Anton Kharchenko
Summary
3+ years of experience in building massively scalable systems (mostly using C#) both from scratch and diving into an existing codebase. Currently, a software engineer (.NET, Kafka, MS SQL) in the PXP Financial team.
Overview
3
3
years of professional experience
Work History
Software Engineer II
PXP Financial
09.2023 - Current
- Developed diverse financial operations for the project with an annual processing volume of 22.7 billion euros and a platform hosting over 1,000 merchants, the initiative aims to elevate efficiency, scalability, and security within the financial ecosystem
- Enhanced transaction security for purchases by 33% by implementing an extra layer of cardholder verification, utilizing mobile phone verification methods
- Engineered a feature enabling merchants to access and display comprehensive bank identification number information about the cardholder
- Implemented the idempotent behavior of fee calculation for transactions and accelerated the average response time gateway by ~80% (1s to 0.2s) using the implementation of remote request caching
- Optimized the Mastercard type bank identification numbers batch updating process by ~64% (~55s to 20s) via through the implementation of a delta file analyzer, facilitating precise updates within the required ranges.
Software Engineer II
GR8 Tech
01.2023 - 05.2023
- Integrated 12 payment solutions into the system, which facilitated the management of a throughput surpassing 55,000 transactions per second, a daily transaction volume exceeding 2 million, and a user base numbering more than 2.5 million.
Software Engineer
Microinvest
01.2021 - 01.2023
- Took charge of system development, overseeing client documents, invoices, and license management, and integrating data from 24 company products to support a user base of over 100,000 clients
- Reduced the loading time of the monitoring data from the programs by ~70% (~10s to ~3s), saving 2h per 1K client's requests
- Conducted an inquiry into performance-related concerns and effectively reduced the initial page loading time by ~31% (2.6s to 1.8s), resulting in a significant enhancement
- Orchestrated the inception of a new dashboard with statistics about clients, licenses, documents, invoices, and payments that resulted in a notable ~16% (11K to 13K) growth in the daily active clients in the system
- Improved main dashboard loading time by ~90% (~30s to ~3s) for key client's large data sets
- Lifted clients' on-time license payments by ~30% (~57% to ~87%) by utilizing Hangfire to implement background job processing for timely license expiration notifications
- Optimized bulk file upload time by ~80% (~1m to ~10s) through asynchronous processing
- Enhanced data retrieval performance from MSSQL by ~10% (~8s to ~7.2s) via data segmentation into distinct tables, optimizing data loading efficiency
- Proposed and engineered an audit system dashboard, culminating in a noteworthy ~50% (handle 30 to 45 users requests) amplification in the operational efficiency of the support team
- Promoted and successfully implemented Blazor WebAssembly in production, enhancing web application performance and developer productivity while leveraging C# for full-stack development
- Elevated front-end developer productivity by 50% via centralizing communication protocols and streamlined a comprehensive communication framework that boosts connectivity among client apps and a server-side system
- Resolved over 100 production issues of critical priority
- Played a supportive role in the onboarding and mentoring of a select group comprising three developers.
Education
Master's Degree - Computer Science
Kyiv National Economics University
01.2020
Bachelor's Degree - Thermal Engineering
Kryvyi Rih National University
01.2018
Skills
- Azure DevOps
- GitHub
- GitLab
- Confluence
- C#
- SQL
- HTML
- CSS/SCSS
- Javascript
- MS SQL
- Redis
- PostrgresSQL
- CosmosDB
- Code Reviews
- NET Development
- Entity Framework
- Blazor
- SpecFlow
- Docker
- Kafka
- GraphQL
- Software Design
- Microsoft ASPNET
- JIRA
Languages
Ukrainian, Russian
Native language
English
Upper intermediate
B2
Bulgarian
Elementary
A2
Timeline
Software Engineer II
PXP Financial
09.2023 - Current
Software Engineer II
GR8 Tech
01.2023 - 05.2023
Software Engineer
Microinvest
01.2021 - 01.2023
Master's Degree - Computer Science
Kyiv National Economics University
Bachelor's Degree - Thermal Engineering
Kryvyi Rih National University
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