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Hi, I am Marijus

Marijus Kasperavicius

Reliability Engineer

I am an engineer. I turn metrics into actions. Reliability for me includes security as well. And I know what does it mean to run service with 99.999 availability. Have to admit I do dopamine-driven development: if there is a problem, I can’t stop solving it. Creating elegant, expandable and efficient systems inspires me.

Reliability
Security
Leadership

Skills

Kubernetes
Kubernetes

Capable of deploying, managing application on Kubernetes. Experienced in managing complex apps of apps deployments with ArgoCD.
Observability
Observability

I favour metrics due its shorter path to actions (alerts in simpliest form and trends, root cause analysis or preventive actions in more complicated cases). Thus Grafana and Proetheus are used pretty heavily. Even with Elastic I will aim for the dashboards to feel the pulse. With tracing worked mainly with Elastic APM.
GitOps
GitOps

Ability to trace quickly down to source code is significant in quick problem resolution. Declarative appraoch is even better as imperative might still have some execution branches, binaries or history which might add extra downtime.
Java stack
Java stack

Spent majority of the time with all flavors of Java: started with J2EE, Apache (most memorable Camel) then Spring and Reactive with Reactor, later Kotlin, a little bit Clojure and Scala to be more functional formaly."
Go Development
Go Development

Using as the main language for professional development. Capable of writing scalable, testable, and maintainable program.
Cloud Computing
Cloud Computing

At Nasdaq first projects were delivered on AWS. At SIX continued my path Azure cloud.
Docker
Docker

Docker image for me artefact to deliver. Idealy accompanied with helm chart.
React
React

Most actively worked with react on Vilnius Carpool project - those times redux was introduced and I have got immutability and functional programming experience.
C and C++
C and C++

The first language I learned (read a book). Soon moved to Object oriented programing with C++
Assembler
Assembler

Yes I did this. But it was long time ago. Mainly for Microchip PIC16F886 programming.

Experiences

1
SIX Digital Exchange

Apr 2019 - Oct 2025

Zürich, Switzerland

The World’s Leading Financial Market Infrastructure for Digital Assets

Head of SRE

Oct 2022 - Oct 2025

Responsibilities:
  • Directed a team of six engineers, providing technical guidance and delivering scalable SRE products
  • Managed 20+ enterprise-grade systems distributed across 10 Kubernetes (OpenShift and AKS) clusters
  • Developed a vulnerability monitoring process to resolve 80% of high-level image vulnerabilities on time
  • Led the implementation of HSM-hardened certificate issuance automation for more than 100 certificates per month
  • Optimized backup architecture, cutting time from 2.5 hours to 15 minutes by storing only essential data
  • Reduced Azure costs by 30% in a year through advanced analysis tools and disciplined cost reviews
  • Created Grafana and Elastic dashboards to reach CI/CD reliability above 95%
  • Grounded the collaboration of four teams in facts to deliver a confidential-computing solution with Fireblocks, Intel SGX, HP, Securosys and Red Hat.
  • Successfully coordinated a team to mitigate database cluster issues, severe security attacks and other critical incidents
  • Implemented incident tickets augmentation using RAG and Azure AI services
Tech Lead

Apr 2019 - Oct 2022

Responsibilities:
  • Architected FINMA licensed production CSD deployment using ArgoCD GitOps
  • Assured system meets compliance requirements to get license from regulator
  • Assembled a demo for the Board of Directors to ensure the project’s continuity
Nasdaq

Sep 2016 - Apr 2019

Vilnius, Lithuania

Global technology company serving the capital markets and other industries.

Principal Architect

Jul 2018 - Apr 2019

Responsibilities:
  • Delivered a production-grade eVoting system processing 50 TPS on a ledger with Thales HSM, deployed on AWS with Kubernetes
Lead Architect

Sep 2016 - Jul 2018

Responsibilities:
  • Led 5 engineers to a successful DvP on ledger PoC for SIX, driving scope through behavior-driven development
  • Delivered a Proof of Concept for USD tokenization in collaboration with CitiBank
2
3
Telia

Nov 2001 - Aug 2016

Vilnius, Lithuania

Leading telecommunications company in the Nordic region.

Product Development Manager

Jul 2010 - Aug 2016

Responsibilities:
  • Established governance for application development and ran projects using agile methodologies (Scrum, Kanban).
  • Automated tests using SIPp and Cucumber; assured maintainability with Ansible.
  • Developed a highly reusable SIP-SLEE application framework
  • Developed a provisioning system using Apache ServiceMix
  • Introduced ElasticSearch APM for observability
Value Added Services Architect

Feb 2009 - Jul 2010

Responsibilities:
  • Developed Messaging and IN services.
  • Upgraded OSS system (NetAct).
Project Manager

Jan 2005 - Feb 2009

Responsibilities:
  • Managed technical projects for Inventory, Fault and Performance management
Senior System Administrator

Jan 2003 - Jan 2005

Responsibilities:
  • Administered Java system that I have developed
Software Engineer

Nov 2001 - Jan 2003

Responsibilities:
  • Developed a self-care portal on IBM WebSphere.
  • Exposed API for third parties to top up Prepaid services.
  • Developed Webmail for operator customers.
Eltera

Nov 2000 - Nov 2001

Vilnius, Lithuania

Automation enineering company

Software Engineer

Nov 2000 - Nov 2001

Responsibilities:
  • Developed microcontroller for security systems
  • Administered IT infrastructure
4

Education
Vilniaus Universitetas
2002-2004
Master's degree in Computer Science
Vilniaus Universitetas
1998-2002
Bachelor's degree in Computer Science

Projects

Pharos
Pharos
Architect, Developer June 2025 - Present

Automate the security scanning, vulnerability management and compliance reporting.

professional
Star
Image handler
Image handler
Architect, Developer July 2025 - September 2025

Seamless DORA reporting with minimal configuration

professional
Star
Vilnius carpool
Vilnius carpool
Architect, Developer Nov 2015 - Jun 2016

Ride sharing platform for Vilnius residents - part of Code of Vilnius initiative

hobby
Star

Accomplishments

Speexx B2.2 certificate
Speexx Feb 2024 - Sept 2024

German language course

View Certificate
German Language B1 fide certificate
Fide Mar 2024

German language skill assesment

View Certificate