest Group. As an SRE consultant I support almost 30 engineering teams operating a system of 1000+ services - mostly Java services in an asynchronous, event-driven architecture built on Kafka. My work spans incident response, observability, and reliability improvements across the platform. Teams are organised using Team Topologies and mine is an enabling team, so it cuts across many different stream-aligned squads. **Senior Site Reliability Engineer (Consultant)** (Feb 2025 – Present) - Support almost 30 engineering teams resolving production incidents across a system of 1000+ services - Act as an enabling team in a [Team Topologies](https://martinfowler.com/bliki/TeamTopologies.html) setup — bridging stream-aligned squads with shared SRE practice - Improve observability - metrics, logs, traces - to shorten time-to-detect and time-to-diagnose - Build agents for incident handling and streamline the resolution process for on-call engineers - Drive reliability improvements that prevent recurring outages and reduce on-call toil ### [Datachain (former Iterative.ai)](https://datachain.ai) - Global (Remote) Datachain builds open-source tools for machine learning, offering team collaboration products as SaaS and self-hosted solutions. **Senior Platform Engineer** (Jul 2022 – Dec 2024) - Designed a multi-cloud platform for running distributed ML experiments with billions of objects (AWS and GCP) - Designed and implemented Kubernetes Pod autoscaling based on Celery queue depth - Designed the on-premise, enterprise edition of DVC Studio to run reliably in arbitrary customer environments (ESXi, Hyper-V, KVM) - Implemented new CI/CD pipeline reducing feature delivery time by 50% - Coordinated large-scale engineering efforts for SOC2 certification - Achieved 40% reduction in cloud expenses by optimizing system designs - Expanded GitOps + IaC coverage to improve disaster recovery resilience ### [Equinix](https://equinix.com) - Warsaw, Poland Equinix is the leader in the colocation data center market. Joined to implement CloudNative practices on Kubernetes and automate Istio Service Mesh for GDPR-compliant connectivity. **Senior DevOps Engineer** (Aug 2020 – Apr 2022) - Led migrations of 3 systems (40 microservices) to make infrastructure GDPR compliant - Designed architecture and migration process from on-premise to cloud - Delivered automation of cloud infrastructure (K8s, Istio Service Mesh, observability, CD pipelines) - Supported other teams in solving AWS, Kubernetes, and networking issues - Mentored teammates on infrastructure code quality and design ### [Codility](https://codility.com) - Warsaw, Poland Technical interview platform for testing coding skills. Joined ahead of the migration from instance-based (EC2) infrastructure to CloudNative Kubernetes. **Senior Site Reliability Engineer** (Jan 2020 – Jul 2020) - Kept online services and infrastructure running in good health - Ensured infrastructure security against unauthorized access and interruptions - Educated engineers on modern cloud computing standards and good practices **DevOps Engineer** (Nov 2018 – Dec 2019) - Designed architecture for migration from EC2 to Kubernetes - Improved CI/CD pipelines and developer tooling ### [F5 Networks](https://www.f5.com) - Warsaw, Poland F5 specializes in application security, multi-cloud management, and network security. Joined to develop a secure gateway for CloudNative services; project concluded with the NGINX acquisition. **Senior Software Engineer** (Feb 2018 – Oct 2018) - Implemented CloudNative services in Go - Designed pipelines for unit, integration, and end-to-end tests with multi-project execution - Automated packaging into Amazon Machine Images (AMI) ### [TouK](https://touk.pl) - Warsaw, Poland Software house building solutions for external clients. Moved from Java development to DevOps to gain experience as infrastructure administrator and cloud solutions architect. **DevOps Engineer** (Aug 2015 – Feb 2018) - ELK Stack aggregating 50 TB of data for Play Mobile - 16 nodes, 2 TB memory - Play Now - designed scalable Cloud Native delivery pipelines and third-party integrations for a new mobile operator - Virginmobile MVNO - 2 years of infrastructure maintenance and architectural improvements - Migrated parts of internal infrastructure to AWS (e.g. autoscaling GitLab runners) **Java Developer** (Jan 2014 – Oct 2015) - Developed application stack for managing product catalog for Play Mobile operator ### [Risco Software](https://risco.pl) - Warsaw, Poland Software house delivering systems for financial institutions and private companies. **Java Developer** (Dec 2012 – Dec 2013) - Express ELIXIR Adapter - immediate transfer system for CitiBank S.A. - Maintained back-office systems for FM Bank and BankBPS - Developed components of the Paymax mobile payment system ## Skills - **Claude** - My main model and agent for work and programming - incident triage, writing and reviewing code, drafting docs, and building agents, mostly through Claude Code. - **Kubernetes** - 5 years of extensive experience designing, deploying, and managing containerized applications at scale. - **Istio** - 3 years of experience in deploying, configuring, securing, and managing service meshes. - **Go Development** - 6 years of experience writing scalable, testable, and maintainable programs. - **TypeScript** - Typed JavaScript for building maintainable web apps and tooling - including this site, built with Astro and TypeScript. - **Java** - Started my career on the JVM. Years building backend services and APIs in Java - still the foundation of most platforms I operate today. - **AWS** - 8 years of experience designing, deploying, and managing secure, scalable cloud solutions. - **GCP** - 2 years of experience. Designed a multi-cloud platform using GKE with workloads on AWS and GCP. - **Cloudflare** - Pages, Workers, R2, DNS, and Zero Trust - running this site on Cloudflare Pages and using Workers for edge content negotiation. - **Datadog** - Daily driver for observability across 1000+ services - dashboards, monitors, SLOs and error budgets, APM traces, and log pipelines for incident response. - **Grafana** - Years of experience building dashboards and alerting on top of Prometheus for multi-cloud platforms. - **Prometheus** - Designed and operated Prometheus-based monitoring stacks for Kubernetes workloads - metrics, recording rules, and alerting. - **Argo CD** - GitOps delivery for Kubernetes - app-of-apps, sync waves, and multi-cluster rollouts to keep environments declarative and auditable. - **GitHub** - 8+ years using GitHub for collaboration, code management, and CI/CD with GitHub Actions. - **Terraform**, **Helm**, **Prometheus / Grafana** ## Certifications - [AI_Devs 3: Agents](https://www.aidevs.pl) - AI_Devs · 2024 - [CKAD: Certified Kubernetes Application Developer](https://www.youracclaim.com/badges/448c4beb-c7bb-427b-95cd-9b0669e77f81/linked_in_profile) - Linux Foundation · May 2020 - May 2023 - [CKA: Certified Kubernetes Administrator](https://www.youracclaim.com/badges/d07b5711-5692-4501-a311-18b6358bdf83/linked_in_profile) - Linux Foundation · Nov 2019 - Nov 2022 ## Talks & Publications - GitOps - Czyli konfigurowanie Kubernetesa Gitem - SysOps/DevOps Warszawa MeetUp #48 · 27.02.2020 - GitOps - Czyli konfigurowanie Kubernetesa Gitem - Confitura 2019 · 29.06.2019 - Autoscaling GitLab CI - SysOps/DevOps Warszawa MeetUp #42 · 27.06.2019 - [DNS query metrics plugin for Telegraf](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/dns_query) - open-source contribution ## Education - M.Sc. in Engineering, Computer Science - Warsaw University of Technology (2013 – 2016) - Engineer's degree, Computer Science - Warsaw University of Technology (2009 – 2013) ## Languages - Polish - Native - English - Professional working