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Andrii Kostynskyi

@andriikostynskyi

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I’m a customer-focused Key Account Manager who blends client success and data analysis.

Poland

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What I'm looking for

I’m looking for a role in Key Account Management/Customer Success where I can own client relationships, coordinate to resolve issues, and use data analysis to improve retention and service quality.

I’m a customer-focused Key Account Manager with experience in Customer Success, client relationship management, and customer satisfaction. At TelcoGuard, I manage and support key client accounts as the primary point of contact, coordinate with internal teams to resolve issues, and monitor account performance to support retention.

Before that, I strengthened my customer communication and service operations through multi-channel customer roles. I worked with Zendesk, Helpshift, Confluence, and Slack, supporting internal systems and knowledge bases, and contributing to consistently high service quality standards.

I also bring a data and finance mindset to my customer work. As a DataAnalyst Intern at GoIT, I analyzed datasets to support business insights using Microsoft Excel, and earlier in finance I handled general ledger reconciliations, customer payments, VAT reporting, and procurement documentation—so I can stay detail-driven even under pressure.

Experience

Work history, roles, and key accomplishments

Key Account Manager

TelcoGuard

Oct 2023 - Feb 2026 (2 years 4 months)

- Acted as the main point of contact for key clients regarding SMS fraud protection, voice security, flash call prevention, and A2P monetization services.
- Monitored account performance, traffic quality, and commercial KPIs to maximize client satisfaction and business growth (daily target for the biggest clients was around 100k tested SMS).

Data Analyst Intern

GoIT

Jul 2023 - Sep 2023 (2 months)

Analyzed datasets to support business insights using Microsoft Excel and applied analytical thinking to data-driven problem solving.

Microsoft Excel Data Analysis Business Insights Analytical Thinking Reporting Microsoft Office

Customer Service Agent

5CA

Dec 2022 - Sep 2023 (9 months)

- Responded to customer inquiries and supported internal information systems
- Assisted in achieving high customer service ratings
- Worked with Zendesk and Microsoft Teams

Excel English Customer Support Client Relationship Management Account Management Teams Team Management A2P Products

Customer Service Agent

CCIG Group

Oct 2021 - Jul 2024 (2 years 9 months)

- Managed multi-channel customer communication
- Supported internal systems and knowledge bases
- Worked with Zendesk, Helpshift, Confluence, and Slack
- Contributed to maintaining high service quality standards

Excel English Customer Support Client Relationship Management Account Management Teams Team Management A2P Products

OTC / ITC Process Associate

Genpact

Dec 2019 - Dec 2020 (1 year)

- Maintained the general ledger and performed monthly and annual reconciliations
- Conducted monthly customer reconciliations
- Cleared customer payments and managed invoice discrepancies
- Updated pricing and discounts
- Prepared monthly VAT reports

Excel English Customer Support Client Relationship Management Account Management Teams Team Management A2P Products

Education

Degrees, certifications, and relevant coursework

Data Analyst (Student)

Student, Data Analysis

2023 - 2023

Grade: Data Analyst

Activities and societies: - Analyzed datasets and supported business insights using Microsoft Excel - Applied analytical thinking to data-driven problem solving.

Pursuing studies in data analysis starting in July 2023. Program appears to be ongoing.

Vincent Pol University

Master’s Degree, Hospitality and Tourism Management

2017 - 2019

Completed a Master’s degree in Hospitality and Tourism Management from Vincent Pol University in Lublin from October 2017 to July 2019.

National State Tax Service University of Ukraine

Bachelor’s Degree, Accounting and Finance

2011 - 2013

Completed a Bachelor’s degree in Accounting and Finance at the National State Tax Service University of Ukraine in Kamyanets-Podilskyi from September 2011 to June 2013.