Sergej Ostashchuk available

Sergej Ostashchuk

Architect, cloud engineer, data engineer, DevOps, DataOps

Profileimage by Sergej Ostashchuk Architect, cloud engineer, data engineer, DevOps, DataOps from Bratislava
  • 85101 Bratislava Freelancer in
  • Graduation: not provided
  • Hourly-/Daily rates:
  • Languages: German (Elementary) | English (Full Professional) | Russian (Native or Bilingual) | Slovakian (Native or Bilingual)
  • Last update: 03.12.2020
Profileimage by Sergej Ostashchuk Architect, cloud engineer, data engineer, DevOps, DataOps from Bratislava

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Solution delivery: architecture, implementation, operation support, technical management.
In my work I combine experience, knowledge of fundamental and new hot technologies, and traditional concepts of quality and reliability.

IT automation
AWS, DevOps, DataOps
(big / cloud) data analytics (incl. BI, DS, ML)
Hands-on architect, cloud and data engineer, DevOps, developer
AWS Certified Solutions Architect - Associate
Certified Scrum Master, agile practitioner

- Public and private clouds, infrastructure management, automation
- DataOps lead, data architecture, data management
- Data lakes, DWH, EL-T, data pipelines, streaming, (big) data analytics, BI

With experience in:
- finance solutions, banking, insurance, telecommunications, online business
- technical management, agile project delivery
- rescuing troubled projects

Other skills and experience:
- Technical lead, product owner
- Configuration management: Terraform, Chef, Ansible
- Big data analytics: Hadoop, Kafka, Spark, BI, ETL, OLAP, RDBMS, NoSQL
- ML and DS projects (DevOps)
- System integration, networking, security
- Extensive programming experience: Bash, SQL, Java, Python, Scala,
- DevOps tools: Docker, Git, Artifactory, JIRA, Confluence, Jenkins
  • 01/2006 - Present

    • Digital Rain
    • < 10 employees
    • Internet and Information Technology
  • Architect, Consultant, Developer
  • Architect, engineer, consultant, developer.
    Various projects and customers (some of them listed below)

  • 04/2020 - 08/2020

    • Raiffeisen Bank International AG
    • >10.000 employees
    • Banks and financial services
  • DataOps Lead
  • Project: Cloud-based big data analytics solution

    Large international project with multiple teams participating at implementation.

    - initiating and leading the adoption of DataOps methodology
    - participating at solution architecture, data lake design, system integration, 3-rd parties integration

    Technologies: AWS, S3, Lambda, data lake, data flows, data pipelines, DWH, Salesforce Marketing Cloud.

  • 05/2019 - 09/2019

    • Cards & Systems EDV-Dienstleistungs GmbH
    • 500-1000 employees
    • Banks and financial services
  • Apache Kafka & Big Data Architect
  • Project 1: Distributed payment platform

    - data layer architecture
    - message hub
    - underlying infrastructure

    - infrastructure concept for deploying data layer, event streaming and individual microservice components
    - event stream processing concept
    - Apache Kafka cluster with additional components and tools

    Technologies: private cloud, Apache Kafka, MongoDB, microservices, Java, Docker

    Project 2: DWH & BI solution concept

    The idea was to create a conceptual template of typical solution architecture and project implementation plan, to be reused many times.

    - overall concept
    - agile solution architecture
    - infrastructure concept
    - agile implementation plan (project phases, task backlog, team structure)

  • 12/2016 - 06/2018

    • Munich Re Group
    • >10.000 employees
    • Banks and financial services
  • Big Data Consultant, Architect
  • Project: Corporate Big Data Analytics Platform

    The idea of the core project was to create a global corporate big data self service platform, so all company departments and teams, all subsidiaries and potentially external customers across the world will be able to implement own big data analytics and data science projects by themselves, effectively and in agile style.

    - solution and platform architecture
    - infrastructure management
    - configuration management, automation
    - user and data administration
    - multi-tenant security and access management
    - operation, monitoring, maintenance
    - data engineering support
    - data science support

    Personally responsible for:
    - data streaming platform (architecture, implementation, security)
    - multiple Apache Kafka clusters (installation, configuration)
    - Apache NiFi (installation, configuration)
    - data science projects automation (design, implementation)
    - DataRobot (installation, support)

    - private cloud, Hortonworks Data Platform, Hadoop, Ambari, HDFS, Hive, Spark, Kafka, Solr, Ranger
    - Data science applications, Jupyter, R Studio, DataRobot
    - Hortonworks DataFlow, Apache NiFi
    - DevOps and configuration management tools: Chef, Git, Artifactory, Docker

  • 09/2016 - 10/2016

    • IBM
    • >10.000 employees
    • Internet and Information Technology
  • Big Data and Apache Kafka Consultant
  • Project: marketing and social networking platform for big international company.

    Responsibilities: event streaming cluster in AWS cloud

    - data streaming requirements, solution design,
    - capacity and performance planing,
    - infrastructure architecture
    - Apache Kafka cluster deployed and configured ready to use

    Technologies: AWS, Kafka, Hadoop

  • 05/2015 - 07/2016

    • Teradata GmbH
    • 5000-10.000 employees
    • Internet and Information Technology
  • Big Data Consultant
  • Big data projects for customers - Siemens, Audi, Metro.

    Responsibilities: solution architecture, integration, training, consulting.

    Technologies: Teradata, Hadoop, Kafka

  • 11/2014 - 04/2015

    • GameDuell GmbH
    • 500-1000 employees
    • Internet and Information Technology
  • Senior Database & Hadoop Engineer
  • Project: Online gaming platform

    Responsibilities: big data, DWH and BI platform.

    Technologies: Hadoop, Kafka, Storm, Java, PostgreSQL, DWH, BI, DS, real time analytics

  • 05/2013 - 10/2013

    • Openet
    • 1000-5000 employees
    • Telecommunications
  • Delivery manager
  • Project: Policy and Charging Control system for Orange Slovakia.

    - manage final phase of solution delivery
    - ensure final acceptation
    - resolve communication issues and technical conflicts

  • 10/2012 - 04/2013

    • Openet
    • 1000-5000 employees
    • Telecommunications
  • Architect, Technical product owner
  • Responsibilities:
    - architecture, business requirements, technical specification
    - backlog management
    - research, evaluation and assessment of new technologies

  • 04/2008 - 10/2012

    • Openet
    • 1000-5000 employees
    • Telecommunications
  • Lead Engineer
  • Online charging systems for A1 Telekom Austria and its subsidiary operators in other European countries:
    - Online Charging System for A1 Telekom Austria
    - Bill Shock Prevention for A1 Telekom Austria
    - Online Charging System for SiMobil Slovenia
    - Online Charging System for VipMobil Serbia
    - Disaster Recovery solution for VipMobil Serbia

  • 01/2004 - 04/2008

    • Orange
    • 1000-5000 employees
    • Telecommunications
  • Technical manager, architect, developer
  • Multiple projects
    (technical management, architecture, system integration, Oracle, Java,
    DWH, business applications)

Working remotely. Travelling possible when restrictions lifted.