unbuffered.io - Viktor L. - Seasoned DevOps Engineer

Viktor L.

Seasoned DevOps Engineer

Viktor is a veteran DevOps engineer with several years of experience at major companies like Amazon and Adevinta. He knows the SDLC and how to deploy and manage vast numbers of servers and microservices with automation.

Certifications

Certified Kubernetes Administrator (CKA)

Cloud Native Computing Foundation (CNCF)

Validity: 2019-01-01 - 2020-01-01

Credential ID: Loosz, CKA-1900-004577-0100

The Linux Foundation Certification Verification Tool

Education

Computer Science - BSC

University of Pécs - Faculty of Engineering and Information Technology

2006-09-01 - 2010-07-01

Portfolio

Authentication System (Development)

Designed an authentication system that acts as a proxy in front of the application (called service) that needs to be protected. The service's code does not have to be modified as the proxy handles the authentication and authorization. Most of the components are built on top of open-source libraries and projects. The project is in use for securing an in-house Kafka API.

Zero-downtime Migration of Kafka Clusters (Development)

Devised a way of migrating data (topics, ACLs, and more) without downtime on several production Kafka clusters. The execution was mostly automated with tested scripts (mostly Python) with a runbook (set of instructions) for the manual actions. The migration was challenging because the customer had connections from different sources (VPC, VPC peering, direct connect, internet, and over VPC as well).

Automated E2E Testing of Internal Components (Development)

Designed and developed an end-to-end testing framework to test an internal console in a CI/CD pipeline. The codebase was designed in a way that it is reusable and the underlying components can be replaced with other technologies.

Experience

Staff DevOps Engineer

Adevinta
2018 - Not specified

Designed an authentication and authorization system for general use (OIDC based with an external IDP).
Worked as part of a team that builds and runs (you build it, you run it) managed Kafka and Cassandra services for our internal customers.
Shared knowledge about Kafka in workshops.
Operated and managed a huge Kafka and Cassandra infrastructure.
Worked with customers on different projects.

Systems Engineer

Amazon Web Services
2016 - 2018

Managed customer RDS instances and their data.
Worked as part of a team that managed and maintained several internal and external tools of the relational database service (RDS) platform.
DImplemented automated testing with infrastructure standard tools
Designed the console’s architecture (monitoring and alarming)
Served as part of the on-call rotation for the whole RDS platform.

Lead Systems Engineer

Virgo Systems
2012 - 2016

Designed the architecture and implemented the electronic toll system (HU-GO), the national mobile payment system (NMFR), and the electronic public road trade control system (EKÁER)
Designed and built EÉR
Built and maintained E-Digital
Led the operations team
Managed Hungary’s biggest social network site (Iwiw.hu)
Managed projects in public cloud services AWS
Designed and maintained our clients’ systems (Arukereso.hu, MTT, NPLI, Szaklista.hu, and more)