What we do

  • Cassandra

    • Consulting
    • Design
    • Remote DBA
    • Training
  • Software

    • Architecture design
    • Rest API design
    • Full stack development
    • Proof-of-concept development
  • DevOps

    • Automated deployment and maintenance
    • Ansible
    • Capistrano
  • Telecom BSS

    • CRM
    • Web channels
    • Billing & rating
    • Product catalog
    • APIs

Who we are

  • Hannu Kröger

    Hannu has helped multiple companies (including telecom carriers) accelerating digital services using highly scalable and multi redundant technologies delivering tens of thousands of transactions and gigabytes per second.

    The systems architected mainly contain big data components like Apache Cassandra, MongoDB, Docker, Scala and RESTful JSON APIs. Hannu is the first DataStax certified Apache Cassandra trainer in Northern Europe.

  • Teemu Kupari

    Teemu has 15 years of international experience in professional software development with CRM and billing systems, mobile and web programming, database design and maintenance, system integrations, data migrations etc.

    His technology knowledge includes C/C++, Symbian, Ruby, Rails, Javascript, jQuery, MySQL, SQLite, Python, Node.js and many more. He’s especially interested eliminating waste of resources and selecting the right tools for the task at hand.

Our customers

  • Cleac Oy
  • Galaxo Oy
  • IsoRatas Oy
  • Nokeval Oy
  • Nosto Oy
  • Stayfilm
  • Vigiar Solutions

Contact us

  • Upsert Oy

    contact@upsert.fi
    +358 40 7183523
    Helsinki / Jyväskylä, Finland

    VAT ID: FI27596238

  • Street address

    Upsert Oy
    Punavuorenkatu 4 A 4
    FI-00120 Helsinki
    Finland