Email.cz - Extracting image features from emails

• Tracking images detection
• Resulted in academic paper (see research)

System for automatic crypto currency trading

Email.cz

• Listík, Vít. “Phishing Email Detection in Czech Language” (2015)
• Šimon, Let. “Phishing Email Detection based on Entity Recognition” (2017)

Email.cz

• Petr Liška, User Authentication based on Keystroke Dynamics, 2016

Email.cz

• Šimon Ondráček, Personalised Antispam filter for Email.cz, 2016

Email.cz - keyword based sender domain recogntion

Example MNIST CNN model implementation

• Custom data loader

Jupyter notebooks with explanations how neural networks work. Used for presentation.

• High performance URL shortener supporting multiple storage and caching backends
• Benchmarks for this project https://github.com/tivvit/shush-benchmarks

• Prototype self-hosted instant messenger using Web sockets implemented in Golang
• React UI with Google Auth
• The main feature is that messages and replies may be nested to threads indefinitely, which enables the communication to flow naturally but stay clear.

• Datasets project solves problem with organizing data sets.
• It also tries to ensure experiment consistency and repeatability by data set immutability, unique identification, usage and change logs.

Based on: Halevy, Alon, et al. “Goods: Organizing google’s datasets.” Proceedings of the 2016 International Conference on Management of Data. ACM, 2016.

Internal web pages for monitoring and managing services

Custom made reservation system for indoor surfing

Extract PDF article author and title and present them on web page

This site is generated via Jekyll and it also generates my CV.

We have developed app supporting RPG game on DevFest 2014 in Czech Republic with David Vávra.

App uses Google Appengine Endpoints, Dart for Dashboard and Android client for organizers.

Company presentation

Hackaton project based on data gathered in Prague. Map showing index of living in a area based on air cleanliness, internet speed and other metrics.

Real estate agent presentation with custom made management system

PDF to website converter which makes fast reading PDFs possible.

E-shop for photos from public events

Combinatorial optimization problem

Pure JS Tower Defence game.

• App supporting easier learning sign language for physically handicapped preschool children.
• Manging team of 14 developers

• Coffee house presentation, Original photos, CMS
• Custom made e-shop
• 2 historical versions

Custom made FW (rewriting to Nette)

Booking system for Pilates lessons

• Salaries
• Cash-flow
• User management
• Automatical booking

3 historical versions

• Facebook data processing
• Web scraping

• Improving and maintaining sites written in PHP
• Single page forms in jQuery

School project, Statistics for time spent on activities and sleep

• Kronch responsive 2013
• Surmon + internal site for project documentation and management responsive 2013
• Dius (2013)
• Martinaklesnilova responsive 2013
• Anova responsive 2013
• Evadilna responsive 2013
• Kumajutsu responsive 2013
• Pezinskyporcelan 2014

• Upgrade of vyuka.web-kladno.cz
• Custom made Moodle for mathematical problems solved as homeworks
• Automatic grading, Statistics, Sharing learning materials, Pretty mathematical syntax and automatic resolving, Virtual Classroom management, Result normalisation and verification

Custom made CMS, multi-language, Charter ships menu is pure CSS

Web crawler that searches for IT related events and stores them at one place

Job search engine for medical related jobs

Gopay module, Customization, Optimizations

Chrome and Firefox plugins showing discounts for currently viewed page

• My first web project, Nowadays it is running on my custom CMS
• User registration and customised profiles (small social site)

Company presentation

• Pertr Ledl - Personal page (2013)
• Bouble trouble - Swimming club (2013)

• Aerospike proxy aggregating database writes and caching database reads
• Multi-DC replication

• Make on steroids aiming to ML use-cases
• Dependency graph resolution and visualization
• Stage results caching when inputs did not change
• Run reports - used for reproducible experiments
• Inspired by DVC and Github Actions

• Sending log messages from Apache Kafka to Grafana Loki
• Scalable - currently processing over a million log messages per second
• Routing and transformations of the log content

• Component of an internal cloud used for billing

• Kubernetes Admission Webhook for checking user resource privileges in a multi-tenant cluster

• I added support for tailing to Grafana Frontend
  • https://github.com/grafana/loki/pull/2032
• I fixed several issues in metrics and docs
  • https://github.com/grafana/loki/pulls?q=author%3Ativvit+
• I reported many bugs
  • https://github.com/grafana/loki/issues?q=author%3Ativvit+

• I fixed issue with invalid utf8 labels exported from aerospike to Prometheus
  • https://github.com/alicebob/asprom/pull/44
  • https://github.com/alicebob/asprom/pull/43
  • https://github.com/alicebob/asprom/pull/42
  • https://github.com/aerospike/aerospike-prometheus-exporter/pull/24
  • https://github.com/aerospike/aerospike-prometheus-exporter/pull/19
  • https://github.com/aerospike/aerospike-prometheus-exporter/pull/18

Infrastructure for all Seznam.cz services. Deploying Kubernetes to thousands of servers. Deployment pipeline and best practices.

Taking care of email development clusters

• Hadoop ~10 servers in dev (Cloudera)
• Migrating Elasticsearch cluster to version 5,6 and to dockerized environment (help with production migrations)
• MooseFS storage cluster

Cooperation with administrators of production clusters

~10 servers

Server management for web projects

2 servers

Buying new equipment, support

20+ computers

Buying new equipment

~10 computers

~5 computers

Email.cz - data aggregation pipeline based on ZMQ

• Cient mock - Mock for testing
• Deleter - Deleting sets
• Bloom filter - Bloom filter
• Lua Bloom filter - Bloom filter implemented only in lua

Dictionary insensitive to upper-case string keys

Decorator for caching function output based on params

Home monitoring toolkit. Talk about this project at Devfest 2015

Email.cz

• DMARC integration (libopendmarc)
• DKIM integration (libopendkim)
• SPF integration (libopenspf)

Bachelor thesis: Real-time measuring and processing application for respiratory system parameters

Finding input boxes on scanned forms.

Games:

• Wolf goat cabbage game (2012)
• Brickout (2011)
• Command-line PacMan (2010)

Maintaining and developing Hadoop and Spark jobs. Several TBs of email traffic metadata generated and processed every day.

Visual programming tool. I have integrated database and R modules.

Beverages and food

Beverages and food

Jewelry

Martial arts competitions and events