Jeden za wszystkich, wszyscy za jednego

  • Tech

    Najnowsze technologie to nasza pasja. Jesteśmy web developerami, scrum masterami, a zarządzanie projektami czy architektura IT też nie są nam obce. To nie wszystko. Znajdziesz wśród nas administratorów, helpdeskowców i specjalistów ds. dostarczalności i compliance.

    ZOBACZ WIĘCEJ
  • Business
    & Marketing

    Piszemy, kreujemy, publikujemy i sprzedajemy. Media społecznościowe nie mają przed nami tajemnic, podobnie jak zarządzanie treścią, SEO czy design. Kim jesteśmy? Znajdziesz wśród nas marketerów, menadżerów produktu, grafików i specjalistów ds. sprzedaży.

    ZOBACZ WIĘCEJ
  • customer
    success

    We are tech-savvy and customer oriented multilinguists working as account managers and customer support specialists.

    ZOBACZ WIĘCEJ
  • back office

    Przywiązujemy dużą uwagę do szczegółów, a przy tym jesteśmy świetnie zorganizowani. Czym się zajmujemy? Księgowość, finanse, prawo, HR, zarządzanie biurem – dzięki nam wszystko w GetResponse działa jak w szwajcarskim zegarku.

    ZOBACZ WIĘCEJ

Ty i GetResponse

GetResponse LinkedIn

Senior Management

  • Szymon Grabowski
    Szymon Grabowski CEO
  • Daniel Brzezinski
    Daniel Brzezinski COO
  • Ola Grabowska
    Ola Grabowska Customer Success Director
  • Marta Zabłocka-Peterson
    Marta Zabłocka-Peterson CFO
  • Wojciech Zwiefka
    Wojciech Zwiefka CTO
  • Maciej Ossowski
    Maciej Ossowski Director of GetResponse Enterprise

Tech

Tech

We are the ones who bring the vision and ideas to life. We create, optimize, and deliver. We get stuff done.

We are web developers, scrum masters, project managers, data scientists, anti-abuse engineers, and tech geeks who love what we do.

Yeah, 'love what we do' may sound cliché, but it’s no joke for us! We build stuff that is used by the world — and that's golden.

GetResponse is 100% made in Poland, and we sell our software to 350,000+ customers from 192 countries. Being part of something bigger is like adrenaline, it gives meaning to what we do every day.

We love PHP, Perl, JavaScript, Ruby, CSS, HTML, VoIP, Java, Flash, C#, and Python. We are also crazy about data. MySQL, ElasticSearch, Hadoop are all our tools of the trade.

We learn eagerly, network, and expand our horizons. We take part in developer seminars, conferences, and workshops all the time. We unplug ourselves completely and get the ball rolling by rocking during the famous GetResponse CodeFests.

All that code rage makes us crave for great brain food. Tasty breakfasts, energy drinks, yummy cakes on Friday — they've got us covered. Sweet!

What are you waiting for?
Join us, and let’s deliver together!

ZESPÓŁ TECH:

  • Dariusz - Ruby Developer
    Dariusz - Ruby Developer

  • Paweł - Front-end Developer
    Paweł - Front-end Developer

  • Bartłomiej - Front-end Developer
    Bartłomiej - Front-end Developer

  • Łukasz - Helpdesk
    Łukasz - Helpdesk

  • Michał - IT Vice Director
    Michał - IT Vice Director

  • Jakub - IT Team Manager
    Jakub - IT Team Manager

  • Adam - Software Developer
    Adam - Software Developer

  • Tomasz - Ruby Developer
    Tomasz - Ruby Developer

  • Wojciech - Software Developer
    Wojciech - Software Developer

  • Maciej - Front-end Developer
    Maciej - Front-end Developer

  • Jakub - Application Tester
    Jakub - Application Tester

  • Andrzej - Software Developer
    Andrzej - Software Developer

  • Dariusz - Software Developer
    Dariusz - Software Developer

  • Tomasz - Software Developer
    Tomasz - Software Developer

  • Łukasz - IT Team Manager
    Łukasz - IT Team Manager

  • Grzegorz - System Administrator
    Grzegorz - System Administrator

  • Michał - Front-end Developer
    Michał - Front-end Developer

  • Przemysław - Application Tester
    Przemysław - Application Tester

  • Szymon - Junior JavaScript Developer
    Szymon - Junior JavaScript Developer

  • Tomasz - Software Developer
    Tomasz - Software Developer

  • Paweł - Senior Software Developer
    Paweł - Senior Software Developer

  • Tomasz - Software Achitect
    Tomasz - Software Achitect

  • Michał - Software Architect
    Michał - Software Architect

  • Michał - Software Developer
    Michał - Software Developer

  • Jakub - Software Developer
    Jakub - Software Developer

  • Maciej - Software Developer
    Maciej - Software Developer

  • Sławomir - IT Team Manager
    Sławomir - IT Team Manager

  • Dawid - JavaScript Developer
    Dawid - JavaScript Developer

  • Radosław - Software Developer
    Radosław - Software Developer

  • Jacek - Software Developer
    Jacek - Software Developer

  • Michał - Software Developer
    Michał - Software Developer

  • Maciej - iOS Developer
    Maciej - iOS Developer

  • Piotr - Software Developer
    Piotr - Software Developer

  • Bartłomiej - Helpdesk Coordinator
    Bartłomiej - Helpdesk Coordinator

  • Maciej - Vice IT Director
    Maciej - Vice IT Director

  • Mateusz - Software Developer
    Mateusz - Software Developer

  • Paweł - Front-end Developer
    Paweł - Front-end Developer

  • Marcin - Senior Software Developer
    Marcin - Senior Software Developer

  • Jakub - Front-end Developer
    Jakub - Front-end Developer

  • Roman - Chief Security Officer
    Roman - Chief Security Officer

  • Grzegorz - Software Developer
    Grzegorz - Software Developer

  • Łukasz - JavaScript Developer
    Łukasz - JavaScript Developer

  • Krzysztof - Ruby Developer
    Krzysztof - Ruby Developer

  • Paweł - Software Developer
    Paweł - Software Developer

  • Sławomir - SCRUM Master
    Sławomir - SCRUM Master

  • Rafał - JavaScript Developer
    Rafał - JavaScript Developer

  • Tomasz - Junior Application Tester
    Tomasz - Junior Application Tester

  • Krzysztof - System Administrator
    Krzysztof - System Administrator

  • Mieszko - Software Developer
    Mieszko - Software Developer

  • Oskar - Compliance Specialist
    Oskar - Compliance Specialist

  • Piotr - Front-end Developer
    Piotr - Front-end Developer

  • Piotr - Director of Anti-Abuse
    Piotr - Director of Anti-Abuse

  • Łukasz - SCRUM Master
    Łukasz - SCRUM Master

  • Artur - Software Architect
    Artur - Software Architect

  • Grzegorz - Android Developer
    Grzegorz - Android Developer

  • Maciej - Software Developer
    Maciej - Software Developer

  • Adrian - Software Developer
    Adrian - Software Developer

  • Paweł - Senior Software Developer
    Paweł - Senior Software Developer

  • Piotr - Junior Front-end Developer
    Piotr - Junior Front-end Developer

  • Bartosz - System Administrator
    Bartosz - System Administrator

  • Mikołaj - Software Developer
    Mikołaj - Software Developer

  • Tomasz - Anti-Abuse Specialist
    Tomasz - Anti-Abuse Specialist

  • Aleksandra - Compliance Communication Supervisor
    Aleksandra - Compliance Communication Supervisor

  • Paweł - Software Architect
    Paweł - Software Architect

  • Łukasz - Telecommunication Projects Coordinator
    Łukasz - Telecommunication Projects Coordinator

  • Marcin - Software Developer
    Marcin - Software Developer

  • Damian - IT Team Manager
    Damian - IT Team Manager

  • Michał - Software Developer
    Michał - Software Developer

  • Krzysztof - JavaScript Developer
    Krzysztof - JavaScript Developer

  • Maciej - Front-end Developer
    Maciej - Front-end Developer

  • Piotr - Software Developer
    Piotr - Software Developer

  • Paweł - Front-end Developer
    Paweł - Front-end Developer

  • Artur - Junior Application Tester
    Artur - Junior Application Tester

  • Patryk - Software Developer
    Patryk - Software Developer

  • Marta - Front-end Developer
    Marta - Front-end Developer

  • Arkadiusz - Junior Software Developer
    Arkadiusz - Junior Software Developer

  • Kacper - Senior Software Developer
    Kacper - Senior Software Developer

  • Marcin - Software Developer
    Marcin - Software Developer

  • Przemysław - Helpdesk
    Przemysław - Helpdesk

  • Ireneusz - Deliverability Engineer
    Ireneusz - Deliverability Engineer

  • Martin - Deliverability Analyst
    Martin - Deliverability Analyst

  • Jakub - Software Developer
    Jakub - Software Developer

  • Maciej - Senior Front-end Developer
    Maciej - Senior Front-end Developer

  • Rafał - IT Team Manager
    Rafał - IT Team Manager

  • Łukasz - Senior Front-end Developer
    Łukasz - Senior Front-end Developer

  • Jacek - iOS Developer
    Jacek - iOS Developer

  • Grzegorz - Senior Software Developer
    Grzegorz - Senior Software Developer

  • Piotr - System Administrator
    Piotr - System Administrator

  • Rafał - Front-end Developer
    Rafał - Front-end Developer

  • Jan - Software Developer
    Jan - Software Developer

  • Maciej - IT Security Engineer
    Maciej - IT Security Engineer

  • Tomasz - System Administrator Manager
    Tomasz - System Administrator Manager

  • Piotr - Software Developer
    Piotr - Software Developer

  • Tomasz - Software Architect
    Tomasz - Software Architect

  • Magdalena - SCRUM Master
    Magdalena - SCRUM Master

  • Michał - Telecommunication Specialist
    Michał - Telecommunication Specialist

  • Maciej - Software Developer
    Maciej - Software Developer

  • Bartosz - Senior iOS Developer
    Bartosz - Senior iOS Developer

  • Artur - Senior Software Developer
    Artur - Senior Software Developer

  • Anna - Deliverability Director
    Anna - Deliverability Director

  • Bartłomiej - Ruby Developer
    Bartłomiej - Ruby Developer

  • Maciej - SCRUM Master
    Maciej - SCRUM Master

  • Łukasz - Software Developer
    Łukasz - Software Developer

  • Marcin - IT Team Manager
    Marcin - IT Team Manager

  • Wojciech - IT Director
    Wojciech - IT Director

  • Michał - Junior Front-end Developer
    Michał - Junior Front-end Developer

  • Zbigniew - Software Developer
    Zbigniew - Software Developer

  • Adam - Junior JavaScript Developer
    Adam - Junior JavaScript Developer

  • Adam - System Administrator
    Adam - System Administrator

  • Bartosz - Junior Software Developer
    Bartosz - Junior Software Developer

  • Marcin - SCRUM Master
    Marcin - SCRUM Master

  • Halyna - Junior Application Tester
    Halyna - Junior Application Tester

  • Mateusz - Junior Application Tester
    Mateusz - Junior Application Tester

  • Błażej - Junior Application Tester
    Błażej - Junior Application Tester

  • Tomasz - Junior Software Developer
    Tomasz - Junior Software Developer

  • Łukasz - Junior JavaScript Developer
    Łukasz - Junior JavaScript Developer

  • Krystian -
    Krystian

  • Sebastian -
    Sebastian

  • Przemysław -
    Przemysław

  • Marcin -
    Marcin

Business
& Marketing

Business & Marketing

Awesome products speak for themselves, and we’re here to make them heard even louder and by the right people.

We show the world that email marketing and online communication can bring rave results with absolute ease. And to do so, we bring together an awesome bunch of skills, talents, and tools that are specialties for each of us.

'Creativity' is the keyword here (yes, we do specialize in keywords as well!). We create and plan ahead, juggle words, pictures, and links, talk to our customers and listen to what they need.

We are marketers, product managers, writers, social media geeks, design wizards, SEO magicians, and challenge seeking salespeople. We're learning all the time. In fact, learning is one of our everyday responsibilities. With the marketing world changing so fast, you can never say you’re done learning.

Our eyes and ears are always open because our job is to stay one step ahead. We do that thanks to various training opportunities, international business conferences, tradeshows that we eagerly take part in, and the best customers in the e-commerce market.

Since there’s so much to do every day, we always appreciate a good cup of coffee, preferably with a piece of delicious cake.

Hey, why don’t we meet over coffee one of these days?

ZESPÓŁ BUSINESS & MARKETING:

  • Wojciech -
    Wojciech

  • Małgorzata -
    Małgorzata

  • Hanna -
    Hanna

  • Marcin -
    Marcin

  • Justyna -
    Justyna

  • Taylor -
    Taylor

  • Zak -
    Zak

  • Oleg -
    Oleg

  • Scott -
    Scott

  • Michał -
    Michał

  • Jason -
    Jason

  • Daniel -
    Daniel

  • Łukasz -
    Łukasz

  • Michał -
    Michał

  • Katarzyna -
    Katarzyna

  • Marek -
    Marek

  • Przemysław -
    Przemysław

  • Katarzyna -
    Katarzyna

  • Natalia -
    Natalia

  • Bartosz -
    Bartosz

  • Yuchao -
    Yuchao

  • Maciej -
    Maciej

  • Simon -
    Simon

  • Rachel -
    Rachel

  • Adam -
    Adam

  • Paweł -
    Paweł

  • Kamil -
    Kamil

  • Peter -
    Peter

  • Kshitij -
    Kshitij

  • Agnieszka -
    Agnieszka

  • Abigail -
    Abigail

  • Sezgin -
    Sezgin

  • Natasza -
    Natasza

  • Pavel -
    Pavel

  • Małgorzata -
    Małgorzata

  • Ireneusz -
    Ireneusz

  • Michał -
    Michał

  • Alexander -
    Alexander

  • Monika -
    Monika

  • Michał -
    Michał

  • Karolina -
    Karolina

  • Egor -
    Egor

  • Miranda -
    Miranda

  • Aaron -
    Aaron

  • Mellissa -
    Mellissa

  • Patrick -
    Patrick

  • Marta -
    Marta

  • Michał -
    Michał

  • Marta -
    Marta

  • Patryk -
    Patryk

  • Patrycja -
    Patrycja

  • Anton -
    Anton

  • Paweł -
    Paweł

  • Dmitry -
    Dmitry

  • Piotr -
    Piotr

  • Sergey -
    Sergey

  • Mohd Taufik -
    Mohd Taufik

  • Maciej -
    Maciej

  • Katarzyna -
    Katarzyna

  • Agata -
    Agata

  • Bartosz -
    Bartosz

  • Amadeo -
    Amadeo

  • Igor -
    Igor

  • Maciej -
    Maciej

  • Katarzyna -
    Katarzyna

  • Natalia -
    Natalia

  • Agata -
    Agata

  • Beata -
    Beata

  • Bartłomiej -
    Bartłomiej

  • Przemysław -
    Przemysław

  • Michał -
    Michał

  • Paweł -
    Paweł

  • Mateusz -
    Mateusz

  • Julia -
    Julia

  • Piotr -
    Piotr

  • Jakub -
    Jakub

  • Artur -
    Artur

  • Olga -
    Olga

  • Nikolay -
    Nikolay

  • Piotr -
    Piotr

  • Marta -
    Marta

  • Marcin -
    Marcin

  • Weronika -
    Weronika

  • Marika -
    Marika

  • Aleksandra -
    Aleksandra

  • Kirill -
    Kirill

  • Elysia -
    Elysia

  • Andrzej -
    Andrzej

  • Evgeny -
    Evgeny

  • Krista -
    Krista

  • Paweł -
    Paweł

  • Hanna -
    Hanna

  • Martyna -
    Martyna

  • Marta -
    Marta

  • Paweł -
    Paweł

  • Anna -
    Anna

  • Mariusz -
    Mariusz

  • Alexey -
    Alexey

  • Kim -
    Kim

customer
success

customer success

We care about our customers and make sure all their questions are answered and problems solved quickly and seamlessly. We’re always here for them because we know their first impression of us is what they’ll think of GetResponse.

To make an impact like that is a great responsibility, but it’s also enormously satisfying! GetResponse customers are from all over the world, so we speak multiple languages.

They need guidance and assistance, so we educate them and help with whatever we can. And in doing that, we go far beyond answering support calls, proactively reaching out to our customers to answer any questions they might have.

Big companies or small, they have marketing challenges, so we help them achieve their goals. To put it in simple terms: we succeed at our jobs when our customers succeed with their businesses. Don’t worry if you’re just starting your career — we're a young, multinational team of eager learners!

You only need to speak fluent English, and we’ll teach you the rest during external and internal training sessions, there’s always plenty to learn! With a little help from the latest technologies and smart gadgets, you’ll quickly grasp all the intricacies of e-commerce and online marketing inside out.

If you’re ready to become the best customer service expert ever — join our team!

ZESPÓŁ CUSTOMER SUCCESS:

  • Kamil - Customer Success Advisor
    Kamil - Customer Success Advisor

  • Shannon - Senior Customer Service Representative
    Shannon - Senior Customer Service Representative

  • Magdalena - Customer Success Advisor
    Magdalena - Customer Success Advisor

  • Vita - Customer Success Advisor
    Vita - Customer Success Advisor

  • Galyna - Customer Success Supervisor
    Galyna - Customer Success Supervisor

  • Tomasz - Junior Front-end Developer
    Tomasz - Junior Front-end Developer

  • Kimberly - Customer Service Manager
    Kimberly - Customer Service Manager

  • Kristiana - Customer Success Supervisor
    Kristiana - Customer Success Supervisor

  • Tiago - Customer Success Advisor
    Tiago - Customer Success Advisor

  • Przemysław - Customer Success Advisor
    Przemysław - Customer Success Advisor

  • Aleksandra - Customer Service Director
    Aleksandra - Customer Service Director

  • Natalia - Customer Success Advisor
    Natalia - Customer Success Advisor

  • Dominika - Customer Success Advisor
    Dominika - Customer Success Advisor

  • Shelley - Customer Success Quality Specialist
    Shelley - Customer Success Quality Specialist

  • Kamil - Customer Education Expert
    Kamil - Customer Education Expert

  • Martyna - Customer Success Advisor
    Martyna - Customer Success Advisor

  • Olga - Billing Specialist
    Olga - Billing Specialist

  • Marta - Senior Customer Success Advisor
    Marta - Senior Customer Success Advisor

  • Oliwia - Customer Success Advisor
    Oliwia - Customer Success Advisor

  • Aldona - Customer Education Expert
    Aldona - Customer Education Expert

  • Arno - User Support Technician
    Arno - User Support Technician

  • Wojciech - Senior Customer Success Advisor
    Wojciech - Senior Customer Success Advisor

  • Natalia - Anti-Fraud Manager
    Natalia - Anti-Fraud Manager

  • Jan - Customer Success Coach
    Jan - Customer Success Coach

  • Ryan - CS Representative
    Ryan - CS Representative

  • Jerry - CS Representative
    Jerry - CS Representative

  • Małgorzata - Customer Success Team Manager
    Małgorzata - Customer Success Team Manager

  • Katarzyna - Senior Customer Success Advisor
    Katarzyna - Senior Customer Success Advisor

  • Marta - Senior Customer Success Technical Advisor
    Marta - Senior Customer Success Technical Advisor

  • Alexander - CS Representative
    Alexander - CS Representative

  • Karolina - Customer Success Coach
    Karolina - Customer Success Coach

  • Oxana - Customer Success Advisor
    Oxana - Customer Success Advisor

  • Jeff - CS Representative
    Jeff - CS Representative

  • Mateusz - Customer Education Team Manager
    Mateusz - Customer Education Team Manager

  • Jakub - Customer Education Expert
    Jakub - Customer Education Expert

  • Bogdan - Customer Success Advisor
    Bogdan - Customer Success Advisor

  • Weronika - Customer Success Quality Lead
    Weronika - Customer Success Quality Lead

  • Anna - Customer Success Supervisor
    Anna - Customer Success Supervisor

  • Karolina - Senior Customer Success Advisor
    Karolina - Senior Customer Success Advisor

  • Przemysław - Anti-Abuse Specialist
    Przemysław - Anti-Abuse Specialist

  • Chris - Senior Customer Service Representative
    Chris - Senior Customer Service Representative

  • Yuliia - Customer Success Intern
    Yuliia - Customer Success Intern

  • Ievgeniia - Customer Education Expert
    Ievgeniia - Customer Education Expert

  • Paweł - Customer Success Advisor
    Paweł - Customer Success Advisor

  • Monika - Customer Success Advisor
    Monika - Customer Success Advisor

  • Joanna - Customer Success Advisor
    Joanna - Customer Success Advisor

  • Artiom - Customer Success Intern
    Artiom - Customer Success Intern

  • Spencer - Customer Success Advisor
    Spencer - Customer Success Advisor

  • Maciej - Account Manager
    Maciej - Account Manager

back office

Back office

Potrafimy sprawić, że w GetResponse wszystko działa sprawnie jak w szwajcarskim zegarku.

Wśród nas znajdziesz osoby specjalizujące się w takich dziedzinach jak księgowość, finanse, prawo, zarządzanie biurem oraz HR.

Pracowitość, bystrość, dbałość o szczegóły, otwartość i cała masa pozytywnej energii – to nasze kluczowe atuty. Każdy może zawsze na nas liczyć. Niezależnie od tego co się wydarzy, chętnie podajemy pomocną dłoń i dzielimy się wiedzą.

Jesteśmy dobrzy w tym co robimy i ciągle chcemy być jeszcze lepsi. Dlatego też wykorzystujemy każdą okazję, aby zdobywać nowe umiejętności. Mamy do dyspozycji wewnętrzne i zewnętrzne szkolenia, dostęp do najlepszych narzędzi i publikacji oraz zajęcia językowe.

Wpadnij i przekonaj się, że praca, to dla nas coś więcej niż codzienny obowiązek!

Na pewno Ci się spodoba!

ZESPÓŁ BACKOFFICE:

  • Anita - Office Manager
    Anita - Office Manager

  • Aleksandra - Senior Talent Acquisition Specialist
    Aleksandra - Senior Talent Acquisition Specialist

  • Marta - Talent Acquisition Manager
    Marta - Talent Acquisition Manager

  • Agata - Lawyer
    Agata - Lawyer

  • Joanna - Accountant
    Joanna - Accountant

  • Katarzyna - Accountant Assistant
    Katarzyna - Accountant Assistant

  • Marta - Junior Talent Acquisition Specialist
    Marta - Junior Talent Acquisition Specialist

  • Beata - Accountant
    Beata - Accountant

  • Wioletta - Financial Specialist
    Wioletta - Financial Specialist

  • Sylwia - Accountant
    Sylwia - Accountant

  • Maria - Junior Financial Controller
    Maria - Junior Financial Controller

  • Justyna - Accountant
    Justyna - Accountant

  • Róża - Accountant
    Róża - Accountant

  • Łukasz - Information Security Administrator
    Łukasz - Information Security Administrator

  • Monika - Financial Specialist
    Monika - Financial Specialist

  • Aleksandra - Legal Department Manager
    Aleksandra - Legal Department Manager

  • Monika - Executive Assistant
    Monika - Executive Assistant

  • Anna - Payroll and Personnel Manager
    Anna - Payroll and Personnel Manager

  • Monika - Office Assistant
    Monika - Office Assistant

  • Magdalena - Talent Acquisition & Onboarding Assistant
    Magdalena - Talent Acquisition & Onboarding Assistant

  • Justyna - Accounting Manager (Holding)
    Justyna - Accounting Manager (Holding)

  • Monika - Payroll Specialist
    Monika - Payroll Specialist

  • Monika - Accountant
    Monika - Accountant

  • Joanna - Talent Acquisition Specialist
    Joanna - Talent Acquisition Specialist

  • Aleksandra - Paralegal
    Aleksandra - Paralegal

  • Alicja - Lawyer
    Alicja - Lawyer

  • Magdalena - Acting Office Manager
    Magdalena - Acting Office Manager

  • Michał - Main Health and Safety Manager
    Michał - Main Health and Safety Manager

  • Agnieszka - Financial Controller
    Agnieszka - Financial Controller

  • Tomasz - Lawyer
    Tomasz - Lawyer

  • Monika - Lawyer
    Monika - Lawyer

  • Marta - Director of Finance and Administration
    Marta - Director of Finance and Administration

  • Ewa - Payroll Specialist
    Ewa - Payroll Specialist

  • Justyna - Junior Office Assistant
    Justyna - Junior Office Assistant

  • Paulina - Accountant
    Paulina - Accountant

  • Paulina - Executive Assistant
    Paulina - Executive Assistant

  • Katarzyna - Office Assistant
    Katarzyna - Office Assistant

  • Alicja - Chief Accountant
    Alicja - Chief Accountant

  • Agata - Compensation & Benefits Specialist
    Agata - Compensation & Benefits Specialist

  • Ekaterina -
    Ekaterina