Сергей

Lohvynenko Serhii,
Full Stack .NET Developer
Email: [открыть контакты](см. выше в блоке «контактная информация») Phone/Telegram/Viber/WhatsApp: [открыть контакты](см. выше в блоке «контактная информация»)

Highly skilled Full-Stack .NET Developer with a strong background in developing robust and scalable
applications. Experienced in quickly mastering and implementing new technologies to meet evolving
project requirements. Proficient in both front-end and back-end development, with a focus on delivering
high-quality solutions and optimizing performance. Adept at problem-solving and adapting to fast-paced
environments.

LANGUAGES:

English - Upper-Intermediate (B2) Ukrainian - Native

EDUCATION:

Sep 2016 — Jul 2020 Information Security Bachelor, Kharkiv National University of Radio Electronics

SKILLS:

C# .Net / .Net Core Cloud Logging
Razor / CSHTML Cloud Trace
Angular Okta / OAuth 2.0
TypeScript / JavaScript HomeJunction
HTML / CSS / SCSS Bridge
SQL CloudFlare
Mongo Redis
SignalR Sentry

EMPLOYMENT HISTORY:

Visual Craft May 2023 - Present Day

NDA project, Backend .Net Developer

Conducted analysis and research to provide accurate assessments and estimates for potential tasks.
Integrated Okta for authentication using OAuth2 in the login process.
Integrated Google Cloud Logging for the logging process.
Integrated Google Cloud Trace for distributed tracing and performance monitoring.
Enhanced the functionality of an AI chatbot to support stopping the current message and sending a
new one.
Made minor adjustments to code handling and database structure (MongoDB).
NDA project, Full Stack .Net Developer

Communicated directly with English-speaking clients and presented project demos.
Refactored legacy code to enhance maintainability, improve performance, and streamline
functionality.
Implemented numerous changes and developed new CRUD functionality to enhance application
capabilities.
Implemented Dependency Injection (DI) to improve code modularity and testability.
Integrated with HomeJunction and bridge to streamline data management and enhance application
functionality.
Optimized and improved performance through Redis caching to enhance application speed and
efficiency.
Optimized and improved performance using Cloudflare caching to enhance application speed and
reliability
Configured Razor generators to significantly accelerate the initial page load and first request
performance.
Designed and implemented an inbox feature enabling users to submit documents to the system via
email.
Developed a Python-based solution utilizing AI and PyTesseract for automatic document parsing,
identifying specific fields, and returning the extracted data.
Developed a matching process to identify correlations between documents and other system elements
based on specific document fields, providing users with assignment suggestions.
Implemented logging in Sentry to monitor and track application errors and performance issues.
Converted DataTable.js to a server-side processing model to improve performance and scalability.
Migrated from .NET Framework 4.7.1 to .NET 8, including comprehensive improvements to
architecture at all levels.

Efficiency Leaders (Outsource Development Team) July 2020 — January 2022

NDA Project, Full Stack .Net Developer

Communication and realization of the customer's tasks directly and setting goals.
Developed in a team a vendor document flow control system with a large number of related modules
and logic.
Organization of securitization at all levels of the application, from the user side to the SQL database.
Refactoring of non-optimized or non-working parts of the system, as well as finding and eliminating
bugs.
Development of new modules of the system, closely related to existing ones.
Partially mentoring and code review of less experienced colleagues on the project.
Presentation of my developed functionalities and modules to the customers.
Assisted in implementing customization of the product, allowing the user to customize each line of
each page of each module, setting up permissions for certain roles and users, and adding new entities
to the system.
The developed functionality allowed fine-tuning of all features, processes and accesses for all available
modules, customization of workflows and rules by which these processes run.
Not on the main project:

Correction of errors in small projects.
Learned the experience of communicating with the customer and developing/implementing the
product, from drawing up technical object and technical subject, ending with the implementation of
the end-user website.
Implementation of the domain architecture and deployment of the site on the local server and
hosting.
Had a close collaboration with the designer, thanks to which successfully made a layout of completed
website. Using CSS and HTML with non-third-party frameworks.

Anuitex October 2019 — February 2020

CRM system for internal use, Junior .Net Developer

Successfully completed an internship, during which I was able to competently fulfill almost all the
requirements and develop a website for the sale of books and magazines.
Took part in refactoring obsolete CRM system modules in C#.
Was a part of a team, which worked on optimization and modification of corporate CRM system,
famous examples such as Personio and Rydo.
Developing new parts of the system with a CRUD interface, as well as improving the old ones.
Was developing scheduling module of CRM system that allow user to reserve conference and meeting
rooms.