Viktor is available for hire

Viktor Loosz

Verified Expert in Engineering

Distributed Systems Developer

Location

Hungary

Toptal Member Since

December 2, 2019

Viktor is a seasoned DevOps engineer with several years of experience who's worked for major companies (AWS), and he joined Toptal to look for remote side projects. He feels confident with Linux- and Unix-based systems and has led small teams of 5-6 people. Viktor knows the ins and outs of SDLC and how to successfully deploy and manage vast numbers of servers and microservices with a high level of automation and minimal manual intervention.

Scalability Linux DevOps MySQL Git Amazon Web Services (AWS)Apache Kafka Ansible AWS CloudFormation PHP Distributed Systems Apache Cassandra MacOS Agile Python Virtualization Engineering Spinnaker Travis CI BGP

Portfolio

Adevinta

Amazon Web Services (AWS), DevOps, Linux, Travis CI, Spinnaker, Kubernetes...

Amazon Web Services

Amazon Web Services (AWS), DevOps, Linux

Virgo Systems

Amazon Web Services (AWS), Linux, Border Gateway Protocol (BGP), Networks...

Experience

Linux - 20 years DevOps - 10 years MySQL - 10 years Distributed Systems - 10 years Amazon Web Services (AWS) - 6 years Apache Kafka - 5 years Docker - 4 years Kubernetes - 2 years

Availability

Part-time

Preferred Environment

Apache Kafka, Amazon Web Services (AWS), DevOps, Linux, Continuous Delivery (CD), Continuous Integration (CI), Python, Git

The most amazing...

...project I've worked on was running and managing hundreds of servers with three people in a 24/7 rotation without pages for months.

Work Experience

Staff DevOps Engineer

2018 - PRESENT

Adevinta

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.
Operated and managed a huge Kafka and Cassandra infrastructure.
Designed an authentication and authorization system for general use (OIDC based with an external IDP).
Shared knowledge about Kafka in workshops with our internal teams.
Worked with customers on different projects regarding integrations to our components, providing solutions for networking.

Technologies: Amazon Web Services (AWS), DevOps, Linux, Travis CI, Spinnaker, Kubernetes, Python, Cassandra, Apache Kafka

Systems Engineer

2016 - 2018

Amazon Web Services

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

Technologies: Amazon Web Services (AWS), DevOps, Linux

Lead Systems Engineer

2012 - 2016

Virgo Systems

Led the operations team.
Designed and built EÉR (electronic sales system).
Built and maintained E-Digital (a market leader webshop in Hungary).
Managed projects in public cloud services (AWS).
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).
Managed Hungary’s biggest social network site (Iwiw.hu).
Designed and maintained our clients’ systems (Arukereso.hu, MTT, NPLI, Szaklista.hu, and more).

Technologies: Amazon Web Services (AWS), Linux, Border Gateway Protocol (BGP), Networks, Firewalls, PHP, RHEL

Experience

Authentication System

I 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

I designed 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

I 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.

Skills

Languages

PHP, Python

Tools

Ansible, AWS CloudFormation, Git, Travis CI, Chef

Paradigms

DevOps, Continuous Integration (CI), Continuous Delivery (CD), Agile

Platforms

Amazon Web Services (AWS), Linux, Apache Kafka, Docker, MacOS, Spinnaker, Kubernetes

Storage

MySQL, Cassandra

Other

Scalability, Networks, Distributed Systems, Virtualization, Apache Cassandra, RHEL, Firewalls, Border Gateway Protocol (BGP)

Certifications

DECEMBER 2019 - DECEMBER 2022

Certified Kubernetes Administrator

CNCF

Collaboration That Works

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